M?todo de lente t?rmica resuelta en frecuencia para medir coeficientes de difusi?n t?rmica en muestras l?quidas
An experiment for measuring the thermal diffusivity of a liquid sample and nanoparticle colloidal systems using the thermal lens effect, induced by a frequency modulated laser diode, is proposed. The method consists in measuring the photothermal signal depending on the modulation frequency of the...
Guardado en:
Autores Principales: | , , |
---|---|
Formato: | Artículos |
Lenguaje: | spa |
Publicado: |
2016
|
Materias: | |
Acceso en línea: | http://repositorio.educacionsuperior.gob.ec/handle/28000/3128 |
Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
Sumario: | An experiment for measuring the thermal diffusivity of a liquid sample and nanoparticle colloidal systems using the thermal lens effect,
induced by a frequency modulated laser diode, is proposed. The method consists in measuring the photothermal signal depending on the
modulation frequency of the laser. From the experimental data is possible to estimate the thermal diffusivity of the sample if the radius of
the laser beam is known. The experiment is calibrated by estimating the thermal diffusivity of ethanol. Thermal diffusivity coef?cients of
aqueous solutions of Brilliant Blue FCF and silver nanoparticles systems are also estimated indicating an increment of an order of magnitude
of the nanoparticles system relative to the base liquid. The results show that the method is robust, with a reduced implementation cost and
sensitivity enough to thermally characterize transparent and semi-transparent liquid materials. |
---|