Rusinchuk N. Near-field interaction between the nanoparticles and nanostructures surfaces

The work is devoted to theoretical and experimental study of the near-field interaction in nanosystem consisted of various nanoparticles and surfaces included nanostructured ones. The goal of the work is development of convenient for practical use and realistic models of interaction between the nanoparticles and nanostructured surfaces for calculation of the adsorption potential and local field distribution in the system. The review and analysis of existed information on mechanism of formation of the interactions in the nano-sized systems, existed approaches to their description and the methods underlying the existing models have been performed. The simple theoretical models for analysis of the near-field interaction between two nanoparticles, the nanoparticle and the surface, which take into account the nonlinear polarizability, shape, size, material and structure of the objects and allow obtaining realistic results have been proposed. The work consists of detailed description of the main parameters, assumptions and simplifications used in the model. It has been shown that taking into account the nanoparticle shell is important in the study of nanoscale systems. It has been demonstrated that description of the interactions in nanosystems of more than two nanoparticles and in systems with the nanostructured surfaces can be simplified. It is possible as the near-field interaction is significant only at short distances between the objects. It has been shown that based on the available experimental data and theoretical calculations of this work, a condition for the smallness of the interaction between the nanoobjects can be proposed. The application of the condition makes it possible to simplify the theoretical modeling of multiparticle systems. The proposed condition was verified by the experimental results available in the literature. It has been shown that from the physical point of view, the virus can be described as a nanoparticle, and the ideas of near-field interaction can explain the antiviral effect of nanoparticles and nanostructured surfaces. It has also been shown that the proposed models allow explaining and predicting the results of many experiments