The synthesis of the steroidal imidazole and nickel molybdate based composite membrane is described. The fabricated composite material was characterized by using FT-IR, XRD, PSA and SEM and has been investigated for its functional, diffusive, structural, electrical and optical properties. The SEM showed that membrane has random non-preferential orientation with no visible cracks and appeared to be composed of dense and loose aggregation of small particles. No impurity peak was observed in the XRD pattern showing the single phase composite formation. The IR spectra showed the characteristic absorption peaks of different functional groups present in the composite. It was observed that real impedance decreased with the increase in frequency while AC conductivity gradually increased with the increase in frequency of applied AC due to hopping phenomenon. It was also confirmed that with the increase in frequency, the dielectric constant decreased and became almost constant at high frequencies for both compositions. The UV-vis spectrum of the synthesized composite indicate band gap energy of about 3.1 eV showing a weak blue shift compared to 4.6 eV for the bulk. Due to their optical and electrical properties, nano phase composite is promising candidate for use as selectivity of different cations.
*Corresponding Authors: Ayaz Mahmood Dar
In this work polystyrene based strontium phosphate membranes (SPMs) were prepared by applying different pressures. The membrane potential is measured with uni-univalent electrolytes (KCl, NaCl, and LiCl) solutions using saturated calomel electrodes (SCEs). The effective fixed charge density of these membranes is determined by the Torell, Meyer and Sievers method and it showed the dependence of membrane potential on the porosity, the charge on the membrane matrix, charge and size of permeating ions. The membranes are characterized by X-ray diffraction, scanning electron microscopy and IR spectroscopy. The order of surface charge density for electrolytes is KCl > NaCl > LiCl. Other parameters such as transport number, distribution coefficient, charge effectiveness and related parameters are calculated. The membrane was found to be mechanically stable, and can be operated over a wide pH range.
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