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Adhesion Study of Complementary Rough Surfaces of the PDMS Elastomer.

Susheel Kumar1, Krishnacharya Khare2, Manjesh Kumar Singh1

  • 1Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary

Surface roughness impacts polydimethylsiloxane (PDMS) elastomer adhesion in a non-monotonic way. This study reveals key relationships between roughness, contact area, and adhesion work for applications like triboelectric nanogenerators.

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Area of Science:

  • Materials Science
  • Surface Science
  • Tribology

Background:

  • Adhesion of soft elastomers like polydimethylsiloxane (PDMS) is vital for microfluidics, soft robotics, and electronic sensors.
  • Factors influencing adhesion include surface energy, mechanical properties, and surface texture.
  • Understanding surface roughness effects is crucial for optimizing elastomer-based devices.

Purpose of the Study:

  • To investigate the specific influence of surface roughness on the adhesion behavior of PDMS elastomers.
  • To analyze the relationship between surface roughness, work of adhesion, and crack length at a complementary interface.
  • To explore correlations between real contact area, dimensionless scan length, and work of adhesion.

Main Methods:

  • PDMS elastomer surfaces were textured using sandpapers with grit sizes from N=120 to N=2000.
  • Surface roughness was quantified using a stylus profilometer.
  • Interfacial adhesion was measured via wedge test experiments.

Main Results:

  • A non-monotonic relationship was observed between surface roughness and adhesion.
  • The study established correlations between real contact area and work of adhesion.
  • A link was found between dimensionless scan length and work of adhesion.

Conclusions:

  • Surface roughness significantly influences PDMS elastomer adhesion in a complex manner.
  • The findings provide critical insights for designing and developing advanced triboelectric nanogenerators.
  • Optimizing surface texture is key for enhancing adhesion performance in elastomer applications.