Hydrotropy and scattering: pre-ouzo as an extended near-spinodal region
Hydrotropy and scattering: pre-ouzo as an extended near-spinodal region
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水溶助长和散射：前茴香酒作为延伸的近旋节线区域
DOI：
10.1039/c7cp04990k
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Matubayasi Nobuyuki
中科院分区：
文献类型：
--
作者：
Shimizu Seishi;Matubayasi Nobuyuki
在有水相存在的情况下，增溶或混合往往伴随着散射强度的增加。当与中尺度结构相对应的散射增大时，这种混合态被称为“pre-ouzo”聚集体，这种混合态经常出现，与临界密度波动不同，但其出现的确切机制尚不清楚。将散射理论和热力学相稳定性理论与微分几何理论相结合，建立了一个统一解释水相混合热力学和前乌佐效应的理论。此外，疏水溶质的最小疏水浓度（MHC）也与散射增加有关。在最小疏水浓度下，疏水溶质的溶解度会突然增加。前乌佐效应和MHC的热力学特征揭示了它们之间的机理差异，这种差异表现在导数的热力学顺序上。
Solubilization or mixing in the presence of hydrotropes is often accompanied by the increase of scattering intensity. When the scattering corresponding to mesoscale structuring grows, the mixed state is called the “pre-ouzo” aggregate, which appears often and is distinct from critical density fluctuation, yet its precise mechanism of appearance is still obscure. Combining the results from the theories of scattering and thermodynamic phase stability with differential geometry, we have constructed a theory which can account for hydrotrope mixing thermodynamics and the pre-ouzo effect in a unified manner. In addition, another well-known signature of hydrotropy, the minimum hydrotrope concentration (MHC) at which solubility of sparingly soluble hydrophobic solutes suddenly increases, has also been linked to the scattering increase. The thermodynamic signatures of the pre-ouzo effect and MHC reveal a mechanistic difference between them, which manifests in the thermodynamic order of derivatives.