Shear-affected depletion interaction
Shear-affected depletion interaction
复制标题
剪切影响的耗尽相互作用
DOI：
10.1140/epje/i2012-12060-7
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Peter R. Lang
中科院分区：
文献类型：
--
作者：
C. July;D. Kleshchanok;Peter R. Lang
我们研究了流场对圆盘状耗尽剂引起的耗尽相互作用强度的影响。在圆盘的低质量浓度下，可以通过增加所施加的剪切速率来连续地减小耗尽电位的深度，直到耗尽力在实验上不可感知。在血小板质量浓度的阈值以上，在可接近的剪切速率范围内，耗竭电位不再受流动的影响。虽然在低浓度下观察到的耗尽强度的降低可能归因于圆盘的流动对齐，但尚不清楚为什么流动的影响在高浓度下消失。为了观察这些影响，修改已建立的全内反射显微镜（TIRM）技术的实施。我们显示这些修改的适用性，以测量颗粒壁的相互作用潜力的非平衡条件下的系统，颗粒暴露于剪切。
We investigate the influence of flow fields on the strength of the depletion interaction caused by disc-shaped depletants. At low mass concentration of discs, it is possible to continuously decrease the depth of the depletion potential by increasing the applied shear rate until the depletion force is not perceivable experimentally. Above a threshold in the platelet mass concentration, the depletion potential can no longer be affected by flow in the accessible range of shear rates. While the observed decrease of depletion strength at low depletant concentration may be ascribed to flow alignment of the discs, it is not clear why the influence of flow is vanishing at high concentrations. In order to observe these effects, a modification of the established total internal reflexion microscopy (TIRM) technique is be implemented. We show the suitability of these modifications to measure particle-wall interaction potentials under non-equilibrium conditions for systems where particles are exposed to a shear.