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  Anhydrous octyl-glucoside phase transition from lamellar to isotropic induced by electric and magnetic fields

Hashim, R., Sugimura, A., Nguan, H.-S., Rahman, M., & Zimmermann, H. (2017). Anhydrous octyl-glucoside phase transition from lamellar to isotropic induced by electric and magnetic fields. The Journal of Chemical Physics, 146(8): 084702, pp. 1-8. doi:10.1063/1.4976979.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-C57D-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-CB4B-C
Genre: Journal Article

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Hashim, Rauzah, Author
Sugimura, Akihiko, Author
Nguan, Hock-Seng, Author
Rahman, Matiur, Author
Zimmermann, Herbert1, 2, Author              
Affiliations:
1Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society, Jahnstrasse 29, 69120 Heidelberg, DE, ou_1497712              
2Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Abstract: A static deuterium nuclear magnetic resonance (2HNMR) technique (magnetic field, B = 7.05 T) was employed to monitor the thermotropic lamellar phase of the anhydrous 1:1 mixture sample of octyl-b-D-glucoside (βOG) and that of partially deuterium labelled at the alpha position on the chain, i.e.,βOG-d2 In the absence of an electric field, the 2H NMR spectrum of the mixture gives a typical quadrupolar doublet representing the aligned lamellar phase. Upon heating to beyond the clearing temperature at 112 °C, this splitting converts to a single line expected for an isotropic phase. Simultaneous application of magnetic and electric fields (E = 0.4 MV/m) at 85 °C in the lamellar phase, whose direction was set to be parallel or perpendicular to the magnetic field, resulted in the change of the doublet into a single line and this recovers to the initial doublet with time for both experimental geometries. This implies E- and B-field-induced phase transitions from the lamellar to an isotropic phase and a recovery to the lamellar phase again with time. Moreover, these phase transformations are accompanied by a transient current. A similar observation was made in a computational study when an electric field was applied to a water cluster system. Increasing the field strength distorts the water cluster and weakens its hydrogen bonds leading to a structural breakdown beyond a threshold field-strength. Therefore, we suggest the observed field-induced transition is likely due to a structure change of the βOG lamellar assembly caused by the field effect and not due to Joule heating.

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Language(s): eng - English
 Dates: 2016-10-112017-02-072017-02-27
 Publication Status: Published online
 Pages: 8
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 Rev. Method: Peer
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Title: The Journal of Chemical Physics
  Other : J. Chem. Phys.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: - Volume / Issue: 146 (8) Sequence Number: 084702 Start / End Page: 1 - 8 Identifier: ISSN: 0021-9606
CoNE: /journals/resource/954922836226