Method and apparatus for modulated differential analysis

Thermal measuring and testing – Differential thermal analysis – Detail of electrical heating control

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374 33, 374 43, G01N 2500

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active

052247759

ABSTRACT:
The present invention relates to differential analytical techniques for determining the composition, phase, structure, identification or other properties of a material that undergoes a transition as function of a driving variable. As applied to differential scanning calorimetric analysis (DSC), the preferred embodiment comprises: (1) heating a sample of the material with a linear temperature ramp that is modulated with a sinusoidal heating rate oscillation; and (2) deconvoluting the resultant heat flow signal into rapidly reversible and non-rapidly reversible components.

REFERENCES:
patent: 3263484 (1966-08-01), Watson et al.
patent: 3271996 (1966-09-01), Paulik et al.
patent: 3339398 (1967-09-01), Barrall, II et al.
patent: 3417604 (1968-12-01), Bean et al.
patent: 4255961 (1981-03-01), Biltonen et al.
patent: 4690569 (1987-09-01), Veitch
patent: 4783174 (1988-11-01), Gmelin et al.
patent: 4812051 (1989-03-01), Paulik et al.
patent: 4838706 (1989-06-01), Coey et al.
P. Sullivan and G. Seidel, "Steady State, ac-Temperature Calorimetry," Physical Review, vol. 173, No. 3, Sep. 15, 1968, pp. 679-685.
N. Birge, and S. Nagel, "Specific-Heat Spectroscopy of the Glass Transition," Physical Review Letters, vol. 54, No. 25, Jun. 24, 1985, pp. 2674-2677.
N. Birge, "Specific-heat Spectroscopy of Glycerol and Propylene Glycol Near the Glass Transition," Physical Review B, vol. 34, No. 3, Aug. 1, 1986, pp. 1631-1642.
Jung, D. H., Kwon, T. W.; Bae, D. J.; Moon, I. K., and Jeong, Y. H., "Fully Automated Dynamic Calorimeter" Meas. Sci. Technol., vol. 3, 1992, pp. 475-484.
N. Birge and S. Nagel, "Wide Frequency Specific Heat Spectrometer," Rev. Sci. Instrum., vol. 58, Aug. 1987, pp. 1464-1470.
C. C. Williams and H. K. Wickramasinghe, "Photothermal Imaging with Sub-100-nm Spatial Resolution," P. Hess and J. Pelzl, eds., Springer Ser. Opt. Sci. v. 58, pp. 364-369, New York (1988), Photoacoustic and Photothermal Phenomena, Proceedings.
H. Yao and I. Hatta, "An ac Microcalorimetric Method for Precise Heat Capacity Measurement in a Small Amount of Liquid," pp. L121-L122, Jan., 1988, Japanese Journal of Applied Physics, v. 27, No. 1.
I. Hatta and A. J. Ikushima, "Studies on Phase Transitions by AC Calorimetry," pp. 1995-2011, Nov. 1981, Japanese Journal of Applied Physics, v. 20, No. 11.
ULVAC SINKU-RIKO, Inc. product brochure PIT-R1, "Thermal Constants Analyzer by AC Calorimetric Method," publication date unknown, Catalog No. 9010-PITRI/90.10.3000.
ULVAC SINKU-RIKO, Inc. product brochure ACC-1, "AC Calorimeter," publicatoin date unknown, Catalog No. 8909-A13E/90.7.1000.
ULVAC SINKU-RIKO, Inc. product brochure ACC-VL1, "AC Calorimeter," publication date unknown, Catalog No. 9102-A24E.
O. L. Mayorga, W. W. van Osdol, J. L. Lacomba and E. Freire, "Frequency Spectrum of Enthalpy Fluctuations Associated With Macromolecular Transitions," Proc. Natl. Acad. Sci. USA, vol. 85, Dec. 1988, pp. 9514-9518.

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