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  • Mesoporous SiO2 particles with chromophoric system and their use in indication of relative humidity [Elektronski vir]
    Švara Fabjan, Erika ...
    Mesoporous SiO2 particles with defined and ordered porosity (pore size 2%50 nm), high surface area, allowing variations in pore volumes and morphology with adjustable pore diameter, presents an ... interesting material with applications in various fields such as drug delivery, sensing and catalysis. Desired properties can be tuned by adjusting the synthesis parameters, such as pH, the type of the structure directing agent (surfactants and polymers), and temperature of reaction mixtures, choice of silica precursor, addition of swelling agents, etc. We have synthesized various mesoporous SiO2 materials with hexagonal arrangement of the pore channels, e.g., MCM-41 (Mobil Composition of Matter No. 41) and SBA-15 (Santa Barbara Amorphous) and with radial arrangement of pore channels. We further functionalized and treated the materials to incorporate chromophore-containing compounds into the mesoporous substrate obtaining a chromophoric system. The structural and morphological properties of the various mesoporous materials were characterized using electron microscopy (STEM), N2 physisorption and FT-IR spectroscopy. The water vapour sorption capabilities were determined gravimetrically using IGA-100 gravimetric analyzer. The change of colour was evaluated via measurement of CIELab colour space, performed before and after exposure of the materials to a range of environments containing air with different relative water vapour pressures. The synthesized materials exhibited different amounts of adsorbed water at specific water vapour pressures depending on the material properties. The physical reaction of chromophoric system with water in vapour phase are mainly dependent on the additional functionalization of the external surface of mesoporous substrate rather than the pore channel diameter according to the evaluation using the change of the colour of the incorporated chromophore.
    Vir: Book of abstracts [Elektronski vir] (Str. 170)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2019
    Jezik - angleški
    COBISS.SI-ID - 2488935

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