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Synthesis of self-assembled siloxane–polyindole–gold nanoparticle polymeric nanofluid for biomedical membranes

Published online by Cambridge University Press:  29 June 2020

Prem C. Pandey
Department of Chemistry, Indian Institute of Technology (BHU), Varanasi221005, India
Naman Katyal
Department of Chemistry, Indian Institute of Technology (BHU), Varanasi221005, India
Govind Pandey
Department of Pediatrics, King George Medical University, Lucknow226003, India
Roger J. Narayan*
Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC27599-7115, USA
Address all correspondence to Roger J. Narayan at
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In this paper, the Lewis base character of 3-aminopropyltrimethoxysilane (3-APTMS), an imine derivative of siloxane, and an indole monomer were shown to enable the reduction of gold cations in acetone. The Lewis acid–base adduct of indole monomers and gold formed a polyindole–gold nanoparticle sol. Similarly, the Lewis acid–base adduct of 3-APTMS and gold enabled the formation of gold nanoparticles in the presence of acetone. The polyindole–gold nanoparticle sol and siloxane–gold nanoparticles underwent self-assembly into a polymeric nanofluid that was suitable for casting membranes. The use of these membranes as a potentiometric ion sensor for both cations and anions was considered; a common nonspecific ion exchange molecule, sodium tetraphenylborate, and the polymeric nanofluid were used to prepare an anion sensor and a cation sensor.

Research Letters
Copyright © Materials Research Society, 2020

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