Influence of various types of silica nanoparticles on permeation properties of polyurethane/silica mixed matrix membranes

Hassanajili, Shadi; Khademi, Mohammadamin; Keshavarz, Peyman

doi:10.1016/j.memsci.2013.10.057

Cited by 100 publications

(59 citation statements)

References 61 publications

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“…Firstly, the interaction between Si and CA resists the proper segmental packing of CA polymer chains, thereby creating voids (free volume) and ultimately enhancing gaseous diffusion. Secondly, the polar -OH groups on the surface of Si also interact with polar gases, i.e., CO 2 , and augments CO 2 solubility in CA polymer [3,33,34]. Thus, overall gas permeability is notably influenced by adding Si particles to the CA matrix.…”

Section: Introductionmentioning

confidence: 99%

Comparison of silica and novel functionalized silica-based cellulose acetate hybrid membranes in gas permeation study

et al. 2015

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Cellulose acetate (CA) is a widely applied glassy polymer in the preparation of gas separation membranes. In the present study, hybrid membranes were prepared by incorporating silica (Si) and silica functionalized with ptetranitrocalix[4]arene (Si-CL) into the CA matrix, and their gas permeation abilities were explored with regard to CO 2 , N 2 and CH 4 gases. The diffusion-induced phase separation (DIPS) method was adopted to make pure CA, CA/Si, and CA/Si-CL hybrid membranes. The concentration of Si-CL was varied as 10 wt%, 20 wt% and 30 wt% in the hybrid membranes. The analytical techniques employed for membrane characterization were Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), and X ray-diffraction (XRD) analysis. The proper interaction of Si and Si-CL was confirmed by FTIR analysis. However, the homogenous surface textures of CA/Si, and CA/Si-CL hybrid membranes were evaluated through SEM. Furthermore, AFM analysis was performed to examine the surface roughness of these hybrid membranes. The changes in the crystallinity of CA were also examined by XRD analysis after adding Si and Si-CL. Moreover, the tensile strength of the CA/Si hybrid membrane was found to be better than that of CA/Si-CL hybrid membranes. CO 2 , CH 4 and N 2 gases were used for gas permeation experiments at 400 kPa. Among CO 2 and CH 4 gases, the permeability of N 2 was high in CA/Si-CL hybrid membranes, and N 2 /CO 2 selectivity of these membranes was 22.6.

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Section: Introductionmentioning

confidence: 99%

Comparison of silica and novel functionalized silica-based cellulose acetate hybrid membranes in gas permeation study

et al. 2015

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“…Similar results were also reported in the literature. 29 The brittleness of the final membranes was influenced by the amount of HA in the MMMs. When the amount of HA particles in the composites was less than 50%, the obtained membranes were intact and strong.…”

Section: Ha Characterizationmentioning

confidence: 99%

“…have been introduced as fillers into the PU matrix to improve the permeation flux or selectivity of the PU membranes. [14][15][16][17] One promising porous material for use as a filler for the fabrication of MMMs is hydroxyapatite (HA). The HA, Ca 10 (PO 4 ) 6 (OH) 2 , is a calcium phosphate ceramic with important applications in the fields of medicine and chemistry.…”

Section: Introductionmentioning

confidence: 99%

Mixed‐matrix membranes based on polyurethane containing nanohydroxyapatite and its potential applications

Ciobanu

2015

J of Applied Polymer Sci

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In this study, new asymmetric polyurethane (PU) mixed-matrix membranes with different nanohydroxyapatite loadings were prepared via a dry-wet phase inversion method by the dispersion of hydroxyapatite (HA) nanoparticles in the PU matrix. The HA nanopowder was obtained by a wet chemical precipitation method; it showed an average crystallite size of 58.3 nm, a specific surface area of 261 m 2 /g, and a pore size of about 1.6 nm. The effects of the HA loading (10-50 wt %) on the PU membrane characteristics were studied. The scanning electron microscopy images revealed that the HA nanoparticles were well dispersed enough in the PU matrix. The average pore size in the top layer and porosity of the membranes slowly decreased, whereas the hydrophilicity and water permeability increased with increasing content of HA. The evaluation of the nanofiltration performance was performed by investigation of the NaCl rejection. The composite membranes had a higher salt-removal capacity than the unfilled PU membrane.

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“…Attractive properties of polyurethanes, have made them good candidates for gas separation. Furthermore, many researchers have attempted to improve their permeability and selectivity through various procedures such as Nano particles addition [23][24][25][26][27], blending with other polymers [28,29] and changing the type and content of materials used in their synthesis [30,31]. Polyurethanes show rubbery behavior in most of operating temperatures of polymers, and their free volume size for gas transport is strongly dependent on the interaction of soft segments with the glassy or semicrystalline hard segments [32].…”

Section: Introductionmentioning

confidence: 99%

Vegetable oil-based polyurethane membrane for gas separation

Karimi

Khanbabaei²,

Sadeghi

2017

Journal of Membrane Science

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Influence of various types of silica nanoparticles on permeation properties of polyurethane/silica mixed matrix membranes

Cited by 100 publications

References 61 publications

Comparison of silica and novel functionalized silica-based cellulose acetate hybrid membranes in gas permeation study

Comparison of silica and novel functionalized silica-based cellulose acetate hybrid membranes in gas permeation study

Mixed‐matrix membranes based on polyurethane containing nanohydroxyapatite and its potential applications

Vegetable oil-based polyurethane membrane for gas separation

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