生物兼容蛋白水凝胶微图案的光刻平版印刷

通过简易的紫外光刻平版印刷技术,对无化学修饰的生物兼容性良好的天然牛白蛋白的水相光刻胶进行微图案化加工,获得了可用作微光栅器件的蛋白质微条纹结构,表征了蛋白质凝胶微条纹图案的宏观性状.结果表明,其折射散射彩虹色明显,单束激光经过后的衍射条纹对称度高,可获得11级衍射条纹.通过改变参数实现了条纹的可控褶皱.将图案化的蛋白水凝胶膜用于肝癌细胞的培养,实现了细胞图案化排布.     

Superconductivity of bilayer titanium/indium thin film grown on SiO_2/Si(001)

Bilayer superconducting films with tunable transition temperature(Tc) are a critical ingredient to the fabrication of high-performance transition edge sensors. Commonly chosen materials include Mo/Au, Mo/Cu, Ti/Au, and Ti/Al systems. Here in this work, titanium/indium(Ti/In) bilayer superconducting films are successfully fabricated on SiO_2/Si(001)substrates by molecular beam epitaxy(MBE). The success in the epitaxial growth of indium on titanium is achieved by lowering the substrate temperature to-150?C during indium evaporation. We measure the critical temperature under a bias current of 10 μA, and obtain different superconducting transition temperatures ranging from 645 m K to 2.7 K by adjusting the thickness ratio of Ti/In. Our results demonstrate that the transition temperature decreases as the thickness ratio of Ti/In increases.     

紫外固化型聚合物水凝胶的周期图案形成及其调控

以聚乙二醇二丙烯酸酯型水凝胶（PEGDA）为基底,制备了长程有序的表面褶皱图形,研究了其形成机理以及调控方法。通过调控光交联加工参数,聚合物凝胶表面出现大面积的周期图形阵列,该阵列尺寸可以在101～103μm之间调控,整体图形面积可达mm至cm级。分析表明,褶皱图形的形成主要是由于水汽蒸发过程中PEGDA水凝胶膜表面弯曲与体积压缩之间的竞争作用。