Charge regulation in ionic solutions: thermal fluctuations and Kirkwood-Schumaker interactions

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Nataša Adžić, Rudolf Podgornik

Abstract

We study the behavior of two macroions with dissociable charge groups, regulated by local variables such as pH and electrostatic potential, immersed in a monovalent salt solution, considering cases where the net charge can either change sign or remain of the same sign depending on these local parameters. The charge regulation in both cases is described by the proper free-energy function for each of the macroions, while the coupling between the charges is evaluated on the approximate Debye-Hückel level. The charge correlation functions and the ensuing charge fluctuation forces are calculated analytically and numerically. Strong attraction between like-charged macroions is found close to the point of zero charge, specifically due to asymmetric, anticorrelated charge fluctuations of the macroion charges. The general theory is then implemented for a system of two proteinlike macroions, generalizing the form and magnitude of the Kirkwood-Schumaker interaction.

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Citations

Nov 26, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Gregor TrefaltMichal Borkovec
Jul 25, 2015·The Journal of Physical Chemistry. B·Dejan ArzenšekRudolf Podgornik
Apr 19, 2016·The Journal of Physical Chemistry. B·Emilie PurvineNathan Andrew Baker
Jun 10, 2016·The Journal of Chemical Physics·Nataša Adžić, Rudolf Podgornik
Jan 13, 2018·Soft Matter·Arghya MajeeRudolf Podgornik
Mar 23, 2018·Physical Chemistry Chemical Physics : PCCP·Mohsen Moazzami-GudarziMichal Borkovec
Dec 12, 2017·Physical Chemistry Chemical Physics : PCCP·Alexander M SmithMichal Borkovec
Jun 1, 2018·Soft Matter·Kyohei Takae, Hajime Tanaka
Aug 23, 2019·Physical Chemistry Chemical Physics : PCCP·Mojtaba FarrokhbinGregor Trefalt
Jun 25, 2020·Physical Chemistry Chemical Physics : PCCP·Yury A Budkov
Jun 17, 2018·Physical Review. E·Derek Frydel, Rudolf Podgornik
Dec 7, 2019·Physical Review Letters·Amin BakhshandehYan Levin
Dec 25, 2019·Physical Review. E·Arghya MajeeRudolf Podgornik
Aug 15, 2020·The European Physical Journal. E, Soft Matter·P Acharya, A W C Lau
Nov 23, 2017·Soft Matter·James E HallettPaul Bartlett
Nov 6, 2018·The Journal of Chemical Physics·Anže Lošdorfer Božič, Rudolf Podgornik
Jan 20, 2018·Physical Review. E·Christopher W WahleGeorge M Thurston
Apr 21, 2018·Journal of Colloid and Interface Science·Takuya SugimotoGregor Trefalt
Apr 6, 2018·ACS Applied Materials & Interfaces·Mario ŠpadinaKlemen Bohinc
Nov 17, 2021·The Journal of Physical Chemistry. B·Anže Božič, Rudolf Podgornik

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