The reversibility and first-order nature of liquid-liquid transition in a molecular liquid.
The reversibility and first-order nature of liquid-liquid transition in a molecular liquid.
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DOI：
10.1038/ncomms13438
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发表时间：
2016-11-14
影响因子：
16.6
通讯作者：
Tanaka, Hajime
中科院分区：
文献类型：
--
作者：
Kobayashi, Mika;Tanaka, Hajime
液-液相变是一种有趣的现象，即一种液体通过一级相变转变为另一种液体。然而，对于分子液体，它总是发生在一个过冷的液态亚稳态结晶，这导致了一些严重的争论，关于它的起源：液-液转变与不寻常的纳米晶体的形成。因此，据我们所知，迄今为止，没有一个例子不存在这种辩论。在这里，我们表明实验证据表明，过渡是真正的液-液过渡，而不是纳米结晶的分子液体，亚磷酸三苯酯。采用快速差示扫描量热法，从动力学上分离出玻璃化转变和结晶过程中的逆液-液转变，证明了液-液转变的可逆性和一级动力学性质。这一发现不仅加深了我们对液-液相变的物理认识，而且可能从基础和应用两个角度开创液-液相变研究的新阶段。分子液体中所谓的“液-液转变”现象的本质是一个长期存在的争论。在这里，作者通过闪光差示扫描量热法证明了亚磷酸三苯酯的液-液转变的可逆性和一级性质。
Liquid–liquid transition is an intriguing phenomenon in which a liquid transforms into another liquid via the first-order transition. For molecular liquids, however, it always takes place in a supercooled liquid state metastable against crystallization, which has led to a number of serious debates concerning its origin: liquid–liquid transition versus unusual nano-crystal formation. Thus, there have so far been no single example free from such debates, to the best of our knowledge. Here we show experimental evidence that the transition is truly liquid–liquid transition and not nano-crystallization for a molecular liquid, triphenyl phosphite. We kinetically isolate the reverse liquid-liquid transition from glass transition and crystallization with a high heating rate of flash differential scanning calorimetry, and prove the reversibility and first-order nature of liquid–liquid transition. Our finding not only deepens our physical understanding of liquid–liquid transition but may also initiate a phase of its research from both fundamental and applications viewpoints. The nature of the phenomenon of so-called ‘liquid-liquid transitions' in molecular liquids is a long-standing debate. Here, the authors demonstrate the reversibility and first-order nature of the liquid-liquid transition in triphenyl phosphite via flash differential scanning calorimetry.
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