• Proceedings of the Membrane Society of Korea Conference
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• 2002.11a
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• pp.33-38
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• 2002

No Abstract, See Full Text

• Proceedings of the Membrane Society of Korea Conference
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• 2000.11a
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• pp.39-42
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• 2000

• Proceedings of the Membrane Society of Korea Conference
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• 2005.11a
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• pp.39-47
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• 2005

• Transactions of the Korean hydrogen and new energy society
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• v.24 no.3
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• pp.200-205
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• 2013

The separation of hydrogen depends on porosity, diffusivity and solubility in permeation membrane. Dense membrane is always showing a solution diffusion mechanism but porous membrane is not showing. Therefore, porous membrane has a good hydrogen flux due to pore is carried out transferred media. This mechanism is named as the Knudsen diffusion. Hydrogen molecules or hydrogen atoms are diffused along pore that is a mean free path. In this study, complex layer hydrogen permeation membrane was fabricated by hot press process. And then, it was evaluated and calculated to relationship between hydrogen permeability and membrane porosity.

• Membrane Journal
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• v.30 no.2
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• pp.111-123
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• 2020

Growing industrialization and climate change lead to the huge demand for clean drinking water. Desalination of sea water by membrane separation process is one of the alternative and economically viable methods to fulfil the demand for water. In the membrane separation process, the presence of 2D materials enhances the performance of membrane by facilitating the water permeation, salt rejection, flux rate, and selectivity compared to the traditional reverse osmosis thin-film-composite membranes. In this review, composite membranes with different kinds of 2D materials are discussed on the basis of materials synthesis, characterization and desalination process.

• Journal of Industrial Technology
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• v.22 no.A
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• pp.249-254
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• 2002

The surface of tube-type alumina substrate was modified with a silane coupling agent in order to modify the membrane surface with hydrophobicity. Contact angle of water drops on modified membrane was greater than $90^{\circ}$. The modified membrane was tested in pervaporation and vapor permeation for the recovery of menthol from dilute menthol/water mixture. With increasing menthol concentration in the feed at $45^{\circ}C$, permeation rate of menthol in pervaporation and vapor permeation increased from $0.039(g/m^2hr)$ to $0144(g/m^2hr)$ and from. $0.077(g/m^2hr)$ to $0.297(g/m^2hr)$ respectively. When feed concentration is 0.005(g/L) at $45^{\circ}C$, separation factor for menthol in pervaporation and vapor permeation is 20,7 and 40.5 respectively.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.9-12
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• 2007

The transport mechanisms of the MTES (methyltriethoxysilane) templating silica/a-alumina composite membrane were evaluated by using four binary and one quaternary hydrogen mixtures through permeation experiments at unsteady- and steady-states. Since the permeation flux in the MTES membrane, through the experimental and theoretical studies, was affected by molecular sieving effects as well as surface diffusion properties, the kinetic and equilibrium separation should be considered simultaneously according to molecular properties. In order to depict the transient multi-component permeation on the templating silica membrane, the GMS (generalized Maxwell-Stefan) and DGM (dust gas model) were adapted to unsteady-state material balance.

• Proceedings of the Membrane Society of Korea Conference
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• 1995.09a
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• pp.21-22
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• 1995

Gas separation science and technology is among the most rapidly growing areas involving membrane-based processes. Nitrogen enrichment of air, hydrogen recovery from a broad array of stream types, and removal of acid gases from natural gases are typical of the applications in this field. Great progress has been made in the discovery of guidelines optimization of polymer structures with simultaneously high permeabilities and selectivities for these important gas pairs. The development of thin-skinned asymmetric hollow fibers have also provided structures with extremely high permeation fluxes. Especially in the case of O$_{2}$/N$_{2}$ separations, the rate of improvements in new polymeric materials for gas separations appears to be slowing to a halt. Evidence will be presented, however, that the practical tradeoff between membrane permeability and selectivity has not been reached.

• Proceedings of the Membrane Society of Korea Conference
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• 1998.06a
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• pp.81-94
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• 1998

Nowadays, membrane separation such as reverse osmosis (RO) and ultrafiltration (UF) play an important role in the industrial separation technology. Among desalination technologies available today, reverse osmosis is usually the most economical process for wide range of water salinity. Main applications include production of high purity water, desalination of seawater and brackish water for a drinking water supply, treatment of waste water for environmental protection, and recovery of precious materials from industrial waste water. In this paper, we will mention membrane performance and these practical use focused on reverse osmosis membranes and ultrafiltration membranes recently developed by Toray.

• Journal of the Korean Society of Industry Convergence
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• v.2 no.2
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• pp.83-90
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• 1999

A cellulose acetate membrane containing silver nitrate was prepared by gelatinizing in water at $2^{\circ}C$ after evaporating solvent from the casting solution on a glass plate. Permeation experiments for oxygen and nitrogen were conducted in the ranges of temperature, $5-40^{\circ}C$ and pressure difference, $1-5kg/cm^2$ in order to investigate the effects of temperature and pressure difference on permeation characteristics of the membrane. When the evaporation time was increased, the permeability of oxygen decreased but the separation factor of oxygen against nitrogen increased since a more dense layer was formed on the membrane surface. When the silver nitrate was added, the permeation flux was doubled and the separation factor was improved from 3.0 to 3.3. This implies that silver nitrate acts as an oxygen carrier in the membrane.