Browsing by Author "Saldias, C."

Now showing 1 - 4 of 4
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    A facile approach for tuning optical and surface properties of novel biobased Alginate/POTE handleable films via solvent vapor exposure
    (ELSEVIER, 2021) Mendez Lopez, M.; Ramos Hernandez, A.; Moreno Serna, V.; Bonardd, S.; Ramirez, O.; Silva, Hernan; Inostroza Rivera, Ricardo; Diaz, D. Diaz; Leiva, A.; Saldias, C.
    Novel biobased films consisting of alginate blends with poly (octanoic acid 2-thiophen-3-yl-ethyl ester) (POTE), a conducting polymer, were prepared by solution casting, and their optical, morphological, thermal, and surface properties were studied. Using UV-visible spectroscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM), the effects of tetrahydrofuran solvent vapors on the optical properties and surface morphology of biobased films with different POTE contents were studied. Results indicate that morphological rearrangements of POTE take place during the process of solvent exposure. Specifically, the solvent vapor induced the formation of POTE small crystalline domains, which allows envisioning the potential of tuning UV-visible absorbance and wettability behavior of biobased films. Finally, theoretical electronic calculations (specifically frontier molecular orbitals analysis) provided consistent evidence on POTE's preferential orientation and selectivity toward the THF-vapor medium.
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    In situ synthesis and immobilization of CuO nanoparticles in alginate-poly (amido amine) nanogels for photocatalytic applications
    (2022) Cordoba, A.; Duran, B.; Bonardd, S.; Diaz Diaz, D.; Leiva, A.; Saldias, C.
    Herein, we report a feasible approach for preparation of crosslinked alginate (Alg) and poly(amido amine) (PAMAM) nanogels (Alg-PAMAM NGs), using a water-in-oil-in-water (w/o/w) double emulsion route, via strong electrostatic interactions between anionic groups coming from alginate and previously incorporated Cu2+ ions. CuO nanoparticles (NPs) with average diameter about 65 nm were in situ obtained into Alg/PAMAM nanogels by treatment of embedded Cu2+ ions in NGs with NaBH4 at 25 degrees C under air atmosphere. The prepared Alg-PAMAM and Alg-PAMAM-CuO NGs were characterized using FT-IR and UV-visible spectroscopy, as well as scanning transmission electron microscopy (STEM). The presence of PAMAM dendrimers helped both to obtain structurally compact nanogels and an adequate stabilization of CuO NPs. Finally, the photocatalytic performance of the Alg-PAMAM-CuO NGs was tested via the decomposition of methyl orange in aqueous solution, under visible light irradiation.
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    New thiophene-based poly(azomethine)s bearing tetraphenylsilane moieties along their backbone. Optical, electronic, thermal properties and theoretical calculations
    (2020) Sobarzo Aucal, Patricio Antonio; Jessop Rivera, Ignacio; Mariman, A. P.; Gonzalez, A. F.; Saldias, C.; Schott Verdugo, Eduardo Enrique; Zarate, X.; Hauyón Sepúlveda, René Alejandro; Recabarren Gajardo, Gonzalo; Terraza Inostroza, Claudio; González Enríquez, Carmen; Tundidor Camba, Alain
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    Supramolecular Structures, Organization and Surface Behavior at Interfaces
    (2009) Gargallo Gómez, Ligia Teresita; Vargas, D.; Becerra, Natalia; Sandoval, C.; Saldias, C.; Leiva Campusano, Ángel; Radić Foschino, Deodato D.