TITLE

Physical kinetics and thermodynamics of phase transitions probed by dynamic nanocalorimetry

AUTHOR(S)
Château, E.; Garden, J.-L.; Bourgeois, O.; Chaussy, J.
PUB. DATE
April 2005
SOURCE
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p151913
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A specific ac nanocalorimeter is presented for the study of kinetics in phase transitions. This apparatus designed by means of microfabrication technologies requires a 50-μm-thick solid or liquid sample. The use of the ac calorimetric method allows an operating frequency range around two decades combined with a very high sensitivity. The ability of this apparatus for thermal spectroscopy is illustrated by measuring the thermal behavior of a homopolymer, the polytetrafluoroethylene, which exhibits two phase transitions at room temperature. The variation of the thermal frequency allows the observation of kinetic effects directly seen on the thermodynamic properties (enthalpy and heat capacity). We demonstrate the possibility of extracting a quantitative value of the kinetic time constant occurring at a first-order phase transition and consequently the capabilities offered by highly sensitive ac calorimetry to investigate direct thermal dynamics in macromolecular samples.
ACCESSION #
17185409

 

Related Articles

  • Adsorbed chain-stretched coil: An unusual phase transition. Gorbunov, A. A.; Skvortsov, A. M. // Journal of Chemical Physics;4/1/1993, Vol. 98 Issue 7, p5961 

    An exact expression is obtained for the partition function of a Gaussian chain of arbitrary length adsorbed on a plane with stretching force acting on the chain’s free end. It is found that the increase in the stretching force makes the macromolecule undergo an unusual phase transition...

  • Heat capacities and thermodynamic properties of CoPc and CoTMPP. Qiu, S. J.; Chu, H. L.; Zhang, J.; Qi, Y. N.; Sun, L. X.; Xu, F. // Journal of Thermal Analysis & Calorimetry;Mar2008, Vol. 91 Issue 3, p841 

    The low-temperature molar heat capacities of CoPc and CoTMPP were measured by temperature modulated differential scanning calorimetry (TMDSC) over the temperature range from 223 to 413 K for the first time. No phase transition or thermal anomaly was observed in the experimental temperature range...

  • Nonequilibrium phase transitions in a jet of highly superheated water. Reshetnikov, A.; Mazheiko, N.; Skokov, V.; Koverda, V. // High Temperature;Nov2007, Vol. 45 Issue 6, p763 

    Results are given of an experimental study into the dependence of integral and local characteristics of hot water flow on the value of superheating and on the kinetics of boiling in this water. Abrupt variations are revealed of parameters of a jet of boiling water such as the reactive force, the...

  • Coil-globule transition of a polymer involved in excluded-volume interactions with macromolecules. Kenta Odagiri; Kazuhiko Seki // Journal of Chemical Physics;2015, Vol. 143 Issue 13, p1 

    Polymers adopt extended coil and compact globule states according to the balance between entropy and interaction energies. The transition of a polymer between an extended coil state and compact globule state can be induced by changing thermodynamic force such as temperature to alter the...

  • Polymorphism of paracetamol. Perlovich, G. L.; Volkova, Tatyana V.; Bauer-Brandl, Annette // Journal of Thermal Analysis & Calorimetry;Sep2007, Vol. 89 Issue 3, p767 

    The thermodynamic relationship between crystal modifications of paracetamol was studied by alternative methods. Temperature dependence of saturated vapor pressure for polymorphic modifications of the drug paracetamol (acetaminophen) was mea sured and thermodynamic functions of the sublimation...

  • Heat capacity at constant pressure and thermodynamic properties of phase transitions in PbMO3 ( M=Ti, Zr and Hf). Yoshida, T.; Moriya, Y.; Tojo, T.; Kawaji, H.; Atake, T.; Kuroiwa, Y. // Journal of Thermal Analysis & Calorimetry;Feb2009, Vol. 95 Issue 2, p675 

    The heat capacity of PbMO3 ( M=Ti, Zr and Hf) at constant pressure was measured using a differential scanning calorimeter (DSC) from room temperature up to 870 K. Large anomalies were found in the heat capacity curves, corresponding to the ferroelectricparaelectric phase transition in PbTiO3...

  • Heat capacity and thermodynamic properties of 1-hexadecanol. Xing, J.; Tan, Z.-C.; Shi, Q.; Tong, B.; Wang, S.-X.; Li, Y.-S. // Journal of Thermal Analysis & Calorimetry;May2008, Vol. 92 Issue 2, p375 

    The low-temperature heat capacities of 1-hexadecanol have been measured with an automatic adiabatic calorimeter over the temperature range from 80 to 370 K. A solid-liquid phase transition was observed at T m=322.225±0.002 K and the molar enthalpy and entropy of fusion were determined to be...

  • Low-temperature heat capacities and thermodynamic properties of 2,2-dimethyl-1,3-propanediol. Tong, B.; Tan, Z.-C.; Lv, X. C.; Sun, L. X.; Xu, F.; Shi, Q.; Li, Y. S. // Journal of Thermal Analysis & Calorimetry;Oct2007, Vol. 90 Issue 1, p217 

    The molar heat capacities C p,m of 2,2-dimethyl-1,3-propanediol were measured in the temperature range from 78 to 410 K by means of a small sample automated adiabatic calorimeter. A solid-solid and a solid-liquid phase transitions were found at T-314.304 and 402.402 K, respectively, from the...

  • Calorimetry of (1 − x)BaTiO3- xBa(Mg1/3Nb2/3)O3 solid solutions. Egorov, V. M.; Smirnova, E. P.; Lemanov, V. V. // Physics of the Solid State;Aug2007, Vol. 49 Issue 8, p1528 

    Phase transitions in ceramic samples of (1 − x)BaTiO3- xBa(Mg1/3Nb2/3)O3 solid solutions were studied by differential scanning calorimetry for x = 0, 0.01, 0.02, and 0.03 in the temperature ranges 255–290 K and 310–410 K. The experimental data obtained were used to derive the...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics