Hierarchically structured silica via combination of salt sintering process and phase separation

• Autorzy: Reinhardt B. , Enke D. , Bienhaus G.
• Języki publikacji: PL

Abstrakty

EN

Hierarchically structured, porous glass monoliths have been prepared successfully via combination of a salt sintering process and phase separation of a sodium borosilicate glass. The materials were characterized by N2-adsorption, Hg-intrusion and scanning electron microscopy. Secondary pore sizes were adjusted by the use of different grain fractions of the filler, different primary pore sizes could be obtained by a variation of the annealing conditions. Thus, both pore systems could be adjusted independently. The resulting monoliths consist of a system of secondary pores between 20 and 150 ?m and primary pores within the walls of the open-pored sintered material between 1 and 70 nm. The hierarchical porous materials exhibit surface areas up to 420 m2g-1 and total porosities up to 74%. Various shapes, e.g., rods, plates and granules were obtained by using appropriate pressing tools.

Słowa kluczowe

EN

sintering; phase separation; borosilicate glass

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2012
• Tom: Vol. 42, nr 2
• Strony: 265--270
• Opis fizyczny: Bibliogr. 10 poz.

Twórcy

autor

Reinhardt B.

autor

Enke D.

autor

Bienhaus G.

• Institute of Chemical Technology, University of Leipzig, Linnéstraße 3, 04103 Leipzig, Germany

Bibliografia

• [1] NAKANISHI K., TAKAHASHI R., NAGAKANE T., KITAYAMA K., KOHEIYA N., SHIKATA H., SOGA N., Formation of hierarchical pore structure in silica gel, Journal of Sol-Gel Science and Technology 17(3), 2000, pp. 191–210.
• [2] RAUSCHER M., SELVAM T., SCHWIEGER W., FREUDE D., Hydrothermal transformation of porous glass granules into ZSM-5 granules, Microporous and Mesoporous Materials 75(3), 2004, pp. 195–202.
• [3] HARTMANN M., Hierarchical zeolites: A proven strategy to combine shape selectivity with efficient mass transport, Angewandte Chemie International Edition 43(44), 2004, pp. 5880–5882.
• [4] SIEBERS F.B., GREULICH N., KIEFER W., Manufacture, properties and application of open-pore sintered glasses and open-pore sintered glass-ceramics, Glastechnischer Bericht 62, 1989, pp. 63–73.
• [5] JANOWSKI F., HEYER W., Poröse Gläser – Herstellung, Eigenschaften und Anwendung, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig, 1982.
• [6] NORDBERG M.E., Properties of some Vycor-brand glasses, Journal of the American Ceramic Society 27(10), 1944, pp. 299–305
• [7] KIEFER W., Method of manufacturing porous sintered inorganic bodies with large open pore volume, United States Patent US458854, 1984.
• [8] HORVATH G., KAWAZOE K., Method for the calculation of effective pore size distribution in molecular sieve carbon, Journal of Chemical Engineering of Japan 16(6), 1983, pp. 470–475.
• [9] DUBININ M., A study of the porous structure of active carbons using a variety of methods, Quarterly Reviews, Chemical Society 9(2), 1955, pp. 101–114.
• [10] BRUNAUER S., EMMETT P.H., TELLER E., Adsorption of gases in multimolecular layers, Journal of the American Chemical Society 60(2), 1938, pp. 309–319.