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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.6b04314
|2 doi
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|a eng
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|a Teh, E-Jen
|e verfasserin
|4 aut
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|a Surface Forces and Rheology of Titanium Dioxide in the Presence of Dicarboxylic Acids
|b From Molecular Interactions to Yield Stress
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|c 2017
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 27.04.2018
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|a Date Revised 27.04.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The surface forces and yield stress of titanium dioxide were measured in the presence of dicarboxylic acids in order to understand the molecular basis for the observed rheological response. The yield stress was measured using the static vane technique, and the surface forces were characterized using an atomic force microscope. The trans and cis isomers of butenedioic acid (fumaric and maleic acids, respectively) were chosen as the relative orientation of the carboxylic groups differs substantially. This enables us to test the hypothesis that an increase in adhesion leads to an increase in yield stress as a consequence of the dicarboxylic acids participating in highly directed bridging. Unlike fumaric acid, maleic acid caused a yield stress reduction in the titanium dioxide suspensions. Surface force measurements between approaching surfaces found that at low pH, fumaric and maleic acids did not induce any additional attraction between the titanium dioxide surfaces. However, significant differences in adhesion were observed, which can be explained in terms of the configuration of the acids at the surface. The observations are consistent with highly directed bridging in the presence of fumaric acid but not in the presence of maleic acid due to the molecular architecture of the dicarboxylic acids
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Leong, Yee-Kwong
|e verfasserin
|4 aut
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|a Craig, Vincent S J
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 33(2017), 6 vom: 14. Feb., Seite 1496-1506
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:33
|g year:2017
|g number:6
|g day:14
|g month:02
|g pages:1496-1506
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|u http://dx.doi.org/10.1021/acs.langmuir.6b04314
|3 Volltext
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