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相关概念视频

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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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.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Overview of Electron Microscopy01:25

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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Preparation of Samples for Electron Microscopy01:20

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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一个简单的,静态和舞台安装的基于直接电子探测器的电子反射散射衍射系统.

Tianbi Zhang1, T Ben Britton1

  • 1Department of Materials Engineering, The University of British Columbia, 309-6350 Stores Road, Vancouver, BC V6T 1Z4, Canada.

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PubMed
概括
此摘要是机器生成的。

本研究介绍了一种紧的,开放硬件的电子反射衍射 (EBSD) 系统,用于先进材料的表征. 新设计为商业系统提供了更简单,更容易获得的替代方案,促进了EBSD技术的更广泛使用.

关键词:
直接的电子检测检测直接的电子检测电子背散衍射 (EBSD) 是一种电子背散衍射.

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相关实验视频

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科学领域:

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 分析化学 分析化学

背景情况:

  • 先进的材料工程依赖于详细的微观结构特征.
  • 电子反射衍射 (EBSD) 是通过基库奇衍射模式生成微结构图的关键技术.
  • 传统的EBSD系统通常涉及大型的专用探测器,限制了可访问性.

研究的目的:

  • 为电子反射衍射 (EBSD) 提供一个可访问的,开放的硬件解决方案.
  • 为了展示一个简单的,静态几何体的紧的EBSD系统.
  • 促进开源软件和硬件在微结构分析中的使用.

主要方法:

  • 开发了一个紧的EBSD系统,使用一个现成的直接电子探测器与样品一起安装.
  • 通过软件API集成的显微镜和探测器控制.
  • 利用开源的AstroEBSD软件进行衍射模式分析.

主要成果:

  • 开发的系统具有简单的静态几何结构,用于改进衍射分析.
  • 通过线扫描和区域绘图实验成功演示了EBSD.
  • 开放硬件方法提供了一个具有成本效益和可访问的替代方案.

结论:

  • 呈现的紧型EBSD系统提高了对微观结构特征的可访问性.
  • 这种开放硬件解决方案可以激发更简单,更广泛的EBSD系统设计.
  • 促进开源工具在材料科学工作流程中的整合.