论文部分内容阅读
用扫描隧道显微镜 (STM)研究了室温下十八醇 ( 1 C1 8H37OH)和十四烷 (C1 4H30 )在石墨表面的吸附行为 .十八醇在石墨表面自组装形成条状结构 .实验发现了十八醇分子在石墨表面的两种不同的密排方式 ,它们形成并列的不同宽度的条状结构 .还发现 ,由于溶剂 (正十四烷C1 4H30 )的完全蒸发 ,留下的十八醇分子在石墨表面吸附的自组装结构与固液界面中十八醇分子在石墨表面的吸附形成的结构在分子方向、表面分子晶体的晶格常数及条状结构宽度等方面有很大的不同 .此外 ,实验中也发现溶剂十四烷在某种情况下也能在石墨表面吸附形成可供STM观察的有较长时间稳定性的条状周期结构 .实验观察到的十四烷在石墨表面形成的晶体结构与固液界面中观察到的有序结构的晶体结构常数和分子排列方向也是不同的 .根据STM图像 ,提出了十八醇和十四烷在石墨表面吸附的结构模型
The adsorption behavior of stearyl alcohol (1 C1 8H37OH) and tetradecane (C1 4H30) on the surface of graphite was investigated by scanning tunneling microscope (STM) .Stearyl alcohol was self-assembled into a stripe structure on graphite surface. Octadecyl alcohol molecules in the graphite surface of the two different close-packed way, they form juxtaposed different width of the strip structure was also found that due to the solvent (n-tetradecane C1 4H30) is completely evaporated, leaving octadecanol The self-assembly structure of molecules adsorbed on graphite surface and the adsorption structure of octadecanol molecules on graphite surface in solid-liquid interface are very different in molecular orientation, lattice constant of surface molecular crystal and width of stripe structure. In addition, tetradecane was also found to be able to adsorb on the graphite surface in some cases to form a long-lasting stripe-like periodic structure which can be observed by STM.The experimentally observed tetradecane formed on the graphite surface Is different from that of the ordered structure observed in the solid-liquid interface.According to the STM images, the adsorption of octadecanol and tetradecane onto the graphite surface is proposed Constitutive model