C60-Propylamine Adduct Monolayers at the Gas/Water Interface: A Brewster Angle Microscopy and X-Ray Scattering Study
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| dc.contributor.author |
Fukumo, Masafumi |
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| dc.contributor.author |
Penanen, Konstantin |
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| dc.contributor.author |
Heilmann, Ralf K. |
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| dc.contributor.author |
Pershan, Peter S.
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| dc.contributor.author |
Vaknin, David |
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| dc.date.accessioned |
2010-09-08T13:48:41Z |
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| dc.date.issued |
1997 |
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| dc.identifier.citation |
Fukumo, Masafumi, Konstantin Penanen, Ralf K. Heilmann, Peter S. Pershan, and David Vaknin. 1997. C60-propylamine adduct monolayers at the gas/water interface: A Brewster angle microscopy and x-ray scattering study. Journal of Chemical Physics 107(14): 5531-5546. |
en_US |
| dc.identifier.issn |
0021-9606 |
en_US |
| dc.identifier.uri |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:4428803 |
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| dc.description.abstract |
Brewster angle microscopy (BAM), x-ray specular reflectivity and grazing-incidence x-ray diffraction (GID) studies of C60-propylamine adduct monolayers at the gas/water interface as a function of molecular area are reported. At large molecular areas (A> ∼ 150 Å2/molecule), BAM images reveal macroscopic heterogeneity in the film, consisting of the coexistence between regions covered with uniform solidlike monolayer and bare water surface. After compression to a limiting molecular area of 150 Å2/molecule, the film is observed to be homogeneous, with the uniform monolayer covering the entire available surface. Both the x-ray reflectivity results and the GID patterns are consistent with the formation of a uniform monolayer at A ∼ 150 Å2/molecule, while the little dependence that the GID patterns have on the molecular area for A> ∼ 150 Å2/molecule is consistent with the heterogeneity in the film. Upon further compression to higher densities (A< ∼ 120 Å2/molecule), the x-ray reflectivity results suggest the formation of a partial layer either at the molecule/gas interface or at the molecule/water interface. In this high density regime, the shift in the observed GID pattern with molecular area is much smaller than would be expected if the film were to remain a homogeneous monolayer, also consistent with the formation of an inhomogeneous partial layer. The analysis of the broad GID pattern observed from a uniform monolayer in terms of a model 2D radial distribution function, implies a short range positional correlation, extending to only a few molecular distances. The average nearest neighbor distance (d ∼ 13 Å), extracted from the GID analysis, is consistent with the limiting molecular area (A ∼ 150 Å2/molecule) assuming local hexagonal packing. These results together with the sharp facets observed in the BAM images demonstrate that the monolayer when uniform is a two-dimensional amorphous solid. |
en_US |
| dc.description.sponsorship |
Engineering and Applied Sciences |
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| dc.language.iso |
en_US |
en_US |
| dc.publisher |
American Institute of Physics |
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| dc.relation.isversionof |
doi:10.1063/1.474229 |
en_US |
| dc.relation.hasversion |
http://liquids.seas.harvard.edu/peter/1997.pdf/97_2_C60.pdf |
en_US |
| dash.license |
LAA |
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| dc.title |
C60-Propylamine Adduct Monolayers at the Gas/Water Interface: A Brewster Angle Microscopy and X-Ray Scattering Study |
en_US |
| dc.type |
Journal Article |
en_US |
| dc.description.version |
Version of Record |
en_US |
| dc.relation.journal |
Journal of Chemical Physics |
en_US |
| dash.depositing.author |
Pershan, Peter S.
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| dc.date.available |
2010-09-08T13:48:41Z |
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