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Investigating the thermodynamic causes behind the anomalously large shifts in pKa values of benzoic acid-modified graphite and glassy carbon surfaces.

Abstract:

The difference between the values of 4-carboxyphenyl groups, covalently attached to either graphite (BAcarbon) or glassy carbon (BA-GC) surfaces, and benzoic acid in solution is explored using potentiometric titration and cyclic voltammetry. In solution, benzoic acid has a pKa of 4.20 at 25 degrees C. However, the observed pKa value on the graphitic surfaces shows significant deviations, with BAcarbon exhibiting a large shift to higher pKa values (pKa = 6.45) in contrast to BA-GC, which is sh...

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Publication status:
Published

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Publisher copy:
10.1021/la7005277

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Institution:
University of Oxford
Department:
Oxford, MPLS, Materials
Wildgoose, GG More by this author
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Chemistry, Physical and Theoretical Chem
Journal:
Langmuir : the ACS journal of surfaces and colloids
Volume:
23
Issue:
14
Pages:
7847-7852
Publication date:
2007-07-05
DOI:
EISSN:
1520-5827
ISSN:
0743-7463
URN:
uuid:c0e17cfa-9b32-4ace-8d3d-e3795c06eb3e
Source identifiers:
178554
Local pid:
pubs:178554
Language:
English

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