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A Shape-Memory DNA-Based Hydrogel Exhibiting Two Internal Memories.

Yuwei Hu1, Weiwei Guo1, Jason S Kahn1

  • 1Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.

Angewandte Chemie (International Ed. in English)
|February 27, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel shape-memory hydrogel with two internal memories, utilizing acrylamide and DNA. Reversible pH changes allow the hydrogel to switch between shaped and shapeless states, forming distinct structures.

Keywords:
DNAgelsnanostructurespolymersshape-memory materials

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Hydrogels are versatile materials with applications in various fields.
  • Developing stimuli-responsive hydrogels with tunable properties is an active area of research.
  • Shape-memory materials offer unique functionalities for advanced applications.

Purpose of the Study:

  • To synthesize a novel acrylamide-DNA hydrogel exhibiting shape-memory properties.
  • To incorporate two distinct internal memories within the hydrogel structure.
  • To achieve pH-controlled reversible switching between shaped and shapeless states.

Main Methods:

  • Synthesis of an acrylamide-DNA hydrogel crosslinked with two types of pH-responsive oligonucleotide units.
  • Utilizing T-A·T and C-G·C(+) triplex DNA structures for crosslinking.
  • Employing reversible pH triggering (pH 5.0, 7.0, and 10.0) to control hydrogel state.

Main Results:

  • Successful synthesis of a dual-memory shape-memory hydrogel.
  • Demonstration of hydrogel dissociation into a quasi-liquid state at pH 10.0 and pH 5.0, retaining one internal memory.
  • Reversible cycling between shaped hydrogel and shapeless states via pH manipulation.
  • Formation of two distinct hydrogel structures controlled by pH-dictated memories.

Conclusions:

  • The developed acrylamide-DNA hydrogel possesses dual internal memories enabling precise shape control.
  • pH-responsive DNA crosslinkers provide a mechanism for reversible hydrogel state transitions.
  • This material offers potential for applications requiring programmable shape changes and stimuli-responsive behavior.