Zahorán Réka, Kumar Pawan, Horváth Dezső, Tóth Ágota
Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1., Szeged, H-6720, Hungary.
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1., Szeged, H-6720, Hungary.
Soft Matter. 2023 Oct 25;19(41):8033-8039. doi: 10.1039/d3sm01026k.
A droplet of sodium alginate dripped into calcium chloride solution results in plate or boat shaped hydrogels. Both exhibit several minute-long self-propelled motion on the liquid surface without any extra fuel added, offering a new method to making active materials. By changing the initial concentrations, we are able to tune the transient dynamic activities from translational to rotational or stop-and-run motion. Dynamics are governed by osmotic pressure induced Marangoni effect, depending on the density difference and initial concentrations.
将一滴海藻酸钠滴入氯化钙溶液中会形成片状或船状水凝胶。两者在不添加任何额外燃料的情况下，都能在液体表面进行长达几分钟的自推进运动，为制备活性材料提供了一种新方法。通过改变初始浓度，我们能够将瞬态动态活动从平移运动调节为旋转运动或启停运动。动力学受渗透压诱导的马兰戈尼效应支配，这取决于密度差和初始浓度。
