PHASE TRANSITIONS OF ADSORBATES: 1. SPECIFIC HEAT AND DIMENSIONAL CHANGES OF THE POROUS GLASS – WATER SYSTEM

Autor:	G. G. Litvan
Rok vydání:	1966
Předmět:	Fusion Phase transition Range (particle radiation) Specific heat Chemistry Organic Chemistry Analytical chemistry General Chemistry Porous glass Catalysis Crystallography Latent heat Monolayer Porosity
Zdroj:	Canadian Journal of Chemistry. 44:2617-2622
ISSN:	1480-3291 0008-4042
DOI:	10.1139/v66-394
Popis:	The specific heat and dimensional changes of the porous 96% silica glass – water system were measured simultaneously between −35 °C and +2 °C with coverages of 1.6, 4.0, 5.3, and 7.7 molecular layers. The specific heat of the adsorbate below the transition range was found to be higher than that of ice. No phase change was detected with the lowest concentration. At the higher coverages, transition always occurred near −9.5° and was of the anomalous first order type. The values of the specific latent heat of fusion, calculated by assuming that two monolayers do not freeze, are 49.4, 54.4, and 55.5 calg−1, depending on the concentration. The correlation between the results of calorimetric and dimensional change measurements was considered satisfactory.
Databáze:	OpenAIRE
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