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Your search keyword '"MEHRNIA, MOHAMMAD REZA"' showing total 251 results
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251 results on '"MEHRNIA, MOHAMMAD REZA"'

11. Morphological effects of spherical SiO2 and hexagonal mesoporous MCM‐41 nanoparticles in polyacrylonitrile mixed matrix membranes on the biofouling mitigation in short‐term filtration.

Author

Hashemi, Targol, Mehrnia, Mohammad Reza, and Pourafshari Chenar, Mahdi

Subjects
POLYACRYLONITRILES, SURFACE analysis, CONTACT angle, ATOMIC force microscopy, ULTRAFILTRATION, FOULING, SCANNING electron microscopes, REVERSE osmosis
Abstract

In this study, the morphology of the nanostructures is evaluated on the surface characterization and performance of the polyacrylonitrile (PAN) ultrafiltration mixed matrix membranes (MMM). To this end, silica nanoparticles (NPs) such as spherical (SiO2) and hexagonal mesoporous (MCM‐41) with high hydrophilicity were incorporated at 0.5, 1, and 2 wt%. Attenuated total reflectance‐Fourier transform infrared analysis illustrated the placement of NP on the surface of the MMM. Atomic force microscopy studies also showed that SiO2 NP added to PAN exhibited a smoother surface than MCM‐41 NP. Field‐emission scanning electron microscope analysis of the MMM identified that all membranes are composed of a finger‐like porous structure. Contact angle measurements indicate that the morphology of the NPs has no significant effect on MMM hydrophilicity. Moreover, the performance of the MMM was evaluated, and regardless of NP morphology, the MMM showed better permeate flux with increased loading. A higher pure water flux was observed in the PAN‐MCM41‐1% membrane (237 L/m2 h), possibly because of inherent porosity and high hydrophilicity of MCM‐41 compared to SiO2 NP. Further, the PAN‐SiO2‐1% membrane exhibited superior antifouling properties due to a lower surface roughness. The present studies reveal that the morphology of the NP greatly influence on the structure, permeation, and antifouling properties of PAN membranes. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Influence of magnetic casting on the permeability and anti‐fouling properties of a novel iron oxide/alumina/polysulfone mixed matrix membrane.

Author

Hashemi, Targol, Mehrnia, Mohammad Reza, Marandi, Aydin, and Ismail, Ahmad Fauzi

Subjects
MAGNETIC permeability, FERRIC oxide, FIELD emission electron microscopy, ATOMIC force microscopy, MAGNETIC nanoparticles, IRON oxides, ALUMINUM oxide
Abstract

Novel mixed matrix membranes (MMMs) were fabricated using Fe3O4, and Al2O3 nanoparticles (NPs) were added to the polysulfone (PSf) and N‐methylpyrrolidone (NMP) solution. The nanocomposite membranes were fabricated using the NIPS (non‐solvent induced phase separation) method. In order to create preferential permeation pathways for water across the MMMs, membrane formation is accomplished with an external magnetic field. Using magnetic casting cause the targeted placement of NPs in the best location and orientation. The performance of the prepared membranes was examined in terms of pure water flux and fouling parameters. Magnetic casting considerably increased pure water flux and decreased the total resistance of the optimum mixed matrix membrane, which contains 0.2% wt. of Fe3O4 NPs to 1175 L/m2h and 13.4 * 1011 (m−1), respectively. This is explained by the ordering of magnetic nanoparticles on the membrane sub‐layer cast under the magnetic field of 500 mT, which changed the sub‐layer structure. Less rough membrane surface of the mixed matrix membranes offered preferable anti‐fouling properties against fouling by BSA proteins. The characterization of fabricated membranes was carried out using field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), energy dispersive X‐ray (EDX), and water contact angle measurement methods. [ABSTRACT FROM AUTHOR]

Published
2023
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