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In situ observation of the aggregated morphology and interaction of dialkyldimethylammonium bromide with DNA at air/water interface by Brewster angle microscopy

Sun, Lu, Xu, Miao, Hou, Xueliang and Wu, Lixin 2004, In situ observation of the aggregated morphology and interaction of dialkyldimethylammonium bromide with DNA at air/water interface by Brewster angle microscopy, Materials letters, vol. 58, no. 9, pp. 1466-1470, doi: 10.1016/j.matlet.2003.10.010.

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Title In situ observation of the aggregated morphology and interaction of dialkyldimethylammonium bromide with DNA at air/water interface by Brewster angle microscopy
Author(s) Sun, LuORCID iD for Sun, Lu orcid.org/0000-0003-2999-1250
Xu, Miao
Hou, Xueliang
Wu, Lixin
Journal name Materials letters
Volume number 58
Issue number 9
Start page 1466
End page 1470
Publisher Elsevier BV
Place of publication Amsterdam, Netherlands
Publication date 2004-03
ISSN 0167-577X
1873-4979
Summary The adsorption of DNA on the Langmuir film of a cationic surfactant, dioctadecyldimethylammonium bromide (DODA·Br), and the change of the aggregation morphology of the composite monolayer with respect to surface pressure have been investigated by Brewster angle microscopy (BAM). In contrast with the case of DODA·Br on pure water subphase, when DNA was dispersed into subphase, its adsorption to the interface monolayer through electrostatic interaction decreases the charge density and therefore promotes the formation of domain at low surface pressure. In addition, the electrostatic interaction changed the phase morphology of DODA·Br Langmuir monolayer under different surface pressure, that is, from flower-shaped crystalline domain on the pure water subphase to circular domain on the subphase dispersed with DNA. The result also shows that the monolayer of the composite at air/water interface under the high pressure is not homogeneous, but consists of incompletely fused domains. For the Langmuir film of the surfactant with shorter alkyl-chains, similar morphology can be observed both under the high and low surface pressure. But the tight-stacked circular domain is no longer observed.
Language eng
DOI 10.1016/j.matlet.2003.10.010
Field of Research 091202 Composite and Hybrid Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003 Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30026274

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