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Ferromagnetism01:31

Ferromagnetism

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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...
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Molecular Comparison of Gases, Liquids, and Solids02:26

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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Transmission-based precautions are for patients known to be infected or suspected to be infected or colonized with organisms that pose a significant risk to others. Some transmission-based precautions include contact, enteric, and droplet.
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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
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High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
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High Throughput Analysis of Liquid Droplet Impacts
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可重新配置的铁磁液滴

Xubo Liu1,2, Noah Kent2,3, Alejandro Ceballos4

  • 1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

Science (New York, N.Y.)
|July 20, 2019
PubMed
概括
此摘要是机器生成的。

研究人员通过阻塞磁纳米粒子开发了可重新配置的铁磁液滴. 这些液滴在移除磁场后仍然保持着磁性,从而使活性物质和可编程液体结构能够精确的遥控.

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科学领域:

  • 材料科学
  • 软物质物理学
  • 纳米技术

背景情况:

  • 固体铁磁铁是刚性和不可改变的.
  • 铁流体可以重新配置,但如果没有磁场,就会失去磁化.

研究的目的:

  • 创建可重新配置的磁性液滴.
  • 在液体结构中实现稳定的铁磁性质.

主要方法:

  • 在水-油接口组装磁性纳米粒子单层.
  • 诱导干扰以创建一个可逆的偏磁到铁磁过渡.

主要成果:

  • 形成了具有强制性和残留磁性的铁磁液滴.
  • 这些液滴在移除磁场后保持磁性.
  • 滴滴可以重新配置成各种形状.

结论:

  • 新的铁磁液滴提供了可重构性和稳定的磁性.
  • 精确的远程操作滴滴运动是可能的.
  • 潜在的应用包括活性物质,能量分散组件和可编程液体结构.