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Related Experiment Video

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Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release
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Magnetically aligned supramolecular hydrogels.

Matthew Wallace1, Andre Zamith Cardoso, William J Frith

  • 1Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD (UK).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 28, 2014
PubMed
Summary
This summary is machine-generated.

Magnetic fields align dipeptide gelator structures in solution, retaining alignment in hydrogels. This method precisely controls anisotropy, expanding low-molecular-weight gelator applications.

Keywords:
NMR spectroscopyalignmenthydrogelpeptideself-assembly

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry

Background:

  • Dipeptide gelators form fibrillar structures in aqueous solutions.
  • Controlling anisotropy in hydrogels is challenging with conventional methods.

Purpose of the Study:

  • To report magnetic-field-induced alignment of dipeptide gelator structures.
  • To demonstrate retention of alignment in hydrogels.
  • To explore precise control over hydrogel anisotropy.

Main Methods:

  • Utilizing a switchable magnetic field for alignment.
  • Inducing hydrogel formation via CaCl2 addition or pH reduction.
  • Employing slow diffusion of CaCl2 for controlled anisotropy.

Main Results:

  • Achieved magnetic-field-induced alignment of dipeptide fibrillar structures.
  • Demonstrated retention of alignment in hydrogels formed with CaCl2 or reduced pH.
  • Precisely controlled the extent of anisotropy across the hydrogel.

Conclusions:

  • Magnetic field alignment is a viable method for controlling hydrogel anisotropy.
  • This technique is extendable to other compounds forming viscous solutions at high pH.
  • The approach is expected to enhance the utility of low-molecular-weight gelators (LMWG) where alignment is critical.