Swaying gel: chemo-mechanical self-oscillation based on dynamic buckling

Summary Self-oscillating systems are powerful tools for transducing static energy inputs into repetitive motions without the aid of external control units. The challenge in sustaining the far-from-equilibrium motion of an oscillating material is to avoid the tendency of reaching thermodynamic equilibrium or get pinned at steady states in the dynamic process. While living organisms present elegant strategies in myriad self-oscillations (e.g., peristalsis, cilia motion, homeostasis), current synthetic self-oscillating systems often rely on a fast actuation/reaction, to maintain the far-from-equilibrium motion, which prescribe highly specific chemical reactions and a material microstructure with limited stimuli and movement modes. Here, we present a dynamic buckling-based design for creating self-oscillating systems. The oscillation arises from the self-driven snap-through of a responsive hydrogel between bi-/multi-stable buckling configurations governed by a feedback loop. With broad choices of materials, tunable mechanics, and physical simplicity, this system opens a new venue for unlimited autonomous-oscillating materials applications.

[1]  Zhigang Suo,et al.  Digital logic for soft devices , 2019, Proceedings of the National Academy of Sciences.

[2]  Ximin He,et al.  Synthetic homeostatic materials with chemo-mechano-chemical self-regulation , 2012, Nature.

[3]  K. Bertoldi,et al.  Complex ordered patterns in mechanical instability induced geometrically frustrated triangular cellular structures. , 2014, Physical review letters.

[4]  George M. Whitesides,et al.  A soft, bistable valve for autonomous control of soft actuators , 2018, Science Robotics.

[5]  Laurent Pilon,et al.  Artificial phototropism for omnidirectional tracking and harvesting of light , 2019, Nature Nanotechnology.

[6]  Yusen Zhao,et al.  Soft phototactic swimmer based on self-sustained hydrogel oscillator , 2019, Science Robotics.

[7]  Joanna Aizenberg,et al.  Chemo-Mechanically Regulated Oscillation of an Enzymatic Reaction , 2013 .

[8]  Vladimir K. Vanag,et al.  Inwardly Rotating Spiral Waves in a Reaction-Diffusion System , 2001, Science.

[9]  R. Yoshida,et al.  Self-Oscillating Gel , 1996 .

[10]  Irene Elices,et al.  Robust dynamical invariants in sequential neural activity , 2018, Scientific Reports.

[11]  B. Audoly,et al.  A nonlinear beam model of photomotile structures , 2020, Proceedings of the National Academy of Sciences.

[12]  Robert J. Wood,et al.  An integrated design and fabrication strategy for entirely soft, autonomous robots , 2016, Nature.

[13]  Katia Bertoldi,et al.  Buckling‐Induced Reversible Symmetry Breaking and Amplification of Chirality Using Supported Cellular Structures , 2013, Advanced materials.

[14]  Katia Bertoldi,et al.  Kirigami skins make a simple soft actuator crawl , 2018, Science Robotics.

[15]  Joost Groen,et al.  Rational design of functional and tunable oscillating enzymatic networks. , 2015, Nature chemistry.

[16]  A. Balazs,et al.  Pattern Formation and Shape Changes in Self-Oscillating Polymer Gels , 2006, Science.

[17]  George M. Whitesides,et al.  Autocatalytic, bistable, oscillatory networks of biologically relevant organic reactions , 2016, Nature.

[18]  T. White,et al.  Programmable and adaptive mechanics with liquid crystal polymer networks and elastomers. , 2015, Nature materials.

[19]  Yuejin Wu,et al.  Correction: Corrigendum: The mitochondrial uniporter controls fight or flight heart rate increases , 2015, Nature Communications.

[20]  E. W. Meijer,et al.  Making waves in a photoactive polymer film , 2017, Nature.

[21]  Zhenghan Gao,et al.  Scaling up nanoscale water-driven energy conversion into evaporation-driven engines and generators , 2015, Nature Communications.

[22]  Ryo Yoshida,et al.  Recent Advances in Self-Oscillating Polymer Material Systems. , 2016, Chemical record.

[23]  Jizhou Song,et al.  Buckling of thin gel strip under swelling , 2017 .

[24]  E. W. Meijer,et al.  Mastering the Photothermal Effect in Liquid Crystal Networks: A General Approach for Self‐Sustained Mechanical Oscillators , 2017, Advanced materials.

[25]  Ryo Yoshida,et al.  Self‐Oscillating Gels Driven by the Belousov–Zhabotinsky Reaction as Novel Smart Materials , 2010, Advanced materials.

[26]  I. Epstein,et al.  Retrograde and Direct Wave Locomotion in a Photosensitive Self-Oscillating Gel. , 2016, Angewandte Chemie.

[27]  Dirk J. Broer,et al.  A chaotic self-oscillating sunlight-driven polymer actuator , 2016, Nature Communications.

[28]  Ryo Yoshida,et al.  Recent developments in self-oscillating polymeric systems as smart materials: from polymers to bulk hydrogels , 2017 .

[29]  Katia Bertoldi,et al.  Programming soft robots with flexible mechanical metamaterials , 2019, Science Robotics.

[30]  Valery Petrov,et al.  Controlling chaos in the Belousov—Zhabotinsky reaction , 1993, Nature.

[31]  Corentin Coulais,et al.  Multi-step self-guided pathways for shape-changing metamaterials , 2018, Nature.

[32]  R. Yoshida,et al.  Self‐Walking Gel , 2007 .

[33]  Fan Cui,et al.  Understanding the Capability of an Ecosystem Nature-Restoration in Coal Mined Area , 2019, Scientific Reports.

[34]  Masuki Kawamoto,et al.  An autonomous actuator driven by fluctuations in ambient humidity. , 2016, Nature materials.

[35]  Shuji Hashimoto,et al.  Design of a mass transport surface utilizing peristaltic motion of a self-oscillating gel. , 2009, Langmuir : the ACS journal of surfaces and colloids.

[36]  Kyu-Jin Cho,et al.  Hygrobot: A self-locomotive ratcheted actuator powered by environmental humidity , 2018, Science Robotics.

[37]  J. Aizenberg,et al.  An aptamer-functionalized chemomechanically modulated biomolecule catch-and-release system. , 2015, Nature chemistry.

[38]  J. Feldman,et al.  Breathing matters , 2018, Nature Reviews Neuroscience.