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Laser ablation of silicon monoxide and titanium monoxide inliquid: formation of mixed colloidal dispersion with photocatalytic activity.
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SYSNO ASEP 0524940 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Laser ablation of silicon monoxide and titanium monoxide inliquid: formation of mixed colloidal dispersion with photocatalytic activity. Author(s) Vála, L. (CZ)
Vavruňková, V. (CZ)
Jandová, Věra (UCHP-M) RID, ORCID, SAI
Křenek, T. (CZ)Article number 012046 Source Title Journal of Physics: Conference Series, Book Series, 1527. - Bristol : IOP Publishing, 2020 - ISSN 1742-6588 Number of pages 7 s. Publication form Online - E Action International Conference on Rheology and Modeling of Materials (ic-rmm4) /4./ Event date 07.10.2019 - 11.10.2019 VEvent location Miskolcs Country HU - Hungary Event type EUR Language eng - English Country GB - United Kingdom Keywords titanium monoxide ; silicon monoxide ; laser ablation in liquid ; photocatalysis ; colloids Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry Institutional support UCHP-M - RVO:67985858 UT WOS 000593872300046 EID SCOPUS 85086828700 DOI 10.1088/1742-6596/1527/1/012046 Annotation Silica–titania mixed oxides and composites have been extensively studied, whereas to the titanium monoxide (TiO) –silicon monoxide (SiO) counterparts has been devoted very little attention. Laser ablation of SiO and TiO in liquids is in according with literature completely unexplored. Here we report on Nd:YAG pulse laser ablation of SiO and TiO in ethanol which allows generation of SiO- and TiO-based nanoparticles and their agglomerates. Mixed SiO-TiO colloid has been prepared by simple mixing of ablatively prepared individual colloids in 1:1 volume ratio. Measurement of size distribution by Dynamic Light Scattering (DLS) determines sizes of 24.85 nm and 262.3 nm for SiO colloid, 494.8 nm for TiO colloid and 35.2 nm and 397.5 nm for mixed colloid. Zeta potential values suggest incipient instability for all measured systems. Morphology of the particles captured on Ta substrate by evaporation of ethanol was studied using Scanning Electron Microscopy (SEM). Roundshaped, oval, and sheet-like particles and their agglomerates have been observed. Raman spectroscopy of the mixed SiO-TiO colloid revealed multiphase structure consisting of anatase and/or rutile, crystalline and amorphous silicon and silica and crystalline and amorphous titanium silicide TiSi2. Formation of TiSi2 demonstrates unexpected low temperature disproportionation of SiO and TiO-based species and mutual reducing interactions. Catalytic activity of individual SiO and TiO colloids and of their mixture has been tested in terms of methylene blue (MB) degradation under the daylight. TiO-SiO mixture exhibits higher solar-light catalytic activity compared to individual colloids which could by explain by the presence of highly photocatalytic TiSi2. These results represent potential of SiO and TiO reducing interactions which are favorable for generation of photocatalytic materials for water remediation. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2021 Electronic address https://iopscience.iop.org/article/10.1088/1742-6596/1527/1/012046
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