顺式萘烷及顺/反式萘烷混合物的高稳定性玻璃
Highly Stable Glasses of cis-Decalin and cis/trans-Decalin Mixtures
AI总结：
研究利用原位交流纳米量热法，首次制备出顺式萘烷及顺/反式萘烷混合物的高稳定性玻璃，其中50/50混合物的稳定性最优，相关成果为超稳定玻璃的制备提供了新方向。
AI中文摘要：
采用原位交流纳米量热法测量气相沉积的十氢化萘（decalin）玻璃的可逆热容。与对应液体冷却玻璃相比，由顺式萘烷及多种顺/反式萘烷混合物制备的玻璃具有低热容和高动力学稳定性，这是分子混合物形成高稳定性玻璃的首次报道。50/50顺/反式萘烷混合物是已报道的能形成超稳定玻璃的最高脆性材料，该混合物表现出高动力学稳定性：在116 K（0.86 Tg）下沉积的~500 nm薄膜，其转变时间相当于退火温度下过冷液体结构弛豫时间的104.4倍。顺式萘烷及萘烷混合物形成的稳定玻璃，其热容比液体冷却玻璃低达4.5%。
英文摘要：
In situ AC nanocalorimetry was used to measure the reversing heat capacity of vapor-deposited glasses of decahydronaphthalene (decalin). Glasses with low heat capacity and high kinetic stability, as compared to the corresponding liquid-cooled glass, were prepared from cis-decalin and from several cis/trans-decalin mixtures. This is the first report of highly stable glass formation for molecular mixtures. The 50/50 cis/trans-decalin mixture is the highest fragility material reported to produce an ultrastable glass. The 50/50 mixture exhibited high kinetic stability, with an ~500 nm film deposited at 116 K (0.86 Tg,) displaying a transformation time equivalent to 104.4 times the structural relaxation time of the supercooled liquid at the annealing temperature. Cis-decalin and the decalin mixture formed stable glasses that had heat capacities as much as 4.5% lower than the liquid-cooled glass.
