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Title: Micelle-induced depletion interaction and resultant structure in charged colloidal nanoparticle system

Abstract

The evolution of the interaction and the resultant structure in the mixed system of anionic silica nanoparticles (Ludox LS30) and non-ionic surfactant decaethylene glycol monododecylether (C12E10), undergoing phase separation, have been studied using small-angle neutron scattering and dynamic light scattering. The measurements have been carried out for a fixed concentration of nanoparticle (1 wt. %) with varying concentration of surfactant (0 to 1 wt. %), in the absence and presence of an electrolyte. It is found that the micelles of non-ionic surfactant adsorb on the nanoparticle in the absence of electrolyte (form stable system), whereas these micelles become non-adsorbing in the presence of electrolyte (show phase separation). The phase separation arises because of C12E10 micelles, causing depletion interaction between nanoparticles and leading to their aggregation. The interaction is modeled by double Yukawa potential accounting for attractive depletion as well as repulsive electrostatic forces. Both the interactions (attraction and repulsion) are found to be of long-range. The nanoparticle aggregation (phase separation) is governed by the increase in the magnitude and the range of the depletion attraction with the increase in the surfactant concentration. The nanoparticle aggregates formed are quite large in size (order of micron) and are characterized by the surface fractal having simple cubicmore » packing of nanoparticles within the aggregates.« less

Authors:
;  [1]
  1. Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 PSI Villigen (Switzerland)
Publication Date:
OSTI Identifier:
22402937
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AGGLOMERATION; COLLOIDS; CONCENTRATION RATIO; ELECTROLYTES; FRACTALS; LIGHT SCATTERING; NANOPARTICLES; NEUTRON DIFFRACTION; SILICA; SMALL ANGLE SCATTERING; SURFACES; SURFACTANTS; YUKAWA POTENTIAL

Citation Formats

Ray, D., Aswal, V. K., E-mail: vkaswal@barc.gov.in, and Kohlbrecher, J. Micelle-induced depletion interaction and resultant structure in charged colloidal nanoparticle system. United States: N. p., 2015. Web. doi:10.1063/1.4919359.
Ray, D., Aswal, V. K., E-mail: vkaswal@barc.gov.in, & Kohlbrecher, J. Micelle-induced depletion interaction and resultant structure in charged colloidal nanoparticle system. United States. https://doi.org/10.1063/1.4919359
Ray, D., Aswal, V. K., E-mail: vkaswal@barc.gov.in, and Kohlbrecher, J. 2015. "Micelle-induced depletion interaction and resultant structure in charged colloidal nanoparticle system". United States. https://doi.org/10.1063/1.4919359.
@article{osti_22402937,
title = {Micelle-induced depletion interaction and resultant structure in charged colloidal nanoparticle system},
author = {Ray, D. and Aswal, V. K., E-mail: vkaswal@barc.gov.in and Kohlbrecher, J.},
abstractNote = {The evolution of the interaction and the resultant structure in the mixed system of anionic silica nanoparticles (Ludox LS30) and non-ionic surfactant decaethylene glycol monododecylether (C12E10), undergoing phase separation, have been studied using small-angle neutron scattering and dynamic light scattering. The measurements have been carried out for a fixed concentration of nanoparticle (1 wt. %) with varying concentration of surfactant (0 to 1 wt. %), in the absence and presence of an electrolyte. It is found that the micelles of non-ionic surfactant adsorb on the nanoparticle in the absence of electrolyte (form stable system), whereas these micelles become non-adsorbing in the presence of electrolyte (show phase separation). The phase separation arises because of C12E10 micelles, causing depletion interaction between nanoparticles and leading to their aggregation. The interaction is modeled by double Yukawa potential accounting for attractive depletion as well as repulsive electrostatic forces. Both the interactions (attraction and repulsion) are found to be of long-range. The nanoparticle aggregation (phase separation) is governed by the increase in the magnitude and the range of the depletion attraction with the increase in the surfactant concentration. The nanoparticle aggregates formed are quite large in size (order of micron) and are characterized by the surface fractal having simple cubic packing of nanoparticles within the aggregates.},
doi = {10.1063/1.4919359},
url = {https://www.osti.gov/biblio/22402937}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 16,
volume = 117,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 2015},
month = {Tue Apr 28 00:00:00 EDT 2015}
}