重构光响应混合合体的自组
Ning Kang1, Jiao Zhu1, Xiaoliang Zhang1
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
Journal of the American Chemical Society
|March 10, 2022
概括
研究人员创造了可重组的光响应混合合体. 这些粒子形成了类似链条和花形的动态结构, 可以通过光和磁场控制适应性材料.
科学领域:
- 材料科学
- 体科学
- 纳米技术
背景情况:
- 体颗粒自组可以自下而上制造适应性材料.
- 控制自组装动态和重新配置仍然是一个重大挑战.
研究的目的:
- 合成有光反应的Fe2O3/多二氧化混合合物.
- 通过光诱导的化学梯度来证明动态重组的自组装.
主要方法:
- 合成Fe2O3 / 聚烯混合合物.
- 使用紫外线辐射诱导H2O2分解和化学梯度.
- 应用外部磁场来操纵自组装的结构.
主要成果:
- 实现动态自组装成链条和花结构.
- 在现场证明链条转化为紫外线强度下降的花型结构.
- 展示了磁场诱导的转换到有序的集群,形成自动推进的微型电机.
结论:
- 开发了一种用于控制和重新配置合体自组合的新方法.
- 开辟了制造适应性和智能微观材料的途径.
- 突出了光敏合体在先进材料设计中的潜力.
相关概念视频
Resonance and Hybrid Structures
20.0K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
20.0K
Photochemical Electrocyclic Reactions: Stereochemistry
1.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.4K
Radical Reactivity: Overview
2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K
Anionic Chain-Growth Polymerization: Mechanism
1.7K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
1.7K
Cationic Chain-Growth Polymerization: Mechanism
2.1K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.1K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
1.7K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
1.7K


