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Preparation of DNA-crosslinked Polyacrylamide Hydrogels

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Published on: August 27, 2014

A smart pH responsive graphene/polyacrylamide complex via noncovalent interaction.

Lulu Ren¹, Tianxi Liu, Juan Guo

¹Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Fudan University, 220 Handan Road, Shanghai 200433, People's Republic of China.

|July 27, 2010

Summary

Graphene sheets stably disperse in water using polyacrylamide via hydrophobic interactions. The resulting graphene-polyacrylamide complexes exhibit reversible pH responsiveness, enabling new applications in sensors and medicine.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Graphene's unique properties are hindered by poor water dispersibility.
Developing stable aqueous graphene dispersions is crucial for broader applications.

Purpose of the Study:

To achieve stable aqueous dispersion of graphene sheets.
To impart pH-responsive properties to graphene-polyacrylamide complexes.
To explore novel applications for functionalized graphene.

Main Methods:

Utilizing hydrophobic interactions between graphene sheets and polyacrylamide for stable dispersion.
Characterizing the properties of the resultant graphene-polyacrylamide complexes.
Investigating the pH-responsive behavior of the complexes.

Main Results:

Graphene sheets were stably dispersed in water through interaction with polyacrylamide.
The graphene-polyacrylamide complexes demonstrated reversible pH-responsive behavior.
This functionalization was achieved without inherent pH sensitivity of polyacrylamide.

Conclusions:

A novel method for stable, pH-responsive graphene dispersion in water was developed.
This technique enhances graphene's utility in intelligent sensors, biology, medicine, and nanoelectronics.
The findings open avenues for advanced material design and applications.