Synthesis of uniform and stable millimeter-sized mesoporous silica ropes by the addition of polymer and ammonia hydrothermal treatment

Hong-Ping Lin, Lu Yi Yang, Chung Yuan Mou, Huang Kuei Lee, Shang Bin Liu

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The addition of water-soluble polymers such as polyethylene oxide (PEO) or polyvinyl alcohol (PVA) into the synthetic mixture of the C n TMAX-HNO 3 -TEOS-H 2 O system (n = 16 or 18; X = Br or Cl) under shear flow is found to promote uniformity and elongation of rope-like mesoporous silica. The millimeter-scaled mesoporous silica ropes are found to possess a three-level hierarchical structure. The addition of water-soluble polymer does not affect the physical properties of the silica ropes. Moreover, further hydrothermal treatment of the acid-made material under basic ammonia conditions effectively promotes reconstruction of the silica nanochannels while maintaining the rope-like morphology. As a result, a notable enhancement in both thermal and hydrothermal stability is found.

Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume129
Publication statusPublished - 2000 Jan 1

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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