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Title: Synthetic control of the size, shape, and polydispersity of anisotropic silica colloids

Journal Article · · Journal of Colloid and Interface Science
 [1];  [2];  [1]
  1. Univ. of Delaware, Newark, DE (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The particle size and shape determine the microstructure and rheological properties of colloidal suspensions. This work aims to further control the size, shape, and polydispersity of anisotropic silica colloids, to reduce particle size, and to provide additional mechanistic insights on a prevalent, water-in-oil emulsion synthesis method. Key findings show that the dimensions of anisotropic silica particles can be systematically varied by approximately fivefold, with a limiting minimum particle size (D ≈ 60 nm, L ≈ 300 nm) obtained from emulsions with excess polyvinylpyrrolidone (PVP) and sodium citrate. The synthesis conditions are identified and discussed for which the emulsion composition, temperature, sonication, polymer entanglements, mixing, and other perturbations may induce or mitigate emulsion instabilities, citrate precipitation, a competing mechanism of templated growth, termination of anisotropic growth, irregular silica structures, and fiber formation. An improved mechanistic understanding will expand the roadmap for rational design and synthetic control of anisotropic colloids using sol-gel silica chemistry confined within water-in-oil emulsions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1361329
Alternate ID(s):
OSTI ID: 1414796
Journal Information:
Journal of Colloid and Interface Science, Vol. 501; ISSN 0021-9797
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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  • Zafarani-Moattar, Mohammed Taghi; Banisaeid, Sepideh; Shamsi Beirami, Mohammad Ali
  • Journal of Chemical & Engineering Data, Vol. 50, Issue 4 https://doi.org/10.1021/je050086h
journal May 2005
Role of chain entanglements on fiber formation during electrospinning of polymer solutions: good solvent, non-specific polymer–polymer interaction limit journal April 2005

Cited By (4)

Bioinspired process using anisotropic silica particles and fatty acid for superhydrophobic cotton fabrics journal October 2019
Dynamic arrest of adhesive hard rod dispersions journal January 2020
Solution-Phase Synthesis of Silica Fibers and Their Use in Making Transparent High-Strength Silica-Polymer Composites journal December 2018
Monte Carlo simulation of cylinders with short-range attractions journal September 2018

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