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2015 ; 10
(7
): e0128602
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Origin of Hofmeister Effects for Complex Systems
#MMPMID26200350
Tian R
; Yang G
; Tang Y
; Liu X
; Li R
; Zhu H
; Li H
PLoS One
2015[]; 10
(7
): e0128602
PMID26200350
show ga
Hofmeister effects have been recognized as important as Mendel's work was to
genetics while remain largely controversial, especially for the mechanistic
aspects. Here we demonstrated that complex colloids in electrolyte solutions show
resembling aggregation kinetics as model colloid, and then quantitatively
evaluated the resulting Hofmeister effects. Mechanism for the aggregation of
complex colloids has been proposed that is closely associated with the charges of
their constituents; despite that, electrostatic interactions play a minor role
while polarization effect is evidenced to be the driving force for the
aggregation processes. Polarization effect is further ascribed to arouse the
resulting Hofmeister effects, which is supported by the fine correlation of
activation energies vs. polarizability data of different alkali ions and the
calculations of dipole moments for minerals with different charges and adsorbed
alkali ions. Because of neglecting polarization effect, the prevailing DLVO
theory is not sufficient to describe Hofmeister effects that are ubiquitous in
nature. We speculate that polarization effect should also be responsible for
Hofmeister effects of other charged systems such as proteins and membranes.
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