Arak UniversityColloid & Nanoscience Journal2980-92154220260701Nanofluid-induced alterations in reservoir geomechanics and their impact on enhanced ril Recovery: a Comprehensive review737332ENAliAkbariDepartment of Petroleum Engineering, Kho.C., Islamic Azad University, Khomeinishahr, Iran0009-0006-0004-4224MojtabaRahimiDepartment of Petroleum Engineering, Kho.C., Islamic Azad University, Khomeinishahr, Iran; Stone Research Center, Kho.C., Islamic Azad University, Khomeinishahr, Iran0000-0002-2567-0508Journal Article20260210Nanofluids have shown great potential in enhanced oil recovery (EOR) by reducing interfacial tension (IFT) and altering wettability. However, their impact on reservoir geomechanics—stress redistribution, pore pressure, and rock deformation—has received limited attention. This review systematically examines nanofluid-assisted EOR from an integrated physicochemical and geomechanical perspective, covering research from 2007 to 2025. Key nanoparticles (silica, alumina, carbon-based) and preparation methods (single-step vs. two-step) are analyzed in terms of their effects on porosity, permeability, compressibility, and fracture stability. Unlike previous reviews that focus solely on EOR mechanisms, this work presents a systematic integration of nanofluid behavior with reservoir geomechanics. The novelty lies in bridging these two domains to establish a framework for designing mechanically stable EOR operations. Critical knowledge gaps are identified, including long-term nanoparticle (NPs) stability, field-scale geomechanical data, and coupled hydro-mechanical modeling needs. Overall, this review provides actionable insights for sustainable and reservoir-integrity-aware nanofluid applications in the petroleum industry.Arak UniversityColloid & Nanoscience Journal2980-92154220260701Using green-synthesized nanoparticles in the preparation of polyvinyl chloride-based nanocomposite membranes with antibacterial activity in aqueous solutions737333ENAlirezaKhodabakhshiDepartment of Chemistry, Faculty of Science, Arak University, Arak , IranMajidKomeijaniDepartment of Biology, Faculty of Science, Arak University, Arak 38156-8-8349, IranRezaGalavandDepartment of Chemistry, Faculty of Science, Arak University, Arak , IranJournal Article20251114Metal nanoparticles are generally prepared through chemical and physical reactions, which are mostly expensive. There are many concerns about environmental and biological contamination caused by current nanoparticle production conditions in the long term. In response to this challenge, today, the approach of some research is directed towards the synthesis of nanoparticles using biological systems (biological method). In these methods, the ionic state of the metal is used to produce nanoparticles. Lower cost, reduced production of pollutants, and maintaining environmental safety for human health are the advantages of green synthesis over conventional nanoparticle synthesis methods. In this research, silver nanoparticles(AgNPs) produced by Pseudomonas bacteria were used to prepare antibacterial membranes. To investigate the antibacterial activity of the membranes, 0.25, 0.50 and 1.00 wt.% of these nanoparticles were used in the mixture of membranes prepared by the phase inversion method. The structure of the membranes was investigated using X-ray fluorescence spectroscopy. The DLS analyzer determined the size of the synthesized nanoparticles under optimal conditions to be in the nanometer range. valuate the antibacterial properties of the membranes, the disk test and the bacteria Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were used. To investigate the performance of the membranes, their flux and their rejection were tested. The results showed that the permeability and antibacterial properties of the membranes against gram-positive and gram-negative bacteria increased clearly with the increase of nanoparticles prepared by the green synthesis method.