Journal of Interface, Thin Film and Low Dimension Systems
Volume:8 Issue: 1, Summer-Autumn 2024

In this article, the bandgap of the two-dimensional phononic crystal with some holes in a square plane was studied using the finite element method in the Comsol software. The holes are made of both some solids and liquids simultaneously in our phononic crystals that is less studied so far. We examined the fixed lattice constant while the cavity radius changes and vice versa. We found a larger bandgaps width when the cavity was made of nickel metal while the surrounding media is water. We; observed that the system with higher sound speed possesses more significant band gap.At higher temperatures, we will have a higher sound speed, and thus, a higher bandgap width. we have a smaller bandgap when the holes are covered by metal. The main aim of the manuscript was to find an optimum structure that have a phononic crystal with largest passible phononic band gap for filtering properties applications. In this way, we have considered the effect of different parameters such as lattice constant, composing materials, phononic crystal geometry, temperature on the phononic bandgap width.

In this article, a nickel-based elliptical cylinder plasmonic Nano-waveguide (NECPNW), layers is used to serve the coating purpose. The results of this purposed structure that are yielded by Finite Element Method in the COMSOL-multi-physics simulator program reflect that this approach has the capacity for more field confinement and simultaneously less dissipation. As a result, surface plasmons (SPs) can be utilized to improve data exchange. Our resulting has displayed that the proposed waveguide has a figure of merit over 35000, propagation length over 470 μm, and a normalized mode area of ∼〖10〗^(-3) by tuning the semi-major axis Ni nanowire, wavelength of incident light, and the thickness of the dielectric layers. Hence, proposed waveguide shows longer propagation length and better figure of merit than the similar plasmonic waveguides.

he presence of nanoparticles enhances heat transfer in heat exchangers. The degree of enhancement depends on the type, size, and shape of nanoparticles, as well as temperature conditions. Therefore, this study aims to improve thermal conductivity in a hybrid nanofluid by incorporating a nanocomposite. Due to their high thermal conductivity, spherical-shaped silver nanoparticles are suitable for synthesizing composites with cylindrical-shaped functionalized multi-wall carbon nanotubes.  The characteristics of the synthesized nanocomposite were investigated via UV-Vis spectrophotometer, SEM, and TEM analyses. Also, the effects of Ag concentrations and temperature on thermal conductivity were investigated. The thermal conductivity can be enhanced by 15%, increasing Ag concentration from 0.05-0.5 wt.% and temperature in the 20-45 C range. The stability of the synthesized MWCNT/Ag nanofluid was evaluated after more than 90 days. The results indicated that the nanofluids with lower concentrations of Ag nanoparticles preserved their stability without using a surfactant.

This article presents a method for producing silver nanoparticles through plasma at atmospheric pressure using electrochemical techniques. Initially, an electrochemical configuration is designed using atmospheric pressure plasma (a direct current (DC) source). Subsequently, silver nanoparticles were produced in an environment without a stabilizer and evaluated according to the treatment time. The results demonstrate that the plasma-based electrochemical method, in comparison to other methods, including traditional electrochemical, can increase the accuracy in the shape and structure of nanoparticles while simultaneously accelerating the synthesized processes of nanomaterials. Analysis revealed that the synthesized nanostructures range between 2 and 3 nanometers in size and exhibit rod-like shapes, among other morphologies.

Diamond structure were deposited on gold coated Si substrate successfully using DC-PECVD technique at different CH4 /H2 in the reactant gases (CH4/H2 = 2, 5 and 7 vol. %). Characterization of diamond structure has been investigated in detail by X-ray diffraction (XRD), Raman spectroscopy (RS), atomic force microscopy (AFM) and scanning electron microscopy (SEM). The results determined the effect of the different CH4 /H2 in the reactant gases on the crystallinity, phase, surface morphology and microstructure. The XRD patterns showed polycrystalline structure with diamond (111) preferred growth orientation and better crystalline quality at middle methane concentrations. The first order Raman peak for diamond phase was more intense at middle methane concentrations, while a relatively broad G-band from the graphitic species was appearance. Diamond structures with large grain sizes in the micron or tens of micron range have homogenous surface.

This paper presents a detailed investigation into the quantum entanglement dynamics of a qubit-qubit compound system, specifically exploring its behavior within the framework of both the isotropic XXX Heisenberg model and the anisotropic XYZ model. The analysis also considers the presence of Dzyaloshinskii-Moriya interaction, particularly in the context of external magnetic fields. For the study, the initial state of the system is assumed to be a spin coherence state, which serves as a crucial starting point for understanding the entanglement properties. The dynamics of entanglement in this compound system are thoroughly analyzed using the negativity criterion, which is employed as a measure of entanglement. This approach allows for a comprehensive assessment of how the Dzyaloshinskii-Moriya interaction and varying magnetic fields influence the entanglement dynamics throughout the evolution of the system.