Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 24, Pages 27717-27725Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05367
Keywords
dry adhesives; switchable adhesion; subsurface pressure modulation; finite element analysis; mechanics modeling
Funding
- NSF [1830388, 1663037, 1830475]
- Syracuse University
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1830475, 1663037] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1830388] Funding Source: National Science Foundation
Ask authors/readers for more resources
Materials and devices with tunable dry adhesion have many applications, including transfer printing, climbing robots, and gripping in pick-and-place processes. In this paper, a novel soft device to achieve dynamically tunable dry adhesion via modulation of subsurface pneumatic pressure is introduced. Specifically, a cylindrical elastomer pillar with a mushroom-shaped cap and annular chamber that can be pressurized to tune the adhesion is investigated. Finite element-based mechanics models and experiments are used to design, understand, and demonstrate the adhesion of the device. Specifically, the device is designed using mechanics modeling such that the pressure applied inside the annular chamber significantly alters the stress distribution at the adhered interface and thus changes the effective adhesion strength. Devices made of polydimethylsiloxane (PDMS) with different elastic moduli were tested against glass, silicon, and aluminum substrates. Adhesion strengths (sigma(0)) ranging from similar to 37 kPa (between PDMS and glass) to similar to 67 kPa (between PDMS and polished aluminum) are achieved for the nonpressurized state. For all cases, regardless of the material and roughness of the substrates, the adhesion strength dropped to 40% of the strength of the nonpressurized state (equivalent to a 2.5X adhesion switching ratio) by increasing the chamber pressure from 0.3 sigma(0) to 0.6 sigma(0). Furthermore, the strength drops to 20% of the unpressurized strength (equivalent to a 5X adhesion switching ratio) when the chamber pressure is increased to sigma(0).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available