• Journal of Industrial and Engineering Chemistry
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• v.67
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• pp.199-209
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• 2018

Polyethersulfone (PES)/sulfonated $TiO_2$ ($STiO_2$) nanoparticles (NPs) UF blended membranes were fabricated with different loadings of $STiO_2$. The modified membranes exhibited significant improvement in surface roughness, porosity, and pore size when compared to the PES membrane. The $P-STiO_2$ 1 and $P-TiO_2$ 1 blended membranes exhibited higher water flux, approximately 102.4% and 62.6%, respectively, compared to PES. SPP-$STiO_2$ and $P-STiO_2$ showed lower Rir fouling resistance than the $P-TiO_2$ blended membrane. Overall, the $STiO_2$-blended membranes provide high hydrophilicity permeability, anti-fouling performance, and improved BSA rejection attributed to the hydrogen bonding force and more electrostatic repulsion properties of $STiO_2$.

• Proceedings of the Membrane Society of Korea Conference
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• 1999.10b
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• pp.52-54
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• 1999

• Proceedings of the Membrane Society of Korea Conference
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• 2002.05a
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• pp.86-89
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• 2002

• Proceedings of the Membrane Society of Korea Conference
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• 2001.11a
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• pp.51-54
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• 2001

• Proceedings of the Membrane Society of Korea Conference
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• 2003.11a
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• pp.168-171
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• 2003

• Membrane Journal
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• v.27 no.3
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• pp.273-283
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• 2017

Polysulfone (PSF) is one of an important polymer that has been widely used in the manufacture of asymmetric microfiltration (MF) membranes. PSF membrane is considered as hydrophobic membrane that easily fouled during membrane operation process. The blending method is an effective method for improving the fouling resistance of PSF membranes. sPES (sulfonated polyethersulfone) is one of the useful polymers that can be used in PSF polymer blend method to improve hydrophilicity of PSF membranes. In this study, microfiltration polymer membranes were prepared by using PSF/sPES/PVP/BE/DMF casting solution and water coagulant. The morphology of MF membranes was changed by addition of a small amount of sPES in casting solution. The morphology of the sPES added membranes was changed into a highly asymmetric structure. The active layer grew and mean pore size was decreased by addition of sPES. However, the water flux of PSF/sPES/DMF/PVP/BE membrane was higher than that of PSF/DMF/PVP/BE membrane.

• Membrane Journal
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• v.17 no.1
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• pp.23-30
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• 2007

Protein affinity membranes based on polyethersulfone (PES) and bovine serum albumin (BSA) were prepared by using an electrospinning method. The changes in the size of nanofiber according to the various conditions of electrospinning (concentration of spinning solution, voltage, flow rate, tip to collector distance) were investigated, and the preparation conditions of the affinity membrane were optimized. XPS and FT-IR results showed the firm incorporation of BSA with PES. It was found PES-BSA nanofibers could be prepared at the temp. of $20{\sim}22^{\circ}C$ and humidity of $45{\sim}55%$. The size of nanofibers increased with increase of the content of PES in the spinning solution while BSA did not affect much to the size of nanofiber. It was also revealed that the narrow size distribution of nanofiber could be obtained with PES 7 wt%, BSA 0.7 wt%, HFP 92.3 wt% at the electrospinning conditions of 1 mL/hr, 10 cm TCD, and 10 kV.

• Membrane Journal
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• v.19 no.1
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• pp.25-33
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• 2009

PES (polyethersulfone) membranes with highly enhanced their asymmetry were prepared by phase inversion process. The membranes were prepared by using PES/DMF (N,N-dimethylformamide)/TSA (p-toluenesulfonic acid)/PVP (polyvinylpyrrolidone) casting solution and water coagulant. The pre-coagulation of membrane surface which was induced by an addition of TSA as a demixing agent and PVP as a swelling polymer in the PES solution and humid exposure time, played a crucial role in determining morphological properties and the PWP (pure water permeation) performance. The PES solution was coated on polyester film under condition of 80% humidity for a while ($72{\sim}144$ sec) before immersing in a coagulation bath. The characterization of membranes was carried out by a capillary flow porometer, a FE-SEM and a permeation test apparatus. As the thickness of the smallest pore size layer (SPL) decreased, the asymmetry of membrane increased under conditions of 20 wt% of TSA and 10 wt% of PVP in 11 wt% of PES solution during longer humid contact time. As a result, the membranes showed a remarkable increase of PWP.

• Membrane Journal
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• v.20 no.1
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• pp.40-46
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• 2010

In this study, we manufactured the membrane using the polyethersulfone (PES) of fiber by using the electrospinning method. The polymer electrolyte membrane for fuel cells was manufactured by impregnating Nafion solution to the porous PES membrane. We confirmed that electrospun PES membrane has higher thermal stability than Nafion 212 membrane by thermogravimetric analysis. Impregnated Nafion in the pores of the electrospun PES membrane was characterized by scanning electron microscopy. The AC impedance data shows the hydrogen ionic conductivity of $10^{-2}$ S/cm below $100^{\circ}C$. Nafion impregnated PES membrane shows the maximum performance at $90^{\circ}C$ showing current density of 389 mA/$cm^2$ at 0.6 V, while Nafion 212 membrane shows maximum at $75^{\circ}C$.

• Korean Journal of Microbiology
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• v.47 no.1
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• pp.50-55
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• 2011

A simple and rapid method was developed for monitoring of Gram-positive bacteria in the wastewater treatment system. Culture suspensions of 4 Gram-positive and 4 Gram-negative strains were filtrated and stained with a polyethersulfone membrane filter and Toluidine Blue-O. To establish quantitative color image analysis, the intensity value of RGB (red-green-blue) color of a scanned filter image was analyzed with a photographic program. Red and green color values of Gram-positive bacteria were higher than those of Gram-negative bacteria. This method was applied to the activated sludge mixed with the Gram-positive bacteria. Although evaluation was difficult due to the irregular size and shape of flocs, the population of Gram-positive bacteria in the activated sludge could be monitored with floc dispersion technique. The more amounts of Gram-positive bacteria in the activated sludge led to the increase of red and green color values. This method provides a rapid and quantitative measurement of Gram-positive bacteria within the wastewater treatment systems.