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• W2042885362 abstract "The chemistry underlying the aqueous dispersibility of graphene oxide (GO) and reduced graphene oxide (r-GO) is a key consideration in the design of solution processing techniques for the preparation of processable graphene sheets. Here, we use zeta potential measurements, pH titrations, and infrared spectroscopy to establish the chemistry underlying the aqueous dispersibility of GO and r-GO sheets at different values of pH. We show that r-GO sheets have ionizable groups with a single pK value (8.0) while GO sheets have groups that are more acidic (pK = 4.3), in addition to groups with pK values of 6.6 and 9.0. Infrared spectroscopy has been used to follow the sequence of ionization events. In both GO and r-GO sheets, it is ionization of the carboxylic groups that is primarily responsible for the build up of charge, but on GO sheets, the presence of phenolic and hydroxyl groups in close proximity to the carboxylic groups lowers the pKa value by stabilizing the carboxylate anion, resulting in superior water dispersibility ." @default.
• W2042885362 created "2016-06-24" @default.
• W2042885362 creator A5023347638 @default.
• W2042885362 creator A5029959351 @default.
• W2042885362 date "2012-03-15" @default.
• W2042885362 modified "2023-10-18" @default.
• W2042885362 title "Understanding Aqueous Dispersibility of Graphene Oxide and Reduced Graphene Oxide through p<i>K</i>_a Measurements" @default.
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• W2042885362 doi "https://doi.org/10.1021/jz300236w" @default.
• W2042885362 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26286412" @default.
• W2042885362 hasPublicationYear "2012" @default.
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