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Smart Sponge for Fast Liquid Absorption and Thermal Responsive Self-Squeezing.

Ying Cui1, Yujie Wang1, Ziyu Shao1

  • 1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.

Advanced Materials (Deerfield Beach, Fla.)
|February 22, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a smart polyurethane sponge that rapidly absorbs viscous liquids like crude oil. Its unique structure allows for efficient recycling via a heat-activated self-squeezing mechanism, offering a cost-effective solution.

Keywords:
directional freezingfast liquid absorptionliquid recyclingthermal responsivenesstortuosity

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Liquid absorption and recycling are vital for industrial and environmental processes, including oil spill cleanup and resource recovery.
  • Existing absorbent materials face challenges in achieving fast absorption and efficient, cost-effective recycling, particularly for viscous liquids.
  • Viscous liquids like crude oil present unique difficulties for absorption and recovery technologies.

Purpose of the Study:

  • To develop a novel absorbent material capable of fast liquid uptake and efficient, energy-saving recycling.
  • To engineer a smart sponge with an aligned porous structure for enhanced liquid transport.
  • To incorporate a thermally responsive mechanism for remote liquid expulsion and material reuse.

Main Methods:

  • Fabrication of a polyurethane-based porous sponge using directional freezing to create an aligned channel structure.
  • Characterization of the sponge's porous architecture and liquid absorption properties, focusing on tortuosity and capillary effects.
  • Integration of a shape memory effect triggered by heating for remote, self-squeezing liquid recovery.

Main Results:

  • The smart sponge exhibited significantly faster liquid absorption compared to conventional sponges with random porous structures, attributed to lower tortuosity and enhanced capillary action.
  • The aligned channel structure facilitated rapid liquid uptake, demonstrating a notable improvement in absorption speed.
  • A thermally responsive shape memory effect enabled efficient and remote squeezing of absorbed viscous liquids, facilitating recycling.

Conclusions:

  • The developed polyurethane sponge with an aligned channel structure offers superior liquid absorption speed and efficient recycling capabilities.
  • The smart sponge's thermally triggered self-squeezing mechanism presents a novel approach for cost-effective and energy-saving liquid recovery.
  • This material holds significant potential for applications requiring high-performance liquid absorption and recycling, such as oil spill remediation.