Phosphineoxide-Chelated Europium(III) Nanoparticles for Ceftriaxone Detection

The present work demonstrates the optimization of the ligand structure in the series of bis(phosphine oxide) and β-ketophosphine oxide representatives for efficient coordination of Tb3+ and Eu3+ ions with the formation of the complexes exhibiting high Tb3+- and Eu3+-centered luminescence. The analysis of the stoichiometry and structure of the lanthanide complexes obtained using the XRD method reveals the great impact of the bridging group nature between two phosphine oxide moieties on the coordination mode of the ligands with Tb3+ and Eu3+ ions. The bridging imido-group facilitates the deprotonation of the imido- bis(phosphine oxide) ligand followed by the formation of tris-complexes. The spectral and PXRD analysis of the separated colloids indicates that the high stability of the tris-complexes provides their safe conversion into polystyrenesulfonate-stabilized colloids using the solvent exchange method. The red Eu3+-centered luminescence of the tris-complex exhibits the same specificity in the solutions and the colloids. The pronounced luminescent response on the antibiotic ceftriaxone allows for sensing the latter in aqueous solutions with an LOD value equal to 0.974 μM

The Enhancement of Productive Efficiency of the Press- Articles from Aluminum Alloys on the Operation Base of Thermal Conditions of the Extrusion

Приведены результаты исследования теплового взаимодействия в системе деформируемый металл - прессовый инструмент. Представлены аналитические зависимости определения температурных условий при дискретном прессовании сплошных и полых профилей, при полунепрерывном и непрерывном прессовании алюминиевых сплавов. Научно обосновано применение принудительного охлаждения прессового инструмента. Представлена методика оптимизации температурно-скоростных условий прессования с учетом реологических свойств деформируемого металла.The research results of the thermal interaction in the system deformed metal and press tool are made. The following analytical dependences of the definition the temperature conditions are presented: discrete extrusion of the solid and cored profiles; semi-continuous and continuous extrusion of aluminum alloys. The forced cooling application of the press tool is substantiated scientifically. The design procedure of the optimization of the temperature and speed conditions with a glance of the deformed metal rheology is presented

The Enhancement of Productive Efficiency of the Press- Articles from Aluminum Alloys on the Operation Base of Thermal Conditions of the Extrusion

Приведены результаты исследования теплового взаимодействия в системе деформируемый металл - прессовый инструмент. Представлены аналитические зависимости определения температурных условий при дискретном прессовании сплошных и полых профилей, при полунепрерывном и непрерывном прессовании алюминиевых сплавов. Научно обосновано применение принудительного охлаждения прессового инструмента. Представлена методика оптимизации температурно-скоростных условий прессования с учетом реологических свойств деформируемого металла.The research results of the thermal interaction in the system deformed metal and press tool are made. The following analytical dependences of the definition the temperature conditions are presented: discrete extrusion of the solid and cored profiles; semi-continuous and continuous extrusion of aluminum alloys. The forced cooling application of the press tool is substantiated scientifically. The design procedure of the optimization of the temperature and speed conditions with a glance of the deformed metal rheology is presented