Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session B30: Morphing Matter: from Soft Robotics to 4D Printing II |
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Sponsoring Units: DSOFT GSNP Chair: Pierre-Thomas Brun, Princeton University Room: 502 |
Monday, March 2, 2020 11:15AM - 11:27AM |
B30.00001: Encoding kirigami bi-materials to morph on target in response to temperature Damiano Pasini, Lu Liu, Chuan Qiao, Haichao An Shape morphing in response to an environmental stimulus, such as temperature, light, and chemical cues, is currently pursued in synthetic analogs for manifold applications in engineering, architecture, and beyond. Existing strategies mostly resort to active materials, whose responsiveness is controlled by the chemical composition and/or arrangement of their constituents, which is dispensed through a specific fabrication process. Here, we demonstrate that a pair of off-the-shelf passive solids, such as wood and silicone rubber, can be topologically arranged in a kirigami bi-material to engage temperature to collectively deploy into a geometrically rich set of periodic and aperiodic shapes that can shape-match a predefined target. The results highlight reversible morphing by mechanics and geometry, thus contributing to relax the dependence of current strategies on material chemistry and fabrication. |
Monday, March 2, 2020 11:27AM - 11:39AM |
B30.00002: Assembly Behaviors Design with Magnetic Handshake Materials Chrisy Xiyu Du, Ran Niu, Edward P Esposito, Paul L McEuen, Itai Cohen, Michael Phillip Brenner Inspired by nature’s ability of assembling intricate materials, we recently developed an assembly platform that can create specific binding by encoding magnetic dipole patterns into panel-like building blocks. With this platform, which we term magnetic handshake materials, we are able to achieve controlled polymerization, complementary binding strands and 3D folding from 2D nets. However, in order to perform more systematic materials design that can match nature’s ability, we need to develop design protocols to more efficiently search through the parameter space. Here, I will demonstrate how to use computational methods to systematically probe the design space. With the help of molecular dynamics and inverse design techniques, I will show that we can predict self-assembly behaviors of arbitrary panels based on their local interaction and optimize for specific structures. |
Monday, March 2, 2020 11:39AM - 11:51AM |
B30.00003: Photothermally Reconfigurable Shape Memory Magnetic Cilia Jessica A.-C. Liu, Benjamin A. Evans, Joseph Tracy Functional artificial cilia usually require maintaining an applied stimulus or are programmed to perform one-way processes that cannot be reset. Reconfigurable artificial cilia are desirable, whose shape can be set, locked, unlocked, and reconfigured. Magnetic iron microparticles were dispersed in a thermoplastic polyurethane shape memory polymer matrix and formed into artificial, magnetic cilia that respond simultaneously to magnetic fields and light. Temporary shapes obtained through combined magnetic actuation and photothermal heating can be locked by switching off the light and magnetic field. Subsequently turning on the light without the magnetic field drives recovery of the permanent shape of the magnetic cilia. The permanent shape can also be programmed after preparing the cilia by applying mechanical constraints and annealing at high temperature. Spatially controlled actuation of magnetic cilia is demonstrated by applying a mask for pattern transfer into the array of magnetic cilia. Development of a theoretical model aids understanding the behavior of reconfigurable magnetic cilia and provides guidelines for their design and optimization. |
Monday, March 2, 2020 11:51AM - 12:03PM |
B30.00004: Control of a Hydrogel Based Soft Robot Using Light Aaveg Aggarwal, Hang Yuan, Monica Olvera De La Cruz Soft robotics is an emerging field of research as robots built from soft materials can offer many advantages over conventional robots. Hydrogels are an interesting family of materials for realization of such soft robots as they can change their morphology by exchanging fluids with their environment. This further opens opportunities for biological applications. Remote control of these hydrogel robots with external stimuli such as light and magnetic fields can add useful functionality to them. Photo-responsive hydrogels provide an easy way to remotely control the shape of these robots by exposing them to light. This phenomenon can be exploited to design robots that can transit between multiple modes of operation by changing their geometry. To this end, we report our theoretical work on the light induced deformations in these robots and the corresponding changes in functionality. |
Monday, March 2, 2020 12:03PM - 12:15PM |
B30.00005: Semiflexible origami and their many minima Mary Elizabeth Lee-Trimble, Ji-Hwan Kang, Ryan Hayward, Christian Santangelo Self-folding origami structures, which allow flat materials to be deployed into three dimensional structures, have many engineering applications. These applications, however, require that the structures fold without error and robustly. For infinitely rigid origami, many configuration space components meet at the flat, unfolded state, so even when every fold is programmed to the desired equilibrium result, the structure can misfold into an undesired branch of configurations. Here, we show how to relax the rigidity of origami by allowing a small amount of stretching along the folds, which in turn allows Gaussian curvature at the vertices. We map the energy landscape for simple origami and explore the bifurcations of the energy landscape that lead to multiple minima. Furthermore, we explore how the basins of attraction of different energy minima affect the potential to misfold. |
Monday, March 2, 2020 12:15PM - 12:27PM |
B30.00006: Morphing Colloidal Crystals with Active Additives Bryan VanSaders, Sharon C Glotzer Active matter studies have focused mostly on homogenous systems where all elements are active. However, for dense systems the forces applied by small quantities of active matter can have far-reaching effects. Because the positions of particles in colloidal crystals are highly correlated, an active particle’s sphere of influence in such a medium can extend many particle diameters away. By controlling the creation and propagation of mobile defect species this range can be further extended. In this work we discuss how small clusters of active particles with variable diameter can cause long range shear displacement within a simulated colloidal monolayer. Such displacement can be confined to a single slip plane by the design of the embedded cluster. We approach the design of these heterogeneous active materials by focusing on the creation and migration of dislocation defects from the embedded cluster edges during expansion. We demonstrate the reconfiguration of large quantities of passive colloidal crystal with a small amount of active matter. Using a designed cluster shape with a single cyclic actuation mode, large plastic deformations can be accomplished over the course of many swell/shrink cycles, providing a new way of creating morphing matter for soft colloidal robotics. |
Monday, March 2, 2020 12:27PM - 12:39PM |
B30.00007: Generating multiple surfaces from a single inhomogeneous anisotropically deforming sheet Itay Griniasty, Itai Cohen, James Patarasp Sethna Can we make a flat sheet transform first into Rodin’s thinker and then Michelangelo’s David? |
Monday, March 2, 2020 12:39PM - 12:51PM |
B30.00008: Morphing Surfaces for μ-Contact Printing Mitchell Anthamatten, Soyoun Kim, Nan Liu, Alexander A Shestopalov, John Lambropoulos Micro contact printing is an increasingly reliable technique to pattern various ink materials with microscale precision over large areas on flat or curvilinear substrates. The method involves contacting an elastomeric stamp to a transferable ink, pickup of the ink and transfer to a target substrate, and interfacial fracture to release the ink to a target substrate. Here, we employ shape-memory surfaces with thermo-mechanical programming to achieve large-area pattern transfer to multilayered films from donor substrates to receiving plates. We show that shape-memory can enable robust pattern transfer at higher resolution. New photolithography methods were applied to create patterns of SiO2 microdiscs on a silicon wafer. High resolution pattern transfer of vapor deposited thin films was demonstrated by (i) pressing a shape-memory stamp against a donor substrate; (ii) cooling the system to encourage adhesion between the stamp and the ink; (iii) removing the stamp and pressing against a receiving substrate, and (iv) heating followed by stamp removal to transfer the material. Control experiments indicate that thermal mechanical programming is critical to successful pattern transfer. |
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