Holographic characterization of contaminants in water: Differentiation of suspended particles in heterogeneous dispersions
Holographic characterization of contaminants in water: Differentiation of suspended particles in heterogeneous dispersions
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DOI：
10.1016/j.watres.2017.06.006
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发表时间：
2017-10-01
期刊：
影响因子：
12.8
通讯作者：
Grier, David G.
中科院分区：
文献类型：
--
作者：
Philips, Laura A.;Ruffner, David B.;Grier, David G.
在非均质多组分样品中，确定悬浮在水中的颗粒的大小分布和组成具有挑战性。光散射技术可以测量颗粒大小的分布，但不能为区分不同类型的颗粒提供依据。直接成像技术可以根据形状对颗粒进行分类，但对其组成却知之甚少。全息表征通过直接测量悬浮液中单个粒子的尺寸、折射率和三维位置来满足这一需求。测量单个胶体粒子的折射率的能力是全息表征的独特能力。此外，全息表征足够快，可以实时建立种群分布数据，并跟踪不同分散粒子种群浓度的时间变化。我们使用一个由聚苯乙烯微珠与细菌共分散在水包油乳液中的模型系统来证明这些能力。我们还演示了不同污染物的全息指纹如何有助于识别其来源。(C) 2017年作者。Elsevier Ltd.出版。这是一篇基于CC BY许可（http://creativecommons.org/licenses/by/4.0/）的开放获取文章。
Determining the size distribution and composition of particles suspended in water can be challenging in heterogeneous multicomponent samples. Light scattering techniques can measure the distribution of particle sizes, but provide no basis for distinguishing different types of particles. Direct imaging techniques can categorize particles by shape, but offer few insights into their composition. Holographic characterization meets this need by directly measuring the size, refractive index, and three-dimensional position of individual particles in a suspension. The ability to measure an individual colloidal particle's refractive index is a unique capability of holographic characterization. Holographic characterization is fast enough, moreover, to build up population distribution data in real time, and to track time variations in the concentrations of different dispersed populations of particles. We demonstrate these capabilities using a model system consisting of polystyrene microbeads co-dispersed with bacteria in an oil-in-water emulsion. We also demonstrate how the holographic fingerprint of different contaminants can contribute to identifying their source. (C) 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).