The formation of selenium nanoparticles by laser ablation of its target in pure water and water containing biocompatible surfactants has been experimentally investigated. Experiments were performed...

In this work, we investigated the effect of photoconversion covers based on ruby (chromium-doped alumina (Al₂O₃:Cr³⁺)) particles (PCC-R) on the growth and development of lettuce (Lactuca sativa) plants. Ruby particles (from 100 nm to 2 μm) were obtained by the sequential application of spall laser ablation and further laser fragmentation. The content of chromium ions relative to aluminum ions in the nanoparticles was 3.3 × 10⁻³. The covers with different densities of applied ruby particles (2 × 10⁷ m⁻² (PCC-R7), 2 × 10⁸ m⁻² (PCC-R8), 2 × 10⁹ m⁻² (PCC-R9)) were studied in the present work. The PCC-Rs had two wide bands of luminescence excitation. The first one was from 350 nm to 450 nm with a maximum at 405 nm, and the second one was from 500 nm to 600 nm with a peak at 550 nm. Synthesized covers emitted in the range of 650 nm to 750 nm, with a peak at 695 nm. It has been shown that PCC-R8, in contrast to PCC-R7 and PCC-R9, provided an increase in yield by 40% and was characterized by increased water use efficiency during dark respiration and assimilation of carbon dioxide in plants. It is assumed that the observed positive effect of PCC-R8 photoconversion covers is associated with the activation of regulatory mechanisms due to a qualitative change in the light spectrum.

Temporal and spectral characteristics of laser-induced breakdown plasma in colloidal solutions of gold nanoparticles were experimentally studied. Near-infrared laser sources of nanosecond pulses were...

Selenium is a trace indispensable element for the most living creatures functioning. The laser ablation in water technology was proposed for Se zero-valent state nanoparticles producing as fertilizers and antioxidants. The main Se nanoparticles mass part shifted from 800 nm correspondingly the laser fragmentation time to the size less than 500 nm. The resulting nanoparticles were