Nhan D T, Pollack G H
Department of Bioengineering, University of Washington, Seattle, WA 98195, USA.
Int J Des Nat Ecodyn. 2011 Jun 2;6(2):139-144. doi: 10.2495/dne-v6-n2-139-144.
Particles and solutes are excluded from the vicinity of hydrophilic surfaces, leaving large microsphere-free regions known as exclusion zones (EZs). Prior work had indicated that EZs could extend to distances of up to several hundred micrometers from the nucleating surface. These observations were made on large, extended surfaces, leaving open the question whether EZ size might depend on the characteristic dimension of the excluding surface. We placed one or few ion-exchange-resin beads whose diameters varied from 15 μm to 300 μm in cuvettes. The beads were suffused with aqueous microsphere suspensions for observing the surfaces' exclusionary behavior. Results showed a direct relation between bead size and EZ size over the full range of bead diameter, implying a similar relation for smaller particles or molecules, perhaps extending beyond the resolution of the light microscope.
颗粒和溶质被排除在亲水性表面附近，形成了称为排斥区（EZs）的无大微球区域。先前的研究表明，排斥区可以从成核表面延伸到数百微米的距离。这些观察是在大的、延伸的表面上进行的，因此排斥区大小是否可能取决于排斥表面的特征尺寸这一问题仍未解决。我们将直径从15μm到300μm不等的一个或几个离子交换树脂珠放入比色皿中。珠子中充满了水性微球悬浮液，以观察表面的排斥行为。结果表明，在整个珠子直径范围内，珠子大小与排斥区大小之间存在直接关系，这意味着对于更小的颗粒或分子可能也有类似关系，甚至可能超出光学显微镜的分辨率。
