Pressure-induced ion pairing in MgSO4 solutions: Implications for the oceans of icy worlds
Pressure-induced ion pairing in MgSO4 solutions: Implications for the oceans of icy worlds
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MgSO4 溶液中压力诱导的离子配对：对冰冷世界海洋的影响
DOI：
10.7185/geochemlet.1707
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
C. Manning
中科院分区：
文献类型：
--
作者：
C. Schmidt;C. Manning
在环境温度下，液态水在约0.2 GPa下从低密度动态结构转变为高密度动态结构。过渡持续在电解质溶液中，然而，其对溶质性质的影响是未知的。在21 °C和10 - 4 ~ 1.6GPa条件下，获得了0.5-2.0摩尔MgSO 4溶液的拉曼光谱.高于约0.4 GPa，我们观察到的MgSO 4接触离子对丰度与压力的增加，无论浓度。这种现象违反了溶解的盐在压缩时解离的一般规则，并且可能是由于氢键断裂增加而导致的在溶剂中随着压力的结构塌陷引起的。在高压水溶液中离子缔合的增加意味着，在给定的盐度下，在深而冷的行星海洋和孔隙沃茨中的高密度水将具有比以前认为的更低的离子强度和电导率。这种行为也将导致冥王星内部的海洋盐度更高，以及木星和土星最大的冰卫星，木卫三，木卫四和泰坦，或在系外行星水世界，通过增强海底硅酸盐风化。
At ambient temperature, liquid water transforms from a low-density to a high-density dynamic structure at ~0.2 GPa. The transition persists in electrolyte solutions; however, its effects on solute properties are unknown. We obtained Raman spectra of 0.5–2.0 molal MgSO 4 solutions at 21 °C and 10 -4 to ~1.6 GPa. Above about 0.4 GPa, we observed an increase in the MgSO 4 contact ion pair abundance with pressure, regardless of concentration. This phenomenon contravenes the general rule that dissolved salts dissociate upon compression, and is likely caused by the structural collapse in the solvent with pressure due to increased hydrogen-bond breaking. Increasing ion association in high-pressure aqueous solutions implies that, at a given salinity, high-density water in deep, cold planetary oceans and pore waters will possess lower ionic strength and electric conductivity than previously thought. This behaviour will also lead to higher ocean salinity in the interiors of Pluto and the largest icy moons of Jupiter and Saturn, Ganymede, Callisto, and Titan, or in exoplanet water-worlds, through enhancement of submarine silicate weathering.
宜居带中的水行星：大气化学、可观测特征以及 KEPLER-62e 和 -62f 的案例
DOI：
10.1088/2041-8205/775/2/l47
发表时间：
2013
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
Kaltenegger;Sasselov D;Rugheimer S.
通讯作者：
Rugheimer S.
实验%20测定%20of%20H2OâNaCl%20liquidi%20to%2025%20mass%%20NaCl%20and%201%204%20GPa:%20应用%20to%20the%20Jovian%20satellite%20欧洲
影响因子：
5
作者：
Valenti P;Bodnar R.J;Schmidt C.
通讯作者：
Schmidt C.
利用哈勃太空望远镜观测的极光椭圆体寻找木卫三的地下海洋
DOI：
10.1002/2014ja020778
发表时间：
2015
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
--
作者：
Duling;Strobel;Feldman;Hartkorn
通讯作者：
Hartkorn