Ionic strength-responsive poly(sulfobetaine methacrylate) microgels for fouling removal during ultrafiltration

Çalılı, Fatma
Kaner, Papatya
Aro, Grace
Asatekin, Ayse
Çulfaz Emecen, Pınar Zeynep
Zwitterionic materials have received a lot of interest in the field of membrane science and water treatment due to their excellent fouling resistance, super-hydrophilicity, and ionic strength response. However, they have typically been utilized for surface functionalization. In this study, we report the synthesis of zwitterionic poly(sulfobetaine methacrylate), p(SBMA), microgels, and demonstrate the effect of their ionic-strength responsive behavior on the extent and reversibility of fouling on ultrafiltration membranes using Bovine Serum Albumin (BSA) and Baker's yeast as model foulants. The microgels synthesized using inverse emulsion free radical polymerization showed ionic strength response with increasing hydrodynamic diameter from 208 ± 4 nm to 316 ± 7 nm with increasing NaCl concentration from 0 to 0.5 M. The size change upon changing ionic strength was utilized by two approaches: co-depositing microgels with the foulants, and pre-depositing microgels on the membrane. When the microgels were co-deposited with the foulants, there was a small improvement in fouling reversibility while when the microgels were first deposited on the membrane by filtering them through, there formed a stable, continuous layer of p(SBMA) on the surface which clearly increased the fouling reversibility.
Reactive and Functional Polymers


Electro-chemo-mechanical induced fracture modeling in proton exchange membrane water electrolysis for sustainable hydrogen production
Aldakheel, Fadi; Kandekar, Chaitanya; Bensmann, Boris; Dal, Hüsnü; Hanke-Rauschenbach, Richard (2022-10-01)
This work provides a framework for predicting fracture of catalyst coated membrane (CCM) due to coupled electro-chemo-mechanical degradation processes in proton exchange membrane water electrolysis (PEMWE) cells. Electrolysis in the catalyst layer (CL) bulk, diffusion of Hydrogen proton through the membrane (MEM), and mechanical compression at the interface with the porous transport layer (PTL) generate micro-cracks that influence the catalyst degradation. Based on our experimental observations, we propose ...
ARICA, MY; Hasırcı, Vasıf Nejat (1993-01-01)
Poly(2-hydroxyethyl methacrylate) membranes were prepared in aqueous media with different ions and ionic strengths. The enzyme glucose oxidase was incorporated into some of these membranes. It was found that membrane water contents and ionic strengths have a linear relationship as long as the salt is not changed. When the salt was varied, only a relationship between salt concentration and water content could be observed. The membrane permeabilities were all found to be of the same order (10(-8) cm2 s-1) but...
Ni and cu incorporated mesoporous nanocomposite catalytic materials
Nalbant, Asli; Doğu, Timur; Balci, Suna (2008-02-01)
Nickel and copper incorporated MCM-41-like mesoporous nanocomposite materials prepared by the direct hydrothermal synthesis and the impregnation procedures showed highly attractive pore structure and surface area results for catalytic applications. The XRD patterns showed that characteristic MCM-41 structure was preserved for the materials synthesized following an impregnation procedure before the calcination step. The surface area of the Cu impregnated material with a quite high Cu/Si atomic ratio (0.19) w...
Tamoxifen-model membrane interactions: An FT-IR study
Boyar, H; Severcan, Feride (1997-06-01)
The temperature- and concentration-induced effects of tamoxifen (TAM) on dipalmitoyl phosphatidylcholine (DPPC) model membranes were investigated by the Fourier transform-infrared (FT IR) spectroscopic technique. An investigation of the C-H stretching region and the C=0 mode reveals that the inclusion of TAM changes the physical properties of the DPPC multibilayers by (i) shifting the main phase transition to lower temperatures; (ii) broadening the transition profile slightly; (iii) disordering the system i...
Fouling behavior of microstructured hollow fiber membranes in submerged and aerated filtrations
Çulfaz Emecen, Pınar Zeynep; Lammertink, R.G.H. (2011-02-01)
The performance of microstructured hollow fiber membranes in submerged and aerated systems was investigated using colloidal silica as a model foulant. The microstructured fibers were compared to round fibers and to twisted microstructured fibers in flux-stepping experiments. The fouling resistances in the structured fibers were found to be higher than those of round fibers. This was attributed to stagnant zones in the grooves of the structured fibers. As the bubble sizes were larger than the size of the gro...
Citation Formats
F. Çalılı, P. Kaner, G. Aro, A. Asatekin, and P. Z. Çulfaz Emecen, “Ionic strength-responsive poly(sulfobetaine methacrylate) microgels for fouling removal during ultrafiltration,” Reactive and Functional Polymers, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: