Volume 60, Issue 16 pp. 8694-8699
Communication

Visualizing Interfacial Jamming Using an Aggregation-Induced-Emission Molecular Reporter

Dr. Pei-Yang Gu

Dr. Pei-Yang Gu

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

These authors contributed equally to this work.

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Dr. Feng Zhou

Dr. Feng Zhou

College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 China

These authors contributed equally to this work.

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Dr. Ganhua Xie

Dr. Ganhua Xie

Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720 USA

These authors contributed equally to this work.

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Dr. Paul Y. Kim

Dr. Paul Y. Kim

Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720 USA

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Dr. Yu Chai

Dr. Yu Chai

Department of Physics, City University of Hong Kong, Kowloon, China

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Dr. Qin Hu

Dr. Qin Hu

Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720 USA

School of Microelectronics, University of Science and Technology of China, Hefei, Anhui, 230026 China

Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA, 01003 USA

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Dr. Shaowei Shi

Dr. Shaowei Shi

Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029 China

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Prof. Qing-Feng Xu

Prof. Qing-Feng Xu

College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 China

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Dr. Feng Liu

Dr. Feng Liu

Department of Physics and Astronomy, Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiaotong University, Shanghai, 200240 P. R. China

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Prof. Jian-Mei Lu

Corresponding Author

Prof. Jian-Mei Lu

College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 China

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Prof. Thomas P. Russell

Corresponding Author

Prof. Thomas P. Russell

Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720 USA

Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA, 01003 USA

Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029 China

Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577 Japan

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First published: 24 January 2021
Citations: 28

Graphical Abstract

With the interfacial jamming of nanoparticles (NPs), a load-bearing network of NPs forms as the areal density of NPs increases, converting a liquid-like assembly into a solid-like assembly. Real-time fluorescence imaging has been used to probe the evolution of the interfacial dynamics of nanoparticle surfactants at the water/oil interface by using aggregation-induced emission as a reporter for the transition of the assemblies into the jammed state (see graph).

Abstract

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.

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