bluuebunny/crossref_metadata_2025 huggingface dataset:
The Preparation and Structure Characterization of Nano-Alumina Fiber Doped Cerium by Electrospinning
Authors: Sun Yi Dong , Kang Wei Min , Cheng Bo Wen
Published: July 2012

Alumina fiber, a kind of inorganic fiber, was widely used in many fields owing to its excellent performance. CeCl3/AlCl3/PVP was used as spinning solution for producing organic-inorganic hybrid fiber by electrospinning, then, alumina fiber doped cerium can be successfully obtained after high temperature calcination. In the paper, the influence of CeCl3 to the crystallization and thermal stability was discussed. The results show that alumina nanofiber with average diameters of 200nm-800nm are obtained by calcination of the as-prepared fibers .The addition of CeCl3 significantly delay the crystallization transformation process of alumina fiber, while the formation of CeO2 reduce diffusion rate of Al3+, eventually, imped the phase transformation of Al2O3 and improve its thermal stability.
Application of Nanometer Materials into Badminton Racquet Strings
Authors: Li Meng Long , Peng Hong Jian
Published: July 2012

As an emerging discipline, nanotechnology not only has been applied and popularized rapidly, but also widely used in sports equipments. In order to discuss the application of nanometer materials into the badminton equipments, this study introduces the development of nanotechnology and the manufacturing process of the nanofiber, analyzes the limitations and deficiencies of the traditional badminton racquet strings, and compares the racquet strings which are made from nanofiber with traditional racquet strings; the result shows that the badminton racquet strings which are made from nanofiber have prominent mechanical property and operational performance in comparison with the traditional racquet strings, and have very great application prospects. The application of the badminton racquet strings which are made by nanofiber materials is an inevitable trend.
The Nanocrystallinity Enhancement and Optical Characteristics of Pre-Hydrothermally Treated ZnO Nanoparticles
Authors: Yuwono Akhmad Herman , Ramahdita Ghiska , Sofyan Nofrijon
Published: July 2012

In the current research, ZnO nanoparticles have been synthesized via sol-gel technique assisted by a pre-hydrothermal treatment at 150oC with various holding time of 0, 24, 48 and 72 hours. This route was specifically aimed at investigating the effect of this treatment on the nanocrystallite size, crystallinity and band gap energy of the resulting nanoparticles. The results of investigation showed that an increasing of pre-hydrothermal treatment duration from 0 to 72 hours has increased the crystallite size of ZnO nanoparticles from 3.47 to 13.85 nm, and decreased the band gap energy from 3.10 to 3.08 eV.
Preparation of Carbon Nanotube / Polymer Composites
Authors: Yu Yong Peng
Published: July 2012

Due to the unique properties of CNTs its own scientists called a "super fiber" has an attractive prospect in the high-tech fields. In recent years, the research center of gravity of the CNTs composites have been transferred to the polymer / CNTs composite materials, and has made great progress. CNTs and polymer composite, CNTs from nanometer to the actual operation of an effective and efficient use of the unique properties of CNTs can be achieved with the advantage of raw materials to complement or strengthen. Polymer composite materials have broad application prospects in information materials, biomedical materials, high-performance structural materials, multifunctional materials.
Preparation and Damping Properties of Cups-Stacked Carbon Nanotubes(CSCNTs)/Prime 20
Authors: Liu Yan , Li Rui Feng , Peng Hua Xin , Han Zhi Wu
Published: July 2012

CSCNT is a new type carbon nanotube, which has better physical and mechanical properties than the traditional materials. In this study, the effect of the dispersion and concentration of cup-stacked carbon nanotubes on mechanical properties of the CSCNTs/epoxy nanocomposites were investigated. The epoxy resin system used in this study was a two component (resin and harder) Prime 20. The CSCNTs were dispersed into the Prime 20 by ultrasonic agitation and mechanical mixing together. And the morphologies of the fracture surface of CSCNTs/Prime 20 nanocomposites were observed by scanning electron microscope (SEM); damping behaviors of the nanocomposites were studied by DMA at frequency domain.
The Interfacial Cohesive Law of Composite for Carbon Nanotubes and Single Crystal Metals
Authors: Wei Gao Feng , Yan Ting Ting , Gao Hong Fen
Published: July 2012

In this paper the interfacial cohesive law of composite for single-wall carbon nanotubes (CNTs) and single crystal metal is characterized by van der Waals force, and the new interfacial cohesive law is established. The van der Waals force is sensitively related to the distance of atoms, therefore single crystal metal is delaminated according to the structure of crystal lattices that the metal atoms of same distance to CNTs are divided into one layer, and a series of parameters are obtained. The analytical expressions of the new cohesive law are useful to studying the composite interface between CNTs and single crystal metal, and can give the macro properties of the composites accurately.
Advances in Model Development for Carbon Nanotube Assembly by Dielectrophoresis
Authors: Liu Yan Yan , An Li Bao , Ding Chao
Published: July 2012

As a new type of materials, carbon nanotubes (CNTs) have been intensively studied due to their outstanding properties. Dielectrophoresis (DEP) is an effective method to assemble CNTs across a pair of electrical conductors for various applications. In DEP, CNTs suspended in dielectric liquid medium suffer a force imbalance due to induced dipole moment when subject to an externally applied non-uniform electric field, and move towards and finally deposit onto the electrode region. As a model plays a critical role in the numerical study of the DEP process, this paper introduces the theoretical background of DEP and basic DEP models based on the effective dipole moment method which has been widely accepted in the study of DEP. Particularly, the DEP force calculation methods developed recently for improved precision using these basic models are presented and discussed. A DEP model with high computing accuracy helps precisely predict a DEP process.
Controlled Growth of Germanium Nanowires via a Solid–Liquid–Solid (SLS) Mechanism
Authors: Lee Shih Fong , Lee Li Ying , Chang Yung Ping
Published: July 2012

In this study, germanium nanowires (GeNWs) were grown directly on gold-evaporated germanium substrates by a solid-liquid-solid (SLS) mechanism in the temperature range 550°C- 650°C. The growth of GeNWs is very sensitive to the growth temperature and only in a limited temperature range (575°C-625°C) can GeNWs having excellent morphology and high surface density be successfully grown. These long, thin, and straight GeNWs have a high aspect ratio and are surrounded by an oxide layer. The composition of corresponding oxide layers is GeOx (x<2). As the thickness of Au film is decreased from 9 nm to 1 nm, the average diameter of GeNWs decreases from 119.3 nm to 38.5 nm. Our experimental results demonstrate that the diameter of germanium nano¬wires can be controlled by the thickness of Au metal film.
UV Resistance of γ-Glycidoxypropyltrimethoxysilane / TiO2-ZrO2 Hybrid Nanocomposite Films Prepared by Sol-Gel Method
Authors: Yue Yan Ping , Huang Min , Jiao Yuan Qi , Zeng Xing Rong , Liu Zhi Meng , Liu Yu Ping , Lin Xiao Dan
Published: July 2012

UV resistance of hybrid nanocomposite films of γ-Glycidoxypropyltrimethoxysilane (GPTMS)/TiO2-ZrO2prepared by Tetrabutoxytitanate, Zirconium n-tetrabutanoxide and GPTMS via sol-gel method were analyzed by observation of the film appearance, thermal gravimetric analysis (TGA), UV-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR) before and after UV irradiation. It was found that cracks on the hybrid films increase with irradiation time, total inorganic content and the content of TiO2. The transmittance of the hybrid film increased with the increase of ZrO2content, which blocks part of the photo catalysis effect of TiO2. When the ZrO2content increased to equal with TiO2, UV resistance of the hybrid film approaches that of pure ZrO2. The irregular behavior of yellow index data indicates that the deterioration in transmittance is caused by cracks mainly. FTIR results show that the hybrid film of TiO2/ZrO2(3/1) (T3Z) still retains a stronger photo catalysis effect, after UV irradiation, the peak indicating the concentration of –OH enlarged greatly, while that of the pure ZrO2hybrid film remains unchanged.
Effects of Melt Superheating Holding Time on Solidification Structure and Mechanical Property of AZ31B Magnesium Alloy
Authors: Chen Shu Ying , Huang Yu Duo , Chang Guo Wei , Liu Sheng Yang
Published: July 2012

Effects of melt superheating holding time on microstructure and mechanical properties of AZ31B magnesium alloy were studied. The results show that the grain size of AZ31B magnesium alloy is gradually increased with the elongation of holding time. The grain is the finest without insulation work, and the increase amplitude of grain size is the most when holding for 20 minutes in this experiment. The higher is the melt superheating temperature, the larger the increase amplitude of grain size when holding for 20 minutes is. The tensile strength, yield strength and elongation percentage of AZ31B magnesium alloy specimens are small declined with the elongation of holding time under lower melt temperature. At 850°C or 900°C, the mechanical properties are rapidly declined with the elongation of holding time when holding time is less than 20 minutes, whereas the mechanical properties are slight increased when holding time is more than 20 minutes. DSC analysis shows that the elongation of holding time causes the increase of solidification onset temperature and the augment of solidification range, so the undercooling degree and nucleation rate are decreased in the melt, which result in the grain coarsening and the mechanical properties decrease.
Synthesis of Carbon Nanotube and Carbon Nanofiber in Nanopore of Anodic Aluminum Oxide Template by Chemical Vapor Deposition at Atmospheric Pressure
Authors: Kasi Jafar Khan , Kasi Ajab Khan , Wongwiriyapan Winadda , Afzulpurkar Nitin , Dulyaseree Paweena , Hasan Mahadi , Tuantranont Adisorn
Published: July 2012

Carbon nanotube (CNT) is one of the most attractive materials for the potential applications of nanotechnology due to its excellent mechanical, thermal, electrical and optical properties. We demonstrated the fabrication of carbon nanotube and carbon nanofiber (CNF) inside the pore and at the surface of anodic aluminum oxide (AAO) membrane by chemical vapor deposition method at atmospheric pressure. Ethanol was used as a hydrocarbon source and Co–Mo as catalyst. CNT was synthesized at different temperature. High graphitic multiwall carbon nanotube (MWCNT) was found at 750°C, while CNF was found at 800°C and above temperature analyzing by Raman spectroscopy.
Preparation of Fe-Mn Oxide Nanoparticles inside Carbon Nanotubes
Authors: Zhang Xiao Feng , Li Da Guang , Fu Wei Qin , Peng Wei
Published: July 2012

The filling of carbon nanotubes with Fe-Mn oxide via wet chemistry was presented. IR, XRD and TEM were used to characterize the structural features and the morphology. Cyclic voltammetry was used to investigate the electrochemical behavior of the samples. Results shows that the Fe2O3 and MnO2 were filled the tube inner cavity successfully and the nanocomposites were valuable for supercapacitor materials.
Preparation and Characterization of Nanoenergetic Materials Based on KNO3-Filled Carbon Nanotubes
Authors: Guo Rui , Hu Yan , Shen Rui Qi , Ye Ying Hua
Published: July 2012

A novel nanoenergetic material was prepared by filling KNO3in the CNTs through a wet chemical method. The samples were characterized by TEM, XRD, and TG/DSC. The results show that KNO3with a mean diameter of ~9 nm were homogeneously filled into CNTs to form KNO3@CNTs nEMs. The TG/DSC curves indicate that the reaction enthalpy (ΔH) of KNO3@CNTs nEMs was 876.1 J/g and the characteristic temperature of the exothermic peak was 386.8 °C.
Synthesis of Bismuth Oxide Nanoparticles by a Templating Method and its Photocatalytic Performance
Authors: Pan Chuan Yi , Yan Yan , Li Heng De , Hu Sheng
Published: July 2012

A diblock copolymer template of nonbornene derivatives was employed to prepare Bi2O3 nanoparticles. The precursor formed within the nano-size micelles of diblock copolymer after introducing BiCl3 into the template. The precursor was calcined to produce Bi2O3 nano particles, XRD and TEM show that these nanoparticles are the α-Bi2O3 phase and have an average size from 10 to 30 nm. The photocatalytic performance of Bi2O3 particles has been tested in the degradation of methyl orange solution at visible light condition.
Effects of Length Fluctuation on Damage Spreading in a Triangular Nanowire Array
Authors: Guo Zi Zheng
Published: July 2012

A realistic quantum magnetic disk structure formed by a nanowire array is studied. The length fluctuation of the nanowires is described with Gaussian distributions. The magnetostatic interaction between two nanowires with different length and radius is derived. Based on that, we study the thermal stability of the nanowire array analytically and numerically by the damage spreading technique. The results show that when the magnetic cell’s spacing reduces (the storage density increases) or the nanowire length increases, damage spreading becomes difficult and the system stability is enhanced. In addition, the long-range magnetostatic interaction and the shape anisotropy make the system more stable and the nanowire length fluctuation influence is comparatively small.
Microstructure and Mechanical Properties of Horizontal Continuous Casting Al-18%Si Alloy Billets
Authors: Zhang Jing , Yu Hua Shun , Kang Suk Bong , Cho Jae Hyung , Min Guang Hui
Published: July 2012

Horizontal continuous casting (HCC) Al-18%Si alloy billets were prepared with the addition of fine-grained Al-18%Si as a master alloy. The influence of cooling conditions and this fine-grained structural materials addition on the microstructure and tensile properties were studied. The uniformity of the HCC Al-18%Si alloy billets was also analyzed. The results denote that the HCC Al-18% Si alloy billets showed finer microstructure and better mechanical properties after double cooling. Fine-grained structural material addition can effectively reduce macrosegregation and make both primary and eutectic silicon much finer. The ultimate tensile strength clearly increased with an addition of 15 percent fine-grained structural material compared to the HCC alloy with no addition of fine-grained structural material. However, a small decrease occurred after an addition of fine-grained structural material up to 30 percent.
Effect of La Doping on Structural and Magnetic Properties of SrLaxFe12−xO19 Ceramics from Aqueous Solution Method
Authors: Liu Jian An , Zhang Mei Mei , Liu Shu Jiang , Yang Xue Na
Published: July 2012

Influences of different amount of La-substituted on structural and magnetic properties of M-type strontium ferrites SrLaxFe(12−x)O19 compounds prepared by an aqueous solution method have been systematically investigated by XRD, VSM and TEM. In this work, it is found that only magnetoplumbite structure exists in the sample rather minorphases from the XRD patterns. When the doping content is x≤0.06mol, substituting of La3+ for Fe3+ occurs, forming SrLaxFe(12-x)O19. In contrast, when the doping content is x>0.06mol, Sr2+ is substituted by La3+, forming Sr(1-x)LaxFe12O19. The saturation magnetization (σs) shows its maximum at x=0.04 while the peak value of the intrinsic coercive field (Hjc) presented at x=0.06 as the La substituted content increases. The obtained results also indicated that the shape of the formed SrLaxFe(12−x)O19 is oblong with 70nm length and 40nm width.
Design and Synthesis of Fluorescent Betahistine Conjugates with Unique Imaging Property
Authors: Qin Qiu Yan , Qian Yi Ping , Wang Zi Yu , Fan Xiao Lin
Published: July 2012

Labeling cardiovascular drugs probes with a fluorescent tag is an alternative method of measuring drugs activities and distributions in vivo, and further using of advanced tools to diagnose or detect cardiovascular diseases. Using this approach, a fluorescent probe (betahistine-Flu, 1) of Betahistine-based was synthesized and characterized by 1H NMR, 13C NMR and LC-MS, and its UV-Vis absorption spectral and fluorescence spectral, and fluorescence imaging in cell model were investigated. It was found that the fluorescent probe display strong green fluorescence, and have good optical effect in cell. This study reveals a good and interesting results of betahistine-directed fluorescent probe, and its may be a possible candidate for cardiovascular disease diagnosis and analysis in vivo.
Synthesis and Characterization of Blue Light Emitting N,N-Dimethylpyren-1-Amine and its Vinyl Polymer
Authors: Wang Jian Li , Leung Louis M
Published: July 2012

A new small molecule N,N-dimethylpyren-1-amine (DMPA) was synthesized and its vinyl polymer poly(N,N-dimethylpyren-1-amine) was polymerized by free radical polymerization. The chemical structure and properties of DMPA and P(DMPA) were characterized by NMR, GPC, TGA, DSC, UV-Vis, PL, CV and quantum yield measurements.
Synthesis and Photochromic Properties of 1-(Thien-3-yl)-2-(thien-2-yl)ethene Having Bromo at 4-Position of Thiophene Moieties
Authors: Zhao Sheng Min , Zhao Rui , Chen Xian , Zhang Wen Guan
Published: July 2012

1-(2,5-Dimethyl-thien-3-yl)-2-(4-bromo-3,5-dimethyl-thien-2-yl)perfluorocyclopentene has been synthesized. The open-ring isomer of the compound in hexane is colorless and the absorption maximum was observed at 316 nm (ε = 8700M-1cm-1). The close-ring isomer of the compound in hexane is yellow and the absorption maximum was observed at 468 nm (ε = 6280M-1cm-1). Upon irradiation with 313 nm light, the conversion from the open- to the closed-ring isomer of the compound εwas 72% in the photostationary state. Bromo at 4-position of the thiophene moieties does not affect the absorption maximum and changes slightly absorption coefficient.
Experimental Study on the Mineral Processing of a Certain Low Grade Copper-Molybdenum Ore in XINJIANG
Authors: Li Feng Jiu , Zhang Li Min , Lv Wen Zhi
Published: July 2012

Aimed at the ore characteristics，the flotation flowsheet of one—stage coarse grinding—bulk flotation of copper and molybdenum—regrinding of bulk concentrate—separation of copper and molybdenum was determined effected．Experiment uses the above flowsheet and reasonable conditions to process molybdenum crude ore of molybdenum and copper crude grade being 0.066% and 0.03%,and the better indexes of the molybdenum grade of concentrate is 51.68%,the copper grade of concentrate is 12.60% and molybdenum recovery is 74.33% are got.
Ca3Sc2Si3O12:1%Ce3+, x%Ba2+ Green Phosphors for White Light-Emitting Diodes
Authors: Chen Yi Bo , Cai Wei , Liu Yong Qiao , Gong Meng Lian
Published: July 2012

Low temperature-quenching and high-efficiency Ca3Sc2Si3O12:1%Ce3+, x%Ba2+ phosphors were prepared by solid state method and the properties of these phosphors were investigated. The results showed that co-doping of Ba2+ ions can improve the photoluminescence properties and decrease temperature-quenching of Ca3Sc2Si3O12:Ce3+ phosphor obviously. High-efficiency blue-green light-emitting diode was fabricated with the prepared phosphor and an InGaN blue-emitting (~460 nm) chip. Good performance of the prepared LED indicates that Ca3Sc2Si3O12:1%Ce3+, 0.5%Ba2+ phosphor is a suitable candidate for the fabrication of high-efficiency white LEDs.
Influence of Sr2+ Doping Quantity on Microstructure and Magnetic Performance of Z Type Hexagonal Ferrite
Authors: Yu Li Hua , Yao Jing , Feng Ze Kun , Huang Ai Ping
Published: July 2012

Co2Z type planar hexaferrite doping of Sr2+ 2CoO∙3Ba1-xSrxO∙10.8Fe2O3 is made with common production process of cermet. The paper studied the influence of Sr2+ doping quantity on microstructure and magnetic performance of Co2Z type planar hexaferrite. The result indicates that when the doping quantity x=0.4, the magnetic performance in ultrahigh frequency will get improved, the initial permeability can grow to 14, and the cut-off frequency will also relatively increase to 2.45GHz.
Study on Material Constant Values of Ti-6Al-4V-Rare Earth Titanium
Authors: Zhao Pei Feng , Wang Qing Fu
Published: July 2012

According to hot compressive test date, relationship between flow stress, temperature, strain rate and strain is studied. Material constant value is researched through single regression, such as activation energy Q, stress level parameters and structure factor A. The results show dynamic recovery is principal in the softening process of .titanium and Ti-6Al-4V-Rare Earth Titanium is positive strain rate sensitive material.
On the Principle and Application of Concrete Admixtures
Authors: Zhang Tao , Xu Yun Yun , Chen Lei
Published: July 2012

Widely used for concrete admixtures, the development status of concrete admixtures is summarized, the two classification methods of concrete admixtures are induced. Especially, currently mainly used four kinds of admixtures, water reducer, air entraining agents, retarders, and early strength agent, the working principle, the problem of construction application, the direction of development and construction technology are analyzed. Finally, admixture overall future direction of development prospect is presented.
Research on the Relationship between the Thickness of the Hard Strata and the Roof Caving Hidden Danger Level
Authors: Liu Hong Tao , Li Ji , Jiang Li Shuai , Fan Long
Published: July 2012

In order to find out the cause of the mining roadway of mine test roof fall in the excavation period, to based roof stability partition method, The main research methods is using RFPA software numerical simulation, according to the specific condition roof strata of the mine test, build 6 different thickness of medium sandstone model, get the corresponding characteristics of roof deformation and roof caving hidden danger level. The results of the study show that under the condition roof strata of the mine test, At the stratigraphic horizon is certain, Thickness decrease of medium sandstone is the main cause of roof fall, when the thickness of medium sandstone less than 1.5m,the roof is unstable, roof caving hidden danger level depend on its upper strata; 1.5m is constant critical value of roof caving hidden danger level, the middle of roadway have be deformation, but articulate between rock block can also keep the roadway stable; when the thickness of medium sandstone more than 1.5m, it can be loading layer, roof caving hidden danger risk is low, the type rock is Ⅰ level, the roadway is basically never collapse.
Waterproof and Impermeability Technology Strategy of Constructional Engineering
Authors: Gong Wen Ye , Bai Biao
Published: July 2012

Building leakage is a chronic and stubborn disease to influence the quality of building engineering. The traditional waterproof coiled material such as asphalt has properties of poor weather resistance, easy to crack and large pollution. GT is a kind of green building material with superior performance. GT materials used in building waterproof can fundamentally solve the problem of waterproofing, impermeability and plugging in construction. In this article, the author discuss performance characteristics, construction technical measures and quality testing standards of GT paint, analysis the technical points of GT waterproof paint applied in construction engineering.
Analysis of Collapse Vibration Action of Air-Interlayer Structure for Explosive Resistance
Authors: Tao Xi Gui , Yu Jiang , Shen Yue Guo , Jiang Liang Yan
Published: July 2012

Diffuse action of air-interlayer structure for blast resistance is analyzed, and it takes on well diffuse effect and economic benefit compare with earth. Based on theory analysis, action and design of air-interlayer and collapse-vibration insulate structure was analyzed, and advise was given, which can provide reference for design.
Study on Compound Modification of Sodium Silicate
Authors: Wang Li Ge , Tang Rang Wei , Zhou Long , Wang En Ze
Published: July 2012

In this paper, two-component compound modifiers were used to modify sodium silicate, preparing a new type of inorganic-organic composite cold pellet binder consolidation. The dispersion of its formative adhesive films is good and the bonding ability is also high. By changing modifier ratio and addition, the information of pellet structure and composition was studied. The results showed that: when the compound modifier-component mass ratio is 1:1, adding the amount is 2%, the modified adhesive bond strength is higher, the production of pellets using compression strength up to 2.75KN / a, meeting the needs of blast furnace smelting.
The Effect of Temperature on the Mechanical Properties of CA Mortar
Authors: Wang Li , Ping Wang , Zeng Xiao Hui , Chen Rong
Published: July 2012

The compressive strength and the flexural strength of CA mortar at different temperature conditions were all tested. We have found that temperature has great influence on the mechanical properties of CA mortar. As the temperature increase from -40°C to 60°C, its compressive strength decrease from 31.7MPa to 1.5MPa for CRTS I type CA mortar, while the same rule can be found to the flexural strength. Results also showed that as the content of asphalt in mortar increases, the temperature sensitivity of mechanical properties increases.
Warm-Mix Asphalt Pavement Performance and Energy-Saving Analysis Based on Crushing Bass
Authors: Zhong Hong Hai , Liang He Hao , Liu Jia , Zhang Rong Hui
Published: July 2012

To the old cement concrete pavement which lost the overall loading capacity and large areas are damaged, by using rubblization technology to shocks, crushing and compaction it, pouring the warm-mix asphalt sealing, formed less than 60mm size of flexible base of gravel and paved with warm-mix asphalt pavement on this base. This article is about analysis of interlinear stresses of pavement structure and production cost analysis of mixture on this combination structure. Proved that the structure could in-place recycling, solving the environmental issues of dropped cement pieces garbage. Mix in mixture, spreading process of reducing harmful gas emissions, can save more than 30% of construction costs.
Leaching Characteristics of Cement-Fly Ash Pastes
Authors: Li Xiang , Zhang Liang , Li Jia Zheng
Published: July 2012

The leaching characteristics of cement-fly ash pastes were investigated by MIP, XRD and TG. The results show that the microstructure of hardened cement-fly ash paste deteriorates partly after leaching of soft water. At the leaching duration of 180 days, the hardened paste containing fly ash deteriorated a little more serious than the plain cement paste, but the incorporation of fly ash in a proper ratio was helpful to defer the trend of deterioration of the hardened paste microstructure. The microstructural stability of hardened cement-fly ash paste wasn’t damaged severely during the 180 days leaching duration.
Corrosion Inhibition of 2-Mercaptobenzothiazole for Carbon Steel in Sulfuric Acid Solution
Authors: Liang Xiao Feng , Yang Xue
Published: July 2012

The inhibition effect of 2-Mercaptobenzothiazole (2-MB) against the corrosion of carbon steel in sulfuric acid solution was studied by weight loss measurement and electrochemical measurements(potentiodynamic polarization techniques). The results show that 2-MB acts as a good corrosion inhibitor in sulfuric acid solution. Adsorption of 2-MB is found to obey Langmuir isotherm. Polarization curves indicate 2-MB is a mixed-type inhibitor. The effects of temperature and sulfuric acid concentration were also studied.
Grey Clustering Analysis of the Comfort Properties of Bamboo Pulp/Cotton Interwoven Fabric
Authors: Ma Shun Bin , Huang Xu , Zhang Wei Dong
Published: July 2012

The comfort properties of fifteen bamboo/cotton interwoven fabrics with different specifications were tested, such as moisture sorption property, air permeability, capillary effect property, etc. then the author tasked fifteen bamboo/cotton interwoven fabrics as clustering object, water—vapour transmission rate、air permeation rate、weft liquid capillary effect height and warp liquid capillary effect height as clustering index, using the grey clustering analysis to evaluate the bending，creasing and draping properties synthetically. The results show that: The first grey type including 1#、2#、4#、7#, achieved optimal standard；The second grey type including 3#、5#、6#、8#、10#、11#、13#，achieved good standard；The third grey type including 9#、12#、14#、15#，their comfort properties were poor.
Preparation of Hollow Carbon Spheres with Large Size and High Specific Surface Area from Phenolic Resin
Authors: Yang Bin , Wang Cheng Yang , Zheng Jia Ming , Chen Ming Ming
Published: July 2012

Millimeter size Hollow carbon spheres (HCSs) with high specific surface area were successfully prepared from resole-type phenolic resin by suspension polymerization method at ordinary pressure. During the polymerization process, large sums of small molecule gathered at the center and formed the hollow part, bigger spheres with a broad size distribution were then formed under stirring force and surface tension, the maximum external diameter of the obtained HCSs was 1.2mm and the hollow diameter was about 0.35mm. After activating at 800°C under a stream of steam, the specific surface area and total pore volume of the HCSs were reached as 1117m2/g and 0.61cm3/g.
Preparation and Properties of Antibacterial Functional PET Fibers with Ag-Loading MWNTs
Authors: Zhang Rui Ping , Hou Wen Sheng , Dai Jin Ming , Niu Mei , Xiang Peng Wei , Gao Li Bin
Published: July 2012

With Ag-loading MWNTs antibacterial agent as functional material, the antibacterial functional PET fibers were prepared by melt blending spinning-draft one-step method. The crystallinity and the orientation of specimens were characterized by differential scanning calorimetry, polarization microscope and sound velocimeter. Moreover, the mechanical properties and antibacterial properties were measured. The results showed that the antibacterial PET fibers had good spinnability when the content of Ag-loading MWNTs less than 1.0 % (wt); compared with pure PET fibers, the degree of crystallinity, the degree of orientation and the fracture strength were improved, but the elongation was decreased; the antibacterial PET fibers exhibited excellent antibacterial properties against E.coli by the method of flask shaking.
Effect of Viscosity Stabilizer on the Properties and Structure of Raw Constant Viscosity Rubber
Authors: Wang Yong Zhou , Wang Ping Yue , Zhang Bei Long , Huang Hong Hai , Ding Li , Zhang Fu Quan , Fang Lei , Zeng Ri Zhong
Published: July 2012

The properties of raw constant viscosity natural rubber were measured using a rubber processing analyzer. The results show that the rubber processing analyzer can characterize well the effect of viscosity stabilizer on the dynamic mechanical properties of raw constant viscosity rubber by applied strain sweep or frequency sweep. In linear viscoelastic region, the increment of the dynamic torque S’ of the constant viscosity natural rubber prepared with hydroxylamine hydrochloride decreases with the increase in the level of hydroxylamine hydrochloride . In the range of low frequency, the increment of the dynamic modulus G’ of constant viscosity natural rubber prepared with hydroxylamine hydrochloride is obvious lower than those of natural rubber and constant viscosity natural rubber prepared with aniline. G’ of the constant viscosity natural rubber prepared with aniline is just only a little higher than that of natural rubber. Hydroxylamine hydrochloride and aniline can decrease the molecular weight of rubber, and change the molecular weight distribution. The dynamical properties of constant viscosity natural rubber are dependent on the molecular weight and the molecular weight distribution.
Electrical Properties of Zr-Doped La2O3 Nanocrystallites as a Good Gate Dielectric
Authors: Bahari Ali , Gholipur R. , Khorshidi Z.
Published: July 2012

Issues such as Tunneling, Leakage Currents and Light-Atom Penetration through the Film Are Threatening the Viability of Ultra-Thin Sio2as a Good Dielectric for Industrial and Electronic Devices and in Ceramic Technologies. in this Paper, the Effect of Zirconium-Doped Lanthanum Oxide Is Investigated in the Hope that this Material Can Be Used as a Good Gate Dielectric for the next Generation of CMOS (Complementary-Metal-Oxide-Semiconductor). Zirconium Lanthanum Oxide Nanocrystallites with General Formula of Zrxla1-xOyWere Prepared by Using the Sol-Gel Method, such that the Zr Atomic Fractions in the Material Were in the Range of X = 5%, 20% and 50%. the Nanocrystallite’s Phases and Properties Were Characterized Using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) Techniques. Electrical Property Characterization Was Also Performed Using the Cyclic-Voltameter (C-V) Technique in TRIS Solution (pH = 7.3). C-V Measurements Show that Current through the TRIS Reduces at Higher Temperatures. Moreover, Elemental Qualitative Analysis Was Performed via Energy Dispersive X-Ray (EDX) Spectroscopy and Confirmed the above Claims.
Electrical Conductivity and Phase Transition Studies in the ZrO2-CdO System
Authors: Beg Saba , Haneefaa Sadaf
Published: July 2012

The Solid Solution of ZrO2: Cdo Was Prepared by the Conventional Solid-State Reaction. Effect of Dopant Concentration on the Electrical Conductivity of ZrO2Was Studied for Different Compositions at Different Temperatures. the Conductivity Increases with the Addition of Cdo due to the Migration of Vacancies. the Conductivity Increases with Rise in Temperature up to 180°C and Thereby Decreases due to the Collapse of Fluorite Framework. A Second Rise in Conductivity at High Temperature beyond 460°C Is due to the Phase Transition of ZrO2from Monoclinic to Tetragonal. DSC, X Ray Powder Diffraction, Impedance Measurements and FTIR Spectral Studies Were Carried Out for Confirming the Doping Effect and Transitions in ZrO2. the Addition of Cdo to Zro2 Shifted the Phase Transition of ZrO2to Higher Temperatures as Confirmed by the DSC Results. the Occurrence of Single Semi Circle with a Low Frequency Inclined Spike Indicates that the Conductivity Is Mainly due to the Movement of Oxide Ions.
Growth of ZnO Thin Films on Silicon Substrates by Atomic Layer Deposition
Authors: Hussin Rosniza , Hou Xiang Hui , Choy Kwang Leong
Published: July 2012

Atomic Layer Deposition (ALD) Offers the Key Benefits of Precise Deposition of Nanostructured Thin Films with Excellent Conformal Coverage. ALD Is Being Used in the Semiconductor Industry for Producing High-k (high Permittivity) Gate Oxides and High-K Memory Capacitor Dielectrics. Zno Has Attractive Properties for Various Applications such as Semiconductors, Gas Sensors and Solar Cells. in this Study, ZnO Thin Films Were Deposited via ALD Using Alternating Exposures of Diethyl Zinc (DEZ) and Deionized Water (H2O) on Silicon Wafer (100). the Thin Films Were Analyzed Using X-Ray Diffraction (XRD), Ellipsometer and Atomic Force Microscope (AFM). the XRD Analysis Shows the Presence of ZnO Thin Films with a Hexagonal Wurtzite Structure. the Thickness of ZnO Thin Films Was Correlated with the Substrate Temperatures and Deposition Cycles. the Coating Thickness Was Found to Increase with the Increase of the Deposition Cycles, but it Decreased with the Increase of Deposition Temperature. the Nucleation and Growth Mechanism of Zno Thin Film Has Been Established. it Can Be Concluded that, the Growth Mechanism of Zno Films Is Strongly Dependent on the ALD Processing Conditions.
Observation of Dielectric Peaks in Glassy Se70Te20Sn10 Alloy
Authors: Sharma A. , Mehta N.
Published: July 2012

The Temperature and Frequency Dependences of the Dielectric Constants () and Dielectric Loss (") Were Studied in Glassy Se70Te20Sn10Alloy in the Audio-Frequency Range below the Glass Transition Region. the Results Indicated that Dielectric Dispersion Occurred in Glassy Se70Te20Sn10Alloy. Well-Defined Dielectric Peaks Were Obtained in Glassy Se70Te20Sn10Alloy; these Are Rarely Observed in Chalcogenide Glasses. such Loss Peaks Were Not Observed in the Glassy Se80-xTe20SnxSystem in the past for Sn Concentrations of x ≤ 8. A Detailed Analysis of the Data Showed that the Results Could Be Explained in Terms of Dipolar Relaxation, with a Distribution of Relaxation Times, this Is Quite Expected in the Case of Chalcogenide Glasses.
Study of Nanocrystalline NiAl Alloys Prepared by Mechanical Alloying
Authors: Gherib M. , Otmani A. , Djekoun A. , Bouasla A. , Poulain M. , Legouira M.
Published: July 2012

Nanostructured Powders of Ni-20wt%Al and Ni-50wt%Al Were Prepared, by Mechanical Alloying under an Argon Atmosphere, from Elemental Ni and Al Powders Using a Planetary Ball Mill (type Fritsch P7) for Different Times (0.5-24h).). Microstructural and Structural Features of the Final Products Were Characterized by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). the Results of the XRD Shows the Formation of the B2 (Ni Al) Phase after 2 Hours of Milling for both Systems. Also Detected Was the Ni3al Phase in Ni80al20after 4 Hours. Crystallite Size Refinement of the Final Product Occurred down to Nanometer Scales when the Milling Time Increased, and Attained 17 Nm in the Ni50al50System and 20 Nm in the other System, at 24 Hours. this Decrease in Crystallite Size Is Accompanied by an Increase in the Interval Level Strain. the Kinetics of Al Dissolution during the Milling Process of Ni50al50System Can Be Described by Two Regimes, Characterised by Different Values of Avrami Parameters which Are Calculated by Using the Johnson–Mehl–Avrami Formalism.
Estimating the Activation Enthalpy for Defect Formation in 5754 Alloys by Using Nuclear, Electrical and Mechanical Methods
Authors: Ibrahim Alaa M. , Hassen E.M. , Abdel-Rahman M. A. , Badawi Emad A.
Published: July 2012

The Positron Annihilation Lifetime Technique (PALT) Is One of the Most Important Nuclear Non-Destructive Techniques. it Was Used to Study the Activation Enthalpy for Defect Formation in 5754 Alloy. Quenching Experiments Were Usually Performed on Thin Specimens to Ensure a Uniform Quenching Rate throughout the Specimen. from such Measurements, it Is Possible to Deduce the Vacancy Formation Enthalpy which, in Combination with the Results of Self-Diffusion Measurements, Gives a Value for the Migration Enthalpy of the Vacancy. these Are Very Important Quantities in the Study of the Annealing of Irradiation-Induced Defects. the Use of the Quenching Technique in the Positron Annihilation Study Has the Advantage that it Allows a Distinction to Be Made between Vacancies and Dislocations. Correlations between Nuclear, Electrical and Mechanical Methods Have Been Carried Out after Quenching.
Natural Convection Flow Simulation of Nanofluid in a Square Cavity Using an Incompressible Generalized Lattice Boltzmann Method
Authors: Rahmati Ahmad Reza , Niazi Sina , Beni Mehrdad Naderi
Published: July 2012

In this Paper, the Heat Transfer Performance in an Enclosure Including Nanofluids Is Studied. the Velocity Field Is Solved by an Incompressible Generalized Lattice Boltzmann Method and Heat Transfer Is Simulated Using Single-Relaxation-Time Lattice Boltzmann Method. the Hydrodynamics and Thermal Fields Are then Coupled Together Using the Boussinesq Approximation. the Fluid in the Square Cavity Is a Cu-Water Nanofluid. the Effects of Grashof Number and Solid Volume Fraction on Thermal and Hydrodynamic Characteristics Are Investigated. the Results Obtained Clearly Show that Heat Transfer Enhancement Is Possible Using Nanofluids in Comparison to Conventional Fluids. Comparisons with Previously Published Works Are Performed and Found to Be in Excellent Agreement with Existing Data.
Structure and Properties of Silver Clusters Implanted in PET by PVD Sputtering for Active Packaging Applications
Authors: Benelmekki M. , Torrell M. , Xuriguera E. , Vaz F. , Teixeira V.
Published: July 2012

Active packaging is becoming the most suitable way to control and assure food safety from farm to fork. In this way, commercial products with finely dispersed nanosilver (n-Ag) particles permanently embedded in the containers are already available in the market. New plastic materials with inherent antibacterial properties can be made for this purpose by polymerization or copolymerization of new monomers or by chemical modification and/or blending of polymers. However the development of new materials by use of new monomers leads often to unacceptable high costs and changes in the bulk properties. Sometimes the obtained materials also suffer a poor thermal stability, which limits their processability. A possible alternative is to use of functional coatings, which improves surface properties of a given substrate leaving unchanged its bulk properties. This technology is limited by mechanical properties of the coating and bad adhesion to the substrates. In this work, we propose a new approach to antibacterial silver activity in packaging by implanting Ag clusters in PET (Polyethylene Terephthalate) substrates by DC sputtering technique. To improve the impermeability of the PET to the gases and water vapour, a Ag:TiOx nanofilm with homogeneous Ag nanoclusters distribution was successfully deposited by DC magnetron sputtering on PET
Modification and Characterization of the Surface of SOI Nanowire Sensors
Authors: Naumova O.V. , Fomin B.I. , Malyarenko N.F. , Popov V.P.
Published: July 2012

In the present study, the pursued purposes were: (i) monitoring the electrical properties of silicon-on-insulator nanowires (SOI NWs), (ii) determination of surface treatments suitable for obtaining reproducible states on the surface of SOI NWs after their long-term storage, and (iii) identification of surface treatments suitable for regenerating the NW surface after protein (bovine serum albumin molecules) detection. It is shown that, during storage, with the passage of time a negative effective charge was accumulated on the surface of n-SOI NWs up to surface density Qeff = (2-4)х1012 cm-2, while the interface states at the NW/SiO2 interface underwent relatively slow depassivation. Treatments in H2O2 with subsequent treatments in HF can be used for removing organic contaminations from the NW surface and for regenerating the initial working state of SOI NWs after protein detection.
Three Transducers Embedded into a Single SiC Photodetector: LSP Direct Image Sensor, Optical Amplifier and Demux
Authors: Vieira M. , Louro P. , Vieira M.A. , Costa J. , Fernandes M.
Published: July 2012

A double pi’n/pin a-SiC:H heterostructure with two optical connections for light triggering in different spectral regions is presented and its behavior as image and color sensor, optical amplifier and demux device is discussed. The design and the light source properties are correlated with the sensor output characteristics. Different readout techniques are used. When a low power monochromatic scanner readout is used the transducer recognizes a color pattern projected on it acting as a color and image sensor. Scan speeds up to 104lines per second are achieved without degradation in the resolution. If the photocurrent generated by different monochromatic pulsed channels is readout directly, the information is demultiplexed. Results show that it is possible to decode the information from three simultaneous color channels at bit rates per channel higher than 4000 bps. Finally, when triggered by an appropriated wavelength, it can amplify or suppress the generated photocurrent working as an optical amplifier. Electrical models are present to support the sensing methodologies.
Thermal Evolution of Compound Nanoparticles on Moulds Machined by Focused-Ion-Beam for Micro/Nano Lithography
Authors: Hu Qin
Published: July 2012

Focused-ion-beam (FIB) milling is a modern fabrication technique by using focused energetic ions to ablate material and generate features with nanometer resolution. FIB system with Ga ion source was used in our lab to make moulds for laser-based micro/nano lithography. For FIB milling on glassy carbon, particles in the range of tens of nanometers up to 400 nm can often be found around the area subject to milling, with the composition of carbon and gallium. As the laser-based micro/nano lithography involves thermal process, it is important to identify the dynamic process of those compound nanoparticles during heat treatment. Glassy carbon moulds after FIB milling have been heated in air from room temperature up to 550 oC with temperature ramp rate of 10 oC/min. Scanning Electron Microscope (SEM) was used to record the morphology of the machined surface after heat treatments. Energy dispersive X-ray spectroscopy (EDS) was used for elemental analysis. Particles increase their size before the heating temperature reaches 200 oC. With further temperature increase, new particles nucleate, and grow at the neighbouring of the existing particles via coalescence and Ostwald ripening. When the temperature is over 400 oC, the morphology of nanoparticles changes, due to the evaporation of gallium. When the in air heating reaches 525 oC, cracking starts on the surface of glassy carbon. It is suggested that for in air lithographic application, heating temperature should not exceed 500 oC.
Processing of Swnt-Reinforced Yttria Stabilized Zirconia by Spark Plasma Sintering and Microstructure Characterization
Authors: de Bernardi-Martín S. , Poyato R. , Gómez-García Diego , Domínguez-Rodríguez Arturo
Published: July 2012

Single wall carbon nanotube reinforced yttria stabilized zirconia ceramic materials have been obtained by means of spark plasma sintering technique. Single wall carbon nanotubes were treated in an acid solution before mixing with zirconia powders to obtain a uniform distribution of both powders. This method allows obtaining ceramic materials with a grain size between 200 nanometers and 1 micron and with a grain size distribution which depends on processing conditions. This new route opens a new perspective for new ceramic composites tailoring with enhanced mechanical properties as structural materials
Structural, Electronic and Optical Properties of SiC Quantum Dots
Authors: Wang Jian Guang , Kroll Peter
Published: July 2012

We Perform Density Functional Theory Calculations of the Hydrogen-Passivated Topological Silicon Carbide Quantum Dots (QDs) and Investigate their Structural, Electronic and Optical Properties. We Study Clusters Constructed from 3C-Sic with up to 8 Topological Shells, Corresponding to Diameters up to 2.2 Nm, Terminated Homogeneously with either Si-H or C-H Bonds. All Qds Exhibit Tensile Strain (1-5 %) within the Cluster Core. the Larger the Cluster, the Smaller the Strain in the Interior, however. Tensile Strain Increases from the inside of the Cluster towards the outside, Reaches a Maximum at the Second Layer below the Surface, and Vanishes only for Bonds Involving Surface Si or C Atoms. Quantum-Confinement Effects Are Observed for the Energy Gaps and Optical Gaps of SiC QDs. Size Has a Major Impact on the Absorption Edge in Comparison to a Weak Effect on the Photon Energy of the Spectra Maxima. Our Calculations Show that Surface Termination Plays a Crucial Role and Strongly Affects Energy Gaps, Optical Gaps and Optical Spectra. Orbitals around the HOMO-LUMO Gap Predominantly Localize within the Core of the Cluster, with Significant Contributions by the Surface for Si-H Terminated Clusters only.