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Sliding Mechanism for Release of Superlight Objects from Micropatterned Adhesives

  • Robotic handling and transfer printing of micrometer-sized superlight objects is a crucial technology in industrial fabrication. In contrast to the precise gripping with micropatterned adhesives, the reliable release of superlight objects with negligible weight is a great challenge. Slanted deformable polymer microstructures, with typical pillar cross-section 150 µm × 50 µm, are introduced with various tilt angles that enable a reduction of adhesion by a switching ratio of up to 500. The experiments demonstrate that the release from a smooth surface involves sliding of the contact during compression and subsequent peeling of the object during retraction. The handling of a 0.5 mg perfluorinated polymer micro-object with high accuracy in repeated pick-and-place cycles is demonstrated. Based on beam theory, the forces and moments acting at the tip of the microstructure are analyzed. As a result, an expression for the pull-off force is proposed as a function of the sliding distance and a guide to an optimized design for these release structures is provided.

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Document Type:Article
Author:Yue WangORCiD, Xuan ZhangORCiD, René HenselORCiD, Eduard ArztORCiD
Parent Title (English):Advanced Materials Interfaces
First Page:2101764
Year of first Publication:2022
Release Date:2022/05/25
Tag:bioinspiration; microhandling; micropatterned adhesives; release of superlight objects; two‐photon lithography
Impact:06.389 (2021)
Funding Information:Leibniz Competition Grant MUSIGAND (No. K279/2019)
Groups:Funktionelle Mikrostrukturen
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 600 Technik
Open Access:Open Access
Signature:INM 2022/014
Licence (German):License LogoCreative Commons - CC BY-NC - Namensnennung - Nicht kommerziell 4.0 International