Confined water in controlled pore glass CPG-10-120 studied by positron annihilation lifetime spectroscopy and differential scanning calorimetry

11th International Workshop on Positron and Positronium Chemistry

物理学;化学

Šaua, O.^1 ; Mat'Ko, I.^1 ; Illeková, E.^1 ; Macová, E.^2 ; Berek, D.^2

Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava

845 11, Slovakia^1

Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava

845 41, Slovakia^2

关键词: Amorphous and crystalline phasis;    Confined liquids;    Controlled pore glass;    Cooling regimes;    Freezing-point depression;    Lower temperatures;    Positron annihilation lifetime spectroscopy;    Solidification and melting;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/618/1/012041/pdf
DOI  :  10.1088/1742-6596/618/1/012041

来源: IOP

【 摘 要 】

The solidification and melting of water confined in the controlled pore glass (CPG) with average pore size 12.6 nm has been studied by differential scanning calorimetry (DSC) and positron annihilation lifetime spectroscopy (PALS). The fully-filled sample of CPG by water as well as the samples of CPG with different content of water were used. The measurements show the presence of amorphous and crystalline phases of water in this type and size of pores, freezing point depression of a confined liquid and presence of certain transitions at lower temperatures, which could be detected only for cooling regime. The localization of confined water in the partially filled pores of CPG at room temperature was studied.