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Peer-reviewedCC BY-NC-NDPolymer science & technology (Washington, D.C.)

Powder-to-Hydrogel System with Fast Water Absorption for Evaporative Cooling

  • Lebin Shang1
  • Jiayao Xu2
  • Wenjun Peng3
  • Jiayun Yu1
  • Xiao Zeng4
  • Jintao Cai4
  • Chujun Ni1
  • Qian Zhao2
4 affiliations
  1. 1Eye Center, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310009, China.
  2. 2Zhejiang Key Laboratory of Smart Biomaterials, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.
  3. 3School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
  4. 4Taizhou Power Supply Company, State Grid Zhejiang Electric Power, Taizhou 317100, China.
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Abstract

Water-based evaporative cooling plays an important role in industrial thermal management. Porous hydrogels, which retain water within interconnected channels to serve as reservoirs for continuous evaporation, are promising materials for water-efficient cooling. However, compatibility between in situ formation and fast water absorption of the material as a coating remains a challenge. Here, we report a powder-to-hydrogel system enabling in situ formation of superhydrophilic porous hydrogel coating in a facile manner. An ionic polymer providing phenylboronic acid was introduced into a poly-(vinyl alcohol) (PVA) and tannic acid (TA) powder system. Upon hydration, the powders rapidly converted into a hydrogel coating, where the ionic polymer was chemically anchored to the PVA-TA network via the formation of boronate ester bonds. This structural integration can drastically double the water uptake speeds and the overall water absorption capacity compared to pristine PVA-TA. Consequently, in a simulated solar panel cooling experiment with intermittent spraying, this coating successfully suppressed the temperature rise by over 48% compared to that of conventional strategies. Featuring large water capacity and rapid replenishment, this powder-based coating offers significant advantages for superior, long-lasting industrial cooling.

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Cite

BibTeXRIS
BibTeX
@article{shang2026powdertohydrogel,
  title = {{Powder-to-Hydrogel System with Fast Water Absorption for Evaporative Cooling}},
  author = {Lebin Shang and Jiayao Xu and Wenjun Peng and Jiayun Yu and Xiao Zeng and Jintao Cai and Chujun Ni and Qian Zhao},
  journal = {Polymer science \& technology (Washington, D.C.)},
  year = {2026},
  month = sep,
  doi = {10.1021/polymscitech.6c00078},
  url = {https://europepmc.org/article/PMC/PMC13718369},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - Powder-to-Hydrogel System with Fast Water Absorption for Evaporative Cooling
AU  - Lebin Shang
AU  - Jiayao Xu
AU  - Wenjun Peng
AU  - Jiayun Yu
AU  - Xiao Zeng
AU  - Jintao Cai
AU  - Chujun Ni
AU  - Qian Zhao
PY  - 2026
DA  - 2026/09/07
JO  - Polymer science & technology (Washington, D.C.)
DO  - 10.1021/polymscitech.6c00078
UR  - https://europepmc.org/article/PMC/PMC13718369
AB  - Water-based evaporative cooling plays an important role in industrial thermal management. Porous hydrogels, which retain water within interconnected channels to serve as reservoirs for continuous evaporation, are promising materials for water-efficient cooling. However, compatibility between in situ formation and fast water absorption of the material as a coating remains a challenge. Here, we report a powder-to-hydrogel system enabling in situ formation of superhydrophilic porous hydrogel coating in a facile manner. An ionic polymer providing phenylboronic acid was introduced into a poly-(vinyl alcohol) (PVA) and tannic acid (TA) powder system. Upon hydration, the powders rapidly converted into a hydrogel coating, where the ionic polymer was chemically anchored to the PVA-TA network via the formation of boronate ester bonds. This structural integration can drastically double the water uptake speeds and the overall water absorption capacity compared to pristine PVA-TA. Consequently, in a simulated solar panel cooling experiment with intermittent spraying, this coating successfully suppressed the temperature rise by over 48% compared to that of conventional strategies. Featuring large water capacity and rapid replenishment, this powder-based coating offers significant advantages for superior, long-lasting industrial cooling.
SN  - 2997-3279
ER  -