Future long-duration human spaceflight calls for developments to limit biocontamination of the surface habitats. The MATISS experiment tests surface treatments in the ISS’s atmosphere. Four sample holders were mounted with glass lamella with hydrophobic coatings, and exposed in the Columbus module for ~6 months. About 7800 particles were detected by tile scanning optical microscopy (×3 and ×30 magnification) indicating a relatively clean environment (a few particles per mm²), but leading to a significant coverage-rate (>2% in 20 years). Varied shapes were displayed in the coarse (50–1500 µm²) and fine (0.5–50 µm²) area fractions, consistent with scale dices (tissue or skin) and microbial cells, respectively. The 200–900 µm² fraction of the coarse particles was systematically higher on FDTS and SiOCH than on Parylene, while the opposite was observed for the <10 µm² fraction of the fine particles. This trend suggests two biocontamination sources and a surface deposition impacted by hydrophobic coatings.

未来长时间的人类太空飞行需要发展以限制地表生境的生物污染。MATISS实验在ISS大气层中测试表面处理。将四个样品架与带有疏水涂层的玻璃薄板一起安装，并在哥伦布模块中暴露约6个月。通过瓷砖扫描光学显微镜（×3和×30放大倍率）检测到约7800个颗粒，表明环境相对清洁（每mm ²几个颗粒），但覆盖率却很高（20年内> 2％）。粗略（50–1500 µm ²）和细密（0.5–50 µm ²）区域显示出各种形状，分别与鳞片（组织或皮肤）和微生物细胞一致。200–900 µm ²在FDTS和SiOCH上，粗颗粒的分数总体上高于聚对二甲苯，而在<10 µm ²的细颗粒中观察到相反。这种趋势表明有两个生物污染源和一个受疏水涂层影响的表面沉积。