Search query: measurement of powder wettability

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abstract: Abstract In the present work, size tunable ZnS scotch tape nanocomposite materials were successfully prepared using SILAR method. Scanning electron microscopy (SEM) Atomic Force Microscopy (AFM) X ray powder diffraction (XRD) and Brunauer Emmett Teller (BET) porosity measuring techniques were used for morphological, structural and porosity determination of the prepared nanocomposite materials. UV Visible absorption and Fourier Transform infrared (FTIR) spectroscopy techniques were used for investigation of optical properties of the prepared nanocomposite. The confinement of electrons and holes in semiconductor nanostructured materials in lower cycles of SILAR depicts a blue shift in the band gap, which obtained by UV Visible absorption spectra and described by Effective Mass Approximation (EMA) and Hyperbolic Band Model (HBM) In higher cycles of SILAR, with increasing in particles sizes, a red shift was observed at the position of the peak in the absorption spectrum and consequently optical band gap decreases. Wettability measurement of ZnS scotch tape nanocomposite materials was investigated by contact angle measurement of water drop on the surface. BET results show a various and alternative behavior. At initial cycles of SILAR, the special surfaces are decreases by increasing cycles of SILAR until 4 cycles, then after 4 cycles of SILAR, the special surfaces are increased with increasing cycles of SILAR, until 12 cycles, then, the special surfaces have decreased with increasing cycles until 16 cycles of SILAR.
author_names: Javid Farazin

Gholamreza Pirgholi-Givi

Yashar Azizian-Kalandaragh
title: Wettability measurement, optical characteristics, and investigation of the quantum confinement effect of ZnS scotch tape nanocomposite films prepared by successive ionic layer adsorption and reaction (SILAR) method
venue: Physica B: Condensed Matter
year: 2019

abstract: Abstract Washburn Method (WM) as a typical contact angle measurement (th) method can be used for assessment of powder wettability (especially representative particle size range for flotation separation) However, as an indirect method, WM has several limitations. This investigation is going to introduce an Enhanced Washburn Method (EWM) which fills the gap of those WM obstacles, and can be applied for the meaningful indirect th measurement of powders. For such a purpose, the wettability of quartz powders (d80: 62 mm) was measured in the absence and in the presence of the cationic surfactant Flotigam(r)EDA at pH 10. EWM by using pre conditioning of hydrophobized particles via unblock capillaries measured the th of powders in different conditions. Statistical evaluations indicated that EWM could quite accurately measure th of the hydrophobized powders, where there is a significant coefficient of determination (R2 above 0.96) between EWM outcomes and other examined direct th measurement methods (the captive bubble and sessile drop methods)
author_names: Arash Tohry

R Atash Dehghan

Alexandre Vale Oliveira

Saeed Chehreh Chelgani

Laurindo de Salles Leal Filho
title: Enhanced Washburn Method (EWM) A comparative study for the contact angle measurement of powders
year: 2020

abstract: Abstract Based on the work initiated by Shanker, R.M. Baltusis, P.J. and Hruska, R.M. (Development of a new technique for the assessment of wettability of powders. Pharm. Res. 11 (Suppl) (1995) s243 (abstract) and Dove, J.W. Buckton, G. and Doherty, C. (Comparison of wetting behaviour of theophylline and caffeine using various contact angle measurement methods and inverse gas chromatography. In 15th Pharm. Technol. Conf. 19 21 March 1996, Oxford, UK) this study has focused on the determination of effectively wet perimeters during Wilhelmy plate immersion experiments of powder stuck on glue. Data generated from extrapolated immersion loads of plates in two different apolar liquids, enable a measure of powder wet perimeter. Such perimeters are used to derive contact angles of reference liquids on the particular powder. Two powders were taken as models: starch and ketoprofen.
author_names: Xavier J H Pepin

Sylvene Blanchon

Guy Couarraze
title: A new approach for determination of powder wettability
year: 1997

abstract: Abstract Super hydrophobic carbon nanotube (CNT) powders were formed by NF 3 glow discharge plasma at low pressure and their surface free energies were directly determined from the contact angles with probe liquids using the Owens Wendt plotting. The cushion made of plasma treated CNT powders revealed super hydrophobicity (contact angle 153deg) regardless of kinds of probe liquids and treatment time. The surface free energy of the NF 3 plasma treated CNT powders decreased drastically from 82.6 to 0.12 mJ/m 2 The plasma treatment using fluorinated compound gases may be useful for dispersing, separating, and cutting CNTs since CNTs have tendency to aggregate in bundles and poor solubility.
author_names: Yong Cheol Hong

Dong Hun Shin

Soon Cheon Cho

Han Sup Uhm
title: Surface transformation of carbon nanotube powder into super hydrophobic and measurement of wettability
year: 2006

abstract: In this work a cost effective instrument for measuring the wettability of powder materials was designed and developed, which works on the modified Washburn method. The instrument measures the mass gain against time due to penetration of the liquid into the powder materials using a microbalance and LabVIEW based data acquisition system. The wettability characteristic of different powders was determined from the contact angle using the modified Washburn equation. To demonstrate the performance of the developed instrument, the wettability of as received corn starch and nano coated corn starch powders was estimated with water as a test liquid. The corn starch powders coated with hydrophilic grade (Aerosil 200P) and hydrophobic grade (Aerosil R972) nanoparticles at different coating levels showed expected changes in their contact angle. Some of the results were also verified against the available standard instrument for wettability measurement and found to be consistent. The present configuration of the instrument costs about 500 US$ which is 15 to 20 times less than the available advanced models. The developed instrument is thus a cost effective solution for wettability measurement which can be used for materials in food processing, pharmaceuticals, horticulture, textile manufacturing, civil engineering etc. The developed instrument is expected to help many small scale industries or research labs who cannot afford an expensive instrument for wettability studies.
author_names: Manish T Thakker

Vikram Karde

Dinesh O Shah

Premal R Shukla

Chinmay Ghoroi
title: Wettability measurement apparatus for porous material using the modified Washburn method
year: 2013

abstract: Equipment for measuring the wettability (i. e. the contact angle) of hydrophobic powder was newly developed, based upon the so called constant flow method. This equipment has a feature in which the specific surface area of the powder, the threshold pressure at which a liquid begins to penetrate the powder bed and its contact angle are calculated and printed out. This happens when the values related to the operational conditions and the physical properties of air, liquid and powder used in the measurement are put in advance into the computer installed in this equipment.The availability of this equipment was confirmed by investigating the effect of operational factors such as the feed rate of pure water, the porosity of the powder bed and its height on the contact angle of aluminum hydroxide powder treated with stearic acid. The relationship between the contact angle of the sample powder and the concentration of stearic acid, the mixing time, the dispersion state in pure water or the amount of DOP (dioctyl phthalate) absorbed was also obtained.
author_names: Kanji Matsumoto

Hideaki Akutsu

Akihiko Yoshimidzu

Gong-hong Hong

Kinnosuke Watanabe
title: The Measurement of the Wettability of Hydrophobic Powder by the Constant flow Method
year: 1988

abstract: &NA; The aim of this study was to evaluate the choice of polymer and polymer level on the performance of the microstructure and wettability of hot melt extruded solid dispersion of Glyburide (Gly) as a model drug. The produced solid dispersion were characterised using scanning electron microscopy (SEM) image analysis using a focus variation instrument (FVI) differential scanning calorimetry (DSC) X ray powder diffraction (XRPD) X ray microtomography (X&mgr;T) dynamic contact angle measurement and dissolution analysis using biorelevant dissolution media (FASSIF) SEM and focus variation analysis showed that the microstructure and surface morphology was significantly different between samples produced. This was confirmed by further analysis using X&mgr;T which showed that an increase in polymer content brought about a decrease in the porosity of the hot melt extruded dispersions. DSC suggested complete amorphorisation of Gly whereas XRPD suggested incomplete amorphorisation. The static and dynamic contact angle measurement correlated with the dissolution studies using FASSIF media indicating that the initial liquid imbibition process as captured by the dynamic contact angle directly affects the dissolution performance. Graphical abstract Figure. No caption available. HighlightsSolid dispersions of glyburide made by hot melt extrusion.SEM and focus variation showed microstructure and surface morphology was significantly different.X&mgr;T showed that an increase in polymer content brought about a decrease in porosity.Static and dynamic contact angle correlated with dissolution using FASSIF media.Liquid imbibition captured by dynamic contact angle affects dissolution performance.
author_names: Maen Alshafiee

Mohammad K Aljammal

Daniel Markl

Adam Ward

Karl Walton

Liam Blunt

Sachin Korde

Sudhir K Pagire

Adrian L Kelly

Anant Paradkar

Barbara R Conway

Kofi Asare-Addo
title: Hot melt extrusion process impact on polymer choice of glyburide solid dispersions: The effect of wettability and dissolution
venue: International journal of pharmaceutics
year: 2019

abstract: Abstract Coal wettability is of considerable importance for determining the efficiency of the solubilization process. In principle, hydrophobic coal structure should be modified for effective contact with microorganisms in the coal biosolubilization process. The paper considers the image analysis method for determining the contact angle of chemically pretreated coal, where the measurement surface is prepared by pressing coal powder into tablets. Due to sessile drop asymmetry resulting from the heterogeneity of the substrate, liquid solid contact angles are evaluated along a three phase contact line. The source of a three dimensional drop image is a scan obtained with an infrared light beam from an optical coherence tomography device. The effect of coal pretreatment on biosolubilization by Gordonia alkanivorans S7 was investigated with the use of the method. To emphasize the relationship between coal wettability (hydrophilicity or hydrophobicity) and the possibility of coal liquefaction, Fourier Transform Infrared (FT IR) spectroscopic analyses were performed. Data obtained from infrared spectra showed changes in coal structure and confirmed a positive influence of nitric acid on coal biosolubilization. Due to a high liquefaction degree, it is possible to implement the process of lignite biosolubilization by G. alkanivorans S7 on a larger scale. The contact angle measurement method can be successfully applied in the selection of methods for the chemical and biological conversion of coal in various technological processes.
author_names: Jaroslaw Goclawski

Joanna Sekulska-Nalewajko

Bartosz Strzelecki

Irena Romanowska
title: Wettability analysis method for assessing the effect of chemical pretreatment on brown coal biosolubilization by Gordonia alkanivorans S7
venue: Fuel
year: 2019

abstract: The Wilhelmy method of the contact angle measurement was used for the wettability study of Fe2O3 and TiO2 pigments in aqueous environment. The pigment samples were attached to a glass plate by means of an adhesive layer. This simple technique allows relatively quick quantitative evaluations of powder samples' wettabilities avoiding problems accompanying the preparation of the sample by pressing necessary for sessile drop or Washburn method measurements.
author_names: Libor Kvitek

Petr Pikal
title: THE STUDY OF THE WETTABILITY OF POWDER INORGANIC PIGMENTS BASED ON DYNAMIC CONTACT ANGLE MEASUREMENTS USING WILHELMY METHOD
year: 2002

abstract: A simple experimental apparatus, based on the washburn equation, has been designed to evaluate the wettability of powder by measurement of the permeating height The concept of relative wetting contact angle (RWCA) has been put forward, and values of four kinds of ultra fine ZrO 2 powder have been measured
author_names: Ai De
title: MEASUREMENT OF WETTING CONTACT ANGLE OF POWDER BY PERMEATING HEIGHT METHOD
year: 2001