Liley M, Gourdon D, Stamou D, Meseth U, Fischer TM, Lautz C, Stahlberg H, Vogel H, Burnham NA, Duschl C
M. Liley, D. Stamou, U. Meseth, H. Vogel, C. Duschl, Department of Chemistry, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland. D. Gourdon and N. A. Burnham, Department of Physics, Swiss Federal Institute of Technology, CH-1015.
Science. 1998 Apr 10;280(5361):273-5. doi: 10.1126/science.280.5361.273.
Lateral force microscopy in the wearless regime was used to study the friction behavior of a lipid monolayer on mica. In the monolayer, condensed domains with long-range orientational order of the lipid molecules were present. The domains revealed unexpectedly strong friction anisotropies and non-negligible friction asymmetries. The angular dependency of these effects correlated well with the tilt direction of the alkyl chains of the monolayer, as determined by electron diffraction and Brewster angle microscopy. The molecular tilt causing these frictional effects was less than 15 degrees, demonstrating that even small molecular tilts can make a major contribution to friction.
在无磨损状态下，采用横向力显微镜研究了云母上脂质单层的摩擦行为。在该单层中，存在着脂质分子具有长程取向有序的凝聚域。这些域显示出出乎意料的强摩擦各向异性和不可忽略的摩擦不对称性。这些效应的角度依赖性与通过电子衍射和布鲁斯特角显微镜测定的单层烷基链的倾斜方向密切相关。导致这些摩擦效应的分子倾斜小于15度，这表明即使是小的分子倾斜也能对摩擦产生重大影响。
