Sinz David K N, Hanyak Myroslava, Darhuber Anton A
Mesoscopic Transport Phenomena Group, Department of Applied Physics, Eindhoven University of Technology, Postbus 513, 5600MB Eindhoven, The Netherlands.
J Phys Chem Lett. 2013 Mar 21;4(6):1039-43. doi: 10.1021/jz400287x. Epub 2013 Mar 15.
While the Marangoni-stress-driven spreading of surfactants along continuous fluid interfaces is a well-studied problem, we demonstrate experimentally that swift and efficient surfactant transport can also occur along discontinuous interfaces. We used chemical surface patterning to create arrays of discrete drops and liquid bridges immersed inside a second immiscible liquid. Surface-active compounds introduced at one end of the linear array are transported along the array via surfactant-induced interfacial convection at a rate by far exceeding diffusion. We believe this mechanism to be relevant to the application of surfactants in enhanced oil recovery, where oil-water interfaces are likely to be discontinuous. Marangoni flows can provide access to dead-end pores and low-permeability regions that are otherwise bypassed by conventional pressure-driven waterfloods.
虽然表面活性剂在连续流体界面上由马兰戈尼应力驱动的铺展是一个已得到充分研究的问题，但我们通过实验证明，表面活性剂也能沿着不连续界面快速高效地传输。我们利用化学表面图案化技术，在第二种不混溶液体中创建了离散液滴和液桥的阵列。在线性阵列一端引入的表面活性化合物，通过表面活性剂诱导的界面对流沿着阵列传输，其速率远远超过扩散速率。我们认为这种机制与表面活性剂在强化采油中的应用相关，在强化采油中油水界面很可能是不连续的。马兰戈尼流可以进入常规压力驱动水驱否则会绕过的死端孔隙和低渗透区域。
