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相关概念视频

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
Transmission Electron Microscopy01:15

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...
Diamagnetism01:26

Diamagnetism

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.

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相关实验视频

Updated: Jul 15, 2026

Studying Dynamic Processes of Nano-sized Objects in Liquid using Scanning Transmission Electron Microscopy
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现场TEM成像揭示了金纳米颗粒中吸引力,排斥力和顺序吸引力-排斥力之间的动态相互作用.

Abid Zulfiqar1, Mari Honkanen1,2, Nonappa1

  • 1Faculty of Engineering and Natural Sciences, Tampere University, Tampere, FI-33720, Finland.

Small (Weinheim an der Bergstrasse, Germany)
|October 8, 2024
PubMed
概括

电子束辐射可以导致金纳米粒子 (Au NPs) 排斥,而不仅仅是凝聚. 这项研究揭示了Au NPs中独特的吸引力-排斥行为,可以通过电子剂量和大小来控制.

关键词:
凝聚力 凝聚力 是一种凝聚力.在现场的TEM.纳米粒子的吸引力和排斥力纳米粒子操纵的操纵方法纳米规模的动力学结构转型 结构转型

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 表面科学是一门学科.

背景情况:

  • 对金属纳米粒子 (NP) 的电子束操纵提供了对它们的行为,结构变化和新兴性质的洞察.
  • 虽然电子束诱导的NP凝聚越来越被理解,但排斥等现象仍未得到充分研究.

研究的目的:

  • 在电子束辐射下研究金纳米粒子 (Au NPs) 之间的排斥和吸引现象.
  • 探索NP大小和电子剂量率对粒子间相互作用和动态的影响.

主要方法:

  • 利用现场传输电子显微镜 (TEM) 来实时成像纳米粒子相互作用.
  • 采用小 (≈5.9 nm) 和大 (≈11.0 nm) 黄金纳米粒子 (Au NPs).
  • 变化的电子剂量率,以观察动态的NP行为.

主要成果:

  • 证明NP排斥在室温电子束辐射下与凝聚一样有利.
  • 观察到Au NPs中独特的顺序吸引-排斥行为,取决于大小和电子剂量.
  • 量化排斥率:低剂量率显示小AuNP在0.4nm/min时排斥,大AuNP在0.08nm/min时排斥.
  • 发现大型Au NPs在高电子剂量速率下表现出最初的吸引力 (15分钟),随后是快速的排斥.

结论:

  • 电子束辐射可以诱导金纳米粒子之间的吸引力和排斥力,挑战唯一的聚合焦点.
  • 观察到的顺序吸引-排斥行为为控制粒子间距离提供了一个新的机制.
  • 在不改变NP尺寸的情况下,这种可控制的粒子间距离操纵对先进的光子和等离子纳米设备具有前景.