Gu Pei-Yang, Zhou Feng, Xie Ganhua, Kim Paul Y, Chai Yu, Hu Qin, Shi Shaowei, Xu Qing-Feng, Liu Feng, Lu Jian-Mei, Russell Thomas P
College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China.
Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA.
Angew Chem Int Ed Engl. 2021 Apr 12;60(16):8694-8699. doi: 10.1002/anie.202016217. Epub 2021 Mar 8.
With the interfacial jamming of nanoparticles (NPs), a load-bearing network of NPs forms as the areal density of NPs increases, converting the assembly from a liquid-like into a solid-like assembly. Unlike vitrification, the lineal packing of the NPs in the network is denser, while the remaining NPs can remain in a liquid-like state. It is a challenge to determine the point at which the assemblies jam, since both jamming and vitrification lead to a solid-like behavior of the assemblies. Herein, we show a real-time fluorescence imaging method to probe the evolution of the interfacial dynamics of NP surfactants at the water/oil interface using aggregation-induced emission (AIE) as a reporter for the transition of the assemblies into the jammed state. The AIEgens show typical fluorescence behavior at densities at which they can move and rotate. However, when aggregation of these fluorophores occurs, the smaller intermolecular separation distance arrests rotation, and a significant enhancement in the fluorescence intensity occurs.
随着纳米颗粒（NPs）的界面堵塞，随着NPs面密度的增加，会形成一个NPs的承载网络，从而使组装体从类似液体的状态转变为类似固体的组装体。与玻璃化不同，网络中NPs的线性堆积更致密，而其余的NPs可以保持类似液体的状态。确定组装体堵塞的点是一项挑战，因为堵塞和玻璃化都会导致组装体呈现类似固体的行为。在此，我们展示了一种实时荧光成像方法，以聚集诱导发光（AIE）作为组装体转变为堵塞状态的报告分子，来探测水/油界面处NP表面活性剂的界面动力学演变。AIEgens在它们能够移动和旋转的密度下表现出典型的荧光行为。然而，当这些荧光团发生聚集时，较小的分子间分离距离会阻止旋转，并且荧光强度会显著增强。
