Chain formation and aging process in biocompatible polydisperse ferrofluids: Experimental investigation and Monte Carlo simulations
Chain formation and aging process in biocompatible polydisperse ferrofluids: Experimental investigation and Monte Carlo simulations
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DOI：
10.1016/j.cis.2012.12.003
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发表时间：
2013-05-01
影响因子：
15.6
通讯作者：
Miotto, Ronei
中科院分区：
文献类型：
--
作者：
Bakuzis, Andris Figueiroa;Branquinho, Luis Cesar;Miotto, Ronei
我们回顾使用蒙特卡罗模拟的描述中的磁性纳米粒子分散在液体载体。我们的主要重点是使用理论和模拟作为工具的描述的性质的铁磁流体。特别是，我们报告的多分散性和短程相互作用的纳米粒子的自组织的影响。这种贡献被证明是非常重要的系统，其特征在于颗粒直径小于10 nm。提出了一种新的生物相容性磁性胶体的三维多分散蒙特卡罗方法。作为一个例子，分散在NaCl溶液中的离子表面的铁磁流体的理论和模拟结果直接比较实验数据（透射电子显微镜- TEM，磁transmittance，和电子磁共振- EMR）。我们结合的理论和实验结果表明，在老化过程中可能会观察到两种可能的机制：纳米粒子的接枝减少，由于聚集体的形成和Hamaker常数增加，由于氧化。此外，我们还简要讨论了理论团聚形成模型，并将它们与实验数据进行了比较。(C)2013爱思唯尔有限公司版权所有。
We review the use of Monte Carlo simulations in the description of magnetic nanoparticles dispersed in a liquid carrier. Our main focus is the use of theory and simulation as tools for the description of the properties of ferrofluids. In particular, we report on the influence of polydispersity and short-range interaction on the self-organization of nanoparticles. Such contributions are shown to be extremely important for systems characterized by particles with diameters smaller than 10 nm. A new 3D polydisperse Monte Carlo implementation for biocompatible magnetic colloids is proposed. As an example, theoretical and simulation results for an ionic-surfacted ferrofluid dispersed in a NaCl solution are directly compared to experimental data (transmission electron microscopy - TEM, magneto-transmissivity, and electron magnetic resonance - EMR). Our combined theoretical and experimental results suggest that during the aging process two possible mechanisms are likely to be observed: the nanoparticle's grafting decreases due to aggregate formation and the Hamaker constant increases due to oxidation. In addition, we also briefly discuss theoretical agglomerate formation models and compare them to experimental data. (C) 2013 Elsevier B.V. All rights reserved.