Showing papers by "Sung Hoon Kang published in 2023"
TL;DR: Wang et al. as mentioned in this paper report a material that shows different mechanical responses based on the loading direction (nonreciprocity), allowing, for example, guided sound propagation, directional mass transport or concentration of mechanical energy using random mechanical movement, and the ability to steer away from impact, earthquake or vibration.
Abstract: A material with asymmetric mechanical responses offers diverse potential applications Mechanical movement or energy, in the form of wind (1), waves (2), and vibration (3), is abundant. However, most of this energy is scarcely used for reasons that include difficulty of collection or manipulation. Furthermore, unwanted propagation of mechanical energy can result in detrimental effects, including sound pollution, injury to humans, and damage to vehicles and infrastructures. But what if mechanical energy could be controlled or used through materials that allow preferential transport of mechanical energy in a particular direction? On page 192 of this issue, Wang et al. (4) report such a material that shows different mechanical responses based on the loading direction (“nonreciprocity”). This could open doors for applications in guiding, controlling, and damping mechanical energies, allowing, for example, guided sound propagation, directional mass transport or concentration of mechanical energy using random mechanical movement, and the ability to steer away from impact, earthquake, or vibration.
1 citations
TL;DR: The VasoLock as discussed by the authors is a nonabsorbable, sutureless anastomosis device with traction anchors designed to hold free artery ends together, but it does not penetrate the vessel wall but adhere by leveraging the elasticity of the vessels to fasten blood vessels together.
TL;DR: A bio-inspired flexible piezoresistive MWCNTs/PDMS composite with a multilayered architecture mimicking the ant tentacle and the pomelo peel is innovatively constructed, which can simultaneously detect physical stimuli in an extensive pressure range and absorb impact energy as discussed by the authors .
Abstract: The multifunctional features of pressure sensitivity and energy-absorption capability of flexible electromechanical sensors are desirable for practical applications, such as personal protection, crash mitigation, and protective packaging of sensitive elements. However, there are still challenges in developing ultrasensitive pressure sensors with high energy absorption capability. Herein, a bio-inspired flexible piezoresistive MWCNTs/PDMS composite with a multilayered architecture mimicking the ant tentacle and the pomelo peel is innovatively constructed, which can simultaneously detect physical stimuli in an extensive pressure range and absorb impact energy. The composite architecture is composed of the bottom-layer interlocked tentacle-like conical micropillars and the top-layer pomelo peel-inspired hierarchically enclosed-porous microstructure, which has successfully wrapped air inside to form a solid-gas dual phase structure with enhanced energy absorbing capability and piezoresistivity. The composite architecture was manufactured by a laser-engraving method associated with the controlled solidification process of the composite by regulating the vacuum pumping rate in the pre-curing condition. Owing to the hollow-shaped tentacle-like conical micropillars, the contact area can be dramatically increased within a subtle pressure loading, leading to superb pressure sensitivity of ∼26.1 kPa−1. Simultaneously, the hierarchically enclosed-porous structure with trapped air (gas-phase), acting as an air cushion packaging, imitating the pomelo peel provides the composite architecture with exceptional mechanical energy absorption of ∼2.74 MJ/m3 and an extensive pressure sensing range from 0.1 Pa to 60 kPa. As a result, the as-proposed composite sensor was able to detect mechanical signals such human finger tapping, wrist flexion, and pendulum hammer impact. Numerical simulations also showed that the wrapped air inside the hierarchical enclosed-porous structure improved the mechanical damping properties of the composite architecture. It is envisioned that our finding could contribute to the development of multifunctional materials to meet the growing demands for next-generation electronic systems, inspired by sophisticated architectures from nature.