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The shape and dynamics of deformations of viscoelastic fluids by water droplets.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-07-07 , DOI: 10.1016/j.jcis.2020.07.007
Dongjin Seo 1 , Szu-Ying Chen 2 , Dong Woog Lee 3 , Alex M Schrader 2 , Kollbe Ahn 4 , Steve Page 5 , Peter H Koenig 5 , Yonas Gizaw 6 , Jacob N Israelachvili 7
Affiliation  

Many studies on the deformation of soft films by liquids confirmed the increase in the radius of the deformation and the decrease in the apparent contact angle. However, due to the thinness, the dynamics of the deformation could not be observed until the thermodynamic equilibrium. Thus, the dynamics on thick soft materials was studied until equilibrium to contrast the effect of different interfacial energy between different soft materials and water. Therefore, we prepared two different polymeric fluids with similar rheology by cross-linking monomers, yet with different contact angles with water. Sometime after water droplets were placed on these thick polymers, 3D profiles of the deformation were recorded. Though the effect of the surface tension was not verified, the same trend in the dynamics was observed as with thin films, except for the decrease in the radius after the initial increase. The three-phase boundaries (TPBs) were found not at the apex of the ridges formed during the transition to equilibrium. By calculating the surface tensions and angles of each interface at the equilibrium, we found that the temporary imbalance among surface tensions induced the slip of the TPBs toward the center of water droplets, thus dislocating the TPBs and decreasing the radius.



中文翻译:

水滴引起的粘弹性流体变形的形状和动力学。

关于液体对软膜的变形的许多研究证实,变形半径增大并且表观接触角减小。但是,由于薄,直到热力学平衡才观察到变形的动力学。因此,动力学上的研究软质材料直到达到平衡,以对比不同软质材料和水之间不同界面能的影响。因此,我们通过交联单体制备了两种具有相似流变性的不同聚合物流体,但它们与水的接触角不同。将水滴放置在这些厚聚合物上的某个时间后,记录了变形的3D轮廓。尽管没有验证表面张力的影响,但观察到与薄膜相同的动力学趋势,只是初始增加后半径减小了。三相边界(TPB)不在过渡到平衡过程中形成的脊的顶点处。通过计算平衡时每个界面的表面张力和角度,

更新日期:2020-07-24
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