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Author: search.filters.author.Boonyarattanakalin, KanokthipSubject: search.filters.subject.nanocomposite

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    The Effect of Polyvinyl Alcohol Addition on the Optical Properties and Oxygen Detection Performance of Titanium Dioxide and Methylene Blue Nanocomposite Colorimetric Indicators
    (2024-05-01)
    Boonyarattanakalin, Kanokthip
    ;
    Rattan, Praphaporn
    ;
    Songpanit, Maneerat
    ;
    Chutipaijit, Sutee
    ;
    Okumura, Hideyuki
    In this study, we investigated the impact of polyvinyl alcohol (PVA) incorporation on the optical properties and oxygen detection performance of a titanium dioxide/methylene blue (TiO<inf>2</inf>/MB) nanocomposite colorimetric indicator for packaging applications. The nanocomposite was synthesized via mechanical milling of TiO<inf>2</inf> nanoparticles with MB and citric acid. PVA, at varying concentrations (0, 3, 9, and 14 wt%), was introduced during the wet milling process to produce a homogeneous composite film. Spin coating was employed to fabricate TiO<inf>2</inf>/MB nanocomposite films for oxygen detection evaluation. The influence of PVA loading on the films’ chemical functionalities and surface morphologies was assessed using Fourier-transform infrared spectroscopy (FTIR) and field-emission scanning electron microscopy (FE-SEM). The indicator’s activation process, involving a color change between bleached and colored states, and its recovery time were monitored via optical imaging and UV-VIS-NIR spectrophotometry. The results revealed that a PVA content of 9 wt% yielded well-defined films with enhanced stability of the TiO<inf>2</inf>/MB nanocomposite’s oxygen detection performance.
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    Structural and Optical Characterizations of Polymethyl Methacrylate Films with the Incorporation of Ultrafine SiO2/TiO2 Composites Utilized as Self-Cleaning Surfaces
    (2023-08-01)
    Songpanit, Maneerat
    ;
    Boonyarattanakalin, Kanokthip
    ;
    Limwichean, Saksorn
    ;
    Lertvanithphol, Tossaporn
    ;
    Horprathum, Mati
    The structural and optical characterizations of nanocomposite films of polymethyl methacrylate (PMMA) and SiO<inf>2</inf>/TiO<inf>2</inf> composites prepared via the spin-coating technique were investigated using different SiO<inf>2</inf>:TiO<inf>2</inf> ratios. The SiO<inf>2</inf>/TiO<inf>2</inf> nanocomposites were synthesized using the sonochemical process with Si:Ti precursor ratios of 1:0.1, 1:0.5, 1:1, 1:2, 1:4, and 0:1. All characterizations of ultrafine SiO<inf>2</inf>/TiO<inf>2</inf> particles were loaded at 1 wt.% in a PMMA matrix for the fabrication of transparent SiO<inf>2</inf>/TiO<inf>2</inf>/PMMA composite films. The phase structure and morphology of SiO<inf>2</inf>/TiO<inf>2</inf>/PMMA composite films were monitored using X-ray diffraction, optical microscopy, and field-emission scanning electron microscopy. A surface roughness analysis of SiO<inf>2</inf>/TiO<inf>2</inf>/PMMA nanocomposite films was conducted using atomic force microscopy. For optical characterization, transmission properties with different incident angles of SiO<inf>2</inf>/TiO<inf>2</inf>/PMMA composite films were analyzed with UV-vis spectrophotometry. The water contact angles of SiO<inf>2</inf>/TiO<inf>2</inf>/PMMA composite films were analyzed to identify hydrophilic properties on film surfaces. Photocatalytic reactions in SiO<inf>2</inf>TiO<inf>2</inf> composite films under UV irradiation were evaluated using rhodamine B dye degradation. The optimal condition of SiO<inf>2</inf>/TiO<inf>2</inf>/PMMA nanocomposite films was obtained at a 1:1 SiO<inf>2</inf>:TiO<inf>2</inf> ratio in self-cleaning applications, resulting from good particle dispersion and the presence of the TiO<inf>2</inf> phase in the composite.