3 years ago

Nanostructured Biopolymer/Few-Layer Graphene Freestanding Films with Enhanced Mechanical and Electrical Properties

Nanostructured Biopolymer/Few-Layer Graphene Freestanding Films with Enhanced Mechanical and Electrical Properties
Sofia G. Caridade, Cláudia Silva, Maria P. Sousa, João F. Mano, Helena Rocha, Maria C. Paiva, Eunice Cunha, Natália M. Alves
In the present work, novel freestanding multilayered films based on chitosan (CHI), alginate (ALG), and functionalized few-layer graphene are developed through layer-by-layer assembly. First, functionalized few-layer graphene aqueous suspensions are prepared from graphite by a stabilizer-assisted liquid phase exfoliation process, using a pyrene derivative as stabilizer. Afterward, the films are produced and their physical, morphological, thermal, and mechanical properties are evaluated. Furthermore, their degradation and swelling profiles, as well as their biological behavior, are assessed. The incorporation of functionalized few-layer graphene results in films with a nanolayered structure, lower roughness than the control CHI/ALG films, and hydrophilic behavior. The mechanical characterization reveals an increase of the Young's modulus, ultimate tensile strength, and elongation at break due to the incorporation of the graphene derivative. A decrease in the electrical resistivity of the multilayered films is also observed. The biological assays reveal improved cytocompatibility toward L929 cells when functionalized few-layer graphene is incorporated in the CHI/ALG matrix. Therefore, these new graphene-reinforced multilayered films exhibit interesting properties and great potential for biomedical applications, particularly in wound healing and cardiac and bone tissue engineering. Novel freestanding multilayered films based on chitosan, alginate, and functionalized few-layer graphene are developed through layer-by-layer assembly. Graphene aqueous suspensions are prepared from graphite by stabilizer-assisted liquid phase exfoliation. An enhancement of the mechanical properties, a decrease in the electrical resistivity, and improved cytocompatibility due to graphene incorporation are found. These new films exhibit great potential for distinct biomedical applications.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/mame.201700316

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.