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. 2017 Dec 27;4(1):2. doi: 10.3390/gels4010002

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(Color online) The diffusion coefficient D plotted as a function of (a) the dissociated fraction and (b) pH-pK_a. In all cases, the y-axis is rescaled with the value at lowest dissociation $α$ ≈ 0 or pH-pK_a ≈ −2.