Development Of Mixed Matrix Membranes Research Articles

A Drying‐Free, Water‐Based Process for Fabricating Mixed‐Matrix Membranes with Outstanding Pervaporation Performance

AbstractDespite much progress in the development of mixed matrix membranes (MMMs) for many advanced applications, the synthesis of MMMs without particle agglomeration or phase separation at high nanofiller loadings is still challenging. In this work, we synthesized nanoporous zeolitic imidazole framework (ZIF‐8) nanoparticles with a particle size of 60 nm and a pore size of 0.34 nm in water and directly added them into an aqueous solution of the organic polymer poly(vinyl alcohol) (PVA) without an intermediate drying process. This approach led to a high‐quality PVA/ZIF‐8 MMM with enhanced performance in ethanol dehydration by pervaporation. The permeability of this MMM is three times higher than that of pristine PVA, and the separation factor is nearly nine times larger than that of pristine PVA. The significantly improved separation performance was attributed to the increase in the fractional free volume in the membranes.

Surface modification in inorganic filler of mixed matrix membrane for enhancing the gas separation performance

AbstractThe development of mixed matrix membrane (MMM) in gas separation process has drawn great attention due to its promising properties. MMM consists of a polymer as the matrix phase, whereas the inorganic filler serves as the dispersed phase. However, poor contact between these two phases often results in unselective gas flow and becomes one of the major issues in the MMM development. Currently, various modification techniques of the inorganic filler to improve the compatibility between the polymers and the particles have been reported. Because of this modification, the CO

Membranes for Gas Separation Current Development and Challenges

—A new bang of natural gas demand has opened up the opportunities towards the utilization of membrane technology for the purification process.The advantages in terms of smaller footprint, lower weight, minimum utility requirement and low labor intensity make them appropriate for wide scale applications. Polymeric membrane is one of the greatest emerging fields in membrane material development. Nevertheless, the separation performance of the existing polymeric materials were reached a limit in the trade-off between permeability and selectivity. The development of inorganic material gives a significance improvement in membrane performance but it outrageously expensive for many applications and having complicated procedure during fabrication process have limit the application of inorganic membrane in gas separation. Thus, a rapid demand in membrane technology for gas separation and the effort toward seeking the membranes with higher permeability and selectivity has motivated the development of mixed matrix membrane. Mixed matrix membrane (MMM) which incorporating inorganic fillers in a polymer matrix is expected to overcome the limitations of the polymeric and inorganic membranes. Apart from an overview of the different membrane materials for gas separation, this paper also highlights the development of mixed matrix membrane and challenges in fabrication of mixed matrix membranes.

Mixed matrix membranes as potential transdermal devices for gemfibrozil release

ABSTRACTAim of this work was the development of mixed matrix membranes as potential devices for transdermal controlled release of gemfibrozil (2,2‐dimethyl‐5‐(2,5‐dimethylphenoxy) pentanoic acid). The effect of the hydrophilic NaX zeolite and of drug loading on the release kinetics of the drug was investigated. The material used as membrane matrix was polydimethylsiloxane. Scanning electron microscopy analysis showed as zeolite crystals were well embedded into the polymeric matrix. Membrane characterizations by means of swelling ratio, moisture uptake, and erosion degree determination indicated low swelling degree and moisture uptake, and the absence of erosion. This results confirmed as these membranes did not promote bacterial growth and skin irritation. The performance of the membranes was evaluated by performingin vitrorelease studies and percutaneous tests through the stratum corneum taken from the skin of rabbit ear.In vitroexperiments indicated as the best system was the membrane containing 12 wt % of zeolite and 2.6 wt % of gemfibrozil (PDMS‐2.6GEM‐12NaX) and so it was used in the percutaneous tests. In this case, the permeation rate was lower owing to the presence of an additional resistance applied by rabbit skin. An interesting result was the linear behavior indicating that the permeation of the drug thorough the device occurred with zero‐order kinetic which is the feature of the transdermal controlled delivery systems. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2015,132, 41698.

A Review on Glassy Polymeric Membranes for Gas Separation

Polymeric membranes are widely used for gas separation purposes but their performance is restricted by the upper bound trade-off discovered by Robeson in 1991. The polymeric membrane can be glassy, rubbery or a blend of these two polymers. This review paper discusses the properties of glassy polymer membranes and their performance in gas separation. The area of improvement for glassy membrane with development of mixed matrix membrane is also highlighted.

Development of mixed matrix membranes for controlled release of ibuprofen

AbstractIn this work was studied the effect of different zeolite topologies on the release of ibuprofen from mixed matrix membranes (MMMs). The main parameters investigated were: zeolite concentration, its hydrophilic/hydrophobic character, and drug loading. About the different investigated systems, the PDMS NaX (I) membrane seems to be the most promising for its application as transdermal device. The release data were fitted with different mathematical models (zero order, first order, Higuchi, Bhaskar, and Korsemeyer‐Peppas) to give a possible explanation of the release mechanism of the drug from MMMs. The release data of the drug from pure PDMS membranes (PDMS IBU) were fitted by the Higuchi model (R2 pari a 0.97). In the case of MMMs, the correlation coefficients are very far from the unit value except for the PDMS NaX (I) system that obeys to the Korsmeyer–Peppas (0.98) and Bashkar (0.99) models. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Development of mixed matrix membranes based on zeolite Nu-6(2) for gas separation

This work describes the preparation, characterization and application of hybrid organic/inorganic mixed matrix membranes made from inorganic phase Nu-6(2) as the molecular sieve and polysulfone Udel® as the organic phase. Due to the hydrophobic character of both the zeolitic phase (prepared with a high Si/Al ratio of 45, in contrast to the Si/Al=1 of the commonly used zeolite A) and the polysulfone polymer, membranes obtained from these two phases are free of interfacial voids, as observed by SEM characterization and inferred from the membrane performance. Gas permeation tests carried out for the 50/50 H2/CH4 binary mixture revealed a significant enhancement of H2 separation. Under the same conditions of 538kPa retentate pressure and room temperature, H2 permeability and H2/CH4 separation selectivity were 110 Barrer and 13 and 36 Barrer and 398, respectively, for the bare polysulfone membrane and for the Udel®-Nu-6(2) mixed matrix membrane. This superior performance of the hybrid membrane is attributed to the molecular sieve role played by the selected zeolitic phase which has two different types of eight-membered-ring channels with limiting dimensions of 2.4 and 3.2Å.