两性离子自组装仿生表面的制备、 表征及抗黏附性能

设计与合成了磺酸甜菜碱型的两性离子化合物: N,N-二甲基氨甲酸乙酯基丙基三乙氧基硅烷磺酸内盐(SiNNS), 利用红外光谱(FTIR)和氢核磁共振波谱(¹H NMR)对其分子组成与结构进行了表征. 通过自组装技术将SiNNS分子构筑在玻璃基材表面, 形成了模拟细胞外层膜的仿生表面. 利用原子力显微镜(AFM)、 X光电子能谱(XPS)和接触角测量仪对表面的形貌特征、 化学组成和润湿性进行了表征. 以空白玻璃为对照样品, 研究了这一表面的防雾性能和抗细菌黏附性能. 结果表明, 所制备的两性离子自组装仿生表面具有超亲水性和水下超疏油特性, 其水滴接触角为9.2°, 水下油滴接触角接近180°; 与对照样品相比, 两性离子自组装表面具有优异的防雾性与抗细菌黏附性.

Preparation,Characterization and Antibacterial Adhesion Performance of the Biomimetic Surfaces via Zwitterionic Self-assembly†

A sulfobetaine zwitterionic compound, N,N-dimethylamino ethyl carbamate propyl triethoxysilane sulfonate(SiNNS), was designed and synthesized and its composition and molecular structure were characterized by means of FTIR and ¹H NMR spectroscopy. Furthermore, the biomimetic surface imitating the chemical features of cellular outer membrane were constructed via the self-assembly of SiNNS molecules on the hydroxylated glass surface. The morphology structure, chemical composition and wettability of the prepared biomimetic surface were characterized by atomic force microscopy(AFM), X-ray photoelectron spectroscopy(XPS) and contact angle measurement. The antifogging and antibacterial adhesion performances of the biomimetic surface were investigated using an untreated glass surface as a control sample. The results indicate that the zwitterionic self-assembled biomimetic surface can possess superhydrophilicity with a water contact angle of 9.2° and underwater superoleophobicity with an oil contact angle of 175.6°. Compared to the corresponding control sample, the zwitterionic self-assembled biomimetic surface can exhibit an excellent antifogging property and an obvious antibacterial adhesion performance.