Controlled design of ordered and disordered pore architectures, geometries, and dimensions of HOM-type mesostructured monoliths and their hydrothermal stabilities

Sherif A. El-Safty, Yoshimichi Kiyozumi, Takaaki Hanaoka, Fujio Mizukami

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Nanometer-sized silica monoliths with ordered and disordered mesostructures (HOM type) were fabricated by using a simple and fast yet reproducible strategy of an instant direct-templating method of a number of nonionic n-alkyloligo(ethylene oxide), namely, Brij-type (CxEOy), and Triton- and Tween-type surfactants that have different molecular sizes and characteristics. A key feature of this design strategy is that the real control of the type of surfactant phases enabled the development of various types of surfactant/silica mesophases in ordered and disordered structures and in shape- and size-controlled cage and cylindrical pore geometries. Control over the flexibility of the formed silica/surfactant mesophases was strongly influenced by the phase composition domains, the extent of hydrocarbon solubilization, and the surfactant molecular nature (corona/core features). These key findings were the main factors for the generation of the cylindrical and cagelike pore systems with these nonionic surfactants. The fabricated 1D, 2D, and 3D structures show evidence that our design strategy could fulfill the growing demand for targeted applications and avoid the difficulties in preparing cage and cylindrical pore structures. Particularly important here was the hydrothermal stability of HOM mesostructures under boiling water (on the order of days). The hydrothermal stability of 2D and 3D HOM mesostructures was not only due to the thicker pore walls and the degree of framework cross-linkage but also due to the large morphological particle sizes of HOM monoliths. However, the formation of the large grain sizes in local HOM silica matrixes led to higher control over the dissolution of their framework during hydrothermal treatment.

Original languageEnglish
Pages (from-to)5476-5489
Number of pages14
JournalJournal of Physical Chemistry C
Volume112
Issue number14
DOIs
Publication statusPublished - 2008 Apr 10
Externally publishedYes

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Surface-Active Agents
Surface active agents
Silicon Dioxide
surfactants
porosity
Silica
Geometry
geometry
silicon dioxide
Ethylene Oxide
Polysorbates
Nonionic surfactants
Pore structure
Hydrocarbons
Phase composition
Boiling liquids
ethylene oxide
Ethylene
Dissolution
linkages

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Controlled design of ordered and disordered pore architectures, geometries, and dimensions of HOM-type mesostructured monoliths and their hydrothermal stabilities. / El-Safty, Sherif A.; Kiyozumi, Yoshimichi; Hanaoka, Takaaki; Mizukami, Fujio.

In: Journal of Physical Chemistry C, Vol. 112, No. 14, 10.04.2008, p. 5476-5489.

Research output: Contribution to journalArticle

El-Safty, Sherif A. ; Kiyozumi, Yoshimichi ; Hanaoka, Takaaki ; Mizukami, Fujio. / Controlled design of ordered and disordered pore architectures, geometries, and dimensions of HOM-type mesostructured monoliths and their hydrothermal stabilities. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 14. pp. 5476-5489.
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