Hampton Marc A, Donose Bogdan C, Taran Elena, Nguyen Anh V
Division of Chemical Engineering, School of Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
J Colloid Interface Sci. 2009 Jan 1;329(1):202-7. doi: 10.1016/j.jcis.2008.09.040. Epub 2008 Oct 18.
The interaction between hydrophobic surfaces in aqueous solutions is particularly important because it is encountered in many industrial processes. Even though advances in surface science have been tremendous, the nature of the hydrophobic interaction remains one of the greatest challenges to the field. In this work an atomic force microscope (AFM) was used to measure the normal and lateral interactions between a silica bead and a smooth silica substrate hydrophobized by esterification with 1-octanol. The experiments were performed in water and in water after alcohol-water exchange, a method that has been shown to increase the occurrence and size of nanobubbles at the hydrophobic surface and in turn result in a longer range hydrophobic force due to capillary bridge formation. It was found that the alcohol-water exchange had a significant impact on the friction force due to the increased size of the capillary, which increased adhesion.
水溶液中疏水表面之间的相互作用尤为重要，因为在许多工业过程中都会遇到这种情况。尽管表面科学取得了巨大进展，但疏水相互作用的本质仍然是该领域面临的最大挑战之一。在这项工作中，使用原子力显微镜（AFM）测量了二氧化硅珠与通过用1-辛醇酯化而疏水化的光滑二氧化硅基底之间的法向和横向相互作用。实验在水中以及在醇-水交换后的水中进行，醇-水交换是一种已被证明能增加疏水表面纳米气泡的出现率和尺寸，进而由于毛细管桥的形成导致更长程疏水作用力的方法。研究发现，由于毛细管尺寸增大，醇-水交换对摩擦力有显著影响，从而增加了附着力。
