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A Semi-quantitative Approach to Assess Biofilm Formation Using Wrinkled Colony Development
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First curl, then wrinkle.

Ana C Trindade1, João P Canejo, Paulo I C Teixeira

  • 1Departamento de Ciência dos Materiais and CENIMAT/I3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal.

Macromolecular Rapid Communications
|August 21, 2013
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Summary
This summary is machine-generated.

Researchers exploit elastomer properties to create wrinkling instabilities in micro- and nano-fibers. A simple model predicts curling and wrinkling behaviors, inspired by plant tendrils.

Keywords:
Janus fibreselastic instabilitieselastomerselectrospinning

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Area of Science:

  • Materials Science
  • Mechanics of Materials
  • Soft Matter Physics

Background:

  • Elastomers exhibit unique properties exploited for advanced material design.
  • Wrinkling instabilities are a common phenomenon in curved structures under stress.
  • Bio-inspired designs often leverage natural mechanisms for novel functionalities.

Purpose of the Study:

  • To investigate the wrinkling instabilities in micro- and nano-fibers made from elastomers.
  • To develop an analytical model for predicting the curling and wrinkling behavior of these fibers.
  • To understand the transition between curling and wrinkling regimes.

Main Methods:

  • Fabrication of micro- and nano-fibers using electrospinning and UV irradiation.
  • Controlled solvent de-swelling to induce structural changes.
  • Development of a simple analytical model to describe the observed phenomena.

Main Results:

  • Fibers composed of a soft core and stiff outer half-shell were successfully produced.
  • Solvent de-swelling caused fibers to curl due to differential natural lengths.
  • Wrinkling instability initiated only after the fiber achieved a helical shape.
  • The analytical model accurately predicted curling curvature, wrinkle wavelength, and regime transitions.

Conclusions:

  • The study successfully demonstrates the controlled induction of wrinkling instabilities in elastomer-based micro- and nano-fibers.
  • A novel analytical model provides insights into the mechanics of curling and wrinkling in these structures.
  • The findings offer a bio-inspired approach for designing materials with tunable surface topographies and mechanical responses.