File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: X-ray diffraction study of a Langmuir monolayer of C21H 43OH

TitleX-ray diffraction study of a Langmuir monolayer of C21H 43OH
Authors
Issue Date1988
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, 1988, v. 89 n. 4, p. 2257-2270 How to Cite?
AbstractWe have studied the structure of a monolayer of C21H 43OH on water, in the region near close packing, by grazing incidence in-plane x-ray diffraction. For all temperatures studied the isotherms in the πa plane show a kink, signaling a phase transition. Along an isotherm, and for pressures above the kink, we observe that the transverse structure factor has one peak which has constant position, width, and intensity; below the kink the diffraction peak shifts to smaller scattering vector (larger separation) and the amplitude decays as the surface pressure decreases, but the width of the peak remains constant. We rationalize these observations in terms of the influence on the transverse structure factor of gauche configurations in the amphiphile tails, with the kink representing the point at which the last of the gauche configurations is squeezed out of the chain. Along an isobar which is at higher pressure than the kink pressures of all isotherms crossed, the transverse structure factor has a single peak above a transition temperature and two peaks below that temperature; for π = 30 dyn/cm the transition temperature is in the range 16.3 < T < 21.3°C. We interpret this observation, by comparison with the properties of the lamellar crystalline n-paraffins, as a hexagonal-to-pseudohexagonal structural transition analogous to the crystal rotator II-to-rotator I transition. Our results imply that the hydrocarbon tails of the amphiphile molecules dominate the properties of the monolayer. © 1988 American Institute of Physics.
Persistent Identifierhttp://hdl.handle.net/10722/90783
ISSN
2015 Impact Factor: 2.894
2015 SCImago Journal Rankings: 0.959

 

DC FieldValueLanguage
dc.contributor.authorBarton, SWen_HK
dc.contributor.authorThomas, BNen_HK
dc.contributor.authorFlom, EBen_HK
dc.contributor.authorRice, SAen_HK
dc.contributor.authorLin, Ben_HK
dc.contributor.authorPeng, JBen_HK
dc.contributor.authorKetterson, JBen_HK
dc.contributor.authorDutta, Pen_HK
dc.date.accessioned2010-09-17T10:08:19Z-
dc.date.available2010-09-17T10:08:19Z-
dc.date.issued1988en_HK
dc.identifier.citationThe Journal of Chemical Physics, 1988, v. 89 n. 4, p. 2257-2270en_HK
dc.identifier.issn0021-9606en_HK
dc.identifier.urihttp://hdl.handle.net/10722/90783-
dc.description.abstractWe have studied the structure of a monolayer of C21H 43OH on water, in the region near close packing, by grazing incidence in-plane x-ray diffraction. For all temperatures studied the isotherms in the πa plane show a kink, signaling a phase transition. Along an isotherm, and for pressures above the kink, we observe that the transverse structure factor has one peak which has constant position, width, and intensity; below the kink the diffraction peak shifts to smaller scattering vector (larger separation) and the amplitude decays as the surface pressure decreases, but the width of the peak remains constant. We rationalize these observations in terms of the influence on the transverse structure factor of gauche configurations in the amphiphile tails, with the kink representing the point at which the last of the gauche configurations is squeezed out of the chain. Along an isobar which is at higher pressure than the kink pressures of all isotherms crossed, the transverse structure factor has a single peak above a transition temperature and two peaks below that temperature; for π = 30 dyn/cm the transition temperature is in the range 16.3 < T < 21.3°C. We interpret this observation, by comparison with the properties of the lamellar crystalline n-paraffins, as a hexagonal-to-pseudohexagonal structural transition analogous to the crystal rotator II-to-rotator I transition. Our results imply that the hydrocarbon tails of the amphiphile molecules dominate the properties of the monolayer. © 1988 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.titleX-ray diffraction study of a Langmuir monolayer of C21H 43OHen_HK
dc.typeArticleen_HK
dc.identifier.emailLin, B:blin@hku.hken_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-36549096036en_HK
dc.identifier.volume89en_HK
dc.identifier.issue4en_HK
dc.identifier.spage2257en_HK
dc.identifier.epage2270en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats