Pulsed laser ablation (PLA) in liquid is advanced method for obtaining active nanoparticles in pure solvents without the use of chemical precursors. In this work, an original approach to the synthesis of complex oxides of bismuth and silicon (BSO) is proposed. The initial colloids obtained by PLA (Nd:YAG laser, 1064 nm, 7 ns) of Bi and Si targets in water were mixed and subjected to additional irradiation with the same laser parameters. Laser treatment stimulated the formation of complex oxides. Then the colloids were dried in air and nanopowders obtained were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-Vis spectroscopy. The photocatalytic activity of the materials was examined in the Rhodamine B degradation under LED source irradiation (375 nm).
We report on the fabrication of free-standing fluoropolymer composite films anisotropic in terms of THz photonic transmission. We used metallic Fe nanoparticles (80-110 nm diameter) obtained by the electric explosion as well as submicron (5 μm average) 5BDSR magnetic alloy particles two-step ground by a ball mill. These particles were dispersed in an acetone solution of the F42-l fluoropolymer. Upon casting, they could be oriented and assembled in alignment with an external magnetic field during solvent evaporation. Oriented composite films of such kind are considered as flexible polarizers with an irregular linear structure. Optical properties in the THz range of spectra were examined using a commercial THz-TDS T-Spec 1000, as well as a custom-made THz-TDS setup with a precise linear polarization of THz emission using a bunch of polarizer and analyzer. In addition, the optical properties of fabricated fluoropolymer composites are compared with copper foiled photoetched polyimide gratings with regular spacing. Irregular structure of magnetophoretic orientated 5BDSR fluoropolymer composites allows using them as ultra-wideband THz polarizers. Single-layer 5BDSR polarizer possesses an extinction ratio within 3:1 to 16:1 in the range of 0.2–2.4 THz.
This paper studies nonlinear optical properties of colloidal solutions obtained via pulsed laser ablation (PLA) of bulk targets of magnesium (Mg), bismuth (Bi), tin (Sn), and antimony (Sb) in water and ethanol. In this research Nd:YAG laser (1064 nm, 180 mJ, 7 ns, 20 Hz) was used as a radiation source. Nonlinear absorption and scattering of colloidal solutions were studied by direct nonlinear transmission (NLT) with power density in the range of 1-450 MW/cm2. Except for the solution obtained through the ablation of magnesium in water, all the samples exhibit a nonlinear decrease of transmission as a consequence of the increase of pumping power density. Along with this, the effect of nonlinear limitation of laser radiation depends on the type of particles and solvents.
In this work we fragmented of an aqueous suspension of a micron and submicron BSO particles sample via laser ablation. Also we carried out a comparative analysis of structure, phase composition, morphology, physicochemical and functional properties of materials before and after fragmentation. The results show that laser fragmentation leads to the formation of a homogeneous phase composition and better integration of bismuth in the bismuth silicate structure, as well as to an increase of photocatalytic properties of BSO during selective excitation in comparison with the initial material.
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