A mixture of triethylamine and water is a lower critical solution temperature system that demixes (separates into individual phases) on heating. Differential scanning calorimetry has been applied to study the process of demixing in native and organically modified silica nanopores whose size varied from 4 to 30 nm. It has been found that in both types of nanopores, the temperature and enthalpy of demixing decrease significantly with decreasing the pore size. Isoconversional kinetic analysis has been utilized to determine the activation energy and pre-exponential factor of the process. It has been demonstrated that the depression of the transition temperature upon nanoconfinement is associated with acceleration of the process due to lowering of the activation energy. Nanoconfinement has also been found to lower the pre-exponential factor of the process that has been linked to a decrease in the molecular mobility.

中文翻译：

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天然和有机改性的二氧化硅纳米孔中三乙胺和水的相分离

三乙胺和水的混合物是较低的临界溶液温度系统，该系统在加热时会分解（分离成各个相）。差示扫描量热法已被用于研究在天然和有机改性的二氧化硅纳米孔中分离的过程，该纳米孔的尺寸从4到30 nm不等。已经发现，在两种类型的纳米孔中，随着孔径的减小，分解的温度和焓均显着降低。等转化动力学分析已被用来确定该过程的活化能和指数前因子。已经证明，由于降低了活化能，在纳米约束下转变温度的降低与过程的加速有关。