Experimental investigation on silica dust lofting due to charging within micro-cavities and surface electric field in the vacuum chamber

Örger, Necmi Cihan; Toyoda, Kazuhiro; Masui, Hirokazu; Cho, Mengu

doi:10.1016/j.asr.2019.01.045

Cited by 26 publications

(8 citation statements)

References 26 publications

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“…The mineral for the experiment was obtained from Nanoshel LLC (Wilmington, DE, USA) and contained >99% of Al 2 [(OH) 2 Si 4 O 10 ]·nH 2 O. The analog of lunar dust is represented by microspheres of silicon oxide up to 50 μm in size [ 51 ] and is similar to the simulators of lunar dust previously used in a number of other studies [ 52 ]. It was supplied by American Elements (Los Angeles, CA, USA) and contained >99.9% of SiO 2 .…”

Section: Methodsmentioning

confidence: 99%

Effects of Radiation Intensity, Mineral Matrix, and Pre-Irradiation on the Bacterial Resistance to Gamma Irradiation under Low Temperature Conditions

et al. 2021

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Ionizing radiation is one of the main factors limiting the survival of microorganisms in extraterrestrial conditions. The survivability of microorganisms under irradiation depends significantly on the conditions, in which the irradiation occurs. In particular, temperature, pressure, oxygen and water concentrations are of great influence. However, the influence of factors such as the radiation intensity (in low-temperature conditions) and the type of mineral matrix, in which microorganisms are located, has been practically unstudied. It has been shown that the radioresistance of bacteria can increase after their exposure to sublethal doses and subsequent repair of damage under favorable conditions, however, such studies are also few and the influence of other factors of extraterrestrial space (temperature, pressure) was not studied in them. The viability of bacteria Arthrobacter polychromogenes, Kocuria rosea and Xanthomonas sp. after irradiation with gamma radiation at a dose of 1 kGy under conditions of low pressure (1 Torr) and low temperature (−50 °C) at different radiation intensities (4 vs. 0.8 kGy/h) with immobilization of bacteria on various mineral matrices (montmorillonite vs. analogue of lunar dust) has been studied. Native, previously non-irradiated strains, and strains that were previously irradiated with gamma radiation and subjected to 10 passages of cultivation on solid media were irradiated. The number of survived cells was determined by culturing on a solid medium. It has been shown that the radioresistance of bacteria depends significantly on the type of mineral matrix, on which they are immobilized, wherein montmorillonite contributes to an increased survivability in comparison with a silicate matrix. Survivability of the studied bacteria was found to increase with decreasing radiation intensity, despite the impossibility of active reparation processes under experimental conditions. Considering the low intensity of radiation on various space objects in comparison with radiobiological experiments, this suggests a longer preservation of the viable microorganisms outside the Earth than is commonly believed. An increase in bacterial radioresistance was revealed even after one cycle of irradiation of the strains and their subsequent cultivation under favourable conditions. This indicates the possibility of hypothetical microorganisms on Mars increasing their radioresistance.

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Section: Methodsmentioning

confidence: 99%

Effects of Radiation Intensity, Mineral Matrix, and Pre-Irradiation on the Bacterial Resistance to Gamma Irradiation under Low Temperature Conditions

et al. 2021

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“…Computer simulations [Zimmerman et al, 2016] have since also demonstrated charging enhancement due to strong grain-scale electric fields in the regolith. Since then, additional laboratory experiments have produced results in support of the Patched Charge Model [Schwan et al, 2017;Hood et al, 2018;Dove et al, 2018;Orger et al, 2019].…”

Section: Current Understandingmentioning

confidence: 99%

Electrostatic Dust Transport Effects on Shaping the Surface Properties of the Moon and Airless Bodies across the Solar System

Wang

Blewett

Kramer

et al. 2021

Bulletin of the AAS

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Electrostatic dust charging and subsequent transport on the lunar surface due to direct exposure to the solar wind plasma and solar radiation is a more than five-decade-old problem. Dust activity has been suggested as an explanation for several lunar surface observations from the beginning in the Apollo era. Beyond the Moon, related observations indicate that this electrostatic process may be a universal phenomenon on airless bodies across the solar system. Recent studies have made important breakthroughs in understanding the fundamentals of dust charging, mobilization and lofting mechanisms, offering strong support for its occurrence on the surfaces of airless bodies. This white paper reviews historical and recent observational evidence, reports recent findings, examines knowledge gaps and outstanding science questions, and provides recommendations for future studies. Special attention is given to in situ measurements over the next decade in order to ultimately solve the outstanding questions and, more importantly, understand the primary implications for the evolution of the surfaces of the Moon and other airless bodies across the solar system. Furthermore, potential risks posed by electrostatic dust transport to future surface exploration of these bodies, especially any long-term human presence on the lunar surface, needs to be well characterized in order to define and implement appropriate risk mitigation strategies and methods through proper systems design and testing.

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“…Furthermore, photoelectrons that are emitted from the particles collide with neighboring particles, which can lead to the emission of secondary electrons and result in further particle charging [25,26].…”

Section: Nomenclaturementioning

confidence: 99%

Charging and Levitation of Particles Using UV Irradiation and Electric Field

Shoyama

Yoshioka

Matsusaka

2022

IEEE Trans. on Ind. Applicat.

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Experimental investigation on silica dust lofting due to charging within micro-cavities and surface electric field in the vacuum chamber

Cited by 26 publications

References 26 publications

Effects of Radiation Intensity, Mineral Matrix, and Pre-Irradiation on the Bacterial Resistance to Gamma Irradiation under Low Temperature Conditions

Effects of Radiation Intensity, Mineral Matrix, and Pre-Irradiation on the Bacterial Resistance to Gamma Irradiation under Low Temperature Conditions

Electrostatic Dust Transport Effects on Shaping the Surface Properties of the Moon and Airless Bodies across the Solar System

Charging and Levitation of Particles Using UV Irradiation and Electric Field

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