Evolution of Helical Mesostructures

Yuan, Pei, Zhao, Lingzhi, Liu, Nian, Wei, Guangfeng, Wang, Yunhua, Auchterlonie, Graeme J., Drennan, J., Lu, Gao Qing, Zou, Jin and Yu, Chengzhong (2010) Evolution of Helical Mesostructures. Chemistry: A European Journal, 16 5: 1629-1637. doi:10.1002/chem.200902435

Author Yuan, Pei
Zhao, Lingzhi
Liu, Nian
Wei, Guangfeng
Wang, Yunhua
Auchterlonie, Graeme J.
Drennan, J.
Lu, Gao Qing
Zou, Jin
Yu, Chengzhong
Title Evolution of Helical Mesostructures
Journal name Chemistry: A European Journal   Check publisher's open access policy
ISSN 0947-6539
Publication date 2010-02-01
Year available 2009
Sub-type Article (original research)
DOI 10.1002/chem.200902435
Volume 16
Issue 5
Start page 1629
End page 1637
Total pages 9
Editor Neville Compton
Place of publication Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Language eng
Subject C1
091405 Mining Engineering
970109 Expanding Knowledge in Engineering
Abstract An intriguing evolution from a simple internal helix to a hierarchical helical (HH) mesostructure with both internal and external helices or a complicated screwlike and concentric circular (CC) mesostructure is successfully observed. The complicated helical structures are determined by TEM studies and 3D electron tomography. We demonstrate a topological helix-coil transition between the internal and external helices to reveal the origin of the HH mesostructure and the relationship between the straight helical and HH rods. Moreover, the boundary condition of the helix-coil transition is clarified to explain in detail the formation of complex helical structures, such as the screwlike mesostructure. It is proposed that the final structural characteristics are determined exactly by the balance between the decrease in the surface free energy and the maintenance of the hexagonal packing in one individual rod, which explains the formation of unusual CC, HH, and screw-like morphologies in one pot. Our success has opened new opportunities in the characterization of complex porous architectures, thus paving a way to remarkable advances in the fields of synthesis, understanding, and application of novel porous materials.
Keyword Electron tomography
Helical structures
Helix-coil transition
Chiral mesoporous silica
Achiral cationic surfactant
Circular mesostructures
Electron tomography
Coil transition
Q-Index Code C1
Q-Index Status Confirmed Code

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Created: Sun, 21 Mar 2010, 10:09:04 EST