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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Entropy-Driven Aggregation of Titanium Dioxide Nanoparticles in Aquatic Environments
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Entropy-Driven Aggregation of Titanium Dioxide Nanoparticles in Aquatic Environments

机译：水产环境中二氧化钛纳米粒子的熵驱动的聚集

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摘要

The aggregation process of engineered nanoparticles (ENPs) is important in assessing their fate and transport in the environment. Here, we present the application of isothermal titration calorimetry (ITC) in studying the thermodynamics of ENPs' aggregation in aqueous solutions containing monovalent (NaCl) and divalent (CaCl2) electrolytes, natural organic matter, and hematite natural NPs, which enables us to elucidate their interaction mechanism. The free energies for the aggregation of TiO2 at different solution conditions were dominated by large favorable entropy, presumably because of the expulsion of bound water molecules to the solution upon complexation. The copresence of humic acid and Ca2+ facilitated aggregation for both homo- and heterosystems through intra- or intermolecular bridging, leading to the formation of more compact aggregates. We believe that this ITC strategy can be successfully used to characterize the interaction details between ENPs and various environmental components in ambient water systems.
机译：工程纳米粒子（ENP）的聚集过程对于评估其在环境中的命运和运输方面是重要的。在这里，我们介绍了等温滴定热量法（ITC）在研究含有一价（NaCl）和二价（CaCl2）电解质，天然有机物和赤铁矿天然NPS的水溶液中的enps聚集的热力学，这使我们能够阐明他们的互动机制。在不同的溶液条件下TiO2聚集的自由能量是由大的有利熵的主导，可能是因为在络合后将结合的水分子驱逐到溶液中。腐殖酸和Ca2 +通过内分子间桥接的均匀和异质体系的促进聚集，导致形成更紧凑的聚集体。我们认为，这种ITC策略可以成功地用于在环境水系统中表征ENP和各种环境部件之间的相互作用细节。

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