当前位置：
X-MOL 学术
›
ACS Earth Space Chem.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Probing Heterogeneous Efflorescence of Mars-Relevant Salts with an Optical Levitator
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-09-23 , DOI: 10.1021/acsearthspacechem.0c00161 Shuichi B. Ushijima 1, 2 , Raina V. Gough 1, 2 , Margaret A. Tolbert 1, 2
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-09-23 , DOI: 10.1021/acsearthspacechem.0c00161 Shuichi B. Ushijima 1, 2 , Raina V. Gough 1, 2 , Margaret A. Tolbert 1, 2
Affiliation
|
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)2 induced by contact with a crystal of itself, NaCl, (NH4)2SO4, montmorillonite, and Mojave Mars Simulant (MMS) at room temperature. NaCl and (NH4)2SO4 were chosen to analyze the effect of crystal lattice on heterogeneous efflorescence. In addition, contact efflorescence of Ca(ClO4)2 and CaCl2 by 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 MgCl2 but 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.
中文翻译：
用光学悬浮剂探测火星相关盐的非均相花序
火星表面和地下存在液态水引起了人们的兴趣，因为众所周知，液态水是生命必不可少的。虽然纯液态水在当今的火星上通常不稳定，但是具有低共晶温度的吸湿盐的盐水在火星溶胶的某些时期可能是稳定的。这些盐的研究集中在它们的均相转变上，但火星土壤可能对盐水稳定性的影响尚不充分。在这里，我们使用光学悬浮法研究了与自身晶体NaCl，（NH 4）2 SO 4的接触引起的Mg（ClO 4）2的异质风化。，蒙脱石和莫哈韦沙漠火星模拟物（MMS）在室温下。选择NaCl和（NH 4）2 SO 4来分析晶格对非均质风化的影响。另外，研究了蒙脱石对Ca（ClO 4）2和CaCl 2的接触风化。与蒙脱石接触不会影响所有三种盐水的稳定性。浸没的异质颗粒还可以诱导液滴内的风化。考察了蒙脱石浸没的三种盐水和MgCl 2的效果，以及浸没MMS探寻了Mg（ClO 4）2的效果。。蒙脱土的浸没颗粒增加了MgCl 2的风化相对湿度，但不影响其他盐水。蒙脱土作为非均质核的惰性表明了在火星上盐水稳定的可能性，因为即使与颗粒接触或覆盖土壤颗粒的盐颗粒也可以维持盐水而不受土壤干扰。
更新日期：2020-11-19
中文翻译：
用光学悬浮剂探测火星相关盐的非均相花序
火星表面和地下存在液态水引起了人们的兴趣，因为众所周知，液态水是生命必不可少的。虽然纯液态水在当今的火星上通常不稳定，但是具有低共晶温度的吸湿盐的盐水在火星溶胶的某些时期可能是稳定的。这些盐的研究集中在它们的均相转变上，但火星土壤可能对盐水稳定性的影响尚不充分。在这里，我们使用光学悬浮法研究了与自身晶体NaCl，（NH 4）2 SO 4的接触引起的Mg（ClO 4）2的异质风化。，蒙脱石和莫哈韦沙漠火星模拟物（MMS）在室温下。选择NaCl和（NH 4）2 SO 4来分析晶格对非均质风化的影响。另外，研究了蒙脱石对Ca（ClO 4）2和CaCl 2的接触风化。与蒙脱石接触不会影响所有三种盐水的稳定性。浸没的异质颗粒还可以诱导液滴内的风化。考察了蒙脱石浸没的三种盐水和MgCl 2的效果，以及浸没MMS探寻了Mg（ClO 4）2的效果。。蒙脱土的浸没颗粒增加了MgCl 2的风化相对湿度，但不影响其他盐水。蒙脱土作为非均质核的惰性表明了在火星上盐水稳定的可能性，因为即使与颗粒接触或覆盖土壤颗粒的盐颗粒也可以维持盐水而不受土壤干扰。
京公网安备 11010802027423号