Probing Heterogeneous Efflorescence of Mars-Relevant Salts with an Optical Levitator
Probing Heterogeneous Efflorescence of Mars-Relevant Salts with an Optical Levitator
复制标题
用光学悬浮器探测火星相关盐的异质风化
DOI：
10.1021/acsearthspacechem.0c00161
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发表时间：
2020
影响因子：
3.4
通讯作者：
Tolbert, Margaret A.
中科院分区：
文献类型：
--
作者：
Ushijima, Shuichi B.;Gough, Raina V.;Tolbert, Margaret A.
火星表面和次表面存在液态水一直是人们感兴趣的问题，因为液态水是我们所知的生命所必需的。虽然纯液态水在今天的火星上通常不稳定，但具有低共晶温度的吸湿盐卤水在火星溶胶的某些时期可能是稳定的。关于这些盐的研究主要集中在它们的均匀相变上，但火星土壤可能对卤水稳定性的影响还没有得到很好的证实。在这里，我们利用光学悬浮技术，在室温下研究了Mg(ClO_4)_2与晶体本身、氯化钠、(NH_4)_2SO_4、蒙脱石和莫哈韦火星模拟剂(MMS)接触而产生的非均相发光。以NaC l和(NH_4)_2SO_4为例，分析了晶格对非均相风化的影响。此外，还研究了蒙脱石对CaCl4和CaCl2的接触风化作用。三种卤水的稳定性都不受与蒙脱石接触的影响。浸没在水滴中的异质颗粒也可以从液滴中诱导风化。探讨了蒙脱石浸泡对三种卤水加氯化镁的影响，以及蒙脱石对氯化镁的浸泡效果。蒙脱土颗粒的浸泡增加了氯化镁的风化相对湿度，但对其他卤水的风化相对湿度没有影响。蒙脱石作为一种非均质核的不活动性支持了火星上卤水稳定的可能性，因为即使是接触或包裹土壤颗粒的盐粒也可以在不受土壤干扰的情况下维持卤水。
The presence of liquid water on the surface and subsurface of Mars has been of interest because liquid water is essential for life as we know it. While pure liquid water is typically not stable on present-day Mars, brines of hygroscopic salts with low eutectic temperatures could be stable during certain periods of a Martian sol. Studies on these salts have focused on their homogeneous phase transitions, but the impact that Martian soil may have on the brine stability is not well established. Here, using optical levitation, we examined heterogeneous efflorescence of Mg(ClO4)2induced by contact with a crystal of itself, NaCl, (NH4)2SO4, montmorillonite, and Mojave Mars Simulant (MMS) at room temperature. NaCl and (NH4)2SO4were chosen to analyze the effect of crystal lattice on heterogeneous efflorescence. In addition, contact efflorescence of Ca(ClO4)2and CaCl2by montmorillonite was studied. The stability of all three brines was unaffected by contact with montmorillonite. An immersed heterogeneous particle can also induce efflorescence from within a droplet. The effect of immersed montmorillonite was probed for all three brines plus MgCl2, and the effect of immersed MMS was probed for Mg(ClO4)2. The immersed particles of montmorillonite increased the efflorescence relative humidity of MgCl2but did not affect the other brines. The inactivity of montmorillonite as a heterogeneous nucleus supports the possibility of brine stability on Mars because even salt particles in contact with or coating soil grains may sustain a brine without interference from the soil.
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矿物粉尘颗粒引起的浸泡和接触风化。
影响因子：
2.9
作者：
S. Ushijima;R. Davis;M. Tolbert
通讯作者：
M. Tolbert
DOI：
--
发表时间：
2015
期刊：
--
影响因子：
--
作者：
L. Ojha;M. Wilhelm;S. Murchie;A. McEwen;J. James;Wray;J. Hanley;M. Masse;M. Chojnacki
通讯作者：
L. Ojha;M. Wilhelm;S. Murchie;A. McEwen;J. James;Wray;J. Hanley;M. Masse;M. Chojnacki
影响因子：
18.3
作者：
Martin-Torres, F. Javier;Zorzano, Maria-Paz;Vaniman, David
通讯作者：
Vaniman, David
影响因子：
1.8
作者：
Mithen, J. P.;Sear, R. P.
通讯作者：
Sear, R. P.