| The AFM measured force required to rupture the dithiolate linkage of thioctic acid to gold is less than the rupture force of a simple gold-alkyl thiolate bond. | |
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MedLine Citation:
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PMID: 16342971 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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We show with atomic force microscopy that thioctic acid, a spatially constrained system with two sulfur linkages to gold, is less stable to tensile stress than a thiolate with a single attachment to gold. The force required to remove the dithiolate-linked thioctic acid was 0.31+/-0.13 nN, whereas the force required to remove a simple thiolate from the gold substrate was 1.05+/-0.29 nN. These results suggest that SAMs of densely packed or polypodal thiols may be substantially less stable under tensile stress than previously recognized and that the additional thiolate linkages may not only fail to increase the overall strength of attachment but could actually reduce it. |
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Authors:
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Kevin C Langry; Timothy V Ratto; Robert E Rudd; Michael W McElfresh |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Langmuir : the ACS journal of surfaces and colloids Volume: 21 ISSN: 0743-7463 ISO Abbreviation: Langmuir Publication Date: 2005 Dec |
Date Detail:
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Created Date: 2005-12-13 Completed Date: 2007-07-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882736 Medline TA: Langmuir Country: United States |
Other Details:
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Languages: eng Pagination: 12064-7 Citation Subset: - |
Affiliation:
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Chemistry and Materials Science Directorate and Physics and Advanced Technologies Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551, USA. langry1@llnl.gov |
Export Citation:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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