SILICA-GEL ABSORTION CHARACTERIZATION BY A LASER SPECKLE TECHNIQUE

C. I. CABELLOA, G. BERTOLINIA, S. AMAYAB, R. ARIZAGAB, M. TRIVIB,

Guanajuato, Méjico

Congreso; 3 º International Sol-Gel Science and Applications Congress y VI Copngreso Nacional de Materiales Sol-Gel; 2006

Univ. Guanajuato y Sociedad Internacional de Ciencia y Tecnología de Materiales Sol-Gel.

Abstract When a coherent laser beam illuminates a rough surface of an object, a typical speckle pattern is observed. If the surface of the objects does not remain rigid, but it presents some type of local movement, then the intensity diagram of the observed speckle evolves in time. This phenomenon, well known as dynamic speckle, is characteristic of biological samples. This behavior of speckle pattern can also be observed in non-biological industrial processes, including the drying of paint, corrosion and heat exchange. The visual appearance of the speckle diagram is similar to that of a boiling liquid. This activity takes place when the sample changes its properties due to movement of the scattering centers, changes in the optical path due to variations of refractive index, configuration changes or combination of these situations. The study of the temporary evolution of the speckle patterns may provide an interesting tool to characterize the parameters involved in these processes. The present work shows the dynamic speckle application to the study of commercial silica-gel with different textural properties, i.e. grain size, superficial area and pore volume. The experimental results show the temporary evolution of the speckle patterns from the samples during the water absorption process. This technique enables the comparison between a variety of products and an eventually correlation with textural parameters. Besides, this analysis can be considered as a potential new method to study different porous materials of interest such as absorbents or catalysts supports.speckle pattern is observed. If the surface of the objects does not remain rigid, but it presents some type of local movement, then the intensity diagram of the observed speckle evolves in time. This phenomenon, well known as dynamic speckle, is characteristic of biological samples. This behavior of speckle pattern can also be observed in non-biological industrial processes, including the drying of paint, corrosion and heat exchange. The visual appearance of the speckle diagram is similar to that of a boiling liquid. This activity takes place when the sample changes its properties due to movement of the scattering centers, changes in the optical path due to variations of refractive index, configuration changes or combination of these situations. The study of the temporary evolution of the speckle patterns may provide an interesting tool to characterize the parameters involved in these processes. The present work shows the dynamic speckle application to the study of commercial silica-gel with different textural properties, i.e. grain size, superficial area and pore volume. The experimental results show the temporary evolution of the speckle patterns from the samples during the water absorption process. This technique enables the comparison between a variety of products and an eventually correlation with textural parameters. Besides, this analysis can be considered as a potential new method to study different porous materials of interest such as absorbents or catalysts supports.dynamic speckle, is characteristic of biological samples. This behavior of speckle pattern can also be observed in non-biological industrial processes, including the drying of paint, corrosion and heat exchange. The visual appearance of the speckle diagram is similar to that of a boiling liquid. This activity takes place when the sample changes its properties due to movement of the scattering centers, changes in the optical path due to variations of refractive index, configuration changes or combination of these situations. The study of the temporary evolution of the speckle patterns may provide an interesting tool to characterize the parameters involved in these processes. The present work shows the dynamic speckle application to the study of commercial silica-gel with different textural properties, i.e. grain size, superficial area and pore volume. The experimental results show the temporary evolution of the speckle patterns from the samples during the water absorption process. This technique enables the comparison between a variety of products and an eventually correlation with textural parameters. Besides, this analysis can be considered as a potential new method to study different porous materials of interest such as absorbents or catalysts supports.is characteristic of biological samples. This behavior of speckle pattern can also be observed in non-biological industrial processes, including the drying of paint, corrosion and heat exchange. The visual appearance of the speckle diagram is similar to that of a boiling liquid. This activity takes place when the sample changes its properties due to movement of the scattering centers, changes in the optical path due to variations of refractive index, configuration changes or combination of these situations. The study of the temporary evolution of the speckle patterns may provide an interesting tool to characterize the parameters involved in these processes. The present work shows the dynamic speckle application to the study of commercial silica-gel with different textural properties, i.e. grain size, superficial area and pore volume. The experimental results show the temporary evolution of the speckle patterns from the samples during the water absorption process. This technique enables the comparison between a variety of products and an eventually correlation with textural parameters. Besides, this analysis can be considered as a potential new method to study different porous materials of interest such as absorbents or catalysts supports.dynamic speckle application to the study of commercial silica-gel with different textural properties, i.e. grain size, superficial area and pore volume. The experimental results show the temporary evolution of the speckle patterns from the samples during the water absorption process. This technique enables the comparison between a variety of products and an eventually correlation with textural parameters. Besides, this analysis can be considered as a potential new method to study different porous materials of interest such as absorbents or catalysts supports.