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首页> 外文会议>2014 IEEE/OES Baltic International Symposium : Measuring and modeling of multi-scale interactions in the marine environment: Book of abstracts >On-line and in-situ kinetics studies of biofilm formation on solid marine submerged substrata by contact angle wettability and microscopic techniques
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On-line and in-situ kinetics studies of biofilm formation on solid marine submerged substrata by contact angle wettability and microscopic techniques

机译：接触角润湿性和显微技术在线和原位动力学研究固体海底生物膜的形成

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摘要

The characterization of wetting properties (by contact angles CA) of several undersea artificial (glass plates) and natural(stones, sand layers, soft-bottom structures, aquatic macrophytes, sediments) solid substrata in the Baltic Sea brackish water (Gulf of Gdansk) were performed. The apparent surface free energy γ;SV and other interfacial interaction parameters: 2D film pressure Π;, workof adhesion WA, and of spreading WS; dispersive term γ;SVd of γ;SV were derived from CAH approach developed by Chibowski (2003)with only three measurable quantities: surface tension of the probe liquid γ;LV and its advancing □A and receding □R contact anglehysteresis (CAH = □A − □R). The most useful technique to measure in situ CAs giving reproducible and accurate values turned out acaptive bubble method, for fully hydrated interfacial layers of highly hydrophilic and porous nature met at seabed. Since the outermostsurface of the submerged substrate is sensed with the presented CA captive bubble technique (captive bubble syringe set-up + USBmicroscope system was assigned to field work), surface evolution of the formed biofilm structure can be monitored on-line and in-situ atdifferent stages of its formation from seconds (conditioning film) to weeks (macrofouling). In addition to surface free energy, otherfactors, including surface charge, surface roughness, temperature, contact time and fluid shear flow velocity turned out to havesignificant influence on the adhesion of biofouling. Views of the glass biofouled slides taken with confocal scanning laser microscopyallowed 3D biofilm architecture on glass to be visualized and quantified. The evolution of the wettability parameters allowed toindentify the particular biofilm states: best release properties, maximum organic matte- accumulation, mature film dispersion. Thepresence of adsorbed organic matter layer lead to the surface hydrophobization (CA ↑, γ;SV ↓, WA ↓, WS more negative).
机译：波罗的海苦咸水（格但斯克湾）中几种海底人工（玻璃板）和天然（石头，沙层，软底结构，水生植物，沉积物）固体基质的润湿特性（通过接触角CA）表征被执行。表观表面自由能γ; SV和其他界面相互作用参数：2D膜压力Π;、附着功WA和扩展WS; γ; SV的色散项γ; SVd源自Chibowski（2003）开发的CAH方法，仅可测量三个量：探针液体γ的表面张力; LV及其前进□A和后退□R接触角滞后（CAH =□ A-□R）。对于在海底遇到的具有高度亲水性和多孔性的完全水合界面层，最有效的测量原位CA的技术可提供可重现和准确的值，因此采用了气泡法。由于使用提出的CA捕获气泡技术（将捕获气泡注射器设置+ USB显微镜系统分配给现场工作）来检测浸没基质的最外表面，因此可以在线和就地监测形成的生物膜结构的表面演变。从数秒（调理膜）到数周（宏观污垢）的不同形成阶段。除了表面自由能之外，其他因素，包括表面电荷，表面粗糙度，温度，接触时间和流体剪切流速也被证明对生物污损的附着力有重要影响。使用共聚焦扫描激光显微镜拍摄的玻璃生物污染载玻片的视图可对玻璃上的3D生物膜结构进行可视化和量化。润湿性参数的演变可以确定特定的生物膜状态：最佳释放性能，最大的有机无光积累，成熟的膜分散性。吸附的有机物层的存在导致表面疏水化（CA↑，γ； SV↓，WA↓，WS更负）。

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