scholarly journals Investigations on the Properties and Performance of Mixed-Matrix Polyethersulfone Membranes Modified with Halloysite Nanotubes

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 671 ◽  
Author(s):  
Mozia ◽  
Grylewicz ◽  
Zgrzebnicki ◽  
Darowna ◽  
Czyżewski
Keyword(s):  
Membrane Fouling ◽  
Halloysite Nanotubes ◽  
Positive Influence ◽  
Inversion Method ◽  
Fouling Resistance ◽  
Force Microscopy ◽  
Atomic Force ◽  
Wet Phase Inversion ◽  
And Performance ◽  
Phase Inversion Method

Ultrafiltration (UF) polyethersulfone (PES) membranes were prepared by wet phase inversion method. Commercial halloysite nanotubes (HNTs) in the amount of 0.5–4 wt % vs PES (15 wt %) were introduced into the casting solution containing the polymer and N,N-dimethylformamide as a solvent. The morphology, physicochemical properties and performance of the membranes were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), zeta potential, porosity and contact angle analyses, as well as permeability measurements. Moreover, the antifouling properties of the membranes were evaluated during UF of a model solution of bovine serum albumin (BSA). The research revealed a positive influence of modification with HNTs on hydrophilicity, water permeability and antifouling properties of the PES membranes. The most significant improvement of permeability was obtained in case of the membrane containing 2 wt % of HNTs, whereas the highest fouling resistance was observed for 0.5 wt % HNTs content. It was found that a good dispersion of HNTs can be obtained only at loadings below 2 wt %. Based on the results a relation between severity of membrane fouling and surface roughness was proved. Moreover, an increase of the roughness of the modified membranes was found to be accompanied by an increase of isoelectric point values.

Preparation and Characterization of Polysulfone / Recam® Composite Membranes for Potable Water Production

2020 ◽  
Vol 1012 ◽  
pp. 79-83
Author(s):  
Priscila Anadão ◽  
Hélio Wiebeck
Keyword(s):  
Infrared Spectroscopy ◽  
Composite Membranes ◽  
Polymer Chains ◽  
Inversion Method ◽  
Mechanical Resistance ◽  
Force Microscopy ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Atomic Force ◽  
Wet Phase Inversion ◽  
Phase Inversion Method

Polysulfone/ Recam® composite membranes were prepared via the wet-phase inversion method. The interactions between polysulfone and additive were revealed by Fourier-transformed infrared spectroscopy and atomic force microscopy. Material properties, such as thermal and mechanical ones, were also analyzed. The increase of rugosity by augmenting the Recam® content was depicted by AFM images. Infrared spectroscopy provided very useful information about the interactions between polymer chains and additive. Thermal stability and mechanical resistance showed dependence on the additive content, which were higher for higher contents.

scholarly journals Characteristics of polyurethane-based sustained release membranes for drug delivery

2013 ◽  
Vol 11 (4) ◽  
pp. 542-553 ◽  
Author(s):  
Mihaela Mândru ◽  
Constantin Ciobanu ◽  
Stelian Vlad ◽  
Maria Butnaru ◽  
Laurent Lebrun ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Physicochemical Characterization ◽  
Dermal Fibroblasts ◽  
Attenuated Total Reflection ◽  
Inversion Method ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Polyurethane Membranes ◽  
Phase Inversion Method

AbstractThis paper is focused on the preparation and physicochemical characterization of two poly(ester ether urethane)s with rifampicin in their matrix and different molar concentrations of urethane groups. The polyurethanes with rifampicin were processed as asymmetrical microporous membranes by a phase inversion method and characterized by attenuated total reflection — Fourier transform infrared (ATR-FTIR) spectroscopy and differential scanning calorimetry (DSC). The influence of the surface morphology in the release of drug compounds was analyzed by scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, and water uptake. The release of rifampicin depends on the molar concentration of urethane groups and also on the surface morphology of the polyurethane membranes. The antibacterial activity was evaluated with S. Epidermidis RP 62 A and P. Aeruginosa ATCC 1544. Finally, the biocompatibility of the polyurethane membranes was studied with human dermal fibroblasts (HDF) to evaluate the potential biomedical applications.

Research on the Porous Structures and Properties of Composite Membranes of Polysulfone and Nanocrystalline Cellulose

2011 ◽  
Vol 675-677 ◽  
pp. 391-394
Author(s):  
Shuai Li ◽  
Yuan Gao ◽  
Lu Bai ◽  
Wei Qian Tian ◽  
Li Ping Zhang
Keyword(s):  
Pure Water ◽  
Water Flux ◽  
Composite Membranes ◽  
Nanocrystalline Cellulose ◽  
Inversion Method ◽  
Porous Structures ◽  
Force Microscopy ◽  
Cellulose Pulp ◽  
Atomic Force ◽  
Phase Inversion Method

Nanocrystalline cellulose (NCC) was used to improve hydrophilic property and permeability of polysulfone (PS) membrane. It was prepared from cellulose pulp by acid-catalyzed hydrolysis and high-pressure homogenization. The casting solution of a PS/NCC blend was obtained by adding NCC to a PS membrane solution and the composite membrane was prepared by phase-inversion method. In addition, the concentration of NCC was increased gradually from 0 wt% to 1.1 wt% during the preparation in order to examine the pure water flux and the retention of a bovine serum albumin (BSA). Simultaneously, the porosity and mean pore size of the membrane was detected and calculated. The result showed that the capacity for ultrafiltration was enhanced with appropriate NCC content. The membranes were also observed with atomic force microscopy (AFM) and scanning electron microscopy (SEM) to explore their porous structures.

scholarly journals Anti-Fouling and Anti-Bacterial Modification of Poly(vinylidene fluoride) Membrane by Blending with the Capsaicin-Based Copolymer

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 323 ◽  
Author(s):  
Xiang Shen ◽  
Peng Liu ◽  
Shubiao Xia ◽  
Jianjun Liu ◽  
Rui Wang ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Vinylidene Fluoride ◽  
Pure Water ◽  
Radical Copolymerization ◽  
Inversion Method ◽  
Pvdf Membrane ◽  
Poly Vinylidene Fluoride ◽  
And Performance ◽  
Phase Inversion Method ◽  
Enhanced Surface

Membrane fouling induced by the adsorption of organic matter, and adhesion andpropagation of bacteria onto the surfaces, is the major obstacle for the wide application of membranetechnology. In this work, the capsaicin-based copolymer (PMMA-PACMO-Capsaicin) wassynthesized via radical copolymerization using methyl methacrylate (MMA), N-acrylomorpholine(ACMO) and 8-methyl-N-vanillyl-6-nonenamide (capsaicin) as monomers. Subsequently, thecapsaicin-based copolymer was readily blended with PVDF to fabricate PVDF/PMMA-PACMOCapsaicinflat sheet membrane via immersed phase inversion method. The effects of copolymerconcentration on the structure and performance of resultant membranes were evaluatedsystematically. With increase of PMMA-PACMO-Capsaicin copolymer concentration in the castingsolution, the sponge-like layer at the membrane cross-section transfers to macroviod, and the poresize and porosity of membranes increase remarkably. The adsorbed bovine serum albumin protein(BSA) amounts to PVDF/PMMA-PACMO-Capsaicin membranes decrease significantly because ofthe enhanced surface hydrophilicty. During the cycle filtration of pure water and BSA solution, theprepared PVDF/PMMA-PACMO-Capsaicin membranes have a higher flux recovery ratio (FFR) andlower irreversible membrane fouling ratio (Rir), as compared with pristine PVDF membrane.PVDF/PMMA-PACMO-Capsaicin membrane is found to suppress the growth and propagation ofStaphylococcus aureus bacteria, achieving an anti-bacterial efficiency of 88.5%. These results confirmthat the anti-fouling and anti-bacterial properties of PVDF membrane are enhanced obviously byblending with the PMMA-PACMO-Capsaicin copolymer.

scholarly journals An Experimental Investigation: Effect of Phase Inversion Methods on Membrane Structure and Its Performance on PEG Filtration

2017 ◽  
Vol 17 (1) ◽  
Author(s):  
Masooma Irfan ◽  
Hatijah Basri ◽  
M. Irfan
Keyword(s):  
Phase Separation ◽  
Phase Inversion ◽  
Multiwall Carbon Nanotubes ◽  
Polymeric Membranes ◽  
Inversion Method ◽  
Inversion Process ◽  
Membrane Morphology ◽  
And Performance ◽  
Phase Inversion Method ◽  
Multiwall Carbon

In this work, the effect of different phase inversion process on membrane morphology and performance was studied. Polyethersulfone (PES) based polymeric membranes was fabricated containing polyvinylpyrrolidone (PVP) and carboxylic functionalized multiwall carbon nanotubes (MWCNT) as additives and polyethylene glycol (PEG) having a molecular weight 1K, 10K and 35K (Dalton) were used as a model solution for observing the rejection/filteration ability of fabricated membranes. Non-solvent induce phase separation (NIP) and dry-wet phase separation (DWP) method was adopted for membrane synthesis. The FTIR spectra showed that PVP/MWCNT was effectively blended with PES polymer and different phase inversion method led to different internal morphologies of membranes as confirmed by FESEM images. The PEG rejection results suggested that membranes formed by DWP method had approximately double rejection ability than membranes formed by NIP process.

scholarly journals P84/Zeolite-Carbon Composite Mixed Matrix Membrane for CO2/CH4 Separation

2019 ◽  
Vol 19 (3) ◽  
pp. 650 ◽  
Author(s):  
Triyanda Gunawan ◽  
Retno Puji Rahayu ◽  
Rika Wijiyanti ◽  
Wan Norharyati Wan Salleh ◽  
Nurul Widiastuti
Keyword(s):  
Carbon Composite ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Inversion Method ◽  
Mixed Matrix ◽  
Force Microscopy ◽  
Membrane Performance ◽  
Polyimide Membrane ◽  
Phase Inversion Method

Mixed Matrix Membranes (MMMs) which consist of 0.3 wt.% Zeolite-Carbon Composite (ZCC) dispersed in BTDA-TDI/MDI (P84 co-polyimide) have been prepared through phase inversion method by using N-methyl-2-pyrrolidone (NMP) as a solvent. Membranes were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Thermogravimetric Analysis (TGA), and Fourier Transform Infrared (FTIR). Membrane performance was measured by a single gas permeation of CO2 and CH4. The maximum permeability of CO2 and CH4, which up to 12.67 and 6.03 Barrer, respectively. P84/ZCC mixed matrix membrane also showed a great enhancement in ideal selectivity of CO2/CH4 2.10 compared to the pure P84 co-polyimide membrane.

scholarly journals The influences of polydopamine immersion time on characteristics and performance of polyvinylidene fluoride ultrafiltration membrane

2018 ◽  
Vol 197 ◽  
pp. 09007
Author(s):  
Syawaliah Syawaliah ◽  
Nasrul Arahman ◽  
Medyan Riza ◽  
Sri Mulyati
Keyword(s):  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Sem Analysis ◽  
Inversion Method ◽  
Asymmetric Structure ◽  
Pvdf Membrane ◽  
Before And After ◽  
Poly Ethylene ◽  
And Performance ◽  
Phase Inversion Method

The Polyvinylidene Fluoride (PVDF) membrane has been prepared by phase inversion method using N,N-dimethylacetamide (DMAc) as solvent and Poly Ethylene Glycol (PEG) as additive. The fabricated membrane was modified by Polydopamine (PDA) coating in concentration of 0.5 mg/ml and immersion times of 2 hours, 6 hours, and 24 hours. The characteristics and performance of the PVDF membranes before and after the modification are studied in this paper. The result of the water flux experiment showed that the PDA-coated PVDF membranes showcased a higher flux than that of pure PVDF membrane. Scanning Electron Microscopy (SEM) analysis confirmed that the membrane had an asymmetric structure consisting of two layers. There was no significant influence on the addition of PDA to the morphology of the pore matrix because the modification was done by surface coating. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that PDA was successfully introduced on the surface of PVDF membrane with the appearance of O-H from cathecol and N-H peaks at wavenumber range of 3300-3600 cm-1. Modification with PDA increased the mechanical strength of the membrane which affirmed by the results of the tensile and elongation at break evaluation.

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