Dipartimento di Chimica e Chimica Industriale, Università di Pisa , Pisa 56124, Italy.
School of Biosciences, The University of Birmingham , Edgbaston, Birmingham B15 5TT, U.K.
ACS Appl Mater Interfaces. 2017 May 17;9(19):16505-16516. doi: 10.1021/acsami.7b03168. Epub 2017 May 2.
A set of controlled surface composition films was produced utilizing amphiphilic block copolymers dispersed in a cross-linked poly(dimethylsiloxane) network. These block copolymers contained oligo(ethylene glycol) (PEGMA) and fluoroalkyl (AF6) side chains in selected ratios and molecular weights to control surface chemistry including antifouling and fouling-release performance. Such properties were assessed by carrying out assays using two algae, the green macroalga Ulva linza (favors attachment to polar surfaces) and the unicellular diatom Navicula incerta (favors attachment to nonpolar surfaces). All films performed well against U. linza and exhibited high removal of attached sporelings (young plants) under an applied shear stress, with the lower molecular weight block copolymers being the best performing in the set. The composition ratios from 50:50 to 60:40 of the AF6/PEGMA side groups were shown to be more effective, with several films exhibiting spontaneous removal of the sporelings. The cells of N. incerta were also removed from several coating compositions. All films were characterized by surface techniques including captive bubble contact angle, atomic force microscopy, and near edge X-ray absorption fine structure spectroscopy to correlate surface chemistry and morphology with biological performance.
利用两亲嵌段共聚物在交联聚二甲基硅氧烷网络中的分散作用，制备了一组可控表面组成的薄膜。这些嵌段共聚物包含聚乙二醇甲基丙烯酸酯（PEGMA）和氟烷基（AF6）侧链，其比例和分子量经过选择，以控制表面化学性质，包括抗污和防污性能。通过对两种藻类——绿色大型海藻石莼（倾向于附着在极性表面上）和单细胞硅藻新月菱形藻（倾向于附着在非极性表面上）进行实验，评估了这些性质。所有薄膜在对抗 U. linza 方面表现良好，并在施加剪切应力下表现出对附着的孢子体（幼体）的高去除率，在该组中，分子量较低的嵌段共聚物表现最佳。AF6/PEGMA 侧基的比例为 50:50 至 60:40 被证明更有效，其中几种薄膜表现出孢子体的自发去除。几种涂层组合物也能去除 N. incerta 的细胞。所有薄膜都通过表面技术进行了表征，包括俘泡接触角、原子力显微镜和近边 X 射线吸收精细结构光谱，以将表面化学和形态与生物性能相关联。
