Small-Angle Neutron Scattering Study of Interplay of Attractive and Repulsive Interactions in Nanoparticle-Polymer System

Langmuir : the ACS Journal of Surfaces and Colloids
Sugam KumarJ Kohlbrecher

Abstract

The phase behavior of nanoparticle (silica)-polymer (polyethylene glycol) system without and with an electrolyte (NaCl) has been studied. It is observed that nanoparticle-polymer system behaves very differently in the presence of electrolyte. In the absence of electrolyte, the nanoparticle-polymer system remains in one-phase even at very high polymer concentrations. On the other hand, a re-entrant phase behavior is found in the presence of electrolyte, where one-phase (individual) system undergoes two-phase (nanoparticle aggregation) and then back to one-phase with increasing polymer concentration. The regime of two-phase system has been tuned by varying the electrolyte concentration. The polymer concentration range over which the two-phase system exists is significantly enhanced with the increase in the electrolyte concentration. These systems have been characterized by small-angle neutron scattering (SANS) experiments of contrast-marching the polymer to the solvent. The data are modeled using a two-Yukawa potential accounting for both attractive and repulsive parts of the interaction between nanoparticles. The phase behavior of nanoparticle-polymer system is explained by interplay of attractive (polymer-induced attractive dep...Continue Reading

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Citations

Jan 20, 2018·Physical Review. E·Sugam KumarJoachim Kohlbrecher
Jun 13, 2018·Soft Matter·Anne-Caroline Genix, Julian Oberdisse
Jan 1, 2016·Nanomaterials·Domenico LombardoMikhail A Kiselev
Dec 2, 2019·Journal of Colloid and Interface Science·I GrilloJ Combet
Aug 21, 2021·Physical Review. E·Sugam KumarVinod K Aswal
Mar 26, 2019·Biomacromolecules·Sugam KumarJoachim Kohlbrecher
Apr 20, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Sugam KumarJoachim Kohlbrecher

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