Formation kinetics of nanoparticles as the basis for simulating the generation mechanism of Liesegang rings in gels

Abstract

An approach has been proposed for determining the space-time parameters of the formation pro cess of Liesegang rings. This approach relates the processes of the formation of nanoparticles and dense peri odic precipitates from them. Dynamic light scattering is employed to reveal periodic variations in the inten sity of light scattered by nanoparticles with different sizes, from which Liesegang rings are formed. A relation ship between the periods of the variations in the intensity of light scattered by nanoparticles (microscopic process) and the times of the formation of Liesegang rings as a whole (macroscopic process) has been found.

D.I. Mendeleev’s concentration decrement in lucigenin aqueous solutions

“…Mendeleev's decrement is widely used in many fields of science to process the results of experiment. Mendeleev's decrement is important practical method to identify the characteristics of periodic physical and chemical processes, e.g., for the phenomenon "Liesegang rings" [9][10][11]. The Mendeleev's decrement was used in the article to process the data of luminescence spectra for labile aqueous solutions (Appendix 1).…”

ВЛИЯНИЕ ПРИРОДНОГО ПИГМЕНТА ЖИМОЛОСТИ НА ОПТИЧЕСКИЕ СВОЙСТВА НАНОЧАСТИЦ Au И Au/Ag, СТАБИЛИЗИРОВАННЫХ В ОБРАТНО МИЦЕЛЛЯРНЫХ РАСТВОРАХ

“…Формирование оксо-комплексов Qr с кислородом и участие лабильного тройного комплекса [nQr δ+ …mO 2 δ-…pMe + ] в качестве прекурсора НЧ доказано в работе [18]. Кинетика образования промежуточных комплексов и формирования НЧ Ag была исследована в работе [19]. В этой работе при изучении влияния ω (соответственно и концентрации соли в водном пуле ОМ) на кинетику формирования НЧ Ag была зарегистрирована полоса поглощения тройного комплекса [nQr δ+ …mO 2 δ-…pAg + ] для ОМР с наименьшим значением ω, равным 1.0 (представлена на рис.…”