Thermal and optical characterization of pigments attached to cellulose substrates by means of a self-normalized photoacoustic technique

J.A. Balderas-López, I.S. Martínez-López, M. León-Martínez, Y.M. Gómez, Gómez. , M.E. Bautista-Ramírez, A. Muñoz-Diosdado, G. Gálvez-Co, t.. , J. Diaz-Re, es.

Abstract


A self-normalized photoacoustic (PA) methodology, involving the front and
transmission configurations in the Beer-Lambert model for light absorption,
is implemented for the measurement of optical and thermal properties of thin
layers of substances in solid phase. To achieve this, the corresponding
theoretical equations describing the PA effect in the Rosencwaig-Gersho
model, were used. This new methodology was applied for the measurement of
the optical absorption coefficient (at 658 nm) and thermal diffusivity of
paper samples with different colors. This last physical property was also
measured for all paper samples by using a self-normalized PA technique,
already reported in the literature, involving the surface absorption model.
In order to fulfill the theoretical assumptions in this last case, the paper
samples were painted, on both sides, with a black marker. The thermal
diffusivity values obtained in both cases were quite consistent among
themselves and with the corresponding ones reported for similar materials.

Keywords


Photoacoustic; thermal; optical; pigments

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REVISTA MEXICANA DE FÍSICA, year 67, issue 1, January-February 2021. Bimonthly Journal published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Apartado Postal 70-348. Tel. (+52)55-5622-4946, https://rmf.smf.mx/ojs/rmf, e-mail: rmf@ciencias.unam.mx. Chief Editor: José Alejandro Ayala Mercado. INDAUTOR Certificate of Reserve: 04-2019-080216404400-203, ISSN: 2683-2224 (on line), 0035-001X (print), both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., Fís. Efraín Garrido Román, 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, January 4, 2021.

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