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

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

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

Abstract

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
Externally publishedYes
Event2011 AIChE Annual Meeting, 11AIChE - Minneapolis, MN
Duration: 2011 Oct 162011 Oct 21

Other

Other2011 AIChE Annual Meeting, 11AIChE
CityMinneapolis, MN
Period11/10/1611/10/21

Fingerprint

Silicon Dioxide
Seed
Silica
Nanoparticles
Ethanol
Propanol
Alcohols
Permittivity
Polymers
tert-Butyl Alcohol
1-Propanol
Arginine
2-Propanol
Water
Coulomb interactions
Ionic strength
Butenes
Methanol
Condensation
Hydrolysis

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Wang, J., Sugawara-Narutaki, A., Shimojima, A., & Okubo, T. (2011). Preparation of anisotropic silica nanoparticles via one-dimensional assembly of presynthesized spherical seeds. In 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings

Preparation of anisotropic silica nanoparticles via one-dimensional assembly of presynthesized spherical seeds. / Wang, Junzheng; Sugawara-Narutaki, Ayae; Shimojima, Atsushi; Okubo, Tatsuya.

11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings. 2011.

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

Wang, J, Sugawara-Narutaki, A, Shimojima, A & Okubo, T 2011, Preparation of anisotropic silica nanoparticles via one-dimensional assembly of presynthesized spherical seeds. in 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings. 2011 AIChE Annual Meeting, 11AIChE, Minneapolis, MN, 11/10/16.
Wang J, Sugawara-Narutaki A, Shimojima A, Okubo T. Preparation of anisotropic silica nanoparticles via one-dimensional assembly of presynthesized spherical seeds. In 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings. 2011
Wang, Junzheng ; Sugawara-Narutaki, Ayae ; Shimojima, Atsushi ; Okubo, Tatsuya. / Preparation of anisotropic silica nanoparticles via one-dimensional assembly of presynthesized spherical seeds. 11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings. 2011.
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