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Title: Thermoreversible Gels Composed of Colloidal Silica Rods with Short-Range Attractions

Abstract

Dynamic arrest transitions of colloidal suspensions containing non-spherical particles are of interest for the design and processing of various particle technologies. To better understand the effects of particle shape anisotropy and attraction strength on gel and glass formation, we present a colloidal model system of octadecyl-coated silica rods, termed as adhesive hard rods (AHR), which enables control of rod aspect ratio and temperature-dependent interactions. The aspect ratios of silica rods were controlled by varying the initial TEOS concentration following the work of Kuijk et al. (J. Am. Chem. Soc., 2011, 133, 2346–2349) and temperature-dependent attractions were introduced by coating the calcined silica rods with an octadecyl-brush and suspending in tetradecane. The rod length and aspect ratio were found to increase with TEOS concentration as expected, while other properties such as the rod diameter, coating coverage, density, and surface roughness were nearly independent of the aspect ratio. Ultra-small angle X-ray scattering measurements revealed temperature-dependent attractions between octadecyl-coated silica rods in tetradecane, as characterized by a low-q upturn in the scattered intensity upon thermal quenching. Lastly, the rheology of a concentrated AHR suspension in tetradecane demonstrated thermoreversible gelation behavior, displaying a nearly 5 orders of magnitude change in the dynamic moduli asmore » the temperature was cycled between 15 and 40 °C. We find the adhesive hard rod model system serves as a tunable platform to explore the combined influence of particle shape anisotropy and attraction strength on the dynamic arrest transitions in colloidal suspensions with thermoreversible, short-range attractions.« less

Authors:
 [1];  [2];  [1]
  1. Univ. of Delaware, Newark, DE (United States). Center for Molecular and Engineering Thermodynamics & Center for Neutron Science, Dept. of Chemical and Biomolecular Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC); National Institute of Standards and Technology (NIST)
OSTI Identifier:
1334434
Grant/Contract Number:  
AC05-00OR22725; AC02-06CH11357; DMR- 052054
Resource Type:
Accepted Manuscript
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 32; Journal Issue: 33; Journal ID: ISSN 0743-7463
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Murphy, Ryan P., Hong, Kunlun, and Wagner, Norman J. Thermoreversible Gels Composed of Colloidal Silica Rods with Short-Range Attractions. United States: N. p., 2016. Web. https://doi.org/10.1021/acs.langmuir.6b02107.
Murphy, Ryan P., Hong, Kunlun, & Wagner, Norman J. Thermoreversible Gels Composed of Colloidal Silica Rods with Short-Range Attractions. United States. https://doi.org/10.1021/acs.langmuir.6b02107
Murphy, Ryan P., Hong, Kunlun, and Wagner, Norman J. Thu . "Thermoreversible Gels Composed of Colloidal Silica Rods with Short-Range Attractions". United States. https://doi.org/10.1021/acs.langmuir.6b02107. https://www.osti.gov/servlets/purl/1334434.
@article{osti_1334434,
title = {Thermoreversible Gels Composed of Colloidal Silica Rods with Short-Range Attractions},
author = {Murphy, Ryan P. and Hong, Kunlun and Wagner, Norman J.},
abstractNote = {Dynamic arrest transitions of colloidal suspensions containing non-spherical particles are of interest for the design and processing of various particle technologies. To better understand the effects of particle shape anisotropy and attraction strength on gel and glass formation, we present a colloidal model system of octadecyl-coated silica rods, termed as adhesive hard rods (AHR), which enables control of rod aspect ratio and temperature-dependent interactions. The aspect ratios of silica rods were controlled by varying the initial TEOS concentration following the work of Kuijk et al. (J. Am. Chem. Soc., 2011, 133, 2346–2349) and temperature-dependent attractions were introduced by coating the calcined silica rods with an octadecyl-brush and suspending in tetradecane. The rod length and aspect ratio were found to increase with TEOS concentration as expected, while other properties such as the rod diameter, coating coverage, density, and surface roughness were nearly independent of the aspect ratio. Ultra-small angle X-ray scattering measurements revealed temperature-dependent attractions between octadecyl-coated silica rods in tetradecane, as characterized by a low-q upturn in the scattered intensity upon thermal quenching. Lastly, the rheology of a concentrated AHR suspension in tetradecane demonstrated thermoreversible gelation behavior, displaying a nearly 5 orders of magnitude change in the dynamic moduli as the temperature was cycled between 15 and 40 °C. We find the adhesive hard rod model system serves as a tunable platform to explore the combined influence of particle shape anisotropy and attraction strength on the dynamic arrest transitions in colloidal suspensions with thermoreversible, short-range attractions.},
doi = {10.1021/acs.langmuir.6b02107},
journal = {Langmuir},
number = 33,
volume = 32,
place = {United States},
year = {2016},
month = {7}
}

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