# Patent

## Title
Portable contact angle measuring kit

## Abstract

In some embodiments, a system and/or method may include assessing surface cleanliness. In some embodiments, the system may include a dispensing device. The dispensing device may dispense, during use, a measured amount of liquid on a surface forming a drop. In some embodiments, the system may include a stage. The stage may support, during use, a digital imaging device. In some embodiments, the system may include a calibration feature. The calibration feature may be of known dimension. The calibration feature may be coupled to the stage. The calibration feature may facilitate assessment, during use, of a dimension of the drop. The dimension may include a diameter of the drop. In some embodiments, the system is configured to assess a contact angle of the drop with the surface.

## Background
PRIORITY CLAIM
This application claims priority to U.S. Provisional Patent Application No. 62/079,053 entitled “PORTABLE CONTACT ANGLE MEASURING KIT” filed on Nov. 13, 2014, which is incorporated by reference herein.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present disclosure generally relates to assessing surface cleanliness. More particularly, the disclosure generally relates to a portable system and method for measuring a contact angle between a droplet of liquid and a surface.
2. Description of the Relevant Art
There are many instances where a surface must be cleaned sufficiently to permit a following operation to be conducted. For example, a surface that is to be coated (e.g., paint) must first have contaminants (e.g., oil, particulate matter, etc.) removed from the surface so that the coating to be applied will adhere properly to the surface. Proper surface cleanliness is especially important for a smooth metallic surface (e.g., planes, cars, trucks, etc.). Surface irregularities resulting from contamination minimizes coating adhesion through the keying action between the coating film and surface irregularities. Coating adhesion in such cases depends substantially on other adherent mechanisms such as molecular attraction between the metallic surface and the applied coating, and good molecular bonding is achieved only when the surface is properly free of contamination.
The cost of cleaning a surface to be painted increases when the surface being cleaned is part of a large assembled structure. While a surface can be deliberately cleaned beyond the minimum extent necessary for the desired coating adhesion, the expense of such excessive cleaning of the surface is counterproductive.
The measurement of contact angle began in 1805 with the work of Thomas Young. Since then there have been many papers published using contact angle or suggesting new ways to measure contact angle. Almost all of these methods are focused on small samples that may be brought to the lab for analysis in a contact angle measuring device. The field appropriate analyses are mainly the Bikerman method of viewing a drop from above, the Langmuir method of viewing the angle of reflected light from the drop surface, and the drop-shape analysis methods that view the drop from the side. All of these methods have been successfully used in the laboratory. The utility of this method has been revisited recently to show its compatibility and improvement with modern cell phone cameras, macro lenses, and computer spreadsheet programs. But to date, no known source exists that provides the various parts in a self-calibrating contact angle measurement kit that would enable the user to utilize these field-appropriate methods.
SUMMARY
In some embodiments, a system and/or method may include assessing surface cleanliness. In some embodiments, the system may include a dispensing device. The dispensing device may dispense, during use, a measured amount of liquid on a surface forming a drop. In some embodiments, the system may include a stage. The stage may support, during use, a digital imaging device. In some embodiments, the system may include a calibration feature. The calibration feature may be of known dimension. The calibration feature may be coupled to the stage. The calibration feature may facilitate assessment, during use, of a dimension of the drop. The dimension may include a diameter of the drop. In some embodiments, the system is configured to assess a contact angle of the drop with the surface.
In some embodiments, a distance between the stage and the calibration feature may be determined by a focal length of the digital imaging device. The stage may include a macro lens. A distance between the stage and the calibration feature may be determined by a focal length of the macro lens. The stage may include the digital imaging device (e.g., be formed as part of the stage). In some embodiments, a distance between the stage and the calibration feature is adjustable and determined by a focal length of the digital imaging device.
In some embodiments, the digital imaging device comprises a multi-function device (e.g. cellular phone, mini-computer, tablet).
In some embodiments, the system may be configured to assess cleanliness or surface energy of the surface. In some embodiments, the system may be configured to assess a contact angle of the drop with the surface. In some embodiments, the calibration feature may include a tapered edge.
In some embodiments, a method may include assessing surface cleanliness. The method may include dispensing a measured amount of liquid on a surface forming a drop using a dispensing device. The method may include supporting a digital imaging device using a stage. The method may include assessing a dimension of the drop using a calibration feature of known dimension coupled to the stage. The method may include determining a distance between the stage and the calibration feature using a focal length of the digital imaging device. The method may include adjusting a distance between the stage and the calibration feature using a focal length of the digital imaging device. The method may include assessing a contact angle of the drop with the surface. The method may include assessing a cleanliness of the surface.



BRIEF DESCRIPTION OF THE DRAWINGS
Advantages of the present invention may become apparent to those skilled in the art with the benefit of the following detailed description of the preferred embodiments and upon reference to the accompanying drawings.
FIG. 1 depicts a perspective view of a representation of an embodiment of a sessile drop showing the definition of contact angle θ.
FIG. 2 depicts a side view of a representation of an embodiment of a portable system for assessing surface cleanliness including a dispensing device.
FIG. 3 depicts an upper perspective view of a representation of an embodiment of a calibration feature of known dimension.
FIG. 4 depicts a perspective view of a representation of an embodiment of a portable system for assessing surface cleanliness.
FIG. 5 depicts an upper perspective view of a representation of an embodiment of a portable system for assessing surface cleanliness.



While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and may herein be described in detail. The drawings may not be to scale. It should be understood, however, that the drawings and detailed description thereto are not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present invention as defined by the appended claims.
The headings used herein are for organizational purposes only and are not meant to be used to limit the scope of the description. As used throughout this application, the word “may” is used in a permissive sense (i.e., meaning having the potential to), rather than the mandatory sense (i.e., meaning must). The words “include,” “including,” and “includes” indicate open-ended relationships and therefore mean including, but not limited to. Similarly, the words “have,” “having,” and “has” also indicate open-ended relationships, and thus mean having, but not limited to. The terms “first,” “second,” “third,” and so forth as used herein are used as labels for nouns that they precede, and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.) unless such an ordering is otherwise explicitly indicated. For example, a “third die electrically connected to the module substrate” does not preclude scenarios in which a “fourth die electrically connected to the module substrate” is connected prior to the third die, unless otherwise specified. Similarly, a “second” feature does not require that a “first” feature be implemented prior to the “second” feature, unless otherwise specified.
Various components may be described as “configured to” perform a task or tasks. In such contexts, “configured to” is a broad recitation generally meaning “having structure that” performs the task or tasks during operation. As such, the component can be configured to perform the task even when the component is not currently performing that task (e.g., a set of electrical conductors may be configured to electrically connect a module to another module, even when the two modules are not connected). In some contexts, “configured to” may be a broad recitation of structure generally meaning “having circuitry that” performs the task or tasks during operation. As such, the component can be configured to perform the task even when the component is not currently on. In general, the circuitry that forms the structure corresponding to “configured to” may include hardware circuits.
Various components may be described as performing a task or tasks, for convenience in the description. Such descriptions should be interpreted as including the phrase “configured to.” Reciting a component that is configured to perform one or more tasks is expressly intended not to invoke 35 U.S.C. §112 paragraph (f), interpretation for that component.
The scope of the present disclosure includes any feature or combination of features disclosed herein (either explicitly or implicitly), or any generalization thereof, whether or not it mitigates any or all of the problems addressed herein. Accordingly, new claims may be formulated during prosecution of this application (or an application claiming priority thereto) to any such combination of features. In particular, with reference to the appended claims, features from dependent claims may be combined with those of the independent claims and features from respective independent claims may be combined in any appropriate manner and not merely in the specific combinations enumerated in the appended claims.
It is to be understood the present invention is not limited to particular devices or biological systems, which may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting. As used in this specification and the appended claims, the singular forms “a”, “an”, and “the” include singular and plural referents unless the content clearly dictates otherwise. Thus, for example, reference to “a linker” includes one or more linkers.
DETAILED DESCRIPTION
Definitions
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The term “connected” as used herein generally refers to pieces which may be joined or linked together.
The term “coupled” as used herein generally refers to pieces which may be used operatively with each other, or joined or linked together, with or without one or more intervening members.
The term “directly” as used herein generally refers to one structure in physical contact with another structure, or, when used in reference to a procedure, means that one process effects another process or structure without the involvement of an intermediate step or component.
In some embodiments, a system and/or method may include assessing surface cleanliness. In some embodiments, a system may measure a contact angle of a sessile drop. The sessile drop technique is a method used for the characterization of solid surface energies and aspects of liquid surface energies. The main premise of the method is that by placing a droplet of liquid with a known surface energy, the shape of the drop, specifically the contact angle, and the known surface energy of the liquid are the parameters which can be used to calculate the surface energy of the solid sample.
In 1941, Bikerman proposed a novel method of measuring the contact angle of a sessile drop. This was based on viewing the droplet from above and measuring the diameter of the droplet, on known volume. For small volume spherical drops, he derived the equation [1]:

d3/v=(24 sin3θ)/(π(2−3 cos θ+cos3θ))  [1]

Where d is the diameter of the base of the drop, sometimes referred to as the contact diameter, v is the volume of the drop, and θ is the contact angle. FIG. 1 depicts a perspective view of a representation of an embodiment of a sessile drop 100 showing the definition of contact angle θ 110 with a surface 120.

In the Bikerman equation, the term d is the diameter of the droplet base—the circular contact area made by the drop on the surface on which it rests. For contact angles that are less than 90°, where the drop is a hemisphere or less, d is readily measured by viewing the drop from above. However for contact angles greater than 90°, where the drop is greater than hemi-spherical, the maximum girth of the drop will be greater than its contact diameter, such that it will overhang the contact area and obscure it from view. Thus, the Bikerman equation must be modified slightly for use with contact angles>90° such that the waist diameter (w in equation [2]) of the drop is used instead of the base diameter d.

w3/v=24/(π(2−3 cos θ+cos3θ))  [2]

A simple mathematical test identifies situations where the contact angle is less than 90° and where, in consequence the original Bikerman equation [1] or the modified equation [2] can be used with direct overhead viewing. If the measured diameter is greater than the 90°-diameter (d90) (Eq. [3]), then it is valid to use equation [1] otherwise equation [2] should be used.

d90=(12v/π)^1⁄3  [3]

where d90 is the diameter of a hemisphere of volume v. Incorporating this validity test (Eq. [3]), the authors have used computer spreadsheets and cell phone cameras to implement the Bikerman method with minimal cost and analysis time. The availability of computer spreadsheets is perhaps the most important factor in making the Bikerman method more user-friendly. The authors offer a spreadsheet (Tab. 1) that accepts user input of individual volume and diameter values, calculating the contact angle using a lookup-table of the Bikerman equation with 0.10° increments over the range of θ of 0.10° to 179.90°. The spreadsheet applies the test noted above (Eq. [3]), and uses the appropriate version of the Bikerman equation.

The spreadsheet can also be used to generate nomogram sheets (hard copy printouts of the Bikerman equations) for the graphical determination of contact angle. The validity test of equation [3] may be used on this worksheet. Lastly, if the user provides uncertainty values, the spreadsheet will compute the uncertainty in contact angle using equation [4], which was derived using standard propagation of uncertainty techniques.




  
    
      
        
          s
          
            
              d
              3
            
            /
            v
          
        
        =
        
          
            
              d
              3
            
            v
          
          ⁢
          
            
              (
              
                
                  3
                  ⁢
                  
                    
                      (
                      
                        
                          s
                          
                            C
                            px
                          
                        
                        
                          C
                          px
                        
                      
                      )
                    
                    2
                  
                
                +
                
                  3
                  ⁢
                  
                    
                      (
                      
                        
                          s
                          
                            C
                            cm
                          
                        
                        
                          C
                          cm
                        
                      
                      )
                    
                    2
                  
                
                +
                
                  3
                  ⁢
                  
                    
                      (
                      
                        
                          s
                          
                            d
                            px
                          
                        
                        
                          d
                          px
                        
                      
                      )
                    
                    2
                  
                
                +
                
                  
                    (
                    
                      
                        s
                        v
                      
                      v
                    
                    )
                  
                  2
                
              
              )
            
            
              1
              2
            
          
        
      
    
    
      
        [
        4
        ]
      
    
  




Where sd3/v is the uncertainty in the d3/v term, sd is the uncertainty in the diameter measurement (d), and sv is the uncertainty in the drop volume (v). The calibration object (C) is measured in pixels and in cm. The px subscripts in equation [4] indicate an image analysis measurement in pixels. Equation [4] also applies to the modified Bikerman equation [2] if all base diameter d values in equation [4] are substituted with waist diameter w values. The image analysis will be further explained by a description of the various measurement methods.

There are slight differences in the positive and negative uncertainties of contact angle because of the non non-linear nature of the Bikerman equation. To account for this, the uncertainty in contact angle is calculated by looking up the positive and negative deviations separately using the Bikerman lookup-table (Tab. 1).










TABLE 1





w3/ν (unitless)
Θ Lookup (deg)
d3/ν (unitless)
Θ Lookup (deg)


















1.9098593171
179.90
3.8197
90.00


1.9098593172
179.80
3.8297
89.90


1.9098593174
179.70
3.8398
89.80


1.909859318
179.60
3.8498
89.70


1.909859319
179.50
3.8599
89.60


1.909859321
179.40
3.8699
89.50


1.909859325
179.30
3.8800
89.40


1.909859331
179.20
3.8901
89.30


1.90985934
179.10
3.9003
89.20


1.90985935
179.00
3.9104
89.10


1.90985937
178.90
3.9206
89.00


1.90985939
178.80
3.9308
88.90


1.90985941
178.70
3.9410
88.80


1.90985944
178.60
3.9512
88.70


1.90985949
178.50
3.9615
88.60


1.90985953
178.40
3.9717
88.50


1.90985959
178.30
3.9820
88.40


1.90985967
178.20
3.9923
88.30


1.9098597
178.10
4.0026
88.20


1.9098598
178.00
4.0129
88.10


1.9098600
177.90
4.0233
88.00


1.9098601
177.80
4.0336
87.90


1.9098602
177.70
4.0440
87.80


1.9098604
177.60
4.0544
87.70


1.9098606
177.50
4.0649
87.60


1.9098608
177.40
4.0753
87.50


1.9098611
177.30
4.0858
87.40


1.9098614
177.20
4.0962
87.30


1.9098617
177.10
4.1067
87.20


1.9098620
177.00
4.1173
87.10


1.9098624
176.90
4.1278
87.00


1.9098628
176.80
4.1383
86.90


1.9098633
176.70
4.1489
86.80


1.9098638
176.60
4.1595
86.70


1.9098643
176.50
4.1701
86.60


1.9098649
176.40
4.1808
86.50


1.9098655
176.30
4.1914
86.40


1.909866
176.20
4.2021
86.30


1.909867
176.10
4.2128
86.20


1.909868
176.00
4.2235
86.10


1.909869
175.90
4.2342
86.00


1.909870
175.80
4.2449
85.90


1.909871
175.70
4.2557
85.80


1.909872
175.60
4.2665
85.70


1.909873
175.50
4.2773
85.60


1.909874
175.40
4.2881
85.50


1.909875
175.30
4.2990
85.40


1.909877
175.20
4.3098
85.30


1.909878
175.10
4.3207
85.20


1.909880
175.00
4.3316
85.10


1.909882
174.90
4.3426
85.00


1.909884
174.80
4.3535
84.90


1.909885
174.70
4.3645
84.80


1.909887
174.60
4.3755
84.70


1.909890
174.50
4.3865
84.60


1.909892
174.40
4.3975
84.50


1.909894
174.30
4.4085
84.40


1.909897
174.20
4.4196
84.30


1.909899
174.10
4.4307
84.20


1.909902
174.00
4.4418
84.10


1.909905
173.90
4.4529
84.00


1.909908
173.80
4.4641
83.90


1.909911
173.70
4.4753
83.80


1.909915
173.60
4.4864
83.70


1.909918
173.50
4.4977
83.60


1.909922
173.40
4.5089
83.50


1.909926
173.30
4.5201
83.40


1.909930
173.20
4.5314
83.30


1.909934
173.10
4.5427
83.20


1.909939
173.00
4.5540
83.10


1.909943
172.90
4.5654
83.00


1.909948
172.80
4.5767
82.90


1.909953
172.70
4.5881
82.80


1.909958
172.60
4.5995
82.70


1.909964
172.50
4.6109
82.60


1.909970
172.40
4.6224
82.50


1.909975
172.30
4.6339
82.40


1.909982
172.20
4.6454
82.30


1.909988
172.10
4.6569
82.20


1.909995
172.00
4.6684
82.10


1.910001
171.90
4.6800
82.00


1.910009
171.80
4.6915
81.90


1.910016
171.70
4.7031
81.80


1.910024
171.60
4.7148
81.70


1.910032
171.50
4.7264
81.60


1.910040
171.40
4.7381
81.50


1.910048
171.30
4.7498
81.40


1.91006
171.20
4.7615
81.30


1.91007
171.10
4.7732
81.20


1.91008
171.00
4.7850
81.10


1.91009
170.90
4.7968
81.00


1.91010
170.80
4.8086
80.90


1.91011
170.70
4.8204
80.80


1.91012
170.60
4.8322
80.70


1.91013
170.50
4.8441
80.60


1.91014
170.40
4.8560
80.50


1.91015
170.30
4.8679
80.40


1.91016
170.20
4.8799
80.30


1.91018
170.10
4.8918
80.20


1.91019
170.00
4.9038
80.10


1.91020
169.90
4.9158
80.00


1.91022
169.80
4.9279
79.90


1.91023
169.70
4.9399
79.80


1.91024
169.60
4.9520
79.70


1.91026
169.50
4.9641
79.60


1.91027
169.40
4.9762
79.50


1.91029
169.30
4.9884
79.40


1.91031
169.20
5.0006
79.30


1.91032
169.10
5.0128
79.20


1.91034
169.00
5.0250
79.10


1.91036
168.90
5.0373
79.00


1.91038
168.80
5.0495
78.90


1.91039
168.70
5.0618
78.80


1.91041
168.60
5.0742
78.70


1.91043
168.50
5.0865
78.60


1.91045
168.40
5.0989
78.50


1.91047
168.30
5.1113
78.40


1.91049
168.20
5.1237
78.30


1.91052
168.10
5.1362
78.20


1.91054
168.00
5.1486
78.10


1.91056
167.90
5.1611
78.00


1.91058
167.80
5.1737
77.90


1.91061
167.70
5.1862
77.80


1.91063
167.60
5.1988
77.70


1.91066
167.50
5.2114
77.60


1.91068
167.40
5.2240
77.50


1.91071
167.30
5.2367
77.40


1.91074
167.20
5.2494
77.30


1.91076
167.10
5.2621
77.20


1.91079
167.00
5.2748
77.10


1.91082
166.90
5.2875
77.00


1.91085
166.80
5.3003
76.90


1.91088
166.70
5.3131
76.80


1.91091
166.60
5.3260
76.70


1.91094
166.50
5.3388
76.60


1.91098
166.40
5.3517
76.50


1.91101
166.30
5.3646
76.40


1.91104
166.20
5.3776
76.30


1.91108
166.10
5.3906
76.20


1.91111
166.00
5.4036
76.10


1.91115
165.90
5.4166
76.00


1.91118
165.80
5.4296
75.90


1.91122
165.70
5.4427
75.80


1.91126
165.60
5.4558
75.70


1.91130
165.50
5.4690
75.60


1.91134
165.40
5.4821
75.50


1.91138
165.30
5.4953
75.40


1.91142
165.20
5.5085
75.30


1.91146
165.10
5.5218
75.20


1.91150
165.00
5.5350
75.10


1.91155
164.90
5.5483
75.00


1.91159
164.80
5.5617
74.90


1.91164
164.70
5.5750
74.80


1.91169
164.60
5.5884
74.70


1.91173
164.50
5.6018
74.60


1.91178
164.40
5.6153
74.50


1.91183
164.30
5.6287
74.40


1.91188
164.20
5.6422
74.30


1.91193
164.10
5.6558
74.20


1.91198
164.00
5.6693
74.10


1.91204
163.90
5.6829
74.00


1.91209
163.80
5.6965
73.90


1.91215
163.70
5.7102
73.80


1.91220
163.60
5.7239
73.70


1.91226
163.50
5.7376
73.60


1.91232
163.40
5.7513
73.50


1.91237
163.30
5.7651
73.40


1.91243
163.20
5.7789
73.30


1.91250
163.10
5.7927
73.20


1.91256
163.00
5.8065
73.10


1.91262
162.90
5.8204
73.00


1.91269
162.80
5.8343
72.90


1.91275
162.70
5.8483
72.80


1.91282
162.60
5.8623
72.70


1.91289
162.50
5.8763
72.60


1.91295
162.40
5.8903
72.50


1.91302
162.30
5.9044
72.40


1.91309
162.20
5.9185
72.30


1.91317
162.10
5.9326
72.20


1.91324
162.00
5.9468
72.10


1.91332
161.90
5.9610
72.00


1.91339
161.80
5.9752
71.90


1.91347
161.70
5.9895
71.80


1.91355
161.60
6.0038
71.70


1.91363
161.50
6.0181
71.60


1.91371
161.40
6.0325
71.50


1.91379
161.30
6.0468
71.40


1.91387
161.20
6.0613
71.30


1.91396
161.10
6.0757
71.20


1.91404
161.00
6.0902
71.10


1.9141
160.90
6.1047
71.00


1.9142
160.80
6.1193
70.90


1.9143
160.70
6.1339
70.80


1.9144
160.60
6.1485
70.70


1.9145
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1.9146
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1.9147
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1.9148
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1.9149
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1.9150
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1.9151
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1.9152
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1.9153
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1.9154
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1.9156
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1.9157
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1.9158
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1.9159
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1.9161
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1.9162
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1.9163
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1.9165
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1.9170
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1.9173
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1.9176
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1.9177
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1.9178
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1.9180
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1.9181
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1.9183
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1.9184
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1.9186
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1.9187
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1.9189
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1.9190
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1.9192
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1.9193
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1.9195
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1.9196
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1.9198
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1.9200
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1.9203
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1.9217
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1.9221
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1.9223
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1.9225
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1.9227
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1.9229
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1.9231
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1.9233
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1.9235
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1.9237
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1.9239
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1.9241
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1.9244
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1.9246
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1.9248
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1.9250
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1.9252
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1.9255
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1.9257
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1.9259
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1.9262
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1.9264
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1.9266
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1.9269
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1.9271
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1.9274
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1.9276
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1.9279
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1.9281
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1.9284
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1.9286
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1.9289
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1.9292
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1.9294
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1.9297
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1.9300
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1.9303
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1.9305
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1.9308
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1.9311
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1.9314
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1.9317
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1.9320
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1.9323
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1.9326
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1.9329
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1.9332
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1.9335
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1.9341
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1.9344
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1.9347
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1.9351
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1.9354
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1.9357
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1.9360
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1.9364
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1.9367
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1.9371
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1.9374
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1.9378
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1.9381
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1.9385
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1.9388
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1.9392
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1.9395
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1.9399
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1.9403
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1.9406
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1.9410
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1.9414
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1.9418
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1.9422
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1.9426
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1.9430
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1.9433
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1.9437
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1.9442
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1.9446
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1.9450
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1.9454
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1.9458
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1.9462
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1.9466
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1.9471
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1.9475
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1.9479
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1.9484
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1.9488
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1.9493
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1.9497
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1.9502
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1.9506
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1.9511
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1.9516
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1.9520
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1.9525
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1.9530
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1.9535
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1.9539
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1.9544
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1.9549
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1.9554
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1.9559
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1.9564
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1.9569
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1.9574
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1.9580
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1.9585
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1.9590
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1.9595
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1.9601
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1.9606
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1.9611
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1.9617
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1.9622
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1.9628
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1.9633
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1.9639
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1.9645
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1.9650
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1.9656
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1.9662
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1.9668
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1.9674
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1.9680
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1.9686
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1.9692
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1.9698
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1.9704
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1.9710
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1.9716
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1.9722
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1.9729
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1.9735
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1.9741
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1.9748
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1.9754
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1.9761
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1.9767
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1.9774
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1.9781
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1.9808
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1.9815
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1.9822
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1.9836
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1.9850
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1.9857
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1.9864
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1.9872
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1.9879
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1.9886
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1.9894
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1.9924
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1.9932
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1.9940
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1.9947
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1.9955
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1.9963
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1.9987
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1.9995
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2.0004
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2.0012
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2.0020
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2.0029
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2.0037
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2.0045
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2.0097
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2.0115
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2.0124
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2.0142
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2.0161
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2.0170
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2.0179
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2.0198
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2.0208
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2.0227
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2.0236
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2.0256
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2.0266
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2.0276
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2.0286
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2.0296
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2.0306
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2.0316
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2.0326
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2.0337
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2.0347
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2.0357
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2.0368
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2.0379
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2.0389
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2.0400
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2.0411
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2.0421
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2.0432
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2.0443
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2.0454
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2.0465
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2.0477
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2.0488
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2.0499
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2.0510
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2.0522
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2.0533
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2.0545
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2.0556
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2.0568
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2.0580
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2.0592
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2.0604
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2.0616
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2.0628
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2.0640
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2.0652
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2.0664
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2.0677
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2.0689
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2.0702
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2.0714
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2.0727
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2.0739
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2.0752
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2.0765
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2.0778
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2.0791
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2.0804
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2.0817
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2.0830
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2.0844
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2.0857
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2.0870
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2.0884
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2.0897
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2.0911
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2.0925
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2.0939
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2.0953
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2.0967
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2.0981
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2.0995
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2.1009
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2.1023
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2.1038
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2.1052
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2.1067
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2.1081
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2.1096
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2.1111
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2.1126
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2.1141
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2.1156
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2.1171
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2.1186
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2.1201
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2.1217
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2.1232
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2.1248
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2.1263
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2.1279
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2.1295
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2.1311
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2.1327
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2.1343
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2.1359
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2.1375
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2.1391
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2.1408
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2.1424
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2.1441
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2.1457
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2.1474
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2.1491
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2.1508
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2.1525
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2.1542
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2.1559
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2.1577
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2.1594
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2.1611
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2.1629
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2.1647
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15.6347
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2.1664
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15.6855
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2.1682
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2.1700
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2.1718
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2.1736
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2.1755
124.30
15.9434
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2.1773
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2.1791
124.10
16.0486
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2.1810
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2.1829
123.90
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2.1847
123.80
16.2086
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2.1866
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16.2625
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2.1885
123.60
16.3167
33.70


2.1904
123.50
16.3713
33.60


2.1923
123.40
16.4261
33.50


2.1942
123.30
16.4812
33.40


2.1962
123.20
16.5367
33.30


2.1981
123.10
16.5925
33.20


2.2001
123.00
16.6485
33.10


2.2020
122.90
16.7050
33.00


2.2040
122.80
16.7617
32.90


2.2060
122.70
16.8188
32.80


2.2080
122.60
16.8762
32.70


2.2100
122.50
16.9339
32.60


2.2120
122.40
16.9920
32.50


2.2140
122.30
17.0504
32.40


2.2161
122.20
17.1091
32.30


2.2181
122.10
17.1682
32.20


2.2202
122.00
17.2276
32.10


2.2222
121.90
17.2874
32.00


2.2243
121.80
17.3476
31.90


2.2264
121.70
17.4081
31.80


2.2285
121.60
17.4690
31.70


2.2306
121.50
17.5302
31.60


2.2327
121.40
17.5918
31.50


2.2348
121.30
17.6538
31.40


2.2370
121.20
17.7162
31.30


2.2391
121.10
17.7789
31.20


2.2413
121.00
17.8421
31.10


2.2435
120.90
17.9056
31.00


2.2457
120.80
17.9695
30.90


2.2478
120.70
18.0338
30.80


2.2501
120.60
18.0985
30.70


2.2523
120.50
18.1636
30.60


2.2545
120.40
18.2291
30.50


2.2567
120.30
18.2950
30.40


2.2590
120.20
18.3614
30.30


2.2613
120.10
18.4281
30.20


2.2635
120.00
18.4953
30.10


2.2658
119.90
18.5629
30.00


2.2681
119.80
18.6310
29.90


2.2704
119.70
18.6994
29.80


2.2728
119.60
18.7684
29.70


2.2751
119.50
18.8377
29.60


2.2774
119.40
18.9075
29.50


2.2798
119.30
18.9778
29.40


2.2822
119.20
19.0485
29.30


2.2845
119.10
19.1197
29.20


2.2869
119.00
19.1914
29.10


2.2893
118.90
19.2635
29.00


2.2917
118.80
19.3362
28.90


2.2942
118.70
19.4093
28.80


2.2966
118.60
19.4828
28.70


2.2991
118.50
19.5569
28.60


2.3015
118.40
19.6315
28.50


2.3040
118.30
19.7066
28.40


2.3065
118.20
19.7822
28.30


2.3090
118.10
19.8583
28.20


2.3115
118.00
19.9349
28.10


2.3140
117.90
20.0121
28.00


2.3166
117.80
20.0897
27.90


2.3191
117.70
20.1680
27.80


2.3217
117.60
20.2467
27.70


2.3243
117.50
20.3260
27.60


2.3269
117.40
20.4059
27.50


2.3295
117.30
20.4863
27.40


2.3321
117.20
20.5673
27.30


2.3347
117.10
20.6489
27.20


2.3374
117.00
20.7311
27.10


2.3400
116.90
20.8138
27.00


2.3427
116.80
20.8971
26.90


2.3454
116.70
20.9811
26.80


2.3481
116.60
21.0656
26.70


2.3508
116.50
21.1508
26.60


2.3535
116.40
21.2365
26.50


2.3562
116.30
21.3229
26.40


2.3590
116.20
21.4100
26.30


2.3617
116.10
21.4976
26.20


2.3645
116.00
21.5860
26.10


2.3673
115.90
21.6749
26.00


2.3701
115.80
21.7646
25.90


2.3729
115.70
21.8549
25.80


2.3758
115.60
21.9459
25.70


2.3786
115.50
22.0376
25.60


2.3815
115.40
22.1299
25.50


2.3843
115.30
22.2230
25.40


2.3872
115.20
22.3168
25.30


2.3901
115.10
22.4113
25.20


2.3930
115.00
22.5066
25.10


2.3960
114.90
22.6026
25.00


2.3989
114.80
22.6993
24.90


2.4019
114.70
22.7968
24.80


2.4048
114.60
22.8950
24.70


2.4078
114.50
22.9940
24.60


2.4108
114.40
23.0938
24.50


2.4138
114.30
23.1945
24.40


2.4169
114.20
23.2959
24.30


2.4199
114.10
23.3981
24.20


2.4230
114.00
23.5011
24.10


2.4260
113.90
23.6050
24.00


2.4291
113.80
23.7097
23.90


2.4322
113.70
23.8153
23.80


2.4354
113.60
23.9217
23.70


2.4385
113.50
24.0290
23.60


2.4416
113.40
24.1372
23.50


2.4448
113.30
24.2464
23.40


2.4480
113.20
24.3564
23.30


2.4512
113.10
24.4673
23.20


2.4544
113.00
24.5792
23.10


2.4576
112.90
24.6920
23.00


2.4609
112.80
24.8058
22.90


2.4641
112.70
24.9205
22.80


2.4674
112.60
25.0363
22.70


2.4707
112.50
25.1530
22.60


2.4740
112.40
25.2707
22.50


2.4773
112.30
25.3895
22.40


2.4807
112.20
25.5093
22.30


2.4840
112.10
25.6302
22.20


2.4874
112.00
25.7521
22.10


2.4908
111.90
25.8751
22.00


2.4942
111.80
25.9992
21.90


2.4976
111.70
26.1244
21.80


2.5011
111.60
26.2508
21.70


2.5045
111.50
26.3783
21.60


2.5080
111.40
26.5069
21.50


2.5115
111.30
26.6367
21.40


2.5150
111.20
26.7677
21.30


2.5185
111.10
26.8999
21.20


2.5220
111.00
27.0334
21.10


2.5256
110.90
27.1681
21.00


2.5292
110.80
27.3040
20.90


2.5328
110.70
27.4412
20.80


2.5364
110.60
27.5797
20.70


2.5400
110.50
27.7196
20.60


2.5436
110.40
27.8608
20.50


2.5473
110.30
28.0033
20.40


2.5510
110.20
28.1472
20.30


2.5547
110.10
28.2925
20.20


2.5584
110.00
28.4392
20.10


2.5621
109.90
28.5873
20.00


2.5659
109.80
28.7369
19.90


2.5696
109.70
28.8880
19.80


2.5734
109.60
29.0406
19.70


2.5772
109.50
29.1947
19.60


2.5810
109.40
29.3504
19.50


2.5849
109.30
29.5076
19.40


2.5887
109.20
29.6665
19.30


2.5926
109.10
29.8270
19.20


2.5965
109.00
29.9891
19.10


2.6004
108.90
30.1529
19.00


2.6044
108.80
30.3183
18.90


2.6083
108.70
30.4856
18.80


2.6123
108.60
30.6545
18.70


2.6163
108.50
30.8253
18.60


2.6203
108.40
30.9979
18.50


2.6243
108.30
31.1723
18.40


2.6284
108.20
31.3486
18.30


2.6324
108.10
31.5268
18.20


2.6365
108.00
31.7069
18.10


2.6406
107.90
31.8890
18.00


2.6448
107.80
32.0731
17.90


2.6489
107.70
32.2593
17.80


2.6531
107.60
32.4475
17.70


2.6573
107.50
32.6378
17.60


2.6615
107.40
32.8302
17.50


2.6657
107.30
33.0249
17.40


2.6699
107.20
33.2217
17.30


2.6742
107.10
33.4208
17.20


2.6785
107.00
33.6222
17.10


2.6828
106.90
33.8259
17.00


2.6872
106.80
34.0320
16.90


2.6915
106.70
34.2406
16.80


2.6959
106.60
34.4516
16.70


2.7003
106.50
34.6650
16.60


2.7047
106.40
34.8811
16.50


2.7091
106.30
35.0997
16.40


2.7136
106.20
35.3210
16.30


2.7181
106.10
35.5450
16.20


2.7226
106.00
35.7717
16.10


2.7271
105.90
36.0013
16.00


2.7316
105.80
36.2336
15.90


2.7362
105.70
36.4689
15.80


2.7408
105.60
36.7071
15.70


2.7454
105.50
36.9484
15.60


2.7500
105.40
37.1927
15.50


2.7547
105.30
37.4402
15.40


2.7594
105.20
37.6908
15.30


2.7641
105.10
37.9448
15.20


2.7688
105.00
38.2020
15.10


2.7735
104.90
38.4626
15.00


2.7783
104.80
38.7267
14.90


2.7831
104.70
38.9944
14.80


2.7879
104.60
39.2656
14.70


2.7928
104.50
39.5405
14.60


2.7976
104.40
39.8191
14.50


2.8025
104.30
40.1016
14.40


2.8074
104.20
40.3880
14.30


2.8124
104.10
40.6783
14.20


2.8173
104.00
40.9728
14.10


2.8223
103.90
41.2714
14.00


2.8273
103.80
41.5743
13.90


2.8323
103.70
41.8815
13.80


2.8374
103.60
42.1932
13.70


2.8425
103.50
42.5094
13.60


2.8476
103.40
42.8302
13.50


2.8527
103.30
43.1558
13.40


2.8578
103.20
43.4862
13.30


2.8630
103.10
43.8216
13.20


2.8682
103.00
44.1621
13.10


2.8735
102.90
44.5077
13.00


2.8787
102.80
44.8587
12.90


2.8840
102.70
45.2151
12.80


2.8893
102.60
45.5771
12.70


2.8946
102.50
45.9448
12.60


2.9000
102.40
46.3183
12.50


2.9054
102.30
46.6978
12.40


2.9108
102.20
47.0834
12.30


2.9162
102.10
47.4753
12.20


2.9217
102.00
47.8736
12.10


2.9272
101.90
48.2785
12.00


2.9327
101.80
48.6901
11.90


2.9382
101.70
49.1087
11.80


2.9438
101.60
49.5344
11.70


2.9494
101.50
49.9674
11.60


2.9550
101.40
50.4078
11.50


2.9607
101.30
50.8560
11.40


2.9663
101.20
51.3120
11.30


2.9720
101.10
51.7761
11.20


2.9778
101.00
52.2485
11.10


2.9835
100.90
52.7294
11.00


2.9893
100.80
53.2191
10.90


2.9952
100.70
53.7179
10.80


3.0010
100.60
54.2259
10.70


3.0069
100.50
54.7434
10.60


3.0128
100.40
55.2707
10.50


3.0187
100.30
55.8081
10.40


3.0247
100.20
56.3559
10.30


3.0307
100.10
56.9144
10.20


3.0367
100.00
57.4838
10.10


3.0427
99.90
58.0646
10.00


3.0488
99.80
58.6571
9.90


3.0549
99.70
59.2616
9.80


3.0611
99.60
59.8785
9.70


3.0673
99.50
60.5082
9.60


3.0735
99.40
61.1511
9.50


3.0797
99.30
61.8076
9.40


3.0859
99.20
62.4781
9.30


3.0922
99.10
63.1632
9.20


3.0986
99.00
63.8633
9.10


3.1049
98.90
64.5788
9.00


3.1113
98.80
65.3104
8.90


3.1177
98.70
66.0585
8.80


3.1242
98.60
66.8238
8.70


3.1307
98.50
67.6068
8.60


3.1372
98.40
68.4081
8.50


3.1437
98.30
69.2284
8.40


3.1503
98.20
70.0685
8.30


3.1569
98.10
70.9289
8.20


3.1636
98.00
71.8106
8.10


3.1702
97.90
72.7142
8.00


3.1769
97.80
73.6406
7.90


3.1837
97.70
74.5907
7.80


3.1905
97.60
75.5653
7.70


3.1973
97.50
76.5656
7.60


3.2041
97.40
77.5924
7.50


3.2110
97.30
78.6469
7.40


3.2179
97.20
79.7303
7.30


3.2249
97.10
80.8436
7.20


3.2318
97.00
81.9882
7.10


3.2389
96.90
83.1654
7.00


3.2459
96.80
84.3767
6.90


3.2530
96.70
85.6235
6.80


3.2601
96.60
86.9074
6.70


3.2673
96.50
88.2302
6.60


3.2745
96.40
89.5935
6.50


3.2817
96.30
90.9994
6.40


3.2890
96.20
92.4498
6.30


3.2963
96.10
93.9469
6.20


3.3036
96.00
95.4930
6.10


3.3110
95.90
97.0905
6.00


3.3184
95.80
98.7421
5.90


3.3259
95.70
100.4506
5.80


3.3334
95.60
102.2188
5.70


3.3409
95.50
104.0501
5.60


3.3484
95.40
105.9479
5.50


3.3560
95.30
107.9159
5.40


3.3637
95.20
109.9580
5.30


3.3714
95.10
112.0786
5.20


3.3791
95.00
114.2822
5.10


3.3868
94.90
116.5738
5.00


3.3946
94.80
118.9589
4.90


3.4025
94.70
121.4432
4.80


3.4103
94.60
124.0331
4.70


3.4183
94.50
126.7354
4.60


3.4262
94.40
129.5578
4.50


3.4342
94.30
132.5083
4.40


3.4422
94.20
135.5958
4.30


3.4503
94.10
138.8303
4.20


3.4584
94.00
142.2224
4.10


3.4666
93.90
145.7840
4.00


3.4748
93.80
149.5280
3.90


3.4830
93.70
153.4690
3.80


3.4913
93.60
157.6228
3.70


3.4996
93.50
162.0072
3.60


3.5080
93.40
166.6420
3.50


3.5164
93.30
171.5493
3.40


3.5249
93.20
176.7537
3.30


3.5334
93.10
182.2833
3.20


3.5419
93.00
188.1694
3.10


3.5505
92.90
194.4478
3.00


3.5591
92.80
201.1589
2.90


3.5678
92.70
208.3492
2.80


3.5765
92.60
216.0719
2.70


3.5853
92.50
224.3884
2.60


3.5941
92.40
233.3699
2.50


3.6029
92.30
243.0997
2.40


3.6118
92.20
253.6753
2.30


3.6208
92.10
265.2121
2.20


3.6298
92.00
277.8473
2.10


3.6388
91.90
291.7457
2.00


3.6479
91.80
307.1069
1.90


3.6570
91.70
324.1745
1.80


3.6662
91.60
343.2496
1.70


3.6754
91.50
364.7089
1.60


3.6847
91.40
389.0289
1.50


3.6940
91.30
416.8228
1.40


3.7034
91.20
448.8923
1.30


3.7128
91.10
486.3061
1.20


3.7223
91.00
530.5220
1.10


3.7318
90.90
583.5804
1.00


3.7414
90.80
648.4289
0.90


3.7510
90.70
729.4888
0.80


3.7606
90.60
833.7078
0.70


3.7704
90.50
972.6656
0.60


3.7801
90.40
1167.2053
0.50


3.7900
90.30
1459.0131
0.40


3.7998
90.20
1945.3586
0.30


3.8097
90.10
2918.0404
0.20


3.8197
90.00
5836.2355
0.10









In some embodiments, a software program or application may assess the contact angle. Software may assess if the measured diameter is greater than the 90°-diameter (d90) (Eq. [3]). If the measured diameter is greater than the 90°-diameter (d90) (Eq. [3]), then it is valid to use the Bikerman equation [1]. If the measured diameter is less than d90 a modified Bikerman equation [2] may be used, wherein the diameter of the widest portion of the drop is used instead of the base (or contact) diameter of the drop. In some embodiments a spreadsheet or dedicated software program may be employed to determine the contact angle using either equation [1] or equation [2] as determined to be valid via equation [3]. In some embodiments, a spreadsheet or software program may utilize a lookup-table (Tab. 1) of the Bikerman equation with 0.1° increments over the range of θ of 0.1° to 179.9° to return the contact angle value that matches the experimentally measured d3/v ratio.
FIG. 2 depicts a side view of a representation of an embodiment of a portable system 200 for assessing surface cleanliness. In some embodiments, the system 200 may include a dispensing device 210. The dispensing device may dispense, during use, a measured amount of liquid on a surface forming a drop 110. In some embodiments, the dispensing device may include an accurate device. In some embodiments, the dispensing device may include a pump.
In some embodiments, the dispensing device 210 may include a syringe. A syringe may include a simple pump consisting of a plunger 210a that fits tightly in a tube 210b. The plunger may be pulled and pushed along an inside of a cylindrical tube, allowing the syringe to take in and expel fluids through an orifice at the open end of the tube. The open end of the syringe may be fitted with a hypodermic needle 210c, a nozzle, or tubing to help direct the flow into and out of the barrel.
In some embodiments, the dispensing device may include a stand 220. The stand may function to stabilize the dispensing device during use. The stand may allow a user to more accurately dispense a droplet onto a surface.
In some embodiments, the dispensing device may have a relative uncertainty of less than 5%. In some embodiments, the dispensing device may have a relative uncertainty of less than 2%. Relative uncertainty is calculated as the standard deviation divided by the mean value. This is also known as the relative standard deviation (RSD) in percent. Others call this the coefficient of variation (CV).
In some embodiments, the system 200 may include a stage 230. The stage may support, during use, a digital imaging device 240. In some embodiments, the stage is coupled to the digital imaging device. In some embodiments, the system may include a calibration feature 250. The calibration feature may be of known dimension. The calibration feature may be coupled to the stage. The calibration feature may facilitate assessment, during use, of a dimension of the drop 110. The dimension may include a diameter of the drop. In some embodiments, the system is configured to assess a contact angle of the drop with the surface 120. FIG. 3 depicts an upper perspective view of a representation of an embodiment of a calibration feature 250 of known dimension in the form of a circular tapered opening surrounding the drop 110.
One or more dimensions of the calibration feature may be known. The known dimension may be used to assess one or more dimensions of the drop. The known dimension may be correlated to pixels from a digital image taken from the digital imaging device such that a dimension of the drop may be assessed by determining the number of pixels in the image associated with the dimension.
In some embodiments, the calibration feature may include a tapered edge 250a. A tapered edge may inhibit parallax. Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between the two lines. Parallax affects optical instruments such as rifle scopes, binoculars, microscopes, and twin-lens reflex cameras that view objects from slightly different angles.
FIGS. 4-5 depict perspective views of a representation of an embodiment of a portable system 200 for assessing surface cleanliness. In some embodiments, a distance between the stage and the calibration feature is determined by a focal length of the digital imaging device. This allows the drop and the calibration feature to be in focus. In some embodiments, a distance between the stage and the calibration feature is adjustable and determined by a focal length of the digital imaging device. A system for adjusting the distance may include systems which allow for incremental adjustment of the distance. In some embodiments, the system for distance adjustment may include threaded elongated members coupling the stage to the calibration feature. In some embodiments, the system for distance adjustment may include a ratcheting system coupling the stage to the calibration feature.
In some embodiments, the digital imaging device comprises a lens. The lens may include a macro or similar lens. A macro lens may allow the digital imaging device to focus on the drop and/or calibration feature.
In some embodiments, the stage includes a lens 260 (e.g., as depicted in FIG. 2) incorporated into the stage. The lens in the stage may function in combination with the digital imaging device. A distance between the stage and the calibration feature is determined by a focal length of the macro lens. In some embodiments, the stage includes the digital imaging device such that the stage and digital imaging device are one unit.
In some embodiments, the digital imaging device may include a digital camera. The digital image may include an electronic device which includes a digital camera (e.g., cellular phones, tablets, etc.).
In this patent, certain U.S. patents, U.S. patent applications, and other materials (e.g., articles) have been incorporated by reference. The text of such U.S. patents, U.S. patent applications, and other materials is, however, only incorporated by reference to the extent that no conflict exists between such text and the other statements and drawings set forth herein. In the event of such conflict, then any such conflicting text in such incorporated by reference U.S. patents, U.S. patent applications, and other materials is specifically not incorporated by reference in this patent.
Further modifications and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art in view of this description. Accordingly, this description is to be construed as illustrative only and is for the purpose of teaching those skilled in the art the general manner of carrying out the invention. It is to be understood that the forms of the invention shown and described herein are to be taken as the presently preferred embodiments. Elements and materials may be substituted for those illustrated and described herein, parts and processes may be reversed, and certain features of the invention may be utilized independently, all as would be apparent to one skilled in the art after having the benefit of this description of the invention. Changes may be made in the elements described herein without departing from the spirit and scope of the invention as described in the following claims.

## Claims

1. A support for use during the measurement of physical properties of a drop of water on a surface, comprising:
a stage which is capable of supporting, during measurement of the physical properties of the drop of water, a digital imaging device;
a calibration feature of known dimension coupled to the stage, wherein the calibration feature is in the form of a circular opening; and wherein the calibration feature is positionable over the drop of liquid placed on the surface such that the calibration feature surrounds the drop of liquid;
wherein, during use, a digital imaging device coupled to the stage is positioned by the stage such that the digital imaging device can, simultaneously, obtain an image of the drop of water and the calibration feature.

2. The support of claim 1, wherein a distance between the stage and the calibration feature is predetermined based on a focal length of the digital imaging device.

3. The support of claim 1, wherein a distance between the stage and the calibration feature is adjustable such that the distance can be set based on a focal length of the digital imaging device.

4. The support of claim 1, wherein the stage comprises a macro lens.

5. The support of claim 1, wherein the stage comprises a macro lens, and wherein a distance between the stage and the calibration feature is determined by a focal length of the macro lens.

6. The support of claim 1, wherein the digital imaging device comprises a multi-function device.

7. The support of claim 1, wherein the known dimension comprises a diameter of the circular opening.

8. The support of claim 1, wherein the circular opening of the calibration feature comprises a tapered edge.

9. A method of assessing surface cleanliness, comprising:
dispensing a measured amount of liquid on a surface forming a drop using a dispensing device;
placing a portable system for assessing surface cleanliness or surface energy over the drop, the portable system comprising:
a stage which is capable of supporting a digital imaging device; and
a calibration feature of known dimension coupled to the stage, wherein the calibration feature is in the form of a circular opening;

positioning the portable system over the drop such that the calibration feature surrounds the drop; and
capturing an image of the drop and the calibration feature.

10. The method of claim 9, further comprising determining a distance between the stage and the calibration feature using a focal length of the digital imaging device.

11. The method of claim 9, further comprising adjusting a distance between the stage and the calibration feature using a focal length of the digital imaging device.

12. The method of claim 9, further comprising assessing a contact angle of the drop with the surface using the captured image of the drop and the calibration feature.

13. The method of claim 12, further comprising assessing a cleanliness of the surface using the assessed contact angle.

14. The method of claim 9, wherein the stage comprises a macro lens.

15. The method of claim 9, wherein the known dimension comprises a diameter of the circular opening.

16. The method of claim 9, wherein the circular opening of the calibration feature comprises a tapered edge.