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Chitosan microspheres were prepared by ion induction and chemical cross-linking using water as the medium. Natural rubber/chitosan microsphere blends were then prepared by blending the chitosan microsphere suspension with natural rubber latex. An infrared spectrometer, particle size analyser, scanning electron microscope, surface contact angle analyser, thermogravimetric analyser, and differential...
Gd2O3:Er3+,Yb3+ microcrystals were prepared by the co-precipitation method using water or ethanol/water as solvents. The effects of solvents on particle size, morphology, and photoluminescence intensity were investigated. The microcrystal were systematically characterized by X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC), scanning electron microscope (SEM), Fourier...
Highly pure (K, Na)NbO3 lead-free piezoelectric ceramic powders have been successfully synthesized by solvothermal treatment at 220°C for 10 h using distilled water, ethanol, glycol or isopropanol as the solvent. The powders were characterized using X-ray powder diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning...
In this study the electrospinning technique was used to prepare biocompatible polyurethane membranes. The polyurethane for preparation of nanofibers was synthesized from hexamethylenediisocyanate (HDI), polytetramethylene ether glycol (PTMEG) and butanediol (BD) filled with different proportion of hydroxypropyl cellulose (HPC), by polyaddition in dimethylformamide (DMF) as solvent. Molar ratio of...
Graphene, as a rising star in material science, has recently attracted extensive scientific and technological interest owing to its strictly two-dimensional structure and extraordinary electronic, thermal and mechanical properties [1-3]. Chemical approaches, as a low cost method, could produce large-scale production of graphene, which will speed up the application of graphene. In this paper, graphene...
Fast dissolution nanofiber membranes were prepared using electrospinning process with Ferulic Acid (FA)--a traditional Chinese medicine as the active pharmaceutical ingredients and a pharmaceutical hydrophilic polymer--polyvinylpyrrolidone K30 as the filament-forming matrix. Field Emission Scanning Electronic Microscopy (FE-SEM), Differential Scanning Calorimetry (DSC), Attenuated Total Reflection...
A kind of form-stable phase change material (PCM) based on capric-lauric acid eutectic acting as the heat-absorbing material and nano silicon dioxide serving as the supportive material was prepared by sol-gel method. The optimal proportion of the capric-lauric acid eutectic in the composite was determined as 60 wt.%. By the effect of capillarity and hydrogen bonding, fatty acid eutectic can be immobilized...
A new vanadium-glycine complex (NH4V(Gly)3(PO4)2ldrH2O) was synthesized in hydrothermal condition and characterized by XRD, FTIR, SEM and TG-DSC techniques. The results indicate that glycine and water exist in the crystal framework as ligand coordinating with vanadium. The SEM images show that the single crystals are homogeneous in crystal size and shape, and show a good crystalline performance. The...
The goal of this study was to evaluate the technological feasibility of delivering poorly water-soluble antibacterial agent using chitosan coated alginate/gelatin microspheres. The microspheres were prepared by an emulsification technique, characterized by Fourier transform infrared spectrophotometry (FT-IR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM). Drug loading,...
An intercalation nonlinear-optical (NLO) polyimide was synthesized by the ring-opening polyaddition of 4,4'-(Hexafluoroisopropylidene) diphthalic Anhydride (6FDA) and [(6-nitrobenzothiazol-2- yl)diazenyl]phenyl-1,3-diamine. Then, sol-gel technique was adopted, utilizing 3- aminopropyltriethoxysi- lane (APTES) and tetraethoxysilane (TEOS). The polyimide/silica hybrid material was obtained. The polyimide...
A series of the polyimide-silica NLO nanohybrid materials were synthesized from 3,3', 4,4'- Bisphenyltetracarboxylic (BPDA), 2,2-Bis(3-amino-4-hydroxyphen-yl) hexafluoropropane (6FHP), nonlinear optical (NLO) molecule 4-(N-2-Hydroxyethyl-N-methylamino)-4'-[(6-nitroben-zothiazol-2-yl)-diazenyl] azobenzene (HNBDA), coupling agent APTES and hydrolysate of TEOS via sol-gel process. The TEOS contents in...
In the present work an attempt has been made to study the effects of ionizing radiation such as X-ray irradiation on the electrical properties of solid insulating materials such as FR4 laminates and relate these to concurrent changes in the physical and chemical properties of the above material. FR4 laminates find extensive use as an insulating material in PCB's where HV power supply components are...
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