TY - JOUR
T1 - A layer stacking with large repeating unit in multi-modal cage-type anionic-surfactant-templated silica mesoporous crystal
AU - Sakamoto, Yasuhiro
AU - Terasaki, Osamu
N1 - Funding Information:
We are grateful to Prof. Shunai Che and Dr. Chuanbo Gao (Shanghai Jiao Tong University, Shanghai) for providing samples and for their helpful discussions. This work was supported by a Grant-in-Aid for Young Scientists (Start-up) from JSPS, Japan (No. 21810024 ). Y.S. and O.T. thank the Swedish Research Council (VR) and the Japan Science and Technology Agency (JST) for their financial support. TEM studies were performed at the Electron Microscopy Center (EMC) at Stockholm University, which is supported by the Knut and Alice Wallenberg Foundation.
PY - 2011/4
Y1 - 2011/4
N2 - Cage-type anionic-surfactant-templated silica mesoporous crystals display rich structural diversity. Among them, cage-type mesoporous crystals with tetrahedrally close-packed (tcp) structures can be described by four types of polyhedron, 512, 51262, 5126 3 and 51264. We have found new stacking sequences as a minor phase coexisting with an Fd3m structure, and have characterized their structures using transmission electron microscopy (TEM). The new stacking sequences can be explained by the stacking of three kinds of layer based on a description of the polyhedra. Two of the layers consist of two kinds of polyhedron, 512 and 51264, and these two layers are also the constituents of the Fd3m structure. The other layer consists of two different kinds of polyhedron, 51262 and 5 1263, corresponding to layer z, which were introduced in our recently published papers [e.g. Y. Sakamoto, et al., Chem. Mater. 21 (2009) 223]. We have observed that one of the new stacking sequences, with a large repeating unit, contains these three layers and bears a close resemblance to one of the Frank-Kasper phases with rhombohedral symmetry, known as μ-phase.
AB - Cage-type anionic-surfactant-templated silica mesoporous crystals display rich structural diversity. Among them, cage-type mesoporous crystals with tetrahedrally close-packed (tcp) structures can be described by four types of polyhedron, 512, 51262, 5126 3 and 51264. We have found new stacking sequences as a minor phase coexisting with an Fd3m structure, and have characterized their structures using transmission electron microscopy (TEM). The new stacking sequences can be explained by the stacking of three kinds of layer based on a description of the polyhedra. Two of the layers consist of two kinds of polyhedron, 512 and 51264, and these two layers are also the constituents of the Fd3m structure. The other layer consists of two different kinds of polyhedron, 51262 and 5 1263, corresponding to layer z, which were introduced in our recently published papers [e.g. Y. Sakamoto, et al., Chem. Mater. 21 (2009) 223]. We have observed that one of the new stacking sequences, with a large repeating unit, contains these three layers and bears a close resemblance to one of the Frank-Kasper phases with rhombohedral symmetry, known as μ-phase.
KW - Electron microscopy
KW - Multi-modal cage-type structure
KW - Polyhedron
KW - Silica mesoporous crystal
KW - Tetrahedrally close-packed structure
UR - http://www.scopus.com/inward/record.url?scp=79953050972&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79953050972&partnerID=8YFLogxK
U2 - 10.1016/j.solidstatesciences.2010.04.006
DO - 10.1016/j.solidstatesciences.2010.04.006
M3 - Article
AN - SCOPUS:79953050972
SN - 1293-2558
VL - 13
SP - 762
EP - 767
JO - Solid State Sciences
JF - Solid State Sciences
IS - 4
ER -