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Optical and Electron Microscopy of Clusters of Nd3+:LaF3 Nanoparticles Synthesized by the HTMW Method
Physics of Wave Phenomena. 2023. Vol. 31. No. 3. P. 160–170.
G. O. Silaev, Krasheninnikov V., A. T. Shaidulin, Uvarov O., Orlovskaya E., Orlovskii Y., Yu. G. Vainer
A comparative study of the sizes and spatial structure of single dielectric colloidal nanoparticles of lanthanum fluoride, doped with rare-earth neodymium ions (Nd3+:LaF3), and their conglomerates in an aqueous solution has been performed. Nanoparticles were synthesized by aqueous co-precipitation method with subsequent hydrothermal microwave (HTMW) treatment. Experiments were performed using three methods: transmission electron microscopy (TEM), nanoparticle tracking analysis (NTA), and dynamic light scattering (DLS). An analysis of the results has shown that a stable colloidal solution of nanoparticles is formed during synthesis. The solution consists of single lanthanum fluoride nanoparticles, having a narrow (10–30 nm) size distribution, and nanoclusters formed on their basis. It is also shown that the spatial structure of nanoclusters cannot be described in terms of the fractal model, which is widely used to describe clusters formed in colloidal solutions of nanoparticles of various nature.
Keywords: trajectory analysisdynamic light scattering (DLS)динамическое рассеяние света (ДРС)анализ траекторий наночастиц (АТН)aqueous colloidal solutions of Nd3+: LaF3 nanocrystalshydrothermal microwave (HTMW) treatmentcolloidal clustersUltramicroscopeгидротермальный микроволновой (ГТМВ) синтезколлоидные кластерыУльтрамикроскопводные коллоидные растворы нанокристаллов Nd3+: LaF3
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We derive the local pressure tensor generated by the original Rosenfeld fundamental measure theory (FMT) for hard-sphere fluids from an arbitrary infinitesimal deformation. The variation of a finite-distance FMT kernel is written via the line integrals of the local deformation gradient along the straight segment connecting its end points. The resulting symmetric pressure tensor consists ...
Added: October 22, 2026
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Задача о возбуждении бегущих фонон-поляритонных волн на поверхности полярного кристалла падающей извне световой волной (с частотой, близкой к частоте решеточных колебаний) решена теоретически только для бесконечной открытой поверхности кристалла. В случаях, когда часть поверхности покрыта металлической маской, препятствующей проникновению возбуждающего излучения к атомам среды, и эта маска имеет произвольную форму, общепризнанного решения неоднородной задачи нет. ...
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Logvenkov S. A., Известия РАН. Механика жидкости и газа 2026 № 3 С. 59–75
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We study coherent electric manipulation of magnetic field induced localized states at a double kink of a helical edge in a HgTe/CdHgTe quantum well. An in-plane magnetic field opens a gap in the one-dimensional (1D) edge spectrum, while changes in the edge orientation generate localized in-gap states at the kinks. We show that, for suitable ...
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Equilibrium geometry parameters, harmonic vibrational frequencies and barriers to conformational transitions and conformer energy differences for N-methylacetamide (CH3CONHCH3) molecule in S0, S1 and T1 electronic states were calculated in MP2 (S0) and CASPT2 (S1, T1) levels of theory. It is known that there are two planar (or effectively planar) conformers of N-methylacetamide in the ground ...
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Added: October 14, 2026
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Added: October 14, 2026
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Added: October 14, 2026
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Added: October 14, 2026
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Added: October 14, 2026
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Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
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