Rapidly tunable and highly reversible bio-inspired dry adhesion for transfer printing in air and a vacuum

Soft Matter ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 30-37 ◽  
Author(s):  
Changhong Linghu ◽  
Chengjun Wang ◽  
Nuo Cen ◽  
Jiaming Wu ◽  
Zhengfeng Lai ◽  
...  
Keyword(s):  
Transfer Printing ◽  
Magnetically Actuated ◽  
Dry Adhesion

Magnetically actuated aphid-inspired dry adhesion is developed with rapid tunability and high reversibility and demonstrated in transfer printing both in air and in a vacuum.

scholarly journals Soft nanocomposite electroadhesives for digital micro- and nanotransfer printing

2019 ◽  
Vol 5 (10) ◽  
pp. eaax4790 ◽  
Author(s):  
Sanha Kim ◽  
Yijie Jiang ◽  
Kiera L. Thompson Towell ◽  
Michael S. H. Boutilier ◽  
Nigamaa Nayakanti ◽  
...  
Keyword(s):  
Surface Forces ◽  
Electronic Systems ◽  
Transfer Printing ◽  
Dielectric Thickness ◽  
Light Emitting ◽  
Dry Adhesion ◽  
Pick And Place ◽  
Ag Nanowires ◽  
Automated Handling ◽  
Coated Carbon

Automated handling of microscale objects is essential for manufacturing of next-generation electronic systems. Yet, mechanical pick-and-place technologies cannot manipulate smaller objects whose surface forces dominate over gravity, and emerging microtransfer printing methods require multidirectional motion, heating, and/or chemical bonding to switch adhesion. We introduce soft nanocomposite electroadhesives (SNEs), comprising sparse forests of dielectric-coated carbon nanotubes (CNTs), which have electrostatically switchable dry adhesion. SNEs exhibit 40-fold lower nominal dry adhesion than typical solids, yet their adhesion is increased >100-fold by applying 30 V to the CNTs. We characterize the scaling of adhesion with surface morphology, dielectric thickness, and applied voltage and demonstrate digital transfer printing of films of Ag nanowires, polymer and metal microparticles, and unpackaged light-emitting diodes.

Skin and dry adhesion

2018 ◽  
Author(s):  
Changhyun Pang ◽  
Chanseok Lee ◽  
Hoon Eui Jeong ◽  
Kahp-Yang Suh
Keyword(s):  
Material Properties ◽  
Structural Features ◽  
Mechanical Interlocking ◽  
Multi Scale ◽  
Skin Patch ◽  
Reversible Adhesion ◽  
Dry Adhesion ◽  
Close Observation ◽  
Dry Adhesives ◽  
Shed Light

Close observation of various attachment systems in animal skins has revealed various exquisite multi-scale architectures for essential functions such as locomotion, crawling, mating, and protection from predators. Some of these adhesion systems of geckos and beetles have unique structural features (e.g. high-aspect ratio, tilted angle, and hierarchical nanostructure), resulting in mechanical interlocking mediated by van der Waals forces or liquid secretion (capillary force). In this chapter, we present an overview of recent advances in bio-inspired, artificial dry adhesives, and biomimetics in the context of nanofabrication and material properties. In addition, relevant bio-inspired structural materials, devices (clean transportation device, interlocker, biomedical skin patch, and flexible strain-gauge sensor) and microrobots are briefly introduced, which would shed light on future smart, directional, and reversible adhesion systems.

scholarly journals Harnessing reversible dry adhesion using shape memory polymer microparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (32) ◽  
pp. 19616-19622
Author(s):  
Wenbing Li ◽  
Junhao Liu ◽  
Wanting Wei ◽  
Kun Qian
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Memory Effects ◽  
Reversible Adhesion ◽  
Dry Adhesion ◽  
Bonding Property ◽  
Shape Memory Effects ◽  
Polymer Microparticles

Shape memory polymers can provide excellent bonding property because of their shape memory effects. This paper proposes an adhesive unit that is capable of repeatable smart adhesion and exhibits reversible adhesion under heating.

scholarly journals Investigation of Thick-Film-Paste Rheology and Film Material for Pattern Transfer Printing (PTP) Technology

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 108
Author(s):  
Adrian Adrian ◽  
Dominik Rudolph ◽  
Jan Lossen ◽  
Norbert Willenbacher
Keyword(s):  
Solar Cell ◽  
Aspect Ratio ◽  
Yield Stress ◽  
Laser Power ◽  
Light Transmission ◽  
Pattern Transfer ◽  
Volatile Components ◽  
Film Material ◽  
Transfer Printing ◽  
Power Threshold

Steady cost pressure in silicon solar cell production leads to a continuous reduction of silver consumption per cell. Pattern Transfer Printing (PTP) technology enables to reduce silver consumption by depositing smaller front electrodes on solar cells. Here, we aim at a better understanding of the laser deposition process. The aspect ratio of printed lines improved with increasing paste yield stress but was lower than the theoretical aspect ratio for a given trench geometry, suggesting that line spreading was caused by the pressure that was due to the vaporization of volatile paste components and a yield stress reduction that was due to local paste heating. A low laser power threshold, mandatory to fabricate narrow electrodes with a high aspect ratio and low amount of debris, could be achieved using pastes with low boiling temperature of volatile components and poor wetting between paste and film. The material with the lowest light transmission exhibited the lowest laser power threshold. We attribute this to the weaker adhesion to the paste and a better alignment with the laser focal plane. Our results provide valuable guidelines for paste and film material design aimed at narrower electrodes, with a higher aspect ratio to be obtained at an even lower laser power threshold in PTP-based solar cell metallization.

An Optically Aided Magnetic Tracking Approach for Magnetically Actuated Capsule Robot

2021 ◽  
Vol 70 ◽  
pp. 1-9
Author(s):  
Qinyuan Shi ◽  
Tangyou Liu ◽  
Shuang Song ◽  
Jiaole Wang ◽  
Max Q.-H. Meng
Keyword(s):  
Magnetic Tracking ◽  
Magnetically Actuated ◽  
Capsule Robot
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