Preparation of anisotropic silica nanoparticles via one-dimensional assembly of presynthesized spherical seeds

Junzheng Wang*, Ayae Sugawara-Narutaki, Atsushi Shimojima, Tatsuya Okubo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This presentation describes a facile solution process for the preparation of anisotropic silica nanoparticles (ASNPs). ASNPs are prepared via one-dimensional assembly of spherical silica seeds (22 nm) in alcohol-water mixed media, followed by their in situ fixation and overgrowth with tetraethoxysilane (TEOS). Ethanol and L-arginine (Arg) are used to modify the dielectric constant and ionic strength of the reaction media, by which silica seed assembly is controlled through the adjustment of electrostatic interaction. Ethanol and Arg also serve as cosolvent and catalyst for hydrolysis and condensation of TEOS, respectively, which enables us to produce ASNPs in a simple one-pot process. In addition to ASNPs with wormlike structures, different kinds of NPs (bimodal spherical NPs, monodisperse spherical NPs, and spherical aggregates) have also been obtained by changing the concentrations of ethanol and Arg. The length, thickness, or both of ASNPs are controlled systematically by varying the concentrations of Arg, seed NPs, and TEOS. Other alcoholic cosolvents, such as methanol, 1-propanol, 2-propanol, and t-butanol, are also effective to give ASNPs when the dielectric constant of the alcohol-water mixed media is properly adjusted, showing the versatility of the present method.

Original languageEnglish
Title of host publication11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings
Publication statusPublished - 2011 Dec 1
Externally publishedYes
Event2011 AIChE Annual Meeting, 11AIChE - Minneapolis, MN, United States
Duration: 2011 Oct 162011 Oct 21

Publication series

Name11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings


Conference2011 AIChE Annual Meeting, 11AIChE
Country/TerritoryUnited States
CityMinneapolis, MN

ASJC Scopus subject areas

  • Chemical Engineering(all)


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