Self-assembly of supermicro- and meso-porous silica and silica/gold nanoparticles using double-chained surfactants

Robert I. Nooney, Dhanasekaran Thirunavukkarasu, Agnes E. Ostafin, Yimei Chen, Robert Josephs

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Porous silica nanosized particles were prepared using tetramethylorthosilicate and two double carbon chained templates, n-didodecyldimethylammonium bromide and n-didodecyldimethylammonium bromide. Samples were prepared using a simple modification of the Stöber method for synthesis of colloidal silica for template to silica ratios of 0.2 and 0.1 under homogeneous cosolvent conditions. Silica/gold nanocomposites were prepared similarly except for the addition of a gold colloid suspension prior to self-assembly. All samples were analyzed using X-ray diffraction, transmission electron microscopy and liquid nitrogen adsorption. The diameters of the pores were measured using three methods: volumetric-XRD; Gurvitsch; and BJH. The diameters of the pores ranged from 1.9 to 2.5 nm using the Volumetric-XRD method with pore wall diameters from 0.64 to 1.1 nm. The presence of super-micro- and meso-pores were confirmed using comparison t-plots. Both the volumetric-XRD and Gurvitsch methods were consistent with the t-plot analysis, whereas the BJH method underestimated pore diameters significantly. Samples had pore volumes in excess of 0.37cm g-1 at STP and surface areas greater than 700m 2g-1. The symmetry of the silica pore structure was found to vary depending on both the template to silica ratio and the addition of a gold tag. The diameter of nanoparticles ranged from 58 to 590 nm and the position of the gold seed in each particle was consistent with a three-stage aggregative growth model.

Original languageEnglish
Pages (from-to)183-193
Number of pages11
JournalMicroporous and Mesoporous Materials
Volume75
Issue number3
DOIs
Publication statusPublished - 2 Nov 2004
Externally publishedYes

Fingerprint

Surface-Active Agents
Silicon Dioxide
Gold
Self assembly
self assembly
Surface active agents
surfactants
Silica
gold
Nanoparticles
silicon dioxide
porosity
nanoparticles
templates
bromides
Gold Colloid
plots
Liquid nitrogen
Pore structure
Colloids

Keywords

  • Mesoporous silica
  • Self-assembly
  • Silica nanoparticles
  • Super microporous silica
  • Surfactant templated silica

ASJC Scopus subject areas

  • Catalysis
  • Materials Science(all)

Cite this

Self-assembly of supermicro- and meso-porous silica and silica/gold nanoparticles using double-chained surfactants. / Nooney, Robert I.; Thirunavukkarasu, Dhanasekaran; Ostafin, Agnes E.; Chen, Yimei; Josephs, Robert.

In: Microporous and Mesoporous Materials, Vol. 75, No. 3, 02.11.2004, p. 183-193.

Research output: Contribution to journalArticle

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