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Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Updated: Jul 9, 2026

Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

吸引粒子的阻塞相位图.

V Trappe¹, V Prasad, L Cipelletti

¹Department of Physics and DEAS, Harvard University, Cambridge, Massachusetts 02138, USA.

|July 19, 2001

概括

这项研究表明,体系统中的吸引力模仿压力,导致流体到固体的阻塞过渡. 这些发现将凝结和聚合等概念统一在一个更广泛的杂相位图中.

科学领域:

* 物理学物理
* 材料科学材料科学
* 体科学体科学

背景情况:

*许多系统通过动态停止从类似流体的状态过渡到类似固体的状态.
*这种干扰现象是由粒子拥挤和动力捕获驱动的.
*有吸引力的相互作用被假定会影响阻塞,类似于压力.

研究的目的:

* 实验性地研究弱吸引力体颗粒的液体到固体的过渡.
* 确定有吸引力的相互作用是否可以整合到一个通用的干扰相位图中.
* 探索凝,玻璃过渡和聚合在体系统中的关系.

主要方法:

* 实验研究具有较弱吸引力的体粒子系统.
*通过度变化,热化和应用于应力所引起的液态固态转换的观察.
*分析过渡期间的凝行为和结构变化.

主要成果:

* 吸引力较弱的体颗粒表现出类似于堵塞的凝行为.
* 增加颗粒度和减少热化或应力促进了流体到固体的过渡.
* 实验结果支持吸引力系统的阻塞相图概念.

结论:

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Last Updated: Jul 9, 2026

Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Optical Trap Loading of Dielectric Microparticles In Air

Optical Trap Loading of Dielectric Microparticles In Air

Published on: February 5, 2017

* 合体系统中的吸引力相互作用有效地起到限制压力的作用,诱导阻塞.
* 一个统一的干扰相图可以描述排斥性和吸引性体系统中的过渡.
* 这项工作提供了不同的现象之间的联系,如玻璃过渡,凝和聚合.