Review on the key controls of designer copolymer-silica mesophase monoliths (HOM-type) with large particle morphology, ordered geometry and uniform pore dimension

Sherif A. El-Safty

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

This review introduces the extensive key factors of the design of mesostructured monoliths with two- and three-dimensional (2D and 3D) geometries and large particle morphologies. Simple strategy in terms of fabrication time (within 10 min) and composition phase domains was achieved by using an instant direct-templating method of lyotropic and microemulsion phases of a variety of triblock copolymer (EOm-POn-EOm) surfactants, as we recently reported in [33] and [34]. The synthetic strategy provides realistic control over a wide range of mesophase geometries, yet maintains the long-range structural ordering, and thus improved the simplicity, significant periodicity, and high uniformity of the resultant silica monoliths. Cubic mesophases, in particular, exhibit a wide variety of mesostructured geometries when the block copolymers were used as a structure-directing agent under acidic synthesis conditions. For example, triblock copolymer (P123, EO 20PO70EO20) was used to fabricate 2D hexagonal (P6mm). Our synthesis protocol revealed that ordered 3D cubic (Fd3m), (Im3m), and (Ia3d) silica monoliths were also fabricated in large domain sizes by templating P123 copolymers. In general, key factors such as the degree of solubilization of the hydrocarbons (co-solvent), the copolymer concentrations used in the phase domains, and the copolymer molecular nature, such as EO/PO ratio, significantly affect the formation of mesostructured phases and their extended long-range ordering in the final replicas of the silica monolith frameworks. The remarkable structural findings of 2D and 3D frameworks, transparent monoliths, and micropores combined with large cage- and cylindrical-like mesopores might show their desirability in many applications.

Original languageEnglish
Pages (from-to)369-387
Number of pages19
JournalJournal of Porous Materials
Volume15
Issue number4
DOIs
Publication statusPublished - 2008 Aug
Externally publishedYes

Fingerprint

Silicon Dioxide
Block copolymers
copolymers
UCON 50-HB-5100
Copolymers
Silica
silicon dioxide
porosity
Geometry
geometry
Microemulsions
Hydrocarbons
Phase composition
Surface-Active Agents
Surface active agents
Fabrication
synthesis
block copolymers
replicas
periodic variations

Keywords

  • Copolymer phases
  • Cubic geometries
  • Cylindrical and cage pores
  • Monoliths
  • Synthesis design

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Catalysis

Cite this

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