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  • Title: In situ nanocalorimetry of thin glassy organic films.
    Author: León-Gutierrez E, Garcia G, Lopeandía AF, Fraxedas J, Clavaguera-Mora MT, Rodríguez-Viejo J.
    Journal: J Chem Phys; 2008 Nov 14; 129(18):181101. PubMed ID: 19045378.
    Abstract:
    In this work, we describe the design and first experimental results of a new setup that combines evaporation of liquids in ultrahigh vacuum conditions with in situ high sensitivity thermal characterization of thin films. Organic compounds are deposited from the vapor directly onto a liquid nitrogen cooled substrate, permitting the preparation and characterization of glassy films. The substrate consists of a microfabricated, membrane-based nanocalorimeter that permits in situ measurements of heat capacity under ultrafast heating rates (up to 10(5) K/s) in the temperature range of 100-300 K. Three glass forming liquids-toluene, methanol, and acetic acid-are characterized. The spikes in heat capacity related to the glass-transition temperature, the fictive temperature and, in some cases, the onset temperature of crystallization are determined for several heating rates.
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