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Temperature-triggered shape-transformations in layer-by-layer microtubes.

Choonghyun Sung1, Ajay Vidyasagar, Katelin Hearn

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, USA. jodie.lutkenhaus@tamu.edu.

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|April 9, 2020
PubMed
Summary

Poly(allylamine hydrochloride)/poly(acrylic acid) microtubes undergo shape transformations triggered by temperature. Released microtubes form ellipsoids, while confined microtubes develop perforations near their glass transition temperature.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Layer-by-layer (LbL) nano- and microtubes are versatile structures with applications in energy and biomedicine.
  • Understanding the stimuli-responsive behavior of LbL materials is crucial for designing advanced functional devices.

Purpose of the Study:

  • To investigate the temperature-triggered shape transformation of poly(allylamine hydrochloride)/poly(acrylic acid) (PAH/PAA) microtubes.
  • To correlate shape changes with the thermal properties of the LbL assembly.

Main Methods:

  • Assembly of PAH/PAA microtubes onto porous sacrificial templates.
  • Observation of shape changes upon heating released and confined microtubes in water.
  • Analysis of transformations in relation to the glass transition temperature (Tg) of the hydrated LbL assembly.

Main Results:

  • Released PAH/PAA microtubes transform into closed ellipsoids when heated in water.
  • Unreleased PAH/PAA microtubes confined within templates exhibit periodic perforations upon heating.
  • Both shape transformations occur near and above the glass transition temperature (Tg) of the hydrated PAH/PAA assembly.

Conclusions:

  • The shape transformation of PAH/PAA microtubes is directly linked to their thermal properties, specifically the glass transition temperature.
  • Confined vs. released conditions significantly influence the mode of temperature-induced shape change.
  • This study highlights the potential for controlled shape morphing in LbL assemblies for tunable applications.