Template-Induced Enhanced Ordering under Confinement

We report a surprisingly strong ordering of Si−(CH3)2 groups upon confinement between two surfaces, an oxidized poly(dimethyl siloxane) (PDMSox) elastomer and a methyl-terminated self-assembled monolayer (octadecyltrichlorosilane (OTS)) on sapphire substrates. This enhanced ordering is induced by th...

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Bibliographic Details
Published in:Langmuir 2005-11, Vol.21 (23), p.10316-10319
Main Authors: Yurdumakan, Betül, Harp, Gary P, Tsige, Mesfin, Dhinojwala, Ali
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
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Summary:We report a surprisingly strong ordering of Si−(CH3)2 groups upon confinement between two surfaces, an oxidized poly(dimethyl siloxane) (PDMSox) elastomer and a methyl-terminated self-assembled monolayer (octadecyltrichlorosilane (OTS)) on sapphire substrates. This enhanced ordering is induced by the template of ordered methyl groups of OTS and is not observed for other surfaces (fluorinated monolayers and sapphire substrates). This strong ordering is reminiscent of layering observed for confined symmetric molecules between two mica surfaces but was expected to vanish between rough macroscopic surfaces. These results provide new insights on confined structure at the interface between two solids and are important in the understanding of surface-controlled processes of practical importance.
ISSN:0743-7463
1520-5827
DOI:10.1021/la051760w