Reversible and variable dry adhesion is a promising approach for versatile robotic grasping. Variable stiffness materials with a modulus that can be tuned using an external stimulus offer a unique approach to realize dynamic control of adhesion. In this study, an unstructured shape memory polymer (SMP) membrane with variable stiffness is used to pick-and-place three-dimensional objects. The variable stiffness of the SMP allows the membrane to conform to and make good contact with objects of various shapes in its soft state and then achieve high adhesive load capacity by switching to the stiff state. Release of objects is realized by switching to the soft state. The ratio between the high-adhesion and low-adhesion state is demonstrated to be >2000 on a curved substrate and ∼115 on a flat substrate. This gripper exhibits no adhesion in the unactivated state and maintains adhesion passively once actuation is complete.
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References
1.
HenselR, MohK, ArztE. Engineering micropatterned dry adhesives: from contact theory to handling applications. Adv Funct Mater, 2018; 28:1800865.
2.
Del CampoA, GreinerC, ÁlvarezI, et al.Patterned surfaces with pillars with controlled 3D tip geometry mimicking bioattachment devices. Adv Mater, 2007; 19:1973–1977.
XueL, SanzB, LuoA, et al.Hybrid surface patterns mimicking the design of the adhesive toe pad of tree frog. ACS Nano, 2017; 11:9711–9719.
5.
HawkesEW, ChristensenDL, HanAK, et al.Grasping without squeezing: shear adhesion gripper with fibrillar thin film. Proc IEEE Int Conf Robot Autom, 2015; 2015:2305–2312.
6.
SongS, SittiM. Soft grippers using micro-fibrillar adhesives for transfer printing. Adv Mater, 2014; 26:4901–4906.
7.
SongS, Drotlef DiM, MajidiC, et al.Controllable load sharing for soft adhesive interfaces on three-dimensional surfaces. Proc Natl Acad Sci U S A, 2017; 114:E4344–E4353.
8.
MinskyHK, TurnerKT. Achieving enhanced and tunable adhesion via composite posts. Appl Phys Lett, 2015; 106:201604.
9.
BartlettMD, CrollAB, KingDR, et al.Looking beyond fibrillar features to scale gecko-like adhesion. Adv Mater, 2012; 24:1078–1083.
10.
LuoA, Mohammadi NasabA, TatariM, et al.Adhesion of flat-ended pillars with non-circular contacts. Soft Matter, 2020; 16:9534–9542.
11.
KendallK. An adhesion paradox. J Adhesion, 1973; 5:77–79.
12.
EisenhaureJ, KimS. High-strain shape memory polymers as practical dry adhesives. Int J Adhes Adhes, 2018; 81:74–78.
13.
YeZ, LumGZ, SongS, et al.Phase change of gallium enables highly reversible and switchable adhesion. Adv Mater, 2016; 28:5088–5092.
14.
ChoH, WuG, JollyJC, et al.Intrinsically reversible superglues via shape adaptation inspired by snail epiphragm. Proc Natl Acad Sci U S A, 2019; 116:13774–13779.
MiaoW, ZouW, JinB, et al.On demand shape memory polymer via light regulated topological defects in a dynamic covalent network. Nat Commun, 2020; 11:4257.
17.
LendleinA, JiangH, JüngerO, et al.Light-induced shape-memory polymers. Nature, 2005; 434:879–882.
18.
EisenhaureJD, XieT, VargheseS, et al.Microstructured shape memory polymer surfaces with reversible dry adhesion. ACS Appl Mater Interfaces, 2013; 5:7714–7717.
19.
LinghuC, ZhangS, WangC, et al.Universal SMP gripper with massive and selective capabilities for multiscaled, arbitrarily shaped objects. Sci Adv, 2020; 6:1–12.
20.
SeoJ, EisenhaureJ, KimS. Micro-wedge array surface of a shape memory polymer as a reversible dry adhesive. Extreme Mech Lett, 2016; 9:207–214.
21.
EisenhaureJD, Rhee S Il, Al-OkailyAM, et al.The use of shape memory polymers for MEMS assembly. J Microelectromech Syst, 2016; 25:69–77.
22.
HuangY, ZhengN, ChengZ, et al.Direct laser writing-based programmable transfer printing via bioinspired shape memory reversible adhesive. ACS Appl Mater Interfaces, 2016; 8:35628–35633.
23.
TanD, WangX, LiuQ, et al.Switchable adhesion of micropillar adhesive on rough surfaces. Small, 2019; 15:1904248.
24.
KimS, SittiM, XieT, et al.Reversible dry micro-fibrillar adhesives with thermally controllable adhesion. Soft Matter, 2009; 5:3689–3693.
25.
BrownE, RodenbergN, AmendJ, et al.Universal robotic gripper based on the jamming of granular material. Proc Natl Acad Sci U S A, 2010; 107:18809–18814.
26.
LiL, LiuZ, ZhouM, et al.Flexible adhesion control by modulating backing stiffness based on jamming of granular materials. Smart Mater Struct, 2019; 28:115023.
27.
SwiftMD, HaverkampCB, StabileCJ, et al.Active membranes on rigidity tunable foundations for programmable, rapidly switchable adhesion. Adv Mater Technol, 2020; 5:2000676.
28.
KrahnJ, SameotoD, MenonC. Controllable biomimetic adhesion using embedded phase change material. Smart Mater Struct, 2011; 20:1–8.
29.
TatariM, Mohammadi NasabA, TurnerKT, et al.Dynamically tunable dry adhesion via subsurface stiffness modulation. Adv Mater Interfaces, 2018; 5:1800321.
30.
CoulsonR, StabileCJ, TurnerKT, et al.Versatile soft robot gripper enabled by stiffness and adhesion tuning via thermoplastic composite. Soft Robot, 2021; 00:1–12.
31.
KimDH, LuN, MaR, et al.Epidermal electronics. Science, 2011; 333:838–843.
32.
PengZ, ChenS. Peeling behavior of a thin-film on a corrugated surface. Int J Solids Struct, 2015; 60:60–65.
33.
ArulEP, GhatakA. Control of adhesion via internally pressurized subsurface microchannels. Langmuir, 2012; 28:4339–4345.
34.
SongS, MajidiC, SittiM. GeckoGripper: a soft, inflatable robotic gripper using gecko-inspired elastomer micro-fiber adhesives. IEEE Int Conf Intell Robots Syst, 2014; 4624–4629.
35.
SongS, DrotlefDM, PaikJ, et al.Mechanics of a pressure-controlled adhesive membrane for soft robotic gripping on curved surfaces. Extreme Mech Lett, 2019; 30:100485.
36.
PerssonBNJ, ScaraggiM. Theory of adhesion: role of surface roughness. J Chem Phys, 2014; 141:124701.
CarlsonA, WangS, ElvikisP, et al.Active, programmable elastomeric surfaces with tunable adhesion for deterministic assembly by transfer printing. Adv Funct Mater, 2012; 22:4476–4484.
39.
ZhaoR, LinS, YukH, et al.Kirigami enhances film adhesion. Soft Matter, 2018; 14:2515–2525.
40.
MarkvickaEJ, BartlettMD, HuangX, et al.An autonomously electrically self-healing liquid metal-elastomer composite for robust soft-matter robotics and electronics. Nat Mater, 2018; 17:618–624.
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