CONICET | Buscador de Institutos y Recursos Humanos

Scattering is a useful tool for the determination of particle size in solution. Particularly, spectroscopic analysis of backscattering renders the possibility of a simplified experimental setup and a direct data processing using Mie theory. We show that a simple technique based on near-infrared (NIR) backscattering spectroscopy together with the development of the corresponding algorithm based in Fourier transform (FT) and Mie theory, are a powerful tool for sizing microparticles in the range from 8 to 60 m diameter. There are three wavelength intervals in the NIR, within which different diameter ranges were analyzed. In each one of them, FT yields a coarse diameter value with an uncertainty dependent on the wavelength range. A more accurate value is obtained by further applying cross correlation between experimental and theoretical spectra. This latter step reduces the uncertainty in diameter determination between 30% and 40%, depending on wavelength interval and particle diameter. These results extend previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24 m of diameter. This technique may the basis for the construction of a portable and practical instrument. practical instrument. previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24 m of diameter. This technique may the basis for the construction of a portable and practical instrument. practical instrument. diameter. There are three wavelength intervals in the NIR, within which different diameter ranges were analyzed. In each one of them, FT yields a coarse diameter value with an uncertainty dependent on the wavelength range. A more accurate value is obtained by further applying cross correlation between experimental and theoretical spectra. This latter step reduces the uncertainty in diameter determination between 30% and 40%, depending on wavelength interval and particle diameter. These results extend previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24 m of diameter. This technique may the basis for the construction of a portable and practical instrument. practical instrument. previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24 m of diameter. This technique may the basis for the construction of a portable and practical instrument. practical instrument. m diameter. There are three wavelength intervals in the NIR, within which different diameter ranges were analyzed. In each one of them, FT yields a coarse diameter value with an uncertainty dependent on the wavelength range. A more accurate value is obtained by further applying cross correlation between experimental and theoretical spectra. This latter step reduces the uncertainty in diameter determination between 30% and 40%, depending on wavelength interval and particle diameter. These results extend previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24 m of diameter. This technique may the basis for the construction of a portable and practical instrument. practical instrument. previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24 m of diameter. This technique may the basis for the construction of a portable and practical instrument. practical instrument. % and 40%, depending on wavelength interval and particle diameter. These results extend previous information on visible backscattering spectroscopy applied to sizing microparticles in the range between 1 and 24 m of diameter. This technique may the basis for the construction of a portable and practical instrument. practical instrument. m of diameter. This technique may the basis for the construction of a portable and practical instrument.

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