Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/95398
Title: Demonstration of high-resolution capability of chemical force titration via study of acid/base properties of a patterned self-assembled monolayer
Authors: He, Hui-Xin
Huang, Wei
Zhang, Hua
Li, Qi Guang
Li, Sam Fong Yau
Liu, Zhong-Fan
Keywords: DRNTU::Engineering::Materials
Issue Date: 2000
Source: He, H. X., Huang, W., Zhang, H., Li, Q. G., Li, S. F. Y., & Liu, Z. F. (2000). 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.
Series/Report no.: Langmuir
Abstract: An 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.
URI: https://hdl.handle.net/10356/95398
http://hdl.handle.net/10220/8629
ISSN: 0743-7463
DOI: 10.1021/la990021a
Rights: Copyright © 2000 American Chemical Society.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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