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  • 1
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    Liquid to hexatic to crystalline order in Langmuir-Blodgett films (1995)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1995-07-07
    Description: Atomic force microscope images of zinc arachidate (ZnA2) Langmuir-Blodgett films show that three- and five-layer films are "hexatic," with long-range bond-orientational order and short-range positional correlations of three to five lattice repeats. The monolayer in contact with the substrate is disordered. Films of seven or more layers of ZnA2 are crystalline. A population of dislocations, most likely originating at the substrate, disrupts the positional but not the orientational order of the lattice, leading to hexatic layers intermediate between crystal and liquid. The influence of the substrate propagates farther into ZnA2 films than into cadmium arachidate films because the molecular cohesion is much weaker in ZnA2 than in cadmium arachidate, as evidenced by a less dense molecular packing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Viswanathan, R -- Madsen, L L -- Zasadzinski, J A -- Schwartz, D K -- GM47334/GM/NIGMS NIH HHS/ -- HL51177/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1995 Jul 7;269(5220):51-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical Engineering, University of California, Santa Barbara 93106, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7604278" target="_blank"〉PubMed〈/a〉
    Keywords: Chemistry, Physical ; Crystallization ; *Eicosanoic Acids ; Fatty Acids, Unsaturated/*chemistry ; Fourier Analysis ; *Membranes, Artificial ; Microscopy, Atomic Force ; Physicochemical Phenomena
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Strained-layer van der Waals epitaxy in a Langmuir-Blodgett film (1993)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1993-07-23
    Description: Atomic force microscope images of Langmuir-Blodgett films of lead and manganese fatty acid salts show that these monolayers have long-range order and are oriented with respect to the mica substrate, although the lattice symmetries of the monolayers and substrate are dramatically different. The surface lattice of sequentially thicker films evolves toward the bulk structure while retaining the substrate alignment. This behavior is in distinct contrast to films of cadmium fatty acid salts on mica, or all films on amorphous silicon oxide, in which the monolayer structure is disordered and a three-layer-thick film displays the bulk structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Viswanathan, R -- Zasadzinski, J A -- Schwartz, D K -- GM 47334/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1993 Jul 23;261(5120):449-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical and Nuclear Engineering, University of California, Santa Barbara 93106.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8392751" target="_blank"〉PubMed〈/a〉
    Keywords: Adsorption ; Aluminum Silicates ; Barium/chemistry ; Cadmium/chemistry ; Chemistry, Physical ; Crystallization ; Eicosanoic Acids/chemistry ; Fatty Acids/*chemistry ; Lead/chemistry ; Manganese/chemistry ; *Membranes, Artificial ; Physicochemical Phenomena ; Silicon Dioxide ; Stearic Acids/chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Langmuir-Blodgett films (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-03-25
    Description: The controlled transfer of organized monolayers of amphiphilic molecules from the airwater interface to a solid substrate was the first molecular-scale technology for the creation of new materials. However, the potential benefits of the technology envisioned by Langmuir and Blodgett in the 1930s have yet to be fully realized. Problems of reproducibility and defects and the lack of basic understanding of the packing of complex molecules in thin films have continued to thwart practical applications of Langmuir-Blodgett films and devices made from such films. However, modern high-resolution x-ray diffraction and scanning probe microscopy have proven to be ideal tools to resolve many of the basic questions involving thin organic films. Here, studies are presented of molecular order and organization in thin films of fatty acid salts, the prototypical system of Katharine Blodgett. Even these relatively simple systems present liquid, hexatic, and crystalline order; van der Waals and strained layer epitaxy on various substrates; wide variations in crystal symmetry and interfacial area with counterions; modulated superstructures; and coexisting lattice structures. The wide variety of possible structures presents both a challenge and an opportunity for future molecular design of organic thin-film devices.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zasadzinski, J A -- Viswanathan, R -- Madsen, L -- Garnaes, J -- Schwartz, D K -- GM 47334/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1994 Mar 25;263(5154):1726-33.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemical and Nuclear Engineering, University of California, Santa Barbara 93106.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8134836" target="_blank"〉PubMed〈/a〉
    Keywords: *Chemistry, Physical ; Lipids/*chemistry ; Membranes, Artificial ; Molecular Structure ; Physicochemical Phenomena ; Polymers/*chemistry ; Proteins/*chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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