Abstract

Thermal lens (TL) spectrometry was applied to soybean biodiesel samples, in order to assess the behavior of their thermo-optical properties during the preparation before and after the washing process. The study was based on the thermal diffusivity parameter, which is highly sensitive and is related to the chemical composition of the sample. The results showed a difference of approximately 20% between the initial (unwashed) and the final (washed) steps of biodiesel production. This behavior indicates that the residue of the biodiesel production influences the thermal diffusivity value. Consequently, TL spectrometry can be a useful methodology for certifying the quality of biodiesel during production.

© 2009 Optical Society of America

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References

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  1. S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
    [CrossRef]
  2. J. Shen, R. D. Lowe, and R. D. Snook, “A model for cw laser induced mode-mismatched dual-beam thermal lens spectrometry,” Chem. Phys. 165, 385-396 (1992).
    [CrossRef]
  3. R. D. Snook and R. D. Lowe, “Thermal lens spectrometry--a review,” Analyst (Amsterdam) 120, 2051-2068 (1995).
  4. J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738-3748 (1994).
    [CrossRef]
  5. S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
    [CrossRef]
  6. S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
    [CrossRef]
  7. M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
    [CrossRef]
  8. U. Schuchardt, R. Sercheli, and R. M. Vargas, “Transesterification of vegetable oils: a review,” J. Brazil. Chem. Soc. 9, 199-210 (1998).
    [CrossRef]
  9. T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
    [CrossRef]
  10. J. Georges and T. Paris, “Influence of the Soret effect on the analytical signal in cw-laser thermal lens spectrometry of micellar solutions,” Anal. Chim. Acta 386, 287-296 (1999).
    [CrossRef]

2008 (2)

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

2005 (1)

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

2003 (1)

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

2000 (1)

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

1999 (1)

J. Georges and T. Paris, “Influence of the Soret effect on the analytical signal in cw-laser thermal lens spectrometry of micellar solutions,” Anal. Chim. Acta 386, 287-296 (1999).
[CrossRef]

1998 (1)

U. Schuchardt, R. Sercheli, and R. M. Vargas, “Transesterification of vegetable oils: a review,” J. Brazil. Chem. Soc. 9, 199-210 (1998).
[CrossRef]

1995 (1)

R. D. Snook and R. D. Lowe, “Thermal lens spectrometry--a review,” Analyst (Amsterdam) 120, 2051-2068 (1995).

1994 (1)

J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738-3748 (1994).
[CrossRef]

1992 (1)

J. Shen, R. D. Lowe, and R. D. Snook, “A model for cw laser induced mode-mismatched dual-beam thermal lens spectrometry,” Chem. Phys. 165, 385-396 (1992).
[CrossRef]

Albuquerque, T. A. S.

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

Andrade, A. A.

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Andrade, L. H. C.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

Aristone, F.

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

Baesso, M. L.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738-3748 (1994).
[CrossRef]

Bannwart, E. S.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

Bento, A. C.

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

Buba, E.

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

Castro, M. P. P.

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Catunda, T.

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

Constantini, R.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

Constantino, R.

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Del Ré, P. V.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

Figueiredo, M. S.

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

Franco, R. W. A.

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Georges, J.

J. Georges and T. Paris, “Influence of the Soret effect on the analytical signal in cw-laser thermal lens spectrometry of micellar solutions,” Anal. Chim. Acta 386, 287-296 (1999).
[CrossRef]

Izida, T.

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

Jorge, N.

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

Lima, S. M.

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

Lowe, R. D.

R. D. Snook and R. D. Lowe, “Thermal lens spectrometry--a review,” Analyst (Amsterdam) 120, 2051-2068 (1995).

J. Shen, R. D. Lowe, and R. D. Snook, “A model for cw laser induced mode-mismatched dual-beam thermal lens spectrometry,” Chem. Phys. 165, 385-396 (1992).
[CrossRef]

Medina, A. N.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

Miranda, L. C. M.

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

Miranda, P. C. M. L.

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Oliveira, R. G.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

Paris, T.

J. Georges and T. Paris, “Influence of the Soret effect on the analytical signal in cw-laser thermal lens spectrometry of micellar solutions,” Anal. Chim. Acta 386, 287-296 (1999).
[CrossRef]

Pedrochi, F.

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

Pereira, J. R. D.

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

Pereira, P. R. B.

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

Sampaio, J. A.

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

Schuchardt, U.

U. Schuchardt, R. Sercheli, and R. M. Vargas, “Transesterification of vegetable oils: a review,” J. Brazil. Chem. Soc. 9, 199-210 (1998).
[CrossRef]

Sercheli, R.

U. Schuchardt, R. Sercheli, and R. M. Vargas, “Transesterification of vegetable oils: a review,” J. Brazil. Chem. Soc. 9, 199-210 (1998).
[CrossRef]

Shen, J.

J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738-3748 (1994).
[CrossRef]

J. Shen, R. D. Lowe, and R. D. Snook, “A model for cw laser induced mode-mismatched dual-beam thermal lens spectrometry,” Chem. Phys. 165, 385-396 (1992).
[CrossRef]

Snook, R. D.

R. D. Snook and R. D. Lowe, “Thermal lens spectrometry--a review,” Analyst (Amsterdam) 120, 2051-2068 (1995).

J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738-3748 (1994).
[CrossRef]

J. Shen, R. D. Lowe, and R. D. Snook, “A model for cw laser induced mode-mismatched dual-beam thermal lens spectrometry,” Chem. Phys. 165, 385-396 (1992).
[CrossRef]

Sthel, M.

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Vargas, H.

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Vargas, R. M.

U. Schuchardt, R. Sercheli, and R. M. Vargas, “Transesterification of vegetable oils: a review,” J. Brazil. Chem. Soc. 9, 199-210 (1998).
[CrossRef]

Anal. Chim. Acta (1)

J. Georges and T. Paris, “Influence of the Soret effect on the analytical signal in cw-laser thermal lens spectrometry of micellar solutions,” Anal. Chim. Acta 386, 287-296 (1999).
[CrossRef]

Analyst (Amsterdam) (1)

R. D. Snook and R. D. Lowe, “Thermal lens spectrometry--a review,” Analyst (Amsterdam) 120, 2051-2068 (1995).

Chem. Phys. (1)

J. Shen, R. D. Lowe, and R. D. Snook, “A model for cw laser induced mode-mismatched dual-beam thermal lens spectrometry,” Chem. Phys. 165, 385-396 (1992).
[CrossRef]

Chem. Phys. Lett. (1)

M. P. P. Castro, A. A. Andrade, R. W. A. Franco, P. C. M. L. Miranda, M. Sthel, H. Vargas, R. Constantino, and M. L. Baesso, “Thermal properties measurements in biodiesel oils using photothermal techniques,” Chem. Phys. Lett. 411, 18-22 (2005).
[CrossRef]

Eur. Phys. J. Special Topics (1)

S. M. Lima, T. Izida, M. S. Figueiredo, L. H. C. Andrade, P. V. Del Ré, N. Jorge, E. Buba, and F. Aristone, “Analysis of biodiesel and frying vegetable oils by means of FTIR photoacoustic spectroscopy,” Eur. Phys. J. Special Topics 153, 535-537 (2008).
[CrossRef]

J. Appl. Phys. (1)

J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738-3748 (1994).
[CrossRef]

J. Brazil. Chem. Soc. (1)

U. Schuchardt, R. Sercheli, and R. M. Vargas, “Transesterification of vegetable oils: a review,” J. Brazil. Chem. Soc. 9, 199-210 (1998).
[CrossRef]

J. Non-Cryst. Solids (1)

S. M. Lima, J. A. Sampaio, T. Catunda, A. C. Bento, L. C. M. Miranda, and M. L. Baesso, “Mode-mismatched thermal lens spectrometry for thermo-optical properties measurement in optical glasses: a review,” J. Non-Cryst. Solids 273, 215-227 (2000).
[CrossRef]

Rev. Sci. Instrum. (1)

T. A. S. Albuquerque, P. R. B. Pereira, A. N. Medina, J. R. D. Pereira, A. C. Bento, and M. L. Baesso, “Time resolved thermal lens in edible oils,” Rev. Sci. Instrum. 74, 694-696(2003).
[CrossRef]

The Eur. Phys. J. Special Topics (1)

S. M. Lima, E. S. Bannwart, R. G. Oliveira, L. H. C. Andrade, P. V. Del Ré, N. Jorge, F. Pedrochi, R. Constantini, A. N. Medina, and M. L. Baesso, “Evaluation of the thermal diffusivity of vegetable oils during frying by thermal lens spectrometry,” The Eur. Phys. J. Special Topics 153, 531-534(2008).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

(a) Experimental setup with a single beam to excite and probe the thermal lens effect. (b) Beam position with respect to the sample. In our setup, w o = 8.61 × 10 3 cm , w = 16.77 × 10 3 cm , Z o = 15.88 cm , Z 1 = 6.2 cm , and Z c = 3.84 cm .

Fig. 2
Fig. 2

Thermal lens transients for unwashed (UWSB) and washed (WSB) soybean biodiesel, obtained at 632.8 nm with 16.4 mW of excitation power. The solid lines are the theoretical curves obtained from Eq. (1).

Fig. 3
Fig. 3

(a) Visible and (b) medium infrared absorbance spectra for unwashed (UWSB) and washed (WSB) soybean biodiesel.

Fig. 4
Fig. 4

Thermal lens transients for purified soybean oil (PSO) and refined soybean oil (RSO) obtained at 632.8 nm with 16.4 mW of excitation power. The solid lines are the theoretical curves obtained from Eq. (1). The PSO curve was multiplied by a factor 0.989 for better visualization of the curves.

Fig. 5
Fig. 5

Thermal lens transients for washed (WSB) soybean biodiesel, before and after thermal treatment, obtained at 632.8 nm with 16.4 mW of excitation power. The solid lines are the theoretical curves obtained from Eq. (1).

Tables (1)

Tables Icon

Table 1 Thermal Diffusivity, Thermal Conductivity, and Absorption Coefficient at 632.8 nm to the Unwashed Soybean Biodiesel (UWSB) and Washed Soybean Biodiesel (WSB) Samples a

Equations (2)

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I ( t ) = I o { 1 θ 2 tan 1 [ 2 V ( 9 + V 2 ) t c / 2 t + 3 + V 2 ] } 2 ,
θ = P abs K λ φ d n d T ,

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