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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...

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Updated: May 14, 2026

Microfluidic-based Synthesis of Covalent Organic Frameworks (COFs): A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks (COFs): A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

Liquid Crystal Induced Large-Area Continuous Covalent Organic Framework Films for High-Performance Humidity Sensors.

Ru Liu1, Xianyang Yue1, Jing Li1

  • 1Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method using liquid crystals to create large, continuous covalent organic framework (COF) films for advanced humidity sensors. This technique overcomes previous limitations, enabling faster and more durable sensor performance.

Keywords:
covalent organic frameworkco‐assemblyhumidity sensorinterface polymerizationliquid crystal

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • High-performance humidity sensors require large-area, continuous covalent organic framework (COF) films.
  • Conventional COF film synthesis methods face challenges like harsh conditions, fragility, and long processing times.

Purpose of the Study:

  • To develop a novel, versatile method for fabricating large-area COF films.
  • To overcome limitations of existing COF film synthesis techniques.
  • To create advanced COF films for high-performance humidity sensors.

Main Methods:

  • Utilized a liquid crystal (LC)-assisted fabrication approach for COF films.
  • Investigated the role of non-covalent interactions induced by LC molecules in precursor self-assembly.
  • Fabricated and tested COF film-based humidity sensors.

Main Results:

  • Achieved a universal method for synthesizing various COF films over large areas.
  • Demonstrated that LC molecules promote dense packing and ordered self-assembly, preventing film fragmentation.
  • The resulting COF film sensor showed a fast response time (4.45 s), rapid recovery (1.95 s), and high sensitivity (13.90 mΩ/%RH).

Conclusions:

  • The LC-assisted method offers a versatile strategy for large-area COF film fabrication.
  • This approach enables the development of robust, high-performance humidity sensors.
  • Provides guidance for designing advanced active layers for humidity sensing applications.