Chen Gexin, Beving Derek E, Bedi Rajwant S, Yan Yushan S, Walker Sharon L
Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, California 92521, USA.
Langmuir. 2009 Feb 3;25(3):1620-6. doi: 10.1021/la803285j.
In this study, the impact of zeolite thin film coatings on bacterial deposition and "biofouling" of surfaces has been investigated in an aqueous environment. The synthesis of two types of zeolite coatings, ZSM-5 coated on aluminum alloy and zeolite A coated on stainless steel, and the characterization of the coated and bare metal surfaces are described. The extent of cell deposition onto the bare and zeolite-coated aluminum alloy and stainless steel surfaces is investigated in a parallel plate flow chamber system under a laminar flow conditions. The initial rates of bacterial transfer to the various surfaces are compared by utilizing a marine bacterium, Halomonas pacifica g, under a range of ionic strength conditions. H. pacifica g deposited onto bare metal surfaces to a greater extent as compared with cells deposited onto the zeolite coatings. The surface properties found to have the most notable effect on attachment are the electrokinetic and hydrophobicity properties of the metal and zeolite-coated surfaces. These results suggest that a combination of two chemical mechanisms-hydrophobic and electrostatic interactions-contribute to the antifouling nature of the zeolite surface. Additional observations on the relative role of the hydrodynamic and physical phenomena are also discussed.
在本研究中，已在水环境中研究了沸石薄膜涂层对表面细菌沉积和“生物污垢”的影响。描述了两种类型的沸石涂层的合成，即涂覆在铝合金上的ZSM-5和涂覆在不锈钢上的沸石A，以及涂覆和未涂覆金属表面的表征。在层流条件下的平行板流动腔系统中，研究了细胞在未涂覆和涂覆沸石的铝合金及不锈钢表面上的沉积程度。通过利用海洋细菌太平洋嗜盐单胞菌g，在一系列离子强度条件下，比较了细菌向各种表面转移的初始速率。与沉积在沸石涂层上的细胞相比，太平洋嗜盐单胞菌g在未涂覆金属表面上的沉积程度更大。发现对附着影响最显著的表面性质是金属和涂覆沸石表面的电动性质和疏水性。这些结果表明，疏水和静电相互作用这两种化学机制的结合有助于沸石表面的防污特性。还讨论了关于流体动力学和物理现象相对作用的其他观察结果。
