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Abstract
Although the search for new zeolites has traditionally been based on trial and error, more rational methods are now available. The theoretical concept of inverse sigma transformation of a zeolite framework to generate a new structure by removal of a layer of framework atoms and contraction has for the first time been achieved experimentally. The reactivity of framework germanium atoms in strong mineral acid was exploited to selectively remove germanium-containing four-ring units from an UTL type germanosilicate zeolite. Annealing of the leached framework through calcination led to the new all-silica COK-14 zeolite with intersecting 12-and 10-membered ring channel systems. An intermediate stage of this inverse sigma transformation with dislodged germanate four-rings still residing in the pores could be demonstrated. Inverse sigma transformation involving elimination of germanium-containing structural units opens perspectives for the synthesis of many more zeolites.
Keywords
ALUMINOSILICATE, CRYSTALLIZATION, CATALYSTS, FRAMEWORK, MOLECULAR-SIEVE, SIMULATION, NANOSHEETS, TOPOLOGY, CHANNELS, SYSTEM

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MLA
Verheyen, Elke, Lennart Joos, Kristof Van Havenbergh, et al. “Design of Zeolite by Inverse Sigma Transformation.” NATURE MATERIALS 11.12 (2012): 1059–1064. Print.
APA
Verheyen, Elke, Joos, L., Van Havenbergh, K., Breynaert, E., Kasian, N., Gobechiya, E., Houthoofd, K., et al. (2012). Design of zeolite by inverse sigma transformation. NATURE MATERIALS, 11(12), 1059–1064.
Chicago author-date
Verheyen, Elke, Lennart Joos, Kristof Van Havenbergh, Eric Breynaert, Natalia Kasian, Elena Gobechiya, Kristof Houthoofd, et al. 2012. “Design of Zeolite by Inverse Sigma Transformation.” Nature Materials 11 (12): 1059–1064.
Chicago author-date (all authors)
Verheyen, Elke, Lennart Joos, Kristof Van Havenbergh, Eric Breynaert, Natalia Kasian, Elena Gobechiya, Kristof Houthoofd, Charlotte Martineau, Manjel Hinterstein, Francis Taulelle, Veronique Van Speybroeck, Michel Waroquier, Sara Bals, Gustaaf Van Tendeloo, Christine EA Kirschhock, and Johan A Martens. 2012. “Design of Zeolite by Inverse Sigma Transformation.” Nature Materials 11 (12): 1059–1064.
Vancouver
1.
Verheyen E, Joos L, Van Havenbergh K, Breynaert E, Kasian N, Gobechiya E, et al. Design of zeolite by inverse sigma transformation. NATURE MATERIALS. 2012;11(12):1059–64.
IEEE
[1]
E. Verheyen et al., “Design of zeolite by inverse sigma transformation,” NATURE MATERIALS, vol. 11, no. 12, pp. 1059–1064, 2012.
@article{3076434,
  abstract     = {Although the search for new zeolites has traditionally been based on trial and error, more rational methods are now available. The theoretical concept of inverse sigma transformation of a zeolite framework to generate a new structure by removal of a layer of framework atoms and contraction has for the first time been achieved experimentally. The reactivity of framework germanium atoms in strong mineral acid was exploited to selectively remove germanium-containing four-ring units from an UTL type germanosilicate zeolite. Annealing of the leached framework through calcination led to the new all-silica COK-14 zeolite with intersecting 12-and 10-membered ring channel systems. An intermediate stage of this inverse sigma transformation with dislodged germanate four-rings still residing in the pores could be demonstrated. Inverse sigma transformation involving elimination of germanium-containing structural units opens perspectives for the synthesis of many more zeolites.},
  author       = {Verheyen, Elke and Joos, Lennart and Van Havenbergh, Kristof and Breynaert, Eric and Kasian, Natalia and Gobechiya, Elena and Houthoofd, Kristof and Martineau, Charlotte and Hinterstein, Manjel and Taulelle, Francis and Van Speybroeck, Veronique and Waroquier, Michel and Bals, Sara and Van Tendeloo, Gustaaf and Kirschhock, Christine EA and Martens, Johan A},
  issn         = {1476-1122},
  journal      = {NATURE MATERIALS},
  keywords     = {ALUMINOSILICATE,CRYSTALLIZATION,CATALYSTS,FRAMEWORK,MOLECULAR-SIEVE,SIMULATION,NANOSHEETS,TOPOLOGY,CHANNELS,SYSTEM},
  language     = {eng},
  number       = {12},
  pages        = {1059--1064},
  title        = {Design of zeolite by inverse sigma transformation},
  url          = {http://dx.doi.org/10.1038/NMAT3455},
  volume       = {11},
  year         = {2012},
}

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