Surface Modification for Improving the Stability of Nanoparticles in Liquid Media
Surface Modification for Improving the Stability of Nanoparticles in Liquid Media
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DOI：
10.14356/kona.2009012
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发表时间：
2009
影响因子：
4.1
通讯作者：
M. Iijima;H. Kamiya
中科院分区：
文献类型：
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作者：
M. Iijima;H. Kamiya
今天，纳米颗粒已经成为工业不可或缺的材料，因为它们具有独特的尺寸依赖性，如电，磁，机械，光学和化学性质，这些性质与它们的块体材料有很大不同。由于纳米颗粒具有与亚微米级颗粒不同的表面结构和表面相互作用，因此纳米颗粒具有极高的粘附和聚集倾向。因此，开发控制纳米粒子分散/聚集现象的技术以将其应用于功能材料和产品是非常重要的。在水介质分散体方面，DLVO理论是控制和表征分散现象的一个非常有用的工具。然而，如何控制高负载量纳米颗粒悬浮液或悬浮液在有机介质中的稳定性仍然是一个具有挑战性的问题。纳米粒子的表面改性是提高纳米粒子在这些具有挑战性的条件下的分散稳定性的最被接受的方法之一。在纳米粒子表面改性方面，根据纳米粒子的种类和液体介质的不同，设计纳米粒子的表面结构是非常重要的。在这篇综述中，我们将首先介绍纳米颗粒如此容易形成聚集体的一些原因。然后，各种表面改性技术将审查各种纳米粒子分散到各种液体介质。
Today, nanoparticles have already became an indispensable material for industries because of their unique size dependent properties such as electrical, magnetic, mechanical, optical and chemical properties, which largely differ from those of their bulk materials. Since nanoparticles have different surface structures and surface interactions compared to the sub-micron sized particles, nanoparticles have an extremely high tendency of adhesion and aggregation. Thus, it is quite important to develop techniques to control the dispersion/aggregation phenomena of nanoparticles to apply them into functional materials and products. In terms of aqueous media dispersions, DLVO theory is a quite useful tool to control and characterize the dispersion phenomena. However, it is still a challenging issue to control the stability of suspension with highly loaded nanoparticles or suspensions in organic media. Surface modification of nanoparticles is one of the mostly accepted methods to improve the dispersion stability of nanoparticles in those challenging conditions. On modifying nanoparticle surface, it is quite important to design the surface structure based on the type of nanoparticles and the liquid media. In this review, we will first introduce some reasons why nanoparticles form aggregates so easily. Then, various surface modification techniques will be reviewed for the dispersion of various nanoparticles into various liquid media.