scholarly journals Influence of Spin Coating Parameters on Gas Transport Properties of Thin-Film Composite Membranes

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5093
Author(s):  
Stepan Sokolov ◽  
Alexey Balynin ◽  
Danila Bakhtin ◽  
Ilya Borisov
Keyword(s):  
Transport Properties ◽  
Penetration Depth ◽  
Spin Coating ◽  
Rotation Speed ◽  
Composite Membranes ◽  
Selective Layer ◽  
Thin Film Composite ◽  
Film Forming ◽  
Coating Method ◽  
First Time

The influence of casting centrifugation process parameters, such as a rotation speed (ω), the amount of the film-forming solution (V), and its concentration (C) on transport properties of composite membranes were investigated. A number of composite membranes based on poly (1-trimethylsilylpropyne) (PTMSP) and micro- (MFFK-1) and ultrafiltration (UFFK) membranes were obtained using the spin-coating method. For the first time, an unexpected dependence of permeance and ideal selectivity on rotation speed had been discovered: the thickness of the selective layer decreases from 3.0 to 1.0 μm for MFFK-1 and from 1.7 to 1.1 μm for UFFK with an increase of spin coater rotation speed from 500 to 3000 rpm. However, the gas permeance of composite membranes in the range of 500–2000 rpm was reduced due to an increase of a penetration depth of PTMSP into a support layer porous structure (estimated by the EDX method). The permeance of the PTMSP/UFFK membranes was higher than PTMSP/MFFK-1 membranes due to a thinner selective layer and a lower penetration depth of polymer solution into the pores of the support. The highest CO2/N2 selectivity values were achieved as 5.65 ± 0.9 at CO2 permeance 5600 ± 1000 GPU for PTMSP/UFFK membranes (CPTMSP = 0.35%, Vsolution = 1 mL, ω = 1000 rpm), and 6.1 ± 0.5 at CO2 permeance 4090 ± 500 GPU for PTMSP/MFFK-1 membranes (CPTMSP = 0.35%, Vsolution = 1 mL, ω = 2000 rpm).

Influence of Casting Method on Pervaporational Performanses of Polyheptylmethylsiloxane Membranes

2020 ◽  
Vol 869 ◽  
pp. 51-55
Author(s):  
Evgenia Grushevenko ◽  
Ivan A. Podtynnikov ◽  
Olga Sharova ◽  
Tatiana Anokhina ◽  
Ilya L. Borisov
Keyword(s):  
Transport Properties ◽  
Composite Membrane ◽  
Spin Coating ◽  
Casting Method ◽  
Selective Layer ◽  
Spin Coating Method ◽  
Coating Method ◽  
Membrane Pervaporation ◽  
First Time

A method of composite membrane obtaining effects on its transport properties. In the present work, for the first time, the influence of the method of applying a selective layer of polyheptylmethylsiloxane on the composite membrane pervaporation properties in the process of alcohol separation from water was studied. The comparison of two casting methods (kiss-coating and spin-coating) was conducted. Morphology of the obtained membranes and their separation properties during the pervaporation of the mixture of C2-C4 alcohols and water. It was shown that kiss-coating allows completely prevent leakage of the selective layer into the substrate pores. And, such a way, it allows to improve permeability of composite membrane (BuOH - 3.5 mol/(kPa·h·m2)). Besides, spin-coating method leads to higher selectivity (BuOH/H2O - 2.3). It is caused by blocking the swelling of that part of the selective layer that is locked in the pores of the substrate. Thus, the choice of the casting method can determine the compatibility of the composite membrane with a specific separation task.

Nanocellulose as Modifier for Hollow Fiber Ultrafiltration PSF Membranes

2019 ◽  
Vol 816 ◽  
pp. 238-243 ◽  
Author(s):  
Tatyana S. Anokhina ◽  
S.D. Bazhenov ◽  
Ilya L. Borisov ◽  
V.P. Vasilevsky ◽  
V.A. Vinokurov ◽  
...  
Keyword(s):  
Transport Properties ◽  
Hollow Fiber ◽  
Cellulose Nanofibrils ◽  
Membrane Modification ◽  
Selective Layer ◽  
Blue Dextran ◽  
First Time ◽  
Molding Solution

In the present work, a study was conducted for the first time on the modification of hollow fiber UF PSF membranes by cellulose nanofibrils. Two approaches to membrane modification were analyzed: 1) introduction of CNF into the molding solution; 2) additions of CNF to the internal coagulant. Analysis of the transport properties of the investigated membranes showed that the first approach allows increasing the porosity of hollow fiber PSF membranes, due to which the permeability increases from 82 to 287 l / m2 h bar compared to the original membranes. Rejection of dye Blue Dextran (MM = 69 kg / mole) is reduced by 20%. The addition of CNF to the outside coagulant led to the formation of not only the inside selective layer, but also the outer one, while the permeability increases 1.5 times, and the rejection of the dye also increases from 96 to 99%.

scholarly journals Novel Composite Membranes Based on Chitosan Copolymers with Polyacrylonitrile and Polystyrene: Physicochemical Properties and Application for Pervaporation Dehydration of Tetrahydrofuran

Membranes ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 38 ◽  
Author(s):  
Ksenia Otvagina ◽  
Anastasia Penkova ◽  
Maria Dmitrenko ◽  
Anna Kuzminova ◽  
Tatyana Sazanova ◽  
...  
Keyword(s):  
Transport Properties ◽  
Optimal Transport ◽  
Mechanical Stability ◽  
Evolved Gas Analysis ◽  
Composite Membranes ◽  
Gas Analysis ◽  
Vinyl Monomers ◽  
Porous Support ◽  
Selective Layer ◽  
Force Microscopy

Pervaporation has been applied for tetrahydrofuran (THF) dehydration with novel composite membranes advanced by a thin selective layer composed of chitosan (CS) modified by copolymerization with vinyl monomers, acrylonitrile (AN) and styrene, in order to improve the chemical and mechanical stability of CS-based membranes. Composite membranes were developed by depositing a thin selective layer composed of CS copolymers onto a commercially-available porous support based on aromatic polysulfonamide (UPM-20®). The topography and morphology of the obtained materials were studied by atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD). Thermal properties and stability were determined by coupled evolved gas analysis (EGA-MS). Transport properties were estimated in pervaporation dehydration of THF. The effect of operating parameters for the pervaporation dehydration of THF such as feed compositions and temperatures (295, 308 and 323 K) was evaluated. It was shown that CS modification with different vinyl monomers led to a difference in physical and transport properties. The composite membrane with the thin selective layer based on CS-PAN copolymer demonstrated optimal transport properties and exhibited the highest water content in the permeate with a reasonably high permeation flux.

scholarly journals High-permeance crosslinked PTMSP thin-film composite membranes as supports for CO 2 selective layer formation

2016 ◽  
Vol 1 (3) ◽  
pp. 235-245 ◽  
Author(s):  
Stepan D. Bazhenov ◽  
Ilya L. Borisov ◽  
Danila S. Bakhtin ◽  
Anastasia N. Rybakova ◽  
Valery S. Khotimskiy ◽  
...  
Keyword(s):  
Thin Film ◽  
Composite Membranes ◽  
Layer Formation ◽  
Selective Layer ◽  
Film Composite ◽  
Thin Film Composite

scholarly journals Effect of the reactive amino and glycidyl ether terminated polyethylene oxide additives on the gas transport properties of Pebax® bulk and thin film composite membranes

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11763-11772 ◽  
Author(s):  
Jelena Lillepärg ◽  
Prokopios Georgopanos ◽  
Thomas Emmler ◽  
Sergey Shishatskiy
Keyword(s):  
Thin Film ◽  
Transport Properties ◽  
Composite Membrane ◽  
Polyethylene Oxide ◽  
Gas Transport ◽  
Glycidyl Ether ◽  
Composite Membranes ◽  
Film Composite ◽  
Thin Film Composite ◽  
Gas Transport Properties

New CO2 selective blend materials were tested for gas transport properties as thick film and thin film composite membrane.

Effect of Casting Solution Composition on Properties of PIM-1/PAN Thin Film Composite Membranes

2019 ◽  
Vol 816 ◽  
pp. 167-173 ◽  
Author(s):  
Maya N. Putintseva ◽  
Ilya L. Borisov ◽  
Alexey A. Yushkin ◽  
R.A. Kirk ◽  
P.M. Budd ◽  
...  
Keyword(s):  
Thin Film ◽  
Gas Separation ◽  
Composite Membranes ◽  
Solution Composition ◽  
Selective Layer ◽  
Film Composite ◽  
Uniform Layer ◽  
Thin Film Composite ◽  
Casting Solution

In this work, PIM-1 thin film composite membranes supported on PAN were developed. The influence of PIM-1 concentration and nature of solvent stabilizer on the structure and gas separation properties of TFC membranes were studied. It was shown that amylene stabilized chloroform as PIM-1 solvent allows membranes to be obtained with a uniform selective layer in the whole range of concentrations used, and the ethanol stabilized chloroform provides a uniform layer at 2 and 4 wt % PIM-1 concentration. The best CO2/N2 selectivities were 35,9 and 39,5 for 4 % wt PIM-1 solution in ethanol and amylene stabilized chloroform, respectively.

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