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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Ultradense Network Hydrogels for Rapid Solar Vapor Generation.

Bin Wang1,2, Hui Zhu1, Huhu Cheng3

  • 1State Key Laboratory of Black Soils Conservation and Utilization, Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.

Nano Letters
|September 22, 2025
PubMed
Summary

Researchers developed a novel interpenetrating network hydrogel (IPNH) with a mesoporous structure. This durable hydrogel achieves high evaporation rates and offers excellent antifouling properties for practical applications.

Keywords:
high evaporation performancelong-term durabilitylow evaporation enthalpymesoporous hydrogelsolar water evaporation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Hydrogel evaporators offer high evaporation rates, exceeding thermal limits.
  • Macroporous hydrogels are preferred for high evaporation but suffer from pore collapse and degradation.
  • Existing hydrogels have limited durability due to salt crystallization, impurities, and microbial contamination.

Purpose of the Study:

  • To develop a novel hydrogel evaporator with enhanced durability and high evaporation efficiency.
  • To investigate the performance of mesoporous hydrogels as alternatives to macroporous hydrogels.
  • To address the limitations of current hydrogel evaporators in long-term applications.

Main Methods:

  • Fabrication of an interpenetrating network hydrogel (IPNH) with a mesoporous structure (4.2 nm pores).
  • Characterization of the hydrogel's structure, water activation, and evaporation enthalpy.
  • Evaluation of the hydrogel's evaporation rate under 1-sun irradiation and assessment of its durability and antifouling properties.

Main Results:

  • The IPNH achieved a 1-sun evaporation rate of 4.4 kg m-2 h-1, outperforming many macroporous hydrogels.
  • The hydrogel exhibited a record-low water evaporation enthalpy (747 J/g at 23 °C) due to its hydrophilic dense network.
  • The mesoporous structure ensured long-term durability and excellent antifouling capability, preventing pore collapse and contamination.

Conclusions:

  • The developed mesoporous IPNH overcomes the limitations of macroporous hydrogels, offering superior evaporation efficiency and durability.
  • The unique structure enables efficient water transport and heat management, leading to enhanced performance.
  • This hydrogel shows significant promise for practical applications in water evaporation and related technologies.