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相关概念视频

Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...

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相关实验视频

Updated: May 8, 2026

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
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短波红外升级纳米粒子

Xiao Qi1, Changhwan Lee2, Benedikt Ursprung2

  • 1The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|October 21, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了新的基于化物的上转化纳米粒子 (UCNP),可以有效地将短波红外光 (SWIR) 转化为可检测的信号. 这些响应SWIR的探测器为生物成像提供了新的可能性,对先进的视觉技术至关重要.

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科学领域:

  • 纳米技术
  • 光学物理
  • 材料科学

背景情况:

  • 光学技术提供非侵入性分析,但受到光谱区域的限制.
  • 短波红外 (SWIR) 波长允许深度透和减少光损伤,但合适的发光探测器很少.

研究的目的:

  • 在SWIR区域发现可激发的基于化物的新型上转化纳米粒子 (UCNPs).
  • 使用响应SWIR的探测器实现新的生物成像窗口和先进的视觉技术.

主要方法:

  • 使用微分速率方程建模选兰化物 (Ln3+) 离子组合.
  • 对上转换的光发光激发 (U-PLE) 光谱的实验性表征.
  • 机械建模以了解能量传输路径.

主要成果:

  • 在NaYF4核心/外UCNP中确定了Ho3+/Tm3+或Tm3+补充剂,用于高效的SWIR激发.
  • 在1740或1950纳米处证明了SWIR激发,产生强烈的可见或NIR-I发射.
  • 展示了将Ho3+添加转移到652nm以提高SWIR能量接受和再分配.

结论:

  • 开发了响应SWIR的UCNP,开启了一个新的IR生物成像窗口.
  • 速率方程模型准确地预测了特定激发和发射波长的UCNP组成.
  • 这些探测器对于视觉技术和深层地下分析至关重要.