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首页> 外文期刊>Food microbiology >Hydrophobicity of abiotic surfaces governs droplets deposition and evaporation patterns
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Hydrophobicity of abiotic surfaces governs droplets deposition and evaporation patterns

机译：非生物表面的疏水性治理液滴沉积和蒸发模式

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摘要

Surface contamination with droplets containing bacteria is of concern in the food industry and other environments where hygiene control is essential. Deposition patterns after the drying of contaminated droplets is affected by numerous parameters. The present study evaluated the rate of evaporation and the shape of deposition patterns after the drying of water droplets on a panel of materials with different surface properties (topography, hydrophobicity). The influence of the particle properties (in this study 1 μm-microspheres and two bacterial spores) was also investigated. Polystyrene microspheres were hydrophobic, while Bacillus spores were hydro-philic or hydrophobic, and surrounded by different surface features. In contrast to material topography, hydrophobicity was shown to deeply affect droplet evaporation, with the formation of small, thick deposits with microspheres or hydrophilic spores. Among the particle properties, the spore morphology (size and round/ovoid shape) did not clearly affect the deposition pattern. Conversely, hydrophobic spores aggregated to form clusters, which quickly settled on the materials and either failed to migrate, or only migrated to a slight extent on the surface, resulting in a steady distribution of spores or spore clusters over the whole contaminated area.Adherent bacteria or spores are known to be highly resistant to many stressful environmental conditions. In view of all the quite different patterns obtained following drying of spore-containing droplets, it seems likely that some of these would entail enhanced resistance to hygienic processes.
机译：含有细菌的液滴的表面污染是在食品工业和其他环境中关注的是卫生控制至关重要的环境。污染液滴干燥后的沉积图案受许多参数的影响。本研究评估了在具有不同表面性质（地形，疏水性）的材料板上的水滴后蒸发速度和沉积图案的形状。还研究了颗粒性质（在本研究中的1μM-微球和两个细菌孢子）的影响。聚苯乙烯微球是疏水的，而枯草芽孢杆菌孢子是水性的或疏水性的，并被不同的表面特征包围。与材料形貌相反，显示疏水性深深地影响液滴蒸发，形成小，厚的沉积物，具有微球或亲水性孢子。在颗粒性质中，孢子形态（尺寸和圆形/卵形形状）没有清楚地影响沉积图案。相反，聚集疏水性孢子以形成簇，它们快速沉淀在材料上，并且未能迁移，或者仅在表面上迁移到略微程度，导致整个受污染的区域上的孢子或孢子簇的稳定分布。阴毛细菌已知孢子是对许多压力环境条件具有高度抗性的。鉴于在含孢子液滴干燥后获得的所有相当不同的图案，似乎有些这些可能需要增强对卫生过程的抵抗力。

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