TY - JOUR
T1 - The dielectric response of interfacial water - From the ordered structures to the single hydrated shell
AU - Feldman, Yuri
AU - Puzenko, Alexander
AU - Ben Ishai, Paul
AU - Gutina Greenbaum, Anna
PY - 2014/8
Y1 - 2014/8
N2 - Water is the universal solvent in nature. Does this imply, however, that its interaction with its environment is also a universal feature? While this question maybe too fundamental to be answered by one method only, we present evidence that the broadening of the dielectric spectra of water presents universal features of dipolar interactions with different types of matrixes. If in aqueous solutions the starting point of water's state can be considered as bulk, with only partial interactions with the solute, then the state of water adsorbed in heterogeneous materials is determined by various hydration centers of the inhomogeneous material (the matrix) and it is significantly different from the bulk. In both cases, the dielectric spectrum of water is symmetrical and can be described by the Cole-Cole (CC) function. The phenomenological model that describes a physical mechanism of the dipole-matrix interaction in complex systems underlying the CC behavior has been applied to water adsorbed in porous glasses. It was then extended to analyses of the dynamic and structural behavior of water in nonionic and ionic aqueous solutions. The same model is then used to analyze the CC relaxation processes observed in clays, aqueous solutions of nucleotides, and amino acids.
AB - Water is the universal solvent in nature. Does this imply, however, that its interaction with its environment is also a universal feature? While this question maybe too fundamental to be answered by one method only, we present evidence that the broadening of the dielectric spectra of water presents universal features of dipolar interactions with different types of matrixes. If in aqueous solutions the starting point of water's state can be considered as bulk, with only partial interactions with the solute, then the state of water adsorbed in heterogeneous materials is determined by various hydration centers of the inhomogeneous material (the matrix) and it is significantly different from the bulk. In both cases, the dielectric spectrum of water is symmetrical and can be described by the Cole-Cole (CC) function. The phenomenological model that describes a physical mechanism of the dipole-matrix interaction in complex systems underlying the CC behavior has been applied to water adsorbed in porous glasses. It was then extended to analyses of the dynamic and structural behavior of water in nonionic and ionic aqueous solutions. The same model is then used to analyze the CC relaxation processes observed in clays, aqueous solutions of nucleotides, and amino acids.
KW - Aqueous solutions
KW - Clays
KW - Cole-Cole function
KW - Dielectric spectroscopy
KW - Dipole-matrix interaction
UR - http://www.scopus.com/inward/record.url?scp=84905910864&partnerID=8YFLogxK
U2 - 10.1007/s00396-014-3296-7
DO - 10.1007/s00396-014-3296-7
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AN - SCOPUS:84905910864
SN - 0303-402X
VL - 292
SP - 1923
EP - 1932
JO - Colloid and Polymer Science
JF - Colloid and Polymer Science
IS - 8
ER -