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Arsalan M.,Membrane Research Laboratory | Imteyaz S.,Membrane Research Laboratory | Zeeshan M.,Analytical and Polymer Research Laboratory | Rafiuddin,Membrane Research Laboratory
Desalination and Water Treatment | Year: 2015

PVC-supported strontium tungstate composite membrane was prepared by the cast die frame of membrane preparation. The strontium tungstate material was qualitatively synthesized by sol-gel method of material synthesis. The membrane was characterized by SEM, XRD, FTIR, and simultaneous TGA/DTA studies. These characterizations demonstrated the material nature, functional groups, surface texture, porosity, thermal stability, ion-exchange property etc. The electrochemical properties have been studied by TMS theoretical approach which easily determines the important parameters of membranes like transport number, mobility ratio, charge density, charge effectiveness etc. The theoretical and observed electrolyte potential calculations get the values of charge density. The observed ionic potential and graphical fixed-charge density of both the membranes follows CaCl2 < MgCl2 < BeCl2 and CaCl2 > MgCl2 > BeCl2 order, respectively. © 2015 Balaban Desalination Publications. All rights reserved. Source


Arsalan M.,Membrane Research Laboratory | Zeeshan M.,Analytical and Polymer Research Laboratory
Journal of Molecular Structure | Year: 2015

PVC incorporated ZT/ZM composite materials have been synthesized via qualitative sol-gel method of material synthesis. Both the composite materials have the combination of inorganic ion-exchanger of different metal salt as well as same organic polymers, which is used to design a new class of organic-inorganic composite ion exchange membrane with much better chemical and mechanical properties, good ion-exchange capacity, higher thermal stability, reproducibility, selectivity etc. The physicochemical, electrochemical, mechanical and thermal properties of both the membranes were characterized by SEM, XRD, FTIR and simultaneous TGA-DTA studies were carried out to understand the ion exchange behavior of materials. The above analysis demonstrated the functional groups, material nature, thermal stability, surface structure, porosity, elemental percentages, ion transportation etc. The electrochemical properties have been studied by TMS theoretical approach which easily determined the important parameters of membranes like transport number, mobility ratio, charge density, charge effectiveness etc. The observed ionic potential and graphical fixed-charge density of both the membranes follows KCl < NaCl < LiCl and KCl > NaCl > LiCl order respectively. © 2015 Published by Elsevier B.V. Source


Khan A.A.,Analytical and Polymer Research Laboratory | Khalid M.,Analytical and Polymer Research Laboratory
Synthetic Metals | Year: 2010

Conductive fibers based on polyaniline (PANI) and polyacrylonitrile (PAN) were obtained by stirring with magnetic bar. This research was conducted to investigate conducting fibers of polyaniline:polyacrylonitrile (PANI:PAN) composite with different weight ratios of aniline in PAN matrix. The fibers were prepared by stirring process. The best conductivity behavior of the fibers was obtained with 5 mL of aniline. The fibers obtained were characterized using Fourier-transform infrared spectra (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The variation of electrical conductivity with different type doping agents (HCl, H2SO4 and HClO4) and the stability in terms of DC electrical conductivity retention was studied in an oxidative environment by isothermal characteristics. © 2010 Elsevier B.V. All rights reserved. Source


Khan A.A.,Analytical and Polymer Research Laboratory | Khalid M.,Analytical and Polymer Research Laboratory
Journal of Applied Polymer Science | Year: 2010

Nano-sized particles of Zinc oxide (ZnO) were synthesized using a new chemical rout. The chemical oxidative polymerization of aniline in the presence of nano ZnO was employed to synthesize a polyaniline-zinc oxide (PANI-ZnO) nanocomposite. The material was characterized by using transmission electron microscopy, XRD, scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), and Thermogravimetric analysis (TGA). The conductivity measurements showed the resulting composites possessed higher conductivity as compared to pure polyaniline (PANI). The nanocomposite exhibited fairly sensitivetowards solution of aqueous ammonia (NH3), when it was exposed to various concentrations of NH3 in an ambient room temperature. The results show that the sensor has good sensitivity and good repeatability upon repeated exposure to NH3. PANI-ZnO nanocomposite was also used to study electrical conductivity under isothermal conditions in the temperature range 50-130°C. The composite was found stable under ambient conditions below 90°C in terms of DC electrical conductivity retention. © 2010 Wiley Periodicals, Inc. Source

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