Photothermal techniques applied to the thermal characterization of L-Cysteine-nanofluid


E. Maldonado Alvarado1, J. Jiménez Pérez2, A. Cruz Orea3, E. Ramón Gallegos1, J. Hernández Rosas2 and P. Lomeli Mejia4

1Environment Citopathology Laboratory, Morphology Departament, Escuela Nacional de Ciencias Biológicas del IPN, Col. Sto. Tomas, México D.F., México
2Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Col. Barrio la Laguna Ticomán Delegación Gustavo A. Madero, México D.F., Mexico
3Departamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Col. San Pedro Zacatenco, México D.F., México
4Centro Nacional de Rehabilitación y Ortopedia, Col. Arenal de Guadalupe, México D.F., Mexico

Keywords: phothermal techniques
property: thermal diffusivity
material: nanoparticles

Thermal diffusivity (D) and effusivity (e) measurements were carried out in L-cysteine nanoliquid (L-Cysteine in combination with Au nanoparticles and protoporphyrin IX (PpIX) nanofluid) by using thermal lens spectrometry (TLS) and photopyroelectric (PPE) techniques respectively. In TLS technique was used the two mismatched mode experimental configuration, with an Ar+ laser, 514 nm wavelength, used as the heating source and an intensity stabilized He-Ne laser as the probe beam. Experimental determination of the characteristic time constant of transient TL signal is obtained by fitting the theoretical equation to experimental data. To obtain the sample thermal effusivity (e) using the PPE technique, the temperature variation of a sample that is exposed to a modulated radiation, is measured with a pyrolectric sensor. From the PPE theory it is possible to determine the e value by the fitting the PPE signal, as a function of the frequency of the modulated radiation, to the PPE theoretical equation. The obtained thermal diffusivity and effusivity values are in agreement with reported values. The results of the present study could be applied to the detection of tumors by using the L-Cysteine in combination with Au nanoparticles and protoporphyrin IX (PpIX) nanofluid, called conjugated in the present study.


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