液体中纳米级域之间的磁相互作用
Mohammadhasan Dinpajooh1, Giovanna Ricchiuti1, Andrew J Ritchhart1
1Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
The Journal of chemical physics
|July 1, 2025
概括
外部磁场 (eMFs) 显著改变局部磁纳米粒子 (LMNPs) 之间的相互作用. 这些场可以使LMNP相互作用更有吸引力或排斥力,从而影响纳米粒子聚合.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 液体中纳米级粒子之间的相互作用受到外部磁场 (eMF) 的影响.
- 电磁场对这些相互作用的确切影响尚不清楚.
- 纳米粒子通常含有局部化的磁域.
研究的目的:
- 在外部磁场下的溶剂中模拟和研究局部磁纳米粒子 (LMNPs) 之间的有效相互作用.
- 了解磁性纳米领域如何影响纳米粒子相互作用与单个离子相比.
主要方法:
- 一个简化模型的solvated纳米颗粒与表面磁性纳米领域被开发.
- 经典密度函数理论被用来计算有效相互作用.
- 在考虑静电力,范德瓦尔斯力,水合力和磁双极力时,分析了相互作用.
主要成果:
- 纳米领域的磁双极相互作用可以与其他力量竞争,如范德瓦尔斯力和水合力.
- 外部磁场显著改变LMNP相互作用,使它们在短距离 (<1 nm) 上更具吸引力或排斥力.
- 溶剂相关性导致LMNP相互作用中的振荡行为,不受eMF的影响.
结论:
- 外部磁场在纳米粒子与磁性纳米领域的聚合中起着至关重要的作用.
- 该模型表明,纳米领域的磁时刻是eMF影响相互作用的关键驱动因素.
- 了解这些eMF驱动的相互作用对于控制纳米粒子组装和行为至关重要.
相关概念视频
Van der Waals Interactions
66.7K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
66.7K
Ferromagnetism
2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.5K
Intermolecular Forces
61.3K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
61.3K
Noncovalent Attractions in Biomolecules
55.5K
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
55.5K
Intermolecular Forces and Physical Properties
22.7K
22.7K
Diamagnetism
2.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.5K


