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

Murphy, Ryan P.; Hong, Kunlun; Wagner, Norman J.

doi:10.1016/j.jcis.2017.04.026

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

Journal Article · Fri Sep 01 00:00:00 EDT 2017 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1016/j.jcis.2017.04.026· OSTI ID:1361329

Murphy, Ryan P. ^[1]; Hong, Kunlun ^[2]; Wagner, Norman J. ^[1]

Univ. of Delaware, Newark, DE (United States)
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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1361329

Alternate ID(s):: OSTI ID: 1414796
OSTI ID: 1372929

Journal Information:: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Vol. 501; ISSN 0021-9797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Bioinspired process using anisotropic silica particles and fatty acid for superhydrophobic cotton fabrics Patil, Namrata V.; Netravali, Anil N. Cellulose, Vol. 27, Issue 1 https://doi.org/10.1007/s10570-019-02811-4	journal	October 2019
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