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Updated: Mar 7, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Laser Ultrafast In Situ-Integrated COF Crystals.

Ziyu Liu^1,2, Xin Wen^1,2, Chenqi Yi^1,2

¹Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

The Journal of Physical Chemistry Letters

|March 6, 2026

Summary

Researchers developed a laser-based method for rapid covalent organic framework (COF) crystallization, overcoming slow synthesis limitations. This technique enables on-demand, in situ fabrication of COF microstructures in seconds.

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Published on: August 6, 2018

Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Covalent organic frameworks (COFs) synthesis is hindered by slow imine bond dynamics and high activation energies.
Traditional solvothermal methods for COF crystallization are time-consuming (hours to days) and lack precise control.

Purpose of the Study:

To develop a rapid, controlled, and in situ crystallization strategy for COFs.
To overcome the limitations of conventional solvothermal synthesis for dynamic covalent materials.

Main Methods:

Utilized a 473 nm continuous-wave laser to create a photothermal microreactor at the solid-liquid interface.
Employed Gaussian focusing to generate localized hotspots and steep temperature gradients for nonequilibrium crystallization.
Achieved dynamic covalent exchange in an ultrafast, far-from-equilibrium regime.

Main Results:

COF-300 nucleated and grew in situ within seconds, without catalysts.
Demonstrated real-time, deterministic control over nucleation and crystal growth using laser power and exposure.
Enabled direct laser writing of ordered COF microstructures with submicrometer spatial confinement.

Conclusions:

Established an accessible nonequilibrium crystallization strategy for dynamic covalent materials.
Presented a generalizable method for rapid, programmable crystallization of COFs.
Opened possibilities for on-demand, in situ integration of COF microcrystals for photonic applications.