Ogawa Akiko, Kanematsu Hideyuki, Sano Katsuhiko, Sakai Yoshiyuki, Ishida Kunimitsu, Beech Iwona B, Suzuki Osamu, Tanaka Toshihiro
Department of Chemistry and Biochemistry, National Institute of Technology, Suzuka College, Suzuka 510-0294, Japan.
Department of Materials Science and Engineering, National Institute of Technology, Suzuka College, Suzuka 510-0294, Japan.
Materials (Basel). 2016 Jul 29;9(8):632. doi: 10.3390/ma9080632.
Biofouling often occurs in cooling water systems, resulting in the reduction of heat exchange efficiency and corrosion of the cooling pipes, which raises the running costs. Therefore, controlling biofouling is very important. To regulate biofouling, we focus on the formation of biofilm, which is the early step of biofouling. In this study, we investigated whether silver or copper nanoparticles-dispersed silane coatings inhibited biofilm formation in cooling systems. We developed a closed laboratory biofilm reactor as a model of a cooling pipe and used seawater as a model for cooling water. Silver or copper nanoparticles-dispersed silane coating (Ag coating and Cu coating) coupons were soaked in seawater, and the seawater was circulated in the laboratory biofilm reactor for several days to create biofilms. Three-dimensional images of the surface showed that sea-island-like structures were formed on silane coatings and low concentration Cu coating, whereas nothing was formed on high concentration Cu coatings and low concentration Ag coating. The sea-island-like structures were analyzed by Raman spectroscopy to estimate the components of the biofilm. We found that both the Cu coating and Ag coating were effective methods to inhibit biofilm formation in cooling pipes.
生物污垢经常发生在冷却水系统中，导致热交换效率降低以及冷却管道腐蚀，从而增加运行成本。因此，控制生物污垢非常重要。为了调节生物污垢，我们关注生物膜的形成，这是生物污垢的早期阶段。在本研究中，我们调查了分散有银或铜纳米颗粒的硅烷涂层是否能抑制冷却系统中的生物膜形成。我们开发了一个封闭的实验室生物膜反应器作为冷却管道的模型，并使用海水作为冷却水的模型。将分散有银或铜纳米颗粒的硅烷涂层（银涂层和铜涂层）试片浸泡在海水中，然后使海水在实验室生物膜反应器中循环数天以形成生物膜。表面的三维图像显示，在硅烷涂层和低浓度铜涂层上形成了海岛状结构，而在高浓度铜涂层和低浓度银涂层上未形成任何结构。通过拉曼光谱对海岛状结构进行分析，以估计生物膜的成分。我们发现，铜涂层和银涂层都是抑制冷却管道中生物膜形成的有效方法。
