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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...
Polyetherimide (PEI) ultrafiltration membranes were surface modified using crystalline PPSU polymer additive through thermal-induced phase inversion method. The pure and blend membranes were characterized in terms of differential scanning calorimetry, morphology and pure water flux. The effects of polymer concentration and blending ratio on membrane structure and properties were investigated. The...
To improve the mechanical strength of cellulose acetate (CA) membranes, porous inorganic/organic hybrid membranes were prepared via phase inversion technique from casting solution composed of cellulose acetate propionate (CAP), poly(vinylidene fluoride) (PVDF), mesoporous SBA-15 materials, and N-methyl-2-pyrrolidone (NMP). The effects of PVDF content and modification with SBA-15 on membranes structure,...
In this study, cellulose acetate propionate (CAP) and polyvinylidene fluoride (PVDF) were selected to prepare porous-blend membrane by wet phase inversion method. The effect of the CAP and PVDF concentration of the casting solution on membrane morphology structure and thermal stability was investigated by scanning electron microscopy (SEM) and thermal gravimetry/differential scanning calorimetry (TGA/DSC)...
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...
This paper introduces an array of single crystal silicon micro hotplates for differential scanning calorimetry. Based on heat transfer analysis considering tradeoffs between response time, temperature uniformity, and measurement sensitivity, suspended membrane micro hotplates with full backside release were found to be optimal designs. Due to the requirements of routine sample loading, the size of...
The ability of N-(4-carboxyphenyl) maleimide to act as a very effective and stable complexation agent for several transition metal ions, such as cobalt (II), copper (II), nickel (II), has been demonstrated. Polymer blends composed of poly(vinylidene difluoride) and some of the resulting metal complexes of N-(4-carboxyphenyl)maleimide were prepared by using solution casting technique. The resulting...
The proton conductivity of chemically cross-linked composite membranes consisting of poly(vinyl alcohol) (PVA) and silicotungstic acid (STA) prepared by solution casting as proton-conducting polymer electrolytes was investigated as a function of blending composition, cross-linking density, and temperature. The conductivity mechanism was investigated by using Impedance spectroscopy in the region between...
A nanocalorimeter is presented consisting of a silicon chip with germanium thermistors. Thermistors patterned on a silicon nitride membrane provide highly sensitive thermal measurements. Differential measurements can be performed by comparison with thermistors patterned on the bulk- silicon. Temperature scanning measurements enable to determine the phase transition temperatures(Tm) of various phase-change...
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