Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Diffraction Studies of Langmuir Films
Abstract Insoluble organic molecules that are amphiphilic, i.e. with both hydrophobic and hydrophilic sections, can usually be spread on the surface of water to form monomolecular films. Although these films have been known for thousands of years, Irving Langmuir’s name is now attached to them in recognition of a vital contribution [1]: he found in 1917 that the two-dimensional pressure (π) vs. specific area (A) curves for these films had apparent discontinuities suggesting the existence of multiple monolayer phases. Such studies are now easily performed using commercial apparatus, and π-A data for thousands of materials exist in the literature, along with structural speculations based on this indirect and ambiguous evidence. Unfortunately, the films have proved relatively inaccessible to many of the usual condensed-matter probes; in particular, until very recently [2, 3] there had been no direct structural information (i.e. no diffraction data). In this report, we summarize the results to date of our diffraction studies of mono layers of three ‘simple’ compounds: lead octadecanoate (stearate), tetracosanoic acid, and 1-eicosanol.
Diffraction Studies of Langmuir Films
Abstract Insoluble organic molecules that are amphiphilic, i.e. with both hydrophobic and hydrophilic sections, can usually be spread on the surface of water to form monomolecular films. Although these films have been known for thousands of years, Irving Langmuir’s name is now attached to them in recognition of a vital contribution [1]: he found in 1917 that the two-dimensional pressure (π) vs. specific area (A) curves for these films had apparent discontinuities suggesting the existence of multiple monolayer phases. Such studies are now easily performed using commercial apparatus, and π-A data for thousands of materials exist in the literature, along with structural speculations based on this indirect and ambiguous evidence. Unfortunately, the films have proved relatively inaccessible to many of the usual condensed-matter probes; in particular, until very recently [2, 3] there had been no direct structural information (i.e. no diffraction data). In this report, we summarize the results to date of our diffraction studies of mono layers of three ‘simple’ compounds: lead octadecanoate (stearate), tetracosanoic acid, and 1-eicosanol.
Diffraction Studies of Langmuir Films
Peng, J. B. (Autor:in) / Lin, B. (Autor:in) / Ketterson, J. B. (Autor:in) / Dutta, P. (Autor:in)
01.01.1988
5 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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