https://scholars.lib.ntu.edu.tw/handle/123456789/321919
Title: | 'Tubules-within-a-tubule' hierarchical order of mesoporous molecular sieves in MCM-41 | Authors: | Lin, H.-P. CHUNG-YUAN MOU |
Issue Date: | 1996 | Journal Volume: | 273 | Journal Issue: | 5276 | Start page/Pages: | 765-768 | Source: | Science | Abstract: | The recently discovered mesoporous aluminosilicate MCM-41 consists of hexagonal arrays of nanometer-sized cylindrical pores. It is shown that this material can be synthesized by cooperative condensation of silicate and cylindrical cationic micelles. Careful control of the surfactant-water content and the rate of condensation of silica at high alkalinity resulted in hollow tubules 0.3 to 3 micrometers in diameter. The wall of the tubules consisted of coaxial cylindrical pores, nanometers in size, that are characteristic of those of MCM-41. The formation of this higher order structure may take place through a liquid crystal phase transformation mechanism involving an anisotropic membrane-to-tubule phase change. The hierarchical organization of this 'tubules-within-a-tubule' particle texture is similar to that of the frustules of marine diatoms. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-0029783547&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/321919 |
DOI: | 10.1126/science.273.5276.765 | SDG/Keyword: | aluminum; silicon dioxide; surfactant; anisotropy; article; chemical structure; crystal structure; phase transition; polymerization; priority journal; scanning electron microscopy; transmission electron microscopy; water content; X ray diffraction; Bacillariophyta; Nitzschia alba |
Appears in Collections: | 化學系 |
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