DEVELOPMENT OF MOLECULAR ACTUATOR BASED ON CONFORMATIONAL TRANSFORMATION

近年来，基于探针微球的分子组装技术的发展已进入大规模阶段。在本项目中，我们试图通过外加电场来定向聚甲醛分子链中的单轴偶极矩，以开发一种新型的致动器(分子活塞)。通过改变分散液浓度、表面压力、压缩速度和亚相温度制备了单分子膜。将单分子膜转移到云母上，用原子力显微镜观察其形貌。在压缩速度为0.8 mm/S，表面压力为20mN/m，亚相温度为293K的条件下，用浓度为103M的溶液制备了形态均一的聚甲醛单层，并在较强的作用力下进行扫描，得到了孤立的聚甲醛单链。通过在悬臂梁和衬底之间施加电场来研究聚甲醛链条的伸缩行为。

Recently, development of molecular mashine, acting in a scale of molecular assembly, have started based on usage of probe microsocpy. In this project, we tried to orient uniaxially dipole moments in a polyoxymethylene chain by applying electric field in order to develop a novel actuator (molecular piston).A benzene solution of polyoxymethylene was spread on water surface to prepare the polyoxymethylene monolayr. The monolayr was prepared by changing the concentration of spread solution, the surface pressure, the compression speed and the subphase temperature. The monolayr was transfeercl onto mica substrate to observe the morphology by an atomic force microscope. The morphologically homogeneous polyoxymethylene monolayr was prepared by the compression speed of 0.8 mm/s the surface pressure of 20 mN/m and at the subphase temperature of 293 K by using the solution with the concentration of 10^3 M.An isolated polyoxymethylene chain was obtained by scanning at stronger applied force. The expansion and contraction behaviors of polyoxymethylene chain will be investigated by applying electric field between cantilever and the substrate.