Pressure-Modulated Differential Scanning Calorimetry. An Approach to the Continuous, Simultaneous Determination of Heat Capacities and Expansion Coefficients#

Pressure-Modulated Differential Scanning Calorimetry. An Approach to the Continuous, Simultaneous Determination of Heat Capacities and Expansion Coefficients#
Received for review June 3, 2005. Accepted December 6, 2005.
Web Release Date: January 21, 2006
K. Boehm, J. R?sgen, and H.-J. Hinz*
Anal. Chem.
ACS Publications
Copyright? 2006 American Chemical Society
Institut f?r Physikalische Chemie, Westf?lische Wilhelms-Universit?t M?nster, Corrensstrasse 30, 48149 M?nster, Germany
Abstract:
A new method is described that permits the continuous and synchronous determination of heat capacity and expansibility data. We refer to it as pressure-modulated differential scanning calorimetry (PMDSC), as it involves a standard DSC temperature scan and superimposes on it a pressure modulation of preselected format. The power of the method is demonstrated using salt solutions for which the most accurate heat capacity and expansibility data exist in the literature. As the PMDSC measurements could reproduce the parameters with high accuracy and precision, we applied the method also to an aqueous suspension of multilamellar DSPC vesicles for which no expansibility data had been reported previously for the transition region. Excellent agreement was obtained between data from PMDSC and values from independent direct differential scanning densimetry measurements. The basic theoretical background of the method when using sawtooth-like pressure ramps is given under Supporting Information, and a complete statistical thermodynamic derivation of the general equations is presented in the accompanying paper.
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