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相关概念视频

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
419
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
405

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相关实验视频

Updated: Jul 7, 2025

Optical Trapping of Nanoparticles
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使用基于多种技术的微拉曼光谱仪检测10nm以下的纳米粒子.

Allan Bereczki1, Jessica Dipold1, Anderson Z Freitas1

  • 1Nuclear and Energy Research Institute-IPEN-CNEN, São Paulo 05508-000, Brazil.

Polymers
|December 23, 2023
PubMed
概括

这项研究引入了一种新的方法来表征微小的纳米污染物. 它使用微拉曼光谱和原子力显微镜检测小到9纳米的粒子,帮助环境安全研究.

科学领域:

  • 环境科学 环境科学
  • 分析化学 分析化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 微塑料和人工纳米颗粒污染对生物和生态系统构成风险.
  • 纳米级污染物的丰富性正在增加,但由于有限的表征技术,它们的风险在很大程度上仍然未知.
  • 目前用于纳米粒子表征的方法通常是复杂和耗时的.

研究的目的:

  • 开发一种可靠的,多技术的方法来表征10纳米的纳米粒子.
  • 展示标准微拉曼光谱和原子力显微镜用于单个纳米粒子分析的能力.
  • 为先进的技术提供更容易获得的替代方案,如尖端增强拉曼光谱.

主要方法:

  • 使用标准微拉曼光谱和标准原子力显微镜的组合.
  • 实现纳米粒子单粒子光谱分析.
  • 描述聚乙烯 (25nm) 和二氧化 (9nm) 的纳米粒子.

主要成果:

  • 从25nm聚钢和9nmTiO2纳米粒子成功获得单颗粒光谱.
  • 对TiO2纳米颗粒的检测质量限制低至1.6亚图克.
  • 从单个小的纳米粒子中证明了明确的拉曼信号检测.
关键词:
拉曼光谱法 拉曼光谱法 拉曼光谱法新出现的污染物.微塑料微塑料的使用纳米塑料是一种纳米塑料.氧化是一种氧化.

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结论:

  • 拟议的多技术方法使得纳米级污染物的敏感表征成为可能.
  • 这种方法为更复杂的纳米粒子分析技术提供了可行和高效的替代方案.
  • 这些发现为更好地理解和减轻纳米污染物风险铺平了道路.