Ibáñez-García Gabriel O, Goldstein Patricia, Hanna S
Facultad de Ciencias, Departamento de Física, Universidad Nacional Autónoma de México, 04510, México D.F, México.
Eur Phys J E Soft Matter. 2013 May;36(5):56. doi: 10.1140/epje/i2013-13056-5. Epub 2013 May 30.
Coarse grain Brownian dynamics simulations of the bead-spring model are used to investigate the effect of attractive surfaces on the stretching of confined tethered polymers under shear flow. The weak and strong adsorbed regimes have been addressed by means of a coarse grain van der Waals potential to simulate polymer substrate interactions. Different stationary cyclic dynamics are observed upon varying shear flow intensity and surface potential strength. Polymer stretching decreases as increasing the attractive potential strength, breaking down the scaling predictions for non-adsorbed polymers. We found that adsorption is enhanced by the shear flow strength in agreement to simulations of adsorbed non-tethered polymers.
采用珠子-弹簧模型的粗粒化布朗动力学模拟，研究了在剪切流作用下，吸引性表面对受限拴系聚合物拉伸的影响。借助粗粒化范德华势来模拟聚合物与基底的相互作用，探讨了弱吸附和强吸附两种情况。改变剪切流强度和表面势强度时，会观察到不同的稳态循环动力学。随着吸引势强度的增加，聚合物拉伸程度减小，这与非吸附聚合物的标度预测不符。我们发现，与吸附的非拴系聚合物模拟结果一致，剪切流强度会增强吸附作用。
