Mesoporous silica SBA-15 sheet with perpendicular nanochannels

Yi Qi Yeh, Hong Ping Lin, Chih Yuan Tang, Chung Yuan Mou

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Free-standing thin sheet form of mesoporous silica materials with perpendicular orientation is a much desired materials for its possible applications in catalysis, mask, and separation. A three component amphiphile system of sodium dodecyl sulfate/hexadecyltrimethylammonium bromide/pluronic-123(C16TMAB/SDS/P123) was employed to template the condensation of sodium silicates for the formation of SBA(⊥), a thin sheet of SBA-15 with perpendicular nanochannels. SBA(⊥) can be synthesized at SDS/C16TMAB=1.5 and T≥40°C and shows pH-dependent morphology. It has uniform pore size ~9nm, homogeneous sheet thickness in the range of 60-300nm and dimension of several microns. We studied in details the structure and morphology of the SBA(⊥) with variation of three experimental parameters: the SDS/C16TMAB ratio, the temperature, and the pH condition in the synthetic gel. It is proposed that the mixed surfactants of SDS and C16TMAB form catanionic vesicle in which the P123 and silicates are condensed. The balanced interaction of P123/silicate with the narrow confinement under surfactant bi-layers of C16TMAB/SDS promoted the formation of perpendicular nanochannels. Low temperature and pH conditions favor stronger segregation of the PPO and PEO-oligosilicate segments in the SBA(⊥) structure which gives the basis of thickness control of the sheet. The control of structure and morphology are discussed with modern theory of microphase separation in block copolymers under confinement.

Original languageEnglish
Pages (from-to)354-366
Number of pages13
JournalJournal of Colloid And Interface Science
Volume362
Issue number2
DOIs
Publication statusPublished - 2011 Oct 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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