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首页> 外文期刊>Environmental Science & Technology >Aqueous Aggregation and Surface Deposition Processes of Engineered Superparamagnetic Iron Oxide Nanoparticles for Environmental Applications
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Aqueous Aggregation and Surface Deposition Processes of Engineered Superparamagnetic Iron Oxide Nanoparticles for Environmental Applications

机译：工程超顺磁性氧化铁纳米粒子在环境中的水聚集和表面沉积过程

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摘要

Engineered, superparamagnetic, iron oxide nanoparticles (IONPs) have significant potential as platform materials for environmental sensing, imaging and remediation due to their unique size, physicochemical and magnetic properties. To this end, controlling the size and surface chemistry of the materials is crucial for such applications in the aqueous phase, and in particular, for porous matrixes with particle-surface interaction considerations. In this study, superparamagnetic, highly monodispersed 8 run IONPs were synthesized and transferred into water as stable suspensions (remaining monodispersed) by way of an interfacial oleic acid bilayer surface. Once stabilized and characterized, particle-partide and model surface interactions (deposition and release) were quantitatively investigated and described systematically as a function of ionic strength (IS) and type with time-resolved dynamic light scattering (DLS), zeta potential, and real-time quartz crystal microbalance with dissipation monitoring (QCM-D) measurements. The critical coagulation concentration (CCC) for oleic acid bilayer coated iron oxide nanoparticles (OA-IONPs) were determined to be 710 mM for NaCl (matching DLVO predictions) and 10.6 mM for CaCl_2, respectively. For all conditions tested, surface deposition kinetics showed stronger, more favorable interactions between OA-IONPs and polystyrene surfaces compared to silica, which is hypothesized to be due to increased particle-surface hydrophobic interactions (when compared to silica surfaces).
机译：经过工程改造的超顺磁性氧化铁纳米颗粒（IONPs）具有独特的尺寸，理化和磁性特性，具有作为环境传感，成像和修复平台材料的巨大潜力。为此，控制材料的尺寸和表面化学性质对于在水相中的这种应用是至关重要的，特别是对于考虑到颗粒-表面相互作用的多孔基质而言。在这项研究中，合成了超顺磁性，高度单分散的8种IONP，并通过界面油酸双层表面以稳定的悬浮液（保持单分散）的形式转移到水中。一旦稳定并进行了表征，就可以定量研究和研究颗粒-粒子和模型表面的相互作用（沉积和释放），并将其描述为离子强度（IS）和类型的函数，以及时间分辨动态光散射（DLS），ζ电位和实数。耗时监控（QCM-D）测量的实时石英微天平。确定油酸双层涂覆的氧化铁纳米颗粒（OA-IONPs）的临界凝结浓度（CCC）对于NaCl为710 mM（与DLVO预测相符），对于CaCl_2为10.6 mM。在所有测试条件下，与二氧化硅相比，表面沉积动力学显示OA-IONP与聚苯乙烯表面之间的相互作用更强，更有利，这被认为是由于颗粒表面疏水相互作用的增加（与二氧化硅表面相比）。

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  • 来源
    《Environmental Science & Technology》 |2014年第20期|11892-11900|共9页
  • 作者

    Wenlu Li; Di Liu; Jiewei Wu; Changwoo Kim; John D. Fortner;

  • 作者单位

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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