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首页> 美国卫生研究院文献>Scientific Reports >Non-linear non-monotonic effect of nano-scale roughness on particle deposition in absence of an energy barrier: Experiments and modeling
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Non-linear non-monotonic effect of nano-scale roughness on particle deposition in absence of an energy barrier: Experiments and modeling

机译：在没有能垒的情况下纳米尺度粗糙度对颗粒沉积的非线性非单调影响：实验和建模

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摘要

Deposition of colloidal- and nano-scale particles on surfaces is critical to numerous natural and engineered environmental, health, and industrial applications ranging from drinking water treatment to semi-conductor manufacturing. Nano-scale surface roughness-induced hydrodynamic impacts on particle deposition were evaluated in the absence of an energy barrier to deposition in a parallel plate system. A non-linear, non-monotonic relationship between deposition surface roughness and particle deposition flux was observed and a critical roughness size associated with minimum deposition flux or “sag effect” was identified. This effect was more significant for nanoparticles (<1 μm) than for colloids and was numerically simulated using a Convective-Diffusion model and experimentally validated. Inclusion of flow field and hydrodynamic retardation effects explained particle deposition profiles better than when only the Derjaguin-Landau-Verwey-Overbeek (DLVO) force was considered. This work provides 1) a first comprehensive framework for describing the hydrodynamic impacts of nano-scale surface roughness on particle deposition by unifying hydrodynamic forces (using the most current approaches for describing flow field profiles and hydrodynamic retardation effects) with appropriately modified expressions for DLVO interaction energies, and gravity forces in one model and 2) a foundation for further describing the impacts of more complicated scales of deposition surface roughness on particle deposition.
机译：胶体和纳米级颗粒的表面沉积对于从饮用水处理到半导体制造等众多自然和工程化的环境，健康和工业应用都是至关重要的。在不存在平行板系统中沉积能量垒的情况下，评估了纳米级表面粗糙度诱导的流体动力学对颗粒沉积的影响。观察到沉积表面粗糙度与颗粒沉积通量之间的非线性，非单调关系，并确定了与最小沉积通量或“下陷效应”相关的临界粗糙度大小。对于纳米颗粒（<1μm），此效应比对胶体更显着，并使用对流扩散模型进行了数值模拟并进行了实验验证。与仅考虑Derjaguin-Landau-Verwey-Overbeek（DLVO）力时相比，包含流场和流体动力滞后效应可以更好地说明颗粒沉积特征。这项工作提供了1）第一个综合框架，该框架通过统一水动力（使用最新的描述流场轮廓和水动力滞后效应的方法）和适当修改的DLVO相互作用表达式来描述纳米级表面粗糙度对颗粒沉积的水动力影响。一个模型中的能量，重力和重力2）一个基础，用于进一步描述更复杂尺度的沉积表面粗糙度对粒子沉积的影响。

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