Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Studies in Surface Science and Catalysis, 2000, Vol.129, p.7-14

Ort / Verlag

Elsevier Science & Technology

Erscheinungsjahr

2000

Beschreibungen/Notizen

• The addition of water-soluble polymers such as polyethylene oxide (PEO) or polyvinyl alcohol (PVA) into the synthetic mixture of the CnTMAX-HNO3-TEOS-H2O 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.