Tian Limei, Jin E, Wang Jianfu, Wang Xiaoming, Bing Wei, Jin Huichao, Zhao Jie, Ren Luquan
Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University No. 5988 Renmin Street Changchun 130022 China
Advanced Institute of Materials Science, Changchun University of Technology Changchun 130012 P. R. China
RSC Adv. 2019 Dec 10;9(70):40855-40862. doi: 10.1039/c9ra06761b. eCollection 2019 Dec 9.
The influence of elastic deformation and elastic modulus on the release of adhered bacteria was investigated in this paper. Four silicone elastomers (SE) with different elastic moduli and one rigid polystyrene sheet were prepared to verify the antifouling effect of elastic deformation. The SE film has an elastic deformation effect under the stimulus of fluid medium, which makes the surface unstable. That could reduce the adhesion of fouling organisms and provide a foul-release basis. Distinct anti-adhesion properties were observed in our study in that cells more easily adhered to the rigid surface than the elastic surfaces under hydrodynamic conditions. However, the bacterial attachment test showed a similar antifouling performance of SE and the rigid surface under static conditions. To investigate the anti-adhesion ability of the elastic surface and rigid surface, the bacterial adhesive kinetics were studied by Discrete Element Method (DEM)-Computational Fluid Dynamics (CFD) coupling simulation. Results indicated the number of bacteria adhering on the elastic wall was significantly lower than on the rigid wall. And as the elastic modulus increased, the bacterial adhesion increased accordingly within a certain range. This work should not only enhance understanding of elastomer-based antifouling materials, but also facilitate the design and construction of other types non-toxic foul-release materials.
本文研究了弹性变形和弹性模量对附着细菌释放的影响。制备了四种具有不同弹性模量的硅橡胶弹性体（SE）和一块刚性聚苯乙烯片材，以验证弹性变形的防污效果。SE膜在流体介质的刺激下具有弹性变形效应，这使得表面不稳定。这可以减少污损生物的附着，并提供一个防污释放的基础。在我们的研究中观察到明显的抗粘附特性，即在流体动力学条件下，细胞更容易附着在刚性表面而不是弹性表面上。然而，细菌附着试验表明，在静态条件下，SE和刚性表面具有相似的防污性能。为了研究弹性表面和刚性表面的抗粘附能力，采用离散元法（DEM）-计算流体动力学（CFD）耦合模拟研究了细菌粘附动力学。结果表明，附着在弹性壁上的细菌数量明显低于刚性壁上的细菌数量。并且随着弹性模量的增加，在一定范围内细菌粘附量相应增加。这项工作不仅应增进对基于弹性体的防污材料的理解，还应促进其他类型无毒防污释放材料的设计和构建。
