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Updated: Aug 17, 2025

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Slippery Shape Memory Tube for Smart Droplet Transportation.

Ruijie Wang1, Fan Jin1, Yufen Li1

  • 1State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin150090, P. R. China.

ACS Applied Materials & Interfaces
|December 16, 2022
PubMed
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Researchers developed a novel shape memory polymer tube inspired by the Nepenthes pitcher plant. This smart tube enables controllable transportation of diverse liquids, including water and oils, overcoming limitations of previous methods.

Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Microfluidics

Background:

  • Controllable droplet transportation in tubes is challenging due to reliance on external stimuli and limitations to wetting liquids.
  • Existing methods often require specific tube elasticity and surface modifications for different liquid types.

Purpose of the Study:

  • To develop a versatile system for controllable droplet transportation applicable to a wide range of liquids.
  • To overcome the limitations of existing methods by combining shape memory effects and superhydrophobic surfaces.

Main Methods:

  • Fabrication of a shape memory polymer (SMP) tube with a Nepenthes pitcher plant-inspired slippery surface.
  • Utilizing the shape memory effect (SME) of the SMP for tunable tube shape and liquid manipulation.
Keywords:
droplet transportationshape memory polymershape regulationslippery tubesmart control

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  • Investigating the transportation of various liquids, including water and oils with different surface tensions.

    • Main Results:

    • Demonstrated smart control over droplet transportation speed and direction.
    • Achieved diverse transportation modes: round-trip, segmented, and antigravity.
    • Successfully applied the system for batch inspection of droplets and controlled microreactions.

    Conclusions:

    • The developed SMP tube with a slippery surface offers a novel strategy for smart liquid transportation.
    • This approach expands the applicability to diverse liquids and enables advanced manipulation capabilities.
    • Presents new ideas for designing superwetting materials for advanced microfluidic applications.