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Article: Kinetics of a structural phase transition in Langmuir monolayers studied using x-ray diffraction

TitleKinetics of a structural phase transition in Langmuir monolayers studied using x-ray diffraction
Authors
Issue Date1989
PublisherAmerican Institute of Physics. The Journal's web site is located at http://jcp.aip.org/jcp/staff.jsp
Citation
The Journal of Chemical Physics, 1989, v. 90 n. 4, p. 2393-2397 How to Cite?
AbstractFrequently, time-dependent effects are seen in monolayers of amphiphilic molecules (Langmuir films) when they are compressed, so that the pressure after some time is different from that recorded immediately after compression. We have identified for the first time a microscopic relaxation mechanism in monolayers of heneicosanol (C21,H43OH): namely, a transition from a uniaxially distorted ("pseudohexagonal") structure, formed upon compression, to an undistorted hexagonal structure. For T > 20°C we observe only an apparently hexagonal phase, while at T = 5°C we observe only an apparently stable pseudohexagonal phase. When 10≤T≤20°C, the monolayer structure changes with time from pseudohexagonal to hexagonal. The rate at which this transformation occurs is strongly temperature dependent. We propose that the observed temperature dependence is determined by the rate of nucleation of a hexagonal phase from a metastable shear-induced structure. © 1989 American Institute of Physics.
Persistent Identifierhttp://hdl.handle.net/10722/91089
ISSN
2015 Impact Factor: 2.894
2015 SCImago Journal Rankings: 0.959

 

DC FieldValueLanguage
dc.contributor.authorLin, Ben_HK
dc.contributor.authorPeng, JBen_HK
dc.contributor.authorKetterson, JBen_HK
dc.contributor.authorDutta, Pen_HK
dc.contributor.authorThomas, BNen_HK
dc.contributor.authorBuontempo, Jen_HK
dc.contributor.authorRice, SAen_HK
dc.date.accessioned2010-09-17T10:12:52Z-
dc.date.available2010-09-17T10:12:52Z-
dc.date.issued1989en_HK
dc.identifier.citationThe Journal of Chemical Physics, 1989, v. 90 n. 4, p. 2393-2397en_HK
dc.identifier.issn0021-9606en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91089-
dc.description.abstractFrequently, time-dependent effects are seen in monolayers of amphiphilic molecules (Langmuir films) when they are compressed, so that the pressure after some time is different from that recorded immediately after compression. We have identified for the first time a microscopic relaxation mechanism in monolayers of heneicosanol (C21,H43OH): namely, a transition from a uniaxially distorted ("pseudohexagonal") structure, formed upon compression, to an undistorted hexagonal structure. For T > 20°C we observe only an apparently hexagonal phase, while at T = 5°C we observe only an apparently stable pseudohexagonal phase. When 10≤T≤20°C, the monolayer structure changes with time from pseudohexagonal to hexagonal. The rate at which this transformation occurs is strongly temperature dependent. We propose that the observed temperature dependence is determined by the rate of nucleation of a hexagonal phase from a metastable shear-induced structure. © 1989 American Institute of Physics.en_HK
dc.languageengen_HK
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://jcp.aip.org/jcp/staff.jspen_HK
dc.relation.ispartofThe Journal of Chemical Physicsen_HK
dc.titleKinetics of a structural phase transition in Langmuir monolayers studied using x-ray diffractionen_HK
dc.typeArticleen_HK
dc.identifier.emailLin, B:blin@hku.hken_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0009261155en_HK
dc.identifier.volume90en_HK
dc.identifier.issue4en_HK
dc.identifier.spage2393en_HK
dc.identifier.epage2397en_HK

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