Tesis Magíster

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Browsing Tesis Magíster by Subject "Agricultura de precisión - Chile"

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    Tecnología de burbujas finas y ultrafinas: actuales y potenciales aplicaciones en el área agroindustrial.
    (Universidad de Concepción, 2020) Vásquez Benavides, María Ignacia Margarita; Cañumir Veas, Juan Antonio
    In recent years, great efforts have been made to find an ideal method for the characterization of fine bubbles (FB) and ultrafine bubbles (UFB). In this investigation, two technologies were applied to characterize the bubbles: dynamic light scattering (DLS) and transmitted light microscopy. The characterization by using DLS evidenced the presence of another particles in suspension other than bubbles, however, it was possible to demonstrate the presence of the FB and UFB, thanks to the differences between blank samples and bubble samples. In general, there was a tendency to increase the diameter of the bubbles over time. A slight change in pH did not show significant differences in the results. The ζ potential (zeta potential) results, showed erratic behavior, but the existence of negatively charged suspended bubbles was verified. By using transmitted light microscopy, the existence of FB and UFB, naturally found in the UPW-Methylene blue control sample was discovered, of which 98% corresponded to diameters less than 1 μm. On the other hand, a higher concentration of bubbles was found in the UFB-Methylene blue sample, of which 94% corresponded to diameters less than 1 um. The applications of BF and BUF that have been reported in recent years, in different areas of science, can be extrapolated to the agroindustrial area.
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