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Updated: Jun 8, 2026

Capillary Electrophoresis to Monitor Peptide Grafting onto Chitosan Films in Real Time
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Published on: October 26, 2016

pH-Responsive chitosan-mediated graphene dispersions.

Ming Fang1, Jiang Long, Weifeng Zhao

  • 1Institute of Polymer & Nanomaterials, Huaqiao University, 269 Chenghuabei Road, Quanzhou City, Fujian Province, 362021, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 13, 2010
PubMed
Summary

Researchers created stable graphene suspensions using chitosan. These suspensions can be reversibly switched between dispersed and aggregated states by adjusting the pH, offering new possibilities for graphene applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomaterials

Background:

  • Graphene oxide (GO) is a precursor to graphene, but its aggregation in aqueous solutions limits applications.
  • Chitosan is a biocompatible polysaccharide with tunable properties.
  • Controlling graphene's dispersion state is crucial for its use in various fields.

Purpose of the Study:

  • To develop a method for preparing stable, homogeneous aqueous graphene suspensions.
  • To investigate the pH-responsive behavior of graphene in the presence of chitosan.
  • To explore the potential of chitosan-stabilized graphene for controlled assembly.

Main Methods:

  • Chemical reduction of graphene oxide in the presence of chitosan.
  • Characterization of graphene suspensions using spectroscopic and microscopic techniques.

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  • pH-dependent stability and aggregation studies.

    • Main Results:

    • Stable, homogeneous aqueous suspensions of graphene were successfully prepared.
    • The graphene sheets exhibited reversible switching between dispersed and aggregated states.
    • pH was identified as an effective stimulus to control the aggregation state.

    Conclusions:

    • Chitosan acts as an effective stabilizer for graphene in aqueous media.
    • The pH-responsive nature of these suspensions allows for controlled graphene assembly.
    • This work provides a foundation for developing novel graphene-based materials and devices.