Adhesion Study of Complementary Rough Surfaces of the PDMS Elastomer.

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.