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Related Concept Videos

Biofilms01:29

Biofilms

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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Bridging the Bio-Electronic Interface with Biofabrication
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Living Bioelectrochemical Composites.

Samantha R McCuskey1,2, Yude Su3,2,4, Dirk Leifert2

  • 1Department of Chemical Engineering, University of California, Santa Barbara, California, 93106, USA.

Advanced Materials (Deerfield Beach, Fla.)
|April 30, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel bioelectronic composite using conductive polymers and electroactive bacteria (Shewanella oneidensis MR-1) to enhance microbial fuel cell performance. This innovation significantly boosts biocurrent output and efficiency for sustainable energy and chemical production.

Keywords:
bioelectrochemical systemsbiofilm formationconductive polymersexoelectrogenliving materials

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Area of Science:

  • Bioelectronics
  • Materials Science
  • Microbiology

Background:

  • Composites combine materials for enhanced properties, but few incorporate living microbes.
  • Certain microorganisms facilitate electron transfer to external surfaces, forming a basis for bioelectronic applications.
  • Bioelectronic composites can advance bioelectrochemical technologies like microbial fuel cells and bioelectrosynthesis.

Purpose of the Study:

  • To create a bioelectronic composite using a conductive polymer matrix and electroactive bacteria.
  • To investigate the impact of this composite on biocurrent generation and electron transport.
  • To assess the synergistic effects between the bacteria and the conductive polymer.

Main Methods:

  • Utilized conjugated polyelectrolyte CPE-K as a conductive matrix.
  • Integrated Shewanella oneidensis MR-1 (a model electroactive bacterium) within the matrix.
  • Assembled biocomposites spontaneously from solution onto a gold electrode.
  • Measured biocurrent and charge transfer resistance.

Main Results:

  • The biocomposite increased biocurrent by approximately 150-fold compared to control biofilms.
  • Enhanced biocurrent resulted from increased cell communication with the electrode and improved per-cell current extraction.
  • Biocomposites exhibited significantly lower charge transfer resistance than the conductive polymer alone.
  • Demonstrated efficient long-range electron transport within the composite structure.

Conclusions:

  • The developed bioelectronic composite effectively connects a three-dimensional bacterial network to an electrode.
  • Synergistic interaction between electroactive bacteria and the conductive polymer enhances bioelectronic performance.
  • This approach offers a promising strategy for advancing microbial fuel cells and bioelectrosynthesis platforms.