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yexuqing木蟲之王 (文學泰斗)
太陽系系主任
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[交流]
Dome-celled aerogels with ultrahigh-temperature superelasticity over 2273 K
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Dome-celled aerogels with ultrahigh-temperature superelasticity over 2273 K 2273K以上超高溫超彈性圓頂晶胞氣凝膠 ▲ 作者：KAI PANG, YUXING XIA, XIAOTING LIU, WENHAO TONG, XIAOTONG LI, CHENYANG LI, ET AL. ▲鏈接： https://www.science.org/doi/10.1126/science.adw5777 ▲摘要： 氣凝膠以其高孔隙率和極低密度而聞名，可由一系列材料制成，但在極端熱機械條件下的應(yīng)用受限于結(jié)構(gòu)不穩(wěn)定性。 研究組報道了194種圓頂晶胞超輕氣凝膠，通過二維通道限域化學策略實現(xiàn)了從4.2K至2273K極寬溫度范圍內(nèi)的優(yōu)異彈性。這種氣凝膠在99%應(yīng)變下2萬次循環(huán)后仍表現(xiàn)出超彈性，在2273K高溫下100次循環(huán)后表現(xiàn)出抗熱震性。 這種高熵碳化物氣凝膠在1273 K和2273 K下的導(dǎo)熱系數(shù)分別為53.4 mW·m?1·K?1和171.1 mW·m?1·K?1。溫度不變彈性和化學多樣性的結(jié)合使得這種氣凝膠在從隔熱工業(yè)到深空探索等極端熱機械應(yīng)用中極具前景。 ▲ Abstract： Aerogels are known for their high porosity and very low density and can be made from a range of materials, but are limited by structural instability under extreme thermomechanical conditions. We report on 194 types of dome-celled ultralight aerogels that maintain superior elasticity spanning from 4.2 kelvin (K) to 2273 K, realized by a two-dimensional channel–confined chemistry method. Such aerogels exhibit superelasticity under 99% strain for 20,000 cycles and thermal shock resistance at 2273 K over 100 cycles. The high-entropy carbide aerogel achieves a thermal conductivity of 53.4 mW·m?1·K?1 at 1273 K and 171.1 mW·m?1·K?1 at 2273 K. The combination of temperature-invariant elasticity and chemical diversity makes such aerogels highly promising for extreme thermomechanics, from heat-insulated industries to deep space exploration. |
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