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Title: Discriminative ionic capabilities on hydrogen-bond transition from the mode of ordinary water to (Mg, Ca, Sr)(Cl, Br)₂ hydration
Authors: Fang, Hengxin
Tang, Zhixu
Liu, Xinjuan
Huang, Yongli
Sun, Changqing
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Fang, H., Tang, Z., Liu, X., Huang, Y. & Sun, C. (2019). Discriminative ionic capabilities on hydrogen-bond transition from the mode of ordinary water to (Mg, Ca, Sr)(Cl, Br)₂ hydration. Journal of Molecular Liquids, 279, 485-491.
Journal: Journal of Molecular Liquids 
Abstract: It has been a long pursuit to discriminate the ionic roles of mono- and di-valent salt solutions in modulating the hydrogen bonding network and solution properties. We attended this issue by examining the effect of concentrated YX 2 (Y[dbnd]Mg, Ca, Sr; X[dbnd]Cl, Br) solvation on O:H–O bonds transition from the mode of ordinary water to hydration in terms of the number fraction f YX2 (C) and the segmental O:H–O bond phonon stiffness shift Δω(C) with C being the solute concentration. The invariant df Y (C) / dC at C ≤ <0.05 suggests that the small Y 2+ forms a constantly-sized hydration droplet with weak responding to interference of other ions because its hydrating H 2 O dipoles screen mostly its electric field. However, the number inadequacy of the highly-ordered hydrating H 2 O dipoles partially screens the large X − . The X − ↔ X − electrostatic repulsion weakens its electric field. The concentration-trend consistency of the f YX2 (C), the solution conductivity σ YX2 (C), and surface stress (contact angle) θ YX2 (C) for YX 2 solutions clarifies their common origin of ionic polarization. However, the Jones–Dale notion disobedience of the viscosity η YX2 (C) suggests the dominance of the inter-ion repulsion.
ISSN: 0167-7322
DOI: 10.1016/j.molliq.2019.01.147
Rights: © 2019 Elsevier B.V. All rights reserved. This paper was published in Journal of Molecular Liquids and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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