嫦娥六号月壤为何有些黏？中国科学家最新研究揭晓答案

Core Viewpoint - The research conducted by the team from the Chinese Academy of Sciences reveals the physical mechanisms behind the higher viscosity of lunar soil samples collected by the Chang'e 6 mission, compared to those from the Chang'e 5 mission, providing insights into the unique properties of lunar regolith [1][4]. Group 1: Research Findings - The study published in the journal Nature Astronomy confirms that the lunar soil from the Chang'e 6 mission exhibits a significantly higher repose angle than samples from the lunar front, indicating its flow characteristics are closer to those of viscous soils on Earth [3][4]. - The research team identified that the increased repose angle is primarily influenced by the synergistic effects of friction, van der Waals forces, and electrostatic forces among particles, with friction being positively correlated with particle surface roughness [4][6]. - A critical "particle size threshold" was discovered, where the influence of van der Waals and electrostatic forces on the repose angle becomes significant when the D60 value (the particle size at which 60% of the total weight is below) is less than approximately 100 micrometers [6]. Group 2: Implications for Lunar Research - The team conducted high-resolution CT scans of the Chang'e 6 lunar soil samples, analyzing over 290,000 particles, and found that the D60 value is the smallest at 48.4 micrometers, indicating finer and more complex particle shapes compared to samples from Chang'e 5 and Apollo missions [7][9]. - The unique characteristics of the Chang'e 6 lunar soil, including its fine and rough particles, enhance the contributions of friction, van der Waals, and electrostatic forces, resulting in a higher repose angle and thus greater viscosity [7][9]. - This research provides a foundational scientific basis for future lunar exploration missions, including lunar base construction and resource utilization, contributing to advancements in lunar science and resource development [9].