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Your search keyword '"Shah, Faiz Ullah"' showing total 15 results
Start Over Author "Shah, Faiz Ullah" Publisher elsevier bv
15 results on '"Shah, Faiz Ullah"'

3. Ionic liquids enhance electrical conductivity of greases : an impedance spectroscopy study

Author

Reddy, Akepati Bhaskar, Shah, Faiz Ullah, Leckner, Johan, Rutland, Mark W., Glavatskih, Sergei, Reddy, Akepati Bhaskar, Shah, Faiz Ullah, Leckner, Johan, Rutland, Mark W., and Glavatskih, Sergei

Abstract

Ionic liquids (ILs) have emerged as viable solutions for developing new-age lubricants, both as neat lubricants and lubricant additives. Enabled by the presence of discrete ions, ILs have the possibility to render electrically conductive lubricants, which is a feasible strategy for developing lubricant systems compatible with modern e-drive conditions. However, this requires the characterization of the electrical properties of lubricants, which is a bottleneck for developing electrically conductive greases, given their complex architecture. This work introduces an electrochemical impedance spectroscopy measurement methodology to evaluate grease samples’ electrical properties. Compared to the commonly used conductivity meters, this method, through its multi-frequency alternating current (AC) impedance approach, can effectively distinguish the individual contributions of the bulk and the sample-electrode interface to the measured electrical response. Impedance spectra of grease samples are obtained using an electrochemical cell with parallel plate electrodes, mounted on a temperature-controlled cell stand and coupled with a potentiostat. The grease's bulk conductivity is extracted by fitting the impedance data to relevant equivalent electrical circuits. The bulk conductivity of lithium complex grease doped with ILs is evaluated and compared to greases with conventional conductivity additives (copper powder and conductive carbon black). The analysis of temperature-dependent conductivity reveals the rather different conductivity mechanisms for different additives. For greases doped with ILs, a comparison against the electrical conductivity of neat ILs reveals that, in addition to the ion dissociation, the interaction of the ions with the different grease components (base oil, thickener) is crucial in defining the grease conductivity., QC 20240115

Published
2024
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6. Two structural types of dithiocarbamato-chlorido complexes of mercury(II): Preparation, supramolecular self-assembly, solid-state 13C and 15N NMR characterisation and thermal behaviour of pseudo-polymeric compounds of [Hg2(S2CNBu2)2Cl2] and [Hg4(S2CNiBu2)6][Hg2Cl6]

Author

Loseva, Olga V., primary, Rodina, Tatyana A., additional, Shah, Faiz Ullah, additional, Smolentsev, Anton I., additional, Antzutkin, Oleg N., additional, and Ivanov, Alexander V., additional

Published
2022
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8. Engineering electroactive and biocompatible tetra(aniline)-based terpolymers with tunable intrinsic antioxidant properties in vivo

Author

Mushtaq, Irrum, primary, Mushtaq, Iram, additional, Akhter, Zareen, additional, Murtaza, Iram, additional, Qamar, Samina, additional, Ayub, Sidra, additional, Mirza, Bushra, additional, Butt, Tehmeena Maryum, additional, Janjua, Naveed Kausar, additional, Shah, Faiz Ullah, additional, and Zaman, Farasat, additional

Published
2020
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