Please use this identifier to cite or link to this item: https://doi.org/10.1021/la990021a
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dc.titleDemonstration of high-resolution capability of chemical force titration via study of acid/base properties of a patterned self-assembled monolayer
dc.contributor.authorHe, H.-X.
dc.contributor.authorHuang, W.
dc.contributor.authorZhang, H.
dc.contributor.authorLi, Q.G.
dc.contributor.authorLi, S.F.Y.
dc.contributor.authorLiu, Z.F.
dc.date.accessioned2014-10-16T08:25:21Z
dc.date.available2014-10-16T08:25:21Z
dc.date.issued2000-01-25
dc.identifier.citationHe, H.-X., Huang, W., Zhang, H., Li, Q.G., Li, S.F.Y., Liu, Z.F. (2000-01-25). Demonstration of high-resolution capability of chemical force titration via study of acid/base properties of a patterned self-assembled monolayer. Langmuir 16 (2) : 517-521. ScholarBank@NUS Repository. https://doi.org/10.1021/la990021a
dc.identifier.issn07437463
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/93528
dc.description.abstractAn experimental approach for probing the resolution of chemical force titration is reported here. A self-assembled monolayer (SAM) patterned with COOH and CH3 groups was used as the model surface, and its local dissociation property was studied by both chemical force titration and contact angle titration. The dissociation constant (pK1/2) estimated by chemical force titration was found to be sensitive to the surface location. In the COOH region, chemical force titration gave a pK1/2 value of 5.4, identical with the value obtained on a pure, unpatterned COOH SAM, while in the CH3 region, the force curves varied greatly from site to site even in the same pH solution, indicating the mixed film nature being originated from the microcontact printing process. In contrast, contact angle titration generates a fixed pK1/2 value of 11.0 on the patterned surface, completely different from the force titration results. This study demonstrates that chemical force titration indeed has a spatially resolved capability, with a lateral spatial resolution of better than 1 μm, and is more effective for detecting the local properties of chemically inhomogeneous surfaces.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1021/la990021a
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentCHEMISTRY
dc.description.doi10.1021/la990021a
dc.description.sourcetitleLangmuir
dc.description.volume16
dc.description.issue2
dc.description.page517-521
dc.description.codenLANGD
dc.identifier.isiut000084890100036
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