使用原子力/摩擦力显微镜在5%-9%的相对湿度范围，研究了二氧化硅和二氧化硅基体上十八烷基三甲氧基硅烷自组装膜（简称OTEsAM/siO2）表面摩擦力和粘着力随湿度的变化规律实验表明叫OTE SAM/SiO2，不仅能明显改善二氧化硅基体表面的摩擦性能，而且在200nN（接触区HPnz压力约为0.8GPa）的载荷条件下表现出良好的抗磨性能由于强的亲水性，二氧化硅表面的摩擦力随湿度的增大先逐渐增大，然后急剧减小相反，OTE SAM/SiO2由于其良好的斥水性，表面的摩擦力在高湿度条件下略有减小，它可望成为微型机械和高速磁记录系统中较为理想的边界润滑剂。

使用原子力/摩擦力显微镜，在5%-9%相对湿度范围，研究了二氧化硅和二氧化硅基体上十八烷基三甲氧基硅烷自组装膜（简称OTEsAM/siO2）表面粘着力随湿度的变化规律。实验表明，二氧化硅表面的粘着力随湿度的增大先逐渐增大，然后急剧减小相反，叫OTE SAM/SiO2由于其良好的斥水性，表面的粘着力随湿度的增大基本不变着重从基本界面力，即表面张力、范德瓦耳斯力和基本键合力的形成与变化，分析了二氧化硅表面粘着力随湿度的增大先增后减的原因，探讨了粘着力的产生机理。

采用光干涉法相对光强原理对点接触中心区进行了润滑膜厚度测量，该方法在垂直方向的分辨率可达O.5nm，水平方向可达1μm，讨论了膜厚与压力，速度和润滑油粘度之刘的关系，观察和分析了流体润滑膜的失效现象。实验结果表明如果接触压力足够小或者润滑油粘度足够高，即使在一个很低的速度下也能清晰地观察到流体动压润滑效应。当压力增至某一定值，在膜厚-速度曲线上可观察到一个转辑点，当速度降到此点以下时，润滑膜厚度将很快减小到几个分子层厚，此时，润滑膜不再具有流体润滑特征，即流体润滑膜失效，失效点会出现在不同的速度和压力下。要使接触区在较高的压力下形成流体膜就必须加更高的速度或使用更大粘魔的润滑油。最后建立了失效点的压力、速度和润滑油粘度之间的关系。

For the friction measurements with AFM/FFM, usually the relative values of friction signal can be obtained. In order to compare the micro-tribological properties of different samples, mica is often used as an reference sample for friction measurement. However, due to the friction force of new cleaved mica surface is unstable, it is urged to systematically investigate the tribological properties of mica to design the experimental rules of the reference sample mica for friction measurements. Experimental results show that the friction of mica varies with the cleaving time, humidity and surface state of tip. The friction measured with different tips on mica varies in the range of

Pure organic molecules exhibiting a suitable concave rigid shape are expected to give porous glasses in the solid state. Such a feature opens new opportunities to avoid crystallization and to improve molecular solubility in relation to the high internal energy of these solid phases. To quantitatively explore the latter strategy, a series of rigid tetrahedral conjugated molecules nC and the corresponding models nR have been synthesized. Related to the present purpose, several properties have been investigated using UV absorption, steady-state fluorescence emission, differential scanning calorimetry, 1H NMR translational self-diffusion, magic angle spinning 13C NMR, and multiple-beam interferometry experiments. The present tetrahedral crosses are up to 8 orders of magnitude more soluble than the corresponding model compounds after normalization to the same molecular length. In addition, they give concentrated monomeric solutions that can be used to cover surfaces with homogeneous films whose thickness goes down to the nanometer range. Such attractive features make cross-like molecular architectures promising for many applications.