Development of methods for characterizing liquids in confined space

1.纳米剪切共振装置的研制我们设计了一种新的剪切共振装置，使我们能够研究两个不透明表面之间的液体。该装置使用所谓的“Twinpath表面力装置”来构建，该装置使用“Twinpath”反射干涉测量法来进行距离测量。2.受限液晶（6CB）的排序和结构化：温度依赖性研究了6CB的结构行为（4-氰基-4 '-己基联苯）被限制在裸露的云母表面之间以及通过朗缪尔-用剪切共振法研究Bledgett单层膜。已知6CB平行于裸云母表面取向（均匀取向），并且垂直于疏水化云母表面取向（垂面取向）。对于这些不同的取向，观察到相当不同的行为。在剪切共振装置中建立了温度调节系统，发现6CB在各向同性状态下，当它们被限制在云母表面之间时，粘度也急剧增加。分析了压电陶瓷的输入电压与电容探针测量的输出电压之间的相移，得到了4 nm厚的6CB在云母表面的摩擦系数。3.纳米空间中的受限效应：溶液与染料溶液我们利用FECO光谱技术研究了6CB（液晶）-苏丹黑（染料）二元液系，该技术可以测量受限液膜的吸收。结果表明，当距离小于10 nm时，苏丹黑在云母表面之间发生凝聚。初步探讨了苏丹黑的这种缩合作用对摩擦性能的影响。

1.Development of Nano-Shear Resonance ApparatusWe have designed a new shear resonance apparatus which enable us to study liquids between two opaque surfaces. This apparatus was build using the so-called "Twinpath surface force apparatus", which uses the "Twinpath" reflective interferometry for the distance measurement.2.Ordering and Structuring of Confined Liquid Crystal (6CB) : Temperature DependenceWe studied the structuring behavior of 6CB (4-cyano-4'hexyl biphenyl) confined between bare mica surfaces as well as between hydrophobized mica surfaces by the Langmuir-Bledgett monolayer by using shear resonance method. It is known that 6CB orients parallel to the bare mica surface (homogeneous orientation) and orients perpendicular to the hydrophobized mica surface (homeotropic orientation). Quite different behavior was observed for these different orientations. We built temperature regulation system into shear resonance apparatus and found that the viscosity of 6CB in isotropic state also increased drastically when they were confined between mica surfaces. We also analyzed the phase shift between input voltage to the piezo and the output voltage measured by capacitance probe, and obtained friction coefficient of 4 nm thick 6CB confined between mica surfaces. We are also investigated the friction and viscosity at various shear velocity as well as in the different orientation of 6CB.3.Confined Effect in Nanometer Space : Solution and Dye SolutionWe investigated the 6CB (liquid crystal)-Sudan Black (dye) binary liquid system by using "FECO spectroscopy" which can measure the absorption of confined thin liquid film. It was found that Sudan Black condensed between mica surfaces when the distance decreased lower than 10 nm. The primary investigation of the effect of this condensation of Sudan Black on the frictional properties was attempted.