issa mousazadeh moghaddampour

In terms of power density, supercapacitors exhibit excellent performance like conventional capacitors and high energy density like batteries. In addition, supercapacitors offer unprecedented applications and development prospects in the field of energy storage due to their fast charging, simple manufacturing technology, safety, and environmental compatibility. The use of supercapacitors is sometimes limited by the poor electrochemical performance and low cyclic stability of the electrode materials. To achieve very high performance and stability, which are crucial criteria for supercapacitor applications, the fabrication of nanostructured materials to improve the specific surface area and electrical conductivity is crucial. In the present work, a simple and economical hydrothermal route was used for the synthesis of Cu2SnS4 nanoparticles. The structure, chemical composition, and morphology of the synthesized materials were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), as well as X-ray energy diffraction (EDX), and elemental mapping to confirm the elemental composition of the prepared electrode. The electrode fabricated in this research was able to exhibit a high capacitance of 2076.9 F g-1 at a current density of 1 A g-1 and a stability of 90.44% after 10000 cycles. In addition, the asymmetric supercapacitor Cu2SnS4//AC provides a capacitance of 246.93 F g-1 at a current density of 1 A g-1 and a stability of 82.32% after 10000 cycles. The excellent electrochemical performances of Cu2SnS4 nanostructure will have significant technological applications in the future.

Nowadays, with the expansion of industries, the need to use industrial adhesives that can create new properties in the final sample while solving problems is felt more and more. Epoxy resins have the ability to be compatible with all kinds of nano fillers due to their extraordinary properties, in addition to providing proper thermal and mechanical resistance. In the present project, after preparing graphene oxide (GO) using the Hammers method and modifying it with the 1,'1-(hexane-1,6-diyl)bis(3-(3-(trimethoxysilyl)propyl)urea) silane modifier (HDBTMSPU), FGO was obtained. After the preparation of FGO, graphene xerogel (GX) was prepared by sol-gel reaction of FGO nanosheets with tetraethyl orthosilica (TEOS) and HDBTMSPU. Epoxy resin was chemically modified by oligomer TEOS and (3-isocyanatopropyl) triethoxysilane (IPTEOS). GX/epoxy nanocomposite (EGX) and silica/graphene/epoxy nanohybrid were prepared using TEOS, FGO and two types of TE and IE resins (TEGX, IEGX) through sol-gel reaction and their thermal properties were evaluated with EGX nanocomposite. The results of the FTIR, XPS and TGA tests showed that graphene and epoxy resin were successfully chemically modified. The structure of GX was investigated by Raman, XRD, SEM and TEM tests. The results obtained from the thermal decomposition test of graphene samples and nanocomposite samples demonstrated that after each step of GO chemical modification, the stability and thermal resistance of nanosheets increased significantly and the thermal properties of prepared nanocomposites were improved compared to epoxy resin.

Matcha, made from the finely ground powder of green tea leaves, is used as a nutritious food ingredient because of its unique properties. In this study, Matcha was characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction analysis (XRD), energy-dispersive X-ray spectroscopy (EDX). Also, the antimicrobial properties of Matcha against 8 types of bacteria, 1 type of fungus, and 1 type of yeast were investigated. The results showed that Matcha has a completely amorphous structure and has a high content of carbon and oxygen. The results of antibacterial tests showed that Matcha has the ability to inhibit gram-positive and gram-negative bacteria as well as yeast, but has no effect on the fungus. Also, Matcha has a greater effect on gram-positive bacteria, which is due to the simple and reasonably porous cell wall of these bacteria. According to the results, the maximum and minimum inhibition zones created by Matcha belonged to Pseudomonas aeruginosa and Escherichia coli, respectively.

In this work, we have successfully incorporated ginger particles into the sodium montmorillonite (Na+-MMT) structure. A new nanoparticles (G-MMT) were characterized using Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible-near infrared (UV-VIS-NIR), X-ray diffraction analysis (XRD), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Also, the antimicrobial properties of G-MMT nanoparticles were investigated using agar diffusion method. The results showed that the spherical particles of ginger were placed between the layers, and also slightly on the surface. Montmorillonite (MMT) layers, such as heat shields, protect the ginger from degradation. The results of antibacterial test showed that G-MMT inhibits 8 lethal types of gram-positive and gram-negative bacteria, as well as one type of yeast. Due to the antibacterial properties of G-MMT and the fact that ginger is protected at high temperatures, this nanoparticle can have a suitable place in various applications.