Приведены результаты экспериментального синтеза системы микросвитков диоксида титана с Au наночастицами, полученные оригинальным трехэтапным методом синтеза. Приведена оценка размеров и фрактальных размерностей полученных образцов. Для описания структуры полученных образцов предложена имитационная модель в приближении клеточного автомата и диффузионно-ограниченной агрегации в рамках окрестности Неймана. Предложена модель торцевого сечения микросвитка в приближении спирали Архимеда с учетом шероховатости, определяемой в рамках диффузионного приближения, реализованного с использованием техники клеточного автомата. Для описания массива микросвитков применялось приближение диффузионно-ограниченной агрегации. Полученные величины погрешности моделирования свидетельствовали о применимости предложенных моделей для описания систем микросвитков в первом приближении. The results of the experimental synthesis of a system of titanium dioxide micro-scrolls with Au nanoparticles obtained by the original three-stage synthesis method are presented. An estimate of the sizes and fractal dimensions of the obtained samples is given. To describe the structure of the obtained samples, a simulation model is proposed in the approximation of a cellular automaton and diffusion-limited aggregation within the Neumann neighborhood. A model of the end section of a microscroll in the Archimedes spiral approximation is proposed, taking into account the roughness determined within the framework of the diffusion approximation implemented using the cellular automaton technique. The diffusion-limited aggregation approximation was used to describe the array of micro-scrolls. The obtained values of the modeling error indicated the applicability of the proposed models to describe microsсroll systems in the first approximation.

This paper demonstrates a method for creating metasurfaces based on titanium dioxide, which can be used to design photosensitive elements capable of converting solar energy into electricity. This is possible due to the developed method, which allows you to form a surface with a given frequency. The introduction of metallic nanoparticles into the titanium dioxide matrix makes it possible to enhance the absorption effect of the visible radiation spectrum, and linear carbon chains provide electronic transport over the surface.

Предложена имитационная феноменологическая модель структуры лазерно-индуцированных графитизированных областей в искусственном алмазе во фрактальном приближении, реализованные с использованием клеточного автомата с окрестностью Неймана. Рассмотрены модели для изотермических и неизотермических расчетных областей, для которых поле температуры оценивалось с использованием MatlabLaserToolbox. Такой учет температуры в основном модельном параметре (вероятности области стать графитизированной) позволяет опосредованно соотносить модельные параметры и параметры реальной схемы синтеза. Для моделирования системы дефектов в искусственном алмазе, от которых начинался процесс графитизации, предложена имитационная модель диффузионно-ограниченной агрегации. Приведена оценка размеров и фрактальных размерностей полученных в эксперименте образцов и моделей, показавшая хорошую адекватность предложенных приближений. Электрофизические свойства моделировались применительно к электропроводимости графитированных областей на основе фрактального подхода и сравнивались с измеренными значениями. Проведенное сравнение продемонстрировало применимость предложенной модели для описания электропроводимости графитированных областей. Таким образом, предложенных подход позволяет в первом приближении описать структурные особенности и обусловленные ими электрофизические свойства лазерно-индуцированных графитизированных структур в искусственном алмазе. A simulation phenomenological model of the structure of laser-induced graphitized regions in artificial diamond in a fractal approximation is proposed, implemented using a cellular automaton with a Neumann neighborhood. Models for isothermal and non-isothermal computational domains for which the temperature field was estimated using MatlabLaserToolbox are considered. Such consideration of temperature in the main model parameter (the probability of the region becoming graphitized) allows us to indirectly correlate model parameters and parameters of the real synthesis scheme. To simulate the system of defects in artificial diamond, from which the graphitization process began, a simulation model of diffusion-limited aggregation is proposed. An estimate of the sizes and fractal dimensions of the samples and models obtained in the experiment is given, which showed the good adequacy of the proposed approximations. The electrophysical properties were modeled in relation to the electrical conductivity of graphitized regions based on a fractal approach and compared with the measured values. The comparison demonstrated the applicability of the proposed model to describe the electrical conductivity of graphitized regions. Thus, the proposed approach allows us to describe the structural features and the electrophysical properties of laser-induced graphitized structures in artificial diamond in the first approximation.

In this study, we investigate stable elongated carbon chains synthesized using the laser fragmentation technique in a colloidal solution. These chains are mechanically stabilized through the electron binding of the carbon chains to gold nanoparticles. Due to the high degree of alignment of gold-terminated carbyne chains, a strongly anisotropic light absorption is observed, characterized by a cosine dependence on the angle between the carbyne molecule and the polarization plane of excitation.

A fractal approach is proposed for modeling systems of PbTe nanoclusters on a solid surface. The systems under consideration were generated by solid-phase laser modification. For the obtained samples, their fractal dimension was estimated. In accordance with the proximity to it, the corresponding chaotic fractal structures were selected.

Nanocomposite thin films based on Al-Si alloy with the addition of boron carbide (B4C) particles are widely used in various fields of modern high-tech industry. For their synthesis, the method of laser nanomodification was used, which made it possible to obtain samples with a dendritic structure. The parameters of laser radiation were selected on the basis of preliminary modeling of the temperature field of the system. To describe the ensemble of nanodendrites on the surface, we used modeling of their structure in variable phase field and temperature for the initial stages, as well as the approximation of diffusion-limited aggregation and fractal Brownian motion for subsequent time intervals. The model showed satisfactory adequacy, estimated on the basis of the ratio of fractal dimensions of experimental and model structures. The proposed approach can be useful for predicting the structure of nanomodified aluminum alloys with various additions.

The results of experimental studies of the production of metal nanoclusters in colloidal solutions are presented. Models based on the Smoluchowski equation for concentrations of nanoparticles of various sizes, as well as a model of cluster-cluster aggregation, are proposed, which can be useful in studying the processes of nanocluster formation in colloidal solutions.

Abstract The article discusses the experimental results of the fractal metallic island nanofilms elaboration and their modeling in the DLA approximation. There is also presented the simulation of their optical properties using the Monte Carlo method and the scattering intensity, based on the fractal characteristics.

This paper describes a computer model for the formation of thin films by sedimentation of colloidal particles with allowance for surface diffusion with various methods of self-organization. The process of organizing such films similar to the free fall of identical balls that form an organized structure. Understanding the self-assembly mechanisms of nanoparticles is an important step in the direction of creating new materials with regard to optical and electrical properties.

The paper discusses experimental and modeled characteristics of the electrical conductivity of PbTe island films. The volt-ampere characteristics were measured using a four-contact circuit. The hopping conductivity was modeled as the Miller-Abraham network. Using the proposed approach, calculations were made for a network of 100 particles with a variation in the parameter value corresponding to the temperature.