Impact of Magnetically Aligned CNT/PC Nanocomposites for Hydrogen Gas Separation Applications

MRS Advances ◽  
2016 ◽  
Vol 1 (42) ◽  
pp. 2873-2880
Author(s):  
Anshu Sharma ◽  
S. P. Nehra ◽  
Y. K. Vijay ◽  
I. P. Jain
Keyword(s):  
Magnetic Field ◽  
Dielectric Constant ◽  
Gas Separation ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Hydrogen Gas ◽  
Nanocomposite Membranes ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Magnetically Aligned

ABSTRACTThe goal of this work is to study the properties of magnetically aligned CNT/PC nanocomposites towards the development of hydrogen gas separation membranes. A fraction (0.1 weight %) of synthesized carbon nanotubes (CNTs) have been dispersed homogeneously throughout polycarbonate (PC) matrix by ultrasonication. The alignment of CNT in PC matrix has been accomplished by applying an external magnetic field of 1200 Gauss. These nanocomposites have been studied by gas permeation using H2, N2and Co2electrical and dielectric constant measurements. Experimental results of gas permeability measurements exhibit here that H2is more selective than N2and Co2in magnetically aligned nanocomposite membranes which can be used as good hydrogen separating media. I-V characteristics show the electron hopping like behavior and dielectric constant shows the enhancement in permittivity of these nanocomposites.

scholarly journals Preparation of Hollow Fiber Membranes Based On Poly(4-methyl-1-pentene) for Gas Separation

Fibers ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Anton Dukhov ◽  
Martin Pelzer ◽  
Svetlana Markova ◽  
Daria Syrtsova ◽  
Maxim Shalygin ◽  
...  
Keyword(s):  
Gas Separation ◽  
Hollow Fiber ◽  
Melt Spinning ◽  
Gas Permeability ◽  
Separation Membranes ◽  
Preparation Conditions ◽  
Gas Separation Membranes ◽  
Temperature Dependences ◽  
Spinning Process ◽  
Apparent Activation Energies

New hollow fiber gas separation membranes with a non-porous selective layer based on poly(4-methyl-1-pentene) (PMP) granules have been obtained using the solution-free melt spinning process. The influence of the preparation conditions on the geometry of the obtained samples was studied. It was found that a spin head temperature of 280 °C and a specific mass throughput of 103 g mm−2 h−1 are optimal to obtain defect-free, thin-walled hollow fibers in a stable melt spinning process, using the given spinneret geometry and a winding speed of 25 m/min. The gas permeability and separation properties of new fibers were studied using CO2/N2 and CO2/CH4 mixtures, and it was found that the level of gas selectivity characteristic of homogeneous polymer films can be achieved. The features of the gas mixture components permeability below and above the PMP glass transition temperature have been experimentally studied in the range of CO2 concentrations from 10 to 90% vol. The temperature dependences of the permeability of the CO2/CH4/N2 mixture through the obtained HF based on PMP have been investigated, and the values of the apparent activation energies of the permeability have been calculated, which make it possible to predict the properties of membrane modules based on the obtained membranes in a wide temperature range.

scholarly journals Synthesis and Characterization of Novel Nanoporous Gl-POSS-Branched Polymeric Gas Separation Membranes

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 110 ◽  
Author(s):  
Ilnaz I. Zaripov ◽  
Ilsiya M. Davletbaeva ◽  
Zulfiya Z. Faizulina ◽  
Ruslan S. Davletbaev ◽  
Aidar T. Gubaidullin ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeability ◽  
Chemical Properties ◽  
Toluene Diisocyanate ◽  
Main Reaction ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Oligomeric Silsesquioxane ◽  
Physical And Chemical

Novel nanoporous Gl-POSS-branched polymers based on the macroinitiator of anionic nature, 2,4-toluene diisocyanate, and octaglycidyl polyhedral oligomeric silsesquioxane (Gl-POSS) were obtained as gas separation membranes. The synthesis of polymers was carried out using various loads of Gl-POSS. It was found that the main reaction proceeding with 2,4-toluene diisocyanate is the polyaddition, accompanied by the isocyanate groups opening of the carbonyl part. This unusual opening of isocyanate groups leads to the formation of coplanar acetal nature polyisocyanates (O-polyisocyanate). The terminal O-polyisocyanate links initiate the subsequent opening of the epoxide rings in Gl-POSS. As a result, Gl-POSS serves as a hard and bulky branching agent and creates the specific framing supramolecular structure, which leads to the formation of nanopores in the polymer, where the flexible polyether components are located inside the cavities. Thermal, mechanical, physical, and chemical properties of the obtained polymers were studied at various Gl-POSS contents in the polymer matrix. It was found that these polymers show high selectivity of gas transport properties for pure ammonia relative to nitrogen and hydrogen at ambient temperature. Measurements showed that the gas permeability coefficients and the values of ideal selectivity were in a non-additive dependence to the Gl-POSS content.

scholarly journals The Optimization of Dispersion and Application Techniques for Nanocarbon-Doped Mixed Matrix Gas Separation Membranes

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 87
Author(s):  
Ruben Hammerstein ◽  
Tim Schubert ◽  
Gerd Braun ◽  
Tobias Wolf ◽  
Stéphan Barbe ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Parameter Study ◽  
Mixed Matrix ◽  
Electrically Conductive ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Roll Mill ◽  
Application Techniques

In this work, supported cellulose acetate (CA) mixed matrix membranes (MMMs) were prepared and studied concerning their gas separation behaviors. The dispersion of carbon nanotube fillers were studied as a factor of polymer and filler concentrations using the mixing methods of the rotor–stator system (RS) and the three-roll-mill system (TRM). Compared to the dispersion quality achieved by RS, samples prepared using the TRM seem to have slightly bigger, but fewer and more homogenously distributed, agglomerates. The green γ-butyrolactone (GBL) was chosen as a polyimide (PI) polymer-solvent, whereas diacetone alcohol (DAA) was used for preparing the CA solutions. The coating of the thin CA separation layer was applied using a spin coater. For coating on the PP carriers, a short parameter study was conducted regarding the plasma treatment to affect the wettability, the coating speed, and the volume of dispersion that was applied to the carrier. As predicted by the parameter study, the amount of dispersion that remained on the carriers decreased with an increasing rotational speed during the spin coating process. The dry separation layer thickness was varied between about 1.4 and 4.7 μm. Electrically conductive additives in a non-conductive matrix showed a steeply increasing electrical conductivity after passing the so-called percolation threshold. This was used to evaluate the agglomeration behavior in suspension and in the applied layer. Gas permeation tests were performed using a constant volume apparatus at feed pressures of 5, 10, and 15 bar. The highest calculated CO2/N2 selectivity (ideal), 21, was achieved for the CA membrane and corresponded to a CO2 permeability of 49.6 Barrer.

Role of critical concentration of PEI in NMP solutions on gas permeation characteristics of PEI gas separation membranes

2013 ◽  
Vol 19 (2) ◽  
pp. 677-685 ◽  
Author(s):  
Ahmad Arabi Shamsabadi ◽  
Ali Kargari ◽  
Masoud Bahrami Babaheidari ◽  
Saeed Laki ◽  
Hadi Ajami
Keyword(s):  
Gas Separation ◽  
Critical Concentration ◽  
Gas Permeation ◽  
Separation Membranes ◽  
Gas Separation Membranes

scholarly journals Synthesis and Gas Permeation Properties of Tetraoxidethianthrene Based Polymers of Intrinsic Microporosity

2021 ◽  
Author(s):  
Sarah A. Felemban ◽  
C. Grazia Bezzu ◽  
Bibiana Comesaña-Gándara ◽  
Johannes Carolus Jansen ◽  
Alessio Fuoco ◽  
...  
Keyword(s):  
Gas Separation ◽  
Gas Permeation ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity ◽  
Permeation Properties ◽  
Potential Use

A series of nine polymers of intrinsic microporosity (PIMs) derived from different bis-catechol monomers and 2,3,7,8-tetrafluoro-5,5’,10,10’-tetraoxidethianthrene (TOT) were synthesised and tested for their potential use as gas separation membranes. As...

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