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The stretching motions of CH on diamond C(111) single- and nanocrystal surfaces have been investigated using Fourier transform infrared spectroscopy. The observations at 800 K indicate a band center o...
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Response to ``Comment on `The effect of charged impurities on a glass transition in a polar medium' '' [J. Chem. Phys. 105, 8979 (1996)]
The theory presented in [J. Chem. Phys. 104, 669 (1996)] deals with the effect of separated charged impurities on the glass transition temperature Tg. To explain experimental data on the effect of sal...

Comment on ``The effect of charged impurities on a glass transition in a polar medium'' [J. Chem. Phys. 104, 664 (1996)]

J. Chem. Phys. 105, 8979 (1996); doi:10.1063/1.472734

Issue Date: 15 November 1996

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Danforth P. Miller and Juan J. de Pablo
Department of Chemical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706

Horacio R. Corti
Departamento de Química, Comisión Nacional de Energía Atómica, (1429) Buenos Aires, Argentina
Dakhnovskii and Lubchenko have recently presented a theory to predict the effect of charged impurities on the glass transition temperature (Tg) in a polar medium. We present and cite more extensive sets of experimental results that show that the electrolyte concentration required to induce a 10 K increase in Tg is nearly three orders of magnitude greater than that predicted from their theory. ©1996 American Institute of Physics.
History: Received 12 February 1996; accepted 1 August 1996) [S0021-9606(96)50242-4]
Permalink: http://link.aip.org/link/?JCPSA6/105/8979/1
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KEYWORDS and PACS

Keywords
PACS
  • 64.70.Pf
    Equations of state, phase equilibria, and phase transitions Specific phase transitions Glass transitions
  • 71.55.Jv
    Electronic structure Impurity and defect levels Disordered structures; amorphous and glassy solids
  • YEAR: 1996

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (7)
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  1. Y. Dakhnovskii and V. Lubchenko, J. Chem. Phys. 104, 664 (1996). [ChemPort]
  2. While the dipole moment of liquid water is about 2.2 D, DL use a dipole moment of 3.5 D. These authors indicate, however, that the dipole moment appearing in their theory should be viewed as an adjustable parameter.
  3. The inconsistencies in the concentration units used by DL can be a source of confusion when attempting to apply their theory. In their paper, the symbol c is defined as a molar concentration [Eq. (23) of Ref. 1] . This concentration variable c appears in Eq. (21) of Ref. 1 for prediction of the glass transition temperature as a function of the ionic concentration. Their results for Tg, however, are reported in Fig. 1 of Ref. 1 as a function of "relative concentration," which they define as the ratio of the number of charges to the number of dipoles in the system. It appears that DL used this latter measure of concentration, and not c for their calculations. If, however, molar concentrations are used in Eq. (21), then the predictions of the theory are worse.
  4. C. A. Angell and J. C. Tucker, J. Phys. Chem. 84, 268 (1980). [ISI] [ChemPort]
  5. K. Hofer, G. Astl, E. Mayer, and J. P. Johari, J. Phys. Chem. 95, 10777 (1991). [Inspec] [ISI] [ChemPort]
  6. G. Fleissner, A. Hallbrucker, and E. Mayer, J. Phys. Chem. 97, 4806 (1993). [ISI]
  7. D. P. Miller, J. J. de Pablo, and H. R. Corti (in preparation).

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