Stabilization of a Highly Concentrated Colloidal Suspension of Pristine Metallic Nanoparticles

Journal article


Kumar, N., Biswas, K., Tiwary, C.S., Machado, L.D. and Gupta, R.K. (2019). Stabilization of a Highly Concentrated Colloidal Suspension of Pristine Metallic Nanoparticles. Langmuir. 35 (7), pp. 2668-2673. https://doi.org/10.1021/acs.langmuir.8b03401
AuthorsKumar, N., Biswas, K., Tiwary, C.S., Machado, L.D. and Gupta, R.K.
Abstract

A colloidal suspension containing a high concentration of metallic nanoparticles (NPs) finds potential applications in flexible electronic printing, nanofluids, healthcare, antifouling coating, and so on. Here, we demonstrate a generic, easily scalable, simple, and contamination-free cryogenic temperature grinding method, which can effectively be used to prepare pristine NPs that can be stabilized in polar liquids in high concentrations. These surfactant-free pristine NPs have been found to remain dispersed in different polar liquids (CH3OH, C2H5OH, glycol, etc.) for weeks. The long-term stability of the NPs in these liquids has been investigated using zeta potential, in situ Fourier transform infrared spectroscopy, indicating electrostatic stabilization for ultrapure, surfactant-free NPs. Furthermore, stabilization of the NPs has been probed with detailed calculations using the Derjaguin Landau Verwey Overbeek theory as well as atomistic molecular dynamics simulation (MD). Experimental measurements along with theoretical calculations categorically indicate that the electrostatic energy is helping these NPs to be stabilized in a polar liquid.

Year2019
JournalLangmuir
Journal citation35 (7), pp. 2668-2673
PublisherAmerican Chemical Society (ACS)
ISSN0743-7463
Digital Object Identifier (DOI)https://doi.org/10.1021/acs.langmuir.8b03401
Publication dates
Print19 Feb 2019
Online24 Jan 2019
Publication process dates
Accepted20 Dec 2018
Deposited02 Feb 2021
Accepted author manuscript
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Open
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