纳米级近红外发射聚合物聚合物的超快兴奋状态动态
Timothy V Duncan1, P Peter Ghoroghchian, Igor V Rubtsov
1Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Journal of the American Chemical Society
|July 10, 2008
概括
近红外 (NIR) 聚合体由共聚物和NIR光体组成,可用于深层组织成像. 优化这些囊泡内的光体结构和分散,可以增强它们的发光特性,用于敏感的诊断.
科学领域:
- 软物质物理学 软物质物理学
- 聚合物科学 聚合物科学
- 纳米技术纳米技术
- 生物物理学的生物物理.
背景情况:
- 发射NIR的聚合体是软物质囊泡,由两性双块共聚物和NIR光体的自组合形成.
- 这些聚合体因其有机性质和可调节性质而有望用于深层组织光学成像和诊断.
- 了解这些系统的纳米组织和光物理对于优化它们的性能至关重要.
研究的目的:
- 为了研究聚合体体内的结构和NIR光体组织.
- 为了将发射器的结构性质和负载与囊泡的发射输出相关联.
- 探索NIR发射聚合体中激发状态衰变的度依赖机制.
主要方法:
- 魔法角度和极化探针光谱学.
- 超快兴奋状态的短暂吸收光谱学.
- 不同类型的动态研究.
- 在纳米级囊泡中,不同光体负荷 (0.1-10 mol %).
主要成果:
- 聚合物链约束光合体,并在疏水双层中分散它们.
- 光荷载度影响非辐射激发状态衰变路径.
- 纳米领域内的光体的空间排列和分隔影响光物理性质.
- 能量转移动态受到光体分散和囊泡纳米结构的影响.
结论:
- 光体结构及其在聚合体内的空间布局显著影响排放性质.
- 在囊泡环境中优化光体分散和细分,提高了纳米级探测器的性能.
- 这项工作为设计用于成像和诊断的先进的NIR发射纳米粒子提供了洞察力.
更多相关视频
12:51A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
Published on: November 14, 2015
09:57Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
相关概念视频
01:19Protein Dynamics in Living Cells
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
01:23Photoluminescence: Fluorescence and Phosphorescence
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...