دکتر غلامعلی کوهمره

دانشیار

گروه شیمی آلی و پلیمر
دانشکده شیمی

پست الکترونیکی

g.a.koohmareh@sci.ui.ac.ir

آدرس

دانشگاه اصفهان میدان آزادی اصفهان، ایران
کد پستی : 8174673441

2009

2025

فعالیت های پژوهشی بر اساس سال

معرفی کلی

برونداد‌های پژوهشی

همه موارد

مقالات

کتاب

مرتب سازی بر اساس:

مقالات لاتین

2025

Achieving superior Laplace pressure in electrospun PVDF/PAN Janus membranes: A morphological approach

( Article . )

Ghalavand, B., Koohmareh, G.A., Homayoonfalfini, M.

Separation and Purification Technology (13835866)354

Janus membranes have asymmetric wettability on each side. This contrasting structure gives them an internal driving force for spontaneous fluid transport (caused by Laplace pressure). The objective of this research is to attain the maximum Laplace pressure for electrospun PVDF/PAN Janus membranes by adjusting the fiber diameter and, consequently, the pore size and contact angle in each layer of the membrane. To achieve this goal, the Taguchi method was employed, and the parameters of the electrospinning process were modified to determine the optimal conditions for obtaining the smallest and largest fiber diameters for PAN and PVDF polymers. Accordingly, four distinct types of Janus membranes with different morphologies in each layer were synthesized. SEM analysis was employed to characterize the structural and morphological properties of the fibers in each layer. Additionally, the contact angle (CA) was measured to assess the hydrophilicity of each layer and determine the droplet penetration rate across the membrane. According to the results, the maximum Laplace pressure (205.60 kPa calculated by the analysis of SEM images and 197.4 kPa calculated by the bubble point test) and highest droplet penetration rate (0.83 µL/s) were attributed to the Janus membrane with the lowest pore size in the hydrophilic layer (0.65 µm) and the highest pore size in the hydrophobic layer (3.44 µm). The performance of the optimized membrane was evaluated with respect to unidirectional water transport and water–oil mixture separation. The results showed a rectification ratio of 3.92, a permeate flux of 7.9 × 104 L·m−2·h−1·bar−1, and a separation efficiency of 96.8 %. Finally, it was demonstrated that the Laplace pressure of the optimal Janus membrane in this study is 2.66 times superior to that of the best similar one in previous studies. The appropriate and allowable range for pore size and contact angle, necessary to attain a satisfactory Laplace pressure (exceeding 100 kPa), has been explored, determined, and recommended for future researchers to foster inspiration in the field of Janus membranes. © 2024 Elsevier B.V.

2023

Desalination of aqueous solutions using interpenetrating polymeric membranes-integrated zeolite through pervaporation and reverse osmosis

( Article . )

Jafarian, M., Malekpour, A., Koohmareh, G.A.

Desalination and Water Treatment (19443994)286pp. 16-28

MOF and GO containing interpenetrated polymers for high throughput desalination

( Article . )

Jafarian, M., Malekpour, A., Koohmareh, G.A.

Desalination and Water Treatment (19443994)307pp. 18-29

2022

Bipyridine containing poly(amic-acid)s: Synthesis, characterization, and sorption behavior toward the Ni (II) ions

( Article . )

Vakili, S., Koohmareh, G.A., Malekpour, A.

High Performance Polymers (09540083)34(4)pp. 377-387

Poly(MMA-co-MI) Nanocomposite with Modified Nano ZRP with KH570 Linker: Preparation, Characterization and Transparency Properties

( Article . )

Atabaki, F., Koohmareh, G.A., Sarikhani, S.

Journal of the Turkish Chemical Society, Section A: Chemistry (21490120)9(3)pp. 809-820

Protein and polysaccharide-based asymmetric mat with tuned bilayer configuration for enhanced wound healing efficiency

( Article . )

Tehrani, F.K., Sheikhi, M., Rafiemanzelat, F., Esmaeili, F., Ghodsi, S., Koohmareh, G.A., Ghalavand, B.

Carbohydrate Polymers (01448617)292

2020

New Thermally Stable and Organosoluble Polyamides and Copolyamides Containing Oxazolopyridine Pendant Moiety

( Article . )

Khodadadipoor, Z., Koohmareh, G.A., Zinab, J.M.

The Arabian Journal For Science And Engineering (2193567X)45(6)pp. 4727-4735

2019

Preparation and characterization of aqueous stable electro-spun nanofibers using polyvinyl alcohol/polyvinyl pyrrolidone/zeolite

( Article . )

Mahmoudi beram, F., Koohmareh, G.A., Malekpour, A.

Soft Materials (15394468)17(1)pp. 41-56

Cross-linked polyvinyl alcohol/polyvinyl pyrrolidone/zeolite fibers were prepared in the presence of potassium peroxodisulphate (K 2 S 2 O 8 ) under the curing process by the electrospinning technique. The narrowest nanofibers of PVA/PVP (50:50) were prepared under optimum experimental conditions of 2.5 × 10 −4 mol of K 2 S 2 O 8 , an applied voltage of 22 KV, the distance of 15 cm and the feed rate of 0.2 mL/h. The progress of the cross-linking was examined by immersion of the prepared nanofibers in water and following the swelling degrees. By raising the K 2 S 2 O 8 amount and curing time, the cross-linking density was increased. X-ray diffraction (XRD) demonstrated that the crystallinity of the nanofibers was decreased by the increase of K 2 S 2 O 8 and the lowest crystallinity was observed for PVA/PVP (70:30). The contact angle of nanofibers was decreased from 72° to 34 by increasing PVP ratio from 30 to 70. The morphology of the nanofibers before and after immersion in the simulated body fluid (SBF) was studied using electron scanning microscopy (SEM) and PVA/PVP (70:30) showed the highest changes in the morphology while the lowest one was observed for PVA/PVP (50:50). Moreover, the cross-linked PVA/ PVP with the ratio of 50:50 had the narrowest diameter of 200 ± 100 nm, and by addition of about 0.5% zeolite, it was even reduced more to 150 ± 50 nm. The cross-linked nanofibers (50:50) with 0.5 wt% and 1.5 wt% zeolite nanoparticles showed the tensile modules of 416.26 and 703.52 MPa, respectively, while in the absence of zeolite, it was209.25 MPa. Fibroblast L929 cells were cultured on the cross-linked PVA/PVP/zeolite (50:50:0.5) nanofiber, and the cell proliferation and growth was evaluated by MTT (3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide) assay. Fibroblasts grew on the surface of scaffold showed good morphology and proliferation after seven days and the absorption amount was increased from 0.075 to 0.78. © 2018, © 2018 Taylor & Francis Group, LLC.

2018