SK Chakarvarti

MRIU, RESEARCH & DEVELOPMENT, Emeritus

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Former Pofessor and Dean Academic at National Institute of Technology,Kurukshetra,India

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PROF. OM PRAKASH SINHA

Amity University

David Seamon

Kansas State University

Professor Dr Christopher Preece

Abu Dhabi University

Rashid I Zainetdinov

Moscow State University of Railway Engineering (MIIT)

Prof.Dr. İbrahim USLU

Gazi University

Kenneth Vecchio

University of California, San Diego

Khaled Dine

University of Dr moulay taher

Franz Giessibl

University of Regensburg

Gabriela Dutrénit

Universidad Autónoma Metropolitana-Xochimilco

Jerzy W Rozenblit

The University of Arizona

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Papers by SK Chakarvarti

Investigation of Ionic Transport Through Track-Etched Conical Nanopores of PET Membrane

Nano, 2018

The control of ionic transportation inside the multi asymmetric conical nanopores in polyethylene... more The control of ionic transportation inside the multi asymmetric conical nanopores in polyethylene terephthalate (PET) membrane was investigated. The conical nanopores were prepared by chemical etching in irradiated PET foil using etchant (9 M NaOH) and stopping solution (1 M NaCl [Formula: see text] 1 M HCOOH). The behavior of ionic current was recorded under stepping voltage [Formula: see text]2[Formula: see text]V to [Formula: see text]2[Formula: see text]V at different molar concentrations of potassium halides (KCl, KBr and KI) under symmetric bathing condition in electrochemical cell. It is found that the presence of multiple ionic species and the occurrence of counterion condensation of charge regulated polyelectrolyte play an effective role in ionic current rectification (ICR). The electrical conductance of conical nanopores may be estimated by measuring the ionic current rectification properties of track-etched nanopores. The charge transport properties vary with molar concen...

Synthesis of Microwires of Polypyrrole via Chemical Polymerization using Track Etch Membrane as Template

American Journal of Materials Science and Technology, 2014

Low dimensional structures of conducting polymers, particularly polypyrrole, have attracted a gre... more Low dimensional structures of conducting polymers, particularly polypyrrole, have attracted a great attention of researchers and engineers in recent years because of their diverse potential application on account of their unique properties of large aspect ratio, good electrical conductivity, environmental stability and biocompatibility. The present work describes synthesis of polypyrolle microwires by template assisted chemical polymerization at room temperature using FeCl3 as an oxidant. In this technique, the track etch membrane used as a template was fitted between two chambers in a chemical cell in such a way that the template acts as a separating wall between the chambers. One chamber was filled with an aqueous monomer pyrrole solution and other was filled with oxidant reagent of ferric chloride. Chemical polymerization takes place within the pores of the template as the monomer and the oxidant reagent diffuse towards each other, react to yield the conductive polymer which grows as microstructure in the shape of pores of host template. Synthesized samples have been characterized by Scanning Electron Microscopy (SEM), which reveals that the morphology of the microwires matches with the morphology of pores as mould in host template. Diameter, orientation and direction of growth of microwires were almost uniform because of the confined growth of microwires in the ordered and symmetric pores of TEM template. Conductivity of polypyrrole microwires was estimated equal 20.152 S/m form current-voltage characteristics measured using a two-probe-method.

SK Chakarvarti

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