多功能光子Janus粒子
Qilin He1, Harikrishnan Vijayamohanan1, Jie Li1
1Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|March 17, 2022
概括
研究人员从块共聚物中开发了可调节的光子Janus粒子. 这些粒子具有视角依赖的结构颜色,可用于磁控和敏感生物传感,包括病原体检测.
科学领域:
- 材料科学
- 纳米技术
- 聚合物化学
背景情况:
- 摄影粒子具有可调节的光学特性.
- 对于多功能应用而言,
- 块共聚物是可自组装的多功能构件.
研究的目的:
- 通过相分离块共聚物合成新的光子Janus粒子.
- 为了实现可调节的结构颜色和磁性响应.
- 展示生物传感中的潜在应用,特别是病原体检测.
主要方法:
- 通过溶剂蒸发油在水中的乳液制造光子Janus颗粒,使用丹德罗化刷块共聚物 (den-BBCP) 和聚4-乙烯) -r-聚烯 (P4VP-r-PS).
- 丹-BBCP的自组合形成了负责结构颜色的有序状结构.
- 用Fe3O4纳米粒子对P4VP-r-PS阶段进行表面修饰以进行磁性控制和抗体固定以进行生物传感.
主要成果:
- 通过调整den-BBCP分子重量,成功创建了球形形的光子Janus粒子,其结构颜色取决于角度.
- 通过涂层Fe3O4纳米粒子实现了反射颜色的实时磁性控制.
- 用于生物传感应用,对Fe3O4表面抗体进行静电固定.
结论:
- 开发了具有可调节结构颜色和磁性响应的多功能光子Janus粒子.
- 验证了这些颗粒对敏感生物传感的潜力,以沙门氏菌检测传感器为例.
- 突出了视角依赖的结构颜色在传感机制中的重要性.
相关概念视频
01:14Photoluminescence: Applications
515
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
515
02:26Photoelectric Effect
33.0K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
33.0K