Self-folding origami machines powered by chemical reactions
May 2023, phys.org
They used electronic structure calculations to dissect the chemical reaction that occurs when hydrogen—adsorbed to the material—is exposed to oxygen, and were then able to exploit the crucial moment that the oxygen quickly strips the hydrogen, causing the atomically thin material to deform and bend, like a hinge. The system actuates at 600 milliseconds per cycle and can operate at 20C/68F, room temperature, in dry environments.
via Cornell University: Nanqi Bao et al, Gas-phase microactuation using kinetically controlled surface states of ultrathin catalytic sheets, Proceedings of the National Academy of Sciences (2023). DOI: 10.1073/pnas.2221740120
Image credit: AI Art - Crystals and Stones Knolling Layout - 2022
New discovery toward sugar origami
Jul 2023, phys.org
Self-folding biopolymer made of a carbohydrate sequence of polysaccharides capable of folding into a stable secondary structure"Carbohydrates can be generated with programmable shapes..."
via Max Planck Institute of Colloids and Interfaces: Giulio Fittolani et al, Synthesis of a glycan hairpin, Nature Chemistry (2023). DOI: 10.1038/s41557-023-01255-5
How origami might inform disease diagnoses
Aug 2023, phys.org
Origami -- rigid materials are folded with electrodes on each side of the panel, like an upside down, opened book with two electrodes on the front and back covers. As the electrodes unfold the strength of the electrical field between the electrodes is captured.
via University of Southern California Viterbi School of Engineering: Xinghao Huang et al, High-Stretchability and Low-Hysteresis Strain Sensors Using Origami-Inspired 3D Mesostructures, Science Advances (2023). DOI: 10.1126/sciadv.adh9799.
Researchers reveal van Hove singularity at Fermi level in kagome superconductor
Aug 2023, phys.org
Kagome -- origami-like -- I can't understand one word of this -- the superconducting state in CsV3-xTaxSb5 has significantly different characteristics from the superconducting state in CsV3Sb5 through scanning tunneling microscopy experiments, indicating the possibility of unconventional pairing superconductivity in the van Hove scenario.
via University of Science and Technology of China: Yang Luo et al, A unique van Hove singularity in kagome superconductor CsV3-xTaxSb5 with enhanced superconductivity, Nature Communications (2023). DOI: 10.1038/s41467-023-39500-7
Engineers use kirigami to make ultrastrong, lightweight structures
Aug 2023, phys.org
Kirigami -- Inspired by bones and other cellular solids found in nature, humans have used the same concept to develop a high-performance architected material known as a plate lattice, on a much larger scale than scientists have previously been able to achieve by additive fabrication. The way the researchers design, fold, and cut the pattern enables them to tune certain mechanical properties, such as stiffness, strength, and flexural modulus (tendency to resist bending).
via MIT Center for Bits and Atoms: Kirigami Corrugations: Strong, Modular, and Programmable Plate Lattices. cba.mit.edu/docs/papers/0821.ASME-Kirigami.pdf
Battery-free robots use origami to change shape in mid-air
Sep 2023, phys.org
When these "microfliers" are dropped from a drone, they use a Miura-ori origami fold to switch from tumbling and dispersing outward through the air to dropping straight to the ground. To spread out the fliers, the researchers control the timing of each device's transition using a few methods: an onboard pressure sensor (estimating altitude), an onboard timer or a Bluetooth signal.
This particular origami type is inspired by the geometries found in leaves, go figure.
via University of Washington: Kyle Johnson et al, Solar-powered Shape-changing Origami Microfliers, Science Robotics (2023). DOI: 10.1126/scirobotics.adg4276.
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