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Information × Registration Number 0224U031772, 0122U001697 , R & D reports Title Features of interaction of viruses and microbes with nanoparticles and nanostructured surfaces in the conditions of plasmon resonance popup.stage_title Head Lozovskyi Valerii Z., Доктор фізико-математичних наук Registration Date 13-06-2024 Organization Taras Shevchenko National University of Kyiv popup.description2 A theoretical analysis of the stability of colloidal solutions of nanoparticles showed that when nanoparticles with an average radius of 100 nm are almost completely aggregated, there may be no significant changes in colloids with small nanoparticles (less than 10 nm), which is in good agreement with experimental results. That is, colloidal solutions of nanoparticles of small sizes are more stable and, as a result, plasmon resonances can be observed in such solutions for a long time as long as the solution maintains its stability. The recovery of silver ions and stabilization of nanoparticles by quercetin molecules by chemical (NaBH4), thermal (at 90o C) and photochemical methods at different quantitative ratios of "flavonoid: nanoparticle" has been studied, showing high efficiency of the process of nanoparticle formation during thermal activation. Photoactivation of nanoparticle formation proceeds more effectively in the presence of quercetin. The average size of nanoparticles obtained by chemical reduction does not exceed 10 nm, and those obtained by thermal and photocatalytic methods are in the range of 50-90 nm. The interaction of flavonoids with silver nanoparticles and the formation of a shell around the nanoparticles is accompanied by the formation of complexes of molecules with silver ions released from the surface of the nanoparticles. Silver nanoparticles enhance the fluorescence of quercetin, due to the plasmon effect and increased efficiency of resonant energy transfer in the quercetin-nanoparticle system near the nanoparticle surface. It was established that external irradiation in the conditions of surface plasmon resonance enhances the effect of silver nanoparticles on the growth of the S. aureus test culture. When the test sample is irradiated, the bacterial population decreases by 33 % compared to the control. The obtained results indicate that the viability of bacteria depends on the morphology and plasmonic properties of silver nanoparticles.   Product Description popup.authors Babiychuk Mariia В. Vasyliev Anatolii H. Zavertanyi Taras L. Kryvokhyzha Kostiantyn V. Manilov Anton І. Petryk Iryna S. Rybalchenko Nataliia P. Stuzhuk Elizaveta S. popup.nrat_date 2024-06-13 Close