Mesoporous silica from lyotropic liquid crystal polymer templates

Angewandte Chemie - International Edition

Volumn 37, Issue 5, 1998, Pages 613-616

  Göltner, Christine G ^a   Henke, Susanne ^a   Weissenberger, Markus C ^a   Antonietti, Markus ^a  

^a MAX PLANCK INSTITUTE OF COLLOIDS AND INTERFACES   (Germany)

Author keywords

Amphiphiles; Block copolymers; Mesoporosity; Silicates; Sol gel processes

Indexed keywords

EID: 0038807468     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-3773(19980316)37:5<613::AID-ANIE613>3.0.CO;2-G     Document Type: Article

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20. The polymers were supplied by the company Th. Goldschmidt AG.
21. The amphiphilic block copolymer (2 g) is dissolved in tetramethylorthosilicale (TMOS, 4 g), which is then hydrolyzed by adding dilute hydrochloric acid (pH 2, 2 g). Initially, an isotropic mixture is obtained. Methanol is removed by evaporation in vacuo (25 Torr, 30°C). upon which the reaction mixture turns viscous and birefringent. The subsequent sol-gel process is carried out at room temperature (50°C for SE 30/30) in an open flask. After 12 h the liquid crystalline mixtures are solid and, after extraction of a major portion of the template with acetone for 24 h, are calcined at 550°C (12 h under nitrogen, 12 h under oxygen).
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26. The X-ray data were recorded on the EMBL beam line in Hamburg.
27. The X-ray data were fitted with Lorentzian functions. The normalized peak positions for the first three peaks are 1.00, 1.73, and 2.00, which indicates a hexagonal symmetry of the packing.