纳米颗粒
纳米材料
材料科学
半径
激发
原子半径
纳米技术
曲面(拓扑)
表面积体积比
粒径
化学物理
化学
物理
物理化学
热力学
量子力学
几何学
有机化学
数学
计算机科学
计算机安全
出处
期刊:Engineering materials
日期:2015-01-01
卷期号:: 73-111
被引量:11
标识
DOI:10.1007/978-3-662-47314-6_5
摘要
The physical properties of the material significantly depend on their size when reduced to nanodimension. In bulk system, most of the atoms are the interior atoms, so the properties of the materials are determined by them. But in the case of nanoparticles, the fraction of surface atoms cannot be neglected. To illustrate the increasing contribution of surface atoms, let us consider the following example of spherical nanoparticle having radius "r." Thus surface-(S)-to-volume (V) ratio (S/V) = 3/r for such nanoparticle dramatically increases as its size is reduced Since surface atoms have different environment in contrast to interior atoms, their behaviors to any external excitation are completely different. The size effect becomes prominent when their size is ~5–50 nm.
科研通智能强力驱动
Strongly Powered by AbleSci AI