Arak UniversityColloid & Nanoscience Journal2980-92152220241101Silver nanoparticles prepared by colloid assisted biofabrication methodology using soilless-grown Moringa oleifera in Armenia27027671779210.61186/CNJ.2.2.270ENAnnaTadevosyanInstitute of Hydroponics Problems
Laboratory of Plant Nourishment and Productivity
National Academy of Sciences Republic of Armenia
Yerevan 0082, 108 NoragyughMahsaDaryadarInstitute of Hydroponics Problems
Laboratory of Plant Nourishment and Productivity
National Academy of Sciences Republic of Armenia
Yerevan 0082, 108 Noragyugh0000-0002-4903-9366AnahitTovmasyanInstitute of Hydroponics Problems
Laboratory of Plant Nourishment and Productivity
National Academy of Sciences Republic of Armenia
Yerevan 0082, 108 NoragyughArmineAsatryanInstitute of Hydroponics Problems
Laboratory of Plant Nourishment and Productivity
National Academy of Sciences Republic of Armenia
Yerevan 0082, 108 NoragyughAnahitHakobjanianInstitute of Hydroponics Problems
Laboratory of Plant Nourishment and Productivity
National Academy of Sciences Republic of Armenia
Yerevan 0082, 108 NoragyughJournal Article20241010In this study, green synthesis assisted colloidal solution system was used to prepare monodispersed spherical silver nanoparticles from hydroponic Moringa oleifera Lam. leaf extract. The Moringa oleifera leaf extract used has shown great potential in the biosynthesis of silver nanoparticles for medicinal and biotechnological applications. The formation of silver nanoparticles was observed by UV-Vis spectroscopy with a surface plasmon resonance band at 425 nm after 1 hour of preparation. Transmission electron microscopy (TEM) imaging shows that the nanoparticles are spherical in shape with an average size of 20 nm. The atomic force microscopy (AFM) image showed that the Ag nanoparticles were spherical with good monodispersity, confirming the TEM results. The biomedical use of the green synthesized silver nanoparticles from medicinal plants as antimicrobial and cytotoxic agents can be suggested by their strong bioactivity and synergistic effect of Moringa oleifera and silver nanoparticles.https://cnj.araku.ac.ir/article_717792_14a7138a745714f87c0a9f674f9672e6.pdfArak UniversityColloid & Nanoscience Journal2980-92152220241101Enhancing methyl orange photodegradation over a reusable Ag-TiO2/SBA-15 nanocomposite27728771780210.61186/CNJ.2.2.277ENAlirezaYadegariDepartment of Chemical Engineering, Arak Branch, Islamic Azad University, Arak, IranMahmoudSalimiDepartment of Chemical Engineering, Arak Branch, Islamic Azad University, Arak, IranJournal Article20241016Currently, wastewater treatment is an industrial opportunity to rejuvenate freshwater resources. It is highly needed in water-stressed countries. This work presents a one-step microwave-assisted hydrothermal method for making Ag-TiO2/SBA-15 nanophotocatalysts. XRD, N2 adsorption-desorption isotherms-desorption isotherms, AFM, UV-Vis, and UV-DRS analyses were carried out to characterize the obtained photocatalyst sample. With high Ag loading on the surface of TiO2 nanoparticles, agglomeration of silver nanoparticles and also clogging occurring in the SBA-15 pores are confirmed by AFM analysis. The optical bandgap energies obtained by DRS analysis were significantly blue-shifted, which is the quantization effects improving photocatalytic activities under visible light illumination due to the presence of silver nanoparticles that act as photosensitizer and reduce the recombination of the formed charge carriers (e and hole). Photocatalytic performances of Ag-TiO2/SBA-15 nanophotocatalyst were evaluated by methyl orange (MO) dye photodegradation at different Ag/TiO2 ratios. In MO destruction experiments, the highest photocatalytic efficiency was obtained in the Ag/TiO2-SBA-15 (Ag: TiO2=1.0) photocatalyst at 76.0% and all efficiencies over the synthesized nano photocatalysts are higher than commercial bulk TiO2 nano photocatalyst activity due to the low UV part of the applied visible light halogen lamp and also Ag/TiO2 nano photocatalyst that maybe due to the poor dispersion of active phases. The Ag-TiO2/SBA-15 (1.0) had the highest photocatalytic efficiency at pH=4. The photocatalyst can be reused six times without losing its effectiveness. This shows that the photocatalyst is stable and can be used repeatedly.https://cnj.araku.ac.ir/article_717802_ca99cc0408438189513a8527b91fe70e.pdfArak UniversityColloid & Nanoscience Journal2980-92152220241101Ionic conductivity investigation of [bmim]Cl/polystyrene film as polymer electrolyte prepared by a versatile ionic liquid based microemulsion method28829571752710.61186/CNJ.2.2.288ENSamiraSohrabnezhadDepartment of Chemistry, Faculty of Science, Lorestan University, Khoramabad, IranJournal Article20241011Due to their surprising properties, ionic liquids (ILs) are attracting considerable attention in many areas of chemistry and industry. Among these properties, ILs can play an important role in polymer electrolytes due to their excellent ionic conductivity up to their decomposition temperature. In this study, IL/poly(methyl methacrylate) composites were prepared as a polymer electrolyte with excellent ionic conductivity in IL-based microemulsion. Hydrophilic ionic liquid, [bmim]Cl), was used to prepare the IL/polymer composite. The [bmim]Cl/polystyrene membrane composite was characterized by AFM technique. After the addition of 2.5 wt.% [bmim]Cl in the microemulsion formulation, at 150 °C produced [bmim]Cl/polystyrene with the highest ionic conductivity, 5.7 × 10-3 S/cm. It was concluded that the addition of hydrophylic [bmim]Cl ionic liquid increased ionic conductivity and interface stability at the solid [bmim]Cl/polystyrene film. The resulting IL/polymer composites shouldhave potential as polymer electrolytes and can be used in fuel cell.https://cnj.araku.ac.ir/article_717527_370ce070f0e88b77ef1aa1a8a21bb910.pdfArak UniversityColloid & Nanoscience Journal2980-92152220241101High antimicrobial activity of new eco‐friendly and biocompatible nanocomposite based on the AgCl-decorated poly(sodium acrylate) cryogel29630371756910.61186/CNJ.2.2.296ENElhamYadegariIsfahan University of Medical Sciences, School of Pharmacy and Pharmaceutical Science, 8174673461, Isfahan, IranSajedehAbediDepartment of chemistry, Payame noor University, Arak, IranAmirhoseinKhademiFaculty of Medical Science, Islamic Azad University of Khomein, Khomein, IranJournal Article20241029This study addresses the preparation of antibacterial agent-decorated cryogels, AgCl nanoparticles-decorated poly(sodium acrylate) (AgCl/PSA) cryogel at different AgCl Wt.%, and their antibacterial application investigation. Cryogels are formed by conducting a polymerization reaction in a semi-frozen system where the ice crystals (for aqueous systems) act as the porogens, resulting in a highly interconnected porous network. The prepared samples were characterized with XRD, AFM, and SEM. AFM images show that the AgCl nanoparticles concentration decorated on the surface of PSA cryogel influenced the surface topography of cryogel nanocomposites. Escherichia coli and Bacillus subtilis were selected as exemplary gram-negative and gram-positive bacteria for antibacterial testing. The prepared cryogel nanocomposite samples showed a 4.5-7.0 log reduction of viable bacteria in the antibacterial test. The PSA/AgCl-10 cryogel as the best sample was also highly reusable over six cycles of antibacterial test operation. Due to their simple operation, ease of deployment, and high antibacterial performance, the synthesized AgCl-decorated cryogels offer great promise for different applications.https://cnj.araku.ac.ir/article_717569_1d3a76c27dacd39359bcd75132f1b3c0.pdfArak UniversityColloid & Nanoscience Journal2980-92152220241101Surface modification of polyethersulfone nanofiltration membranes by nanocomposite Layer containing POSS nanoparticles30432071757210.61186/CNJ.2.2.304ENAbdolrezaMoghadassiDepartment of Chemical Engineering, Arak university, Arak 38156-8-8349, Iran0000-0003-0733-4540MaryamGhafariDepartment of Chemical Engineering, Arak university, Arak 38156-8-8349, IranSamanehBandehaliDepartment of Mechanical Engineering, Ayatollah Boroujerdi University, Boroujerd 69199-69737, IranNarjesRabiei KarahroudiDepartment of Chemical Engineering, Arak university, Arak 38156-8-8349, IranJournal Article20241030In this study, the Surface of polyethersulfone nanofiltration membranes was modified by a nanocomposite Layer containing POSS nanoparticles. The effect of the Surface modification, on the structure, separation, and other properties of the membranes was checked. Pristine membranes were prepared by the phase inversion method. The surface of the membrane was modified by the dip coating method. Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) analysis, and scanning electron microscopy (SEM), were applied in membrane characterization. Moreover, Pure water flux, salt rejection, membrane porosity, mean pore size of the membrane, water content, and water contact angle were applied to evaluate membranes. The FTIR results proved the creation of a nanocomposite layer with the POSS nanoparticles on the surface of the virginal membrane. SEM images confirmed that a new layer was uniformly present on the surface of the modified membranes. The amount of water content for double-layer membranes had an increasing trend compared to pristine membranes, also, the results of the contact angle showed a decrease in the surface roughness for the modified membranes then with increasing concentration of glycidyl-pass nanoparticles, that is a hydrophobic substance, went through a decreasing trend. By increasing Acrylic Acid, the porosity was enhanced but after utilizing glycidyl-pass nanoparticles, it showed a decreasing trend. Also, the pure water flux showed a decreasing trend. The rate of return had an increasing trend for the membranes. The addition of glycidyl-pass nanoparticles up to 0.1% by weight resulted in the yield of 59.74% Na2SO4 and 64% for CrSO4.https://cnj.araku.ac.ir/article_717572_45ad0423174fb59b8fca623238b55a6c.pdfArak UniversityColloid & Nanoscience Journal2980-92152220241101Pluronic F127 stabilized ZnO nanofluid; Investigation of the dispersion stability and thermal conductivity32132771786710.61186/CNJ.2.2.321ENAliKhademiDepartment of Chemistry, College of Science, University of Tehran, Tehran 14155-6455, Iran0000-0002-0958-3252AmirhoseinAmirimajedFaculty of
Chemistry and Petroleum Sciences,
Shahid Beheshti University, Tehran, IranAliSamadzadehDepartment of Chemistry, Shahid Bahonar University, Kerman, IranJournal Article20241027Nanofluids are suspensions consisting of solid nanoparticles in sizes less than 100 nm and can be used in many research fields. The current research work concentrated on two sections. (1) This part mainly studies the preparation and characterization and colloidal stability of surface modified ZnO nanoparticles disbanded water (ZnO/water) nanofluid (2) estimating thermal conductivity, which was essential for many industrial applications. To study the stability of the F127 stabilized ZnO nanofluid, DLS and zeta potential analysis were used. The polydispersity index, as determined by DLS analysis, is 0.322, and the number-averaged particle size is 110 nm. To achieve this, the dispersant was used for homogeneous solution and the zeta potential value for stabilized ZnO nanofluids in the presence of dispersant was 10.18 mV. The effect of dispersant and temperature on the thermal conductivity of nanofluids was examined. Based on the obtained results, a significant increase in fluid conductivity was observed that had a nonlinear relationship with the volume fraction and an optimized dispersant concentration at 1.5 vol% showed the maximum enhancement of thermal conductivity. The influence of temperature on the thermal conductivity of ZnO stabilized nanofluids was analyzed and compared with ZnO nanofluids.https://cnj.araku.ac.ir/article_717867_20b2c9cb39bfb08f96695d464f94b171.pdf