• 한국전기화학회:학술대회논문집
• /
• 2003.07a
• /
• pp.225-228
• /
• 2003

• Membrane Journal
• /
• v.3 no.1
• /
• pp.12-21
• /
• 1993

세라믹 분리막은 알루미나($Al_2O_3$), 지르코니아($ZrO_2$), Carbon, 실리콘 카바이드, 스테인레스 등의 무기재료를 이용하여 제조된 분리막이다. 압출성형공정으로 제조된 지지체는 1700$^{\circ}C$ 이상의 소결공정을 거치므로 지지체 상단에 슬러리 코팅공정으로 형성된 얇은 막에게 안정된 분리기능을 수행할 수 있도록 커다란 물리적 강도를 제공한다. 따라서, 세라믹 분리막은 다공성 세라믹 구조를 갖는 특징적인 두 개 또는 세 개의 균일한 층으로 구성된 복합막이라 할 수 있다.

• Polymer Science and Technology
• /
• v.15 no.4
• /
• pp.430-437
• /
• 2004

인간 게놈 프로젝트 완성 및 간세포 (Stem cell) 발견으로 미래에는 현재 의학적 치료의 한계를 극복하는 의학적 혁명이 예상되고 있다. 간세포를 이용한 치료기술 개발을 위하여서는 균일한 간세포의 대량배양, 원하는 세포로의 균일한 분화, 면역학적 안전성 등이 매우 중요한 이슈가 되고 있으며 이의 해결을 위하여서는 생체적합성이 우수한 지지체의 개발이 기본이 되고 있다. (중략)

• Polymer(Korea)
• /
• v.32 no.5
• /
• pp.458-464
• /
• 2008

A successful scaffold should have a highly porous structure and good mechanical stability. High porosity and appropriate pore size provide structural matrix for initial cell attachment and proliferation enabling the exchange of nutrients between the scaffold and environment. In this paper the highly porous scaffold of poly(${\varepsilon}$-caprolactone) electrospun nanofibers could be manufactured with an auxiliary electrode and chemical blowing agent (BA) under several processing conditions, such as the concentration of PCL solution, weight percent of a chemical blowing agent, and decomposition time of a chemical blowing agent. To attain stable electrospinnability and blown nanofiber mats having high microporosity and large pore, a processing condition, 8wt% of PCL solution and 0.5wt% of a chemical blowing agent under $100^{\circ}C$ and decomposition time of $2{\sim}3\;s$, was used. The growth characteristic of human dermal fibroblasts cells cultured in the mats showed the good adhesion and proliferation on the blown mat compared to a normal electrospun mat.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2014.11a
• /
• pp.156-157
• /
• 2014

수소 분리막은 수소 분리층과 지지체로 구분되며, 수소 분리막의 수소 투과 및 선택도는 지지체의 표면조도, 평탄도 및 거대기공 크기에 크게 의존한다. 본 연구에서는 표면연마 및 $ZrO_2$ 파우더 매립을 사용한 표면처리 공정을 통해 다 공성 스테인레스 강 지지체의 표면조도 및 평탄도와 거대기공을 제어함으로써 균일하고 치밀한 분리층을 형성 할 수 있었으며, 상용화 공정($350^{\circ}C{\sim}500^{\circ}C$, 1bar(${\Delta}P$))에서 무한대의 수소 선택도와 $17.5ml/min{\cdot}cm^2{\cdot}atm$의 수소 투과도를 얻을 수 있었다.

• Membrane Journal
• /
• v.18 no.2
• /
• pp.185-190
• /
• 2008

In a previous study, we probed the potential of poly(styrene sulfonate) (PSS)/poly(diallyldimethylammonium chloride) (PDADMAC) nanofiltration (NF) membranes for the separation of monovalent anions, with an emphasis on the selective rejection of $F^-$. Remarkably, deposition of $(PSS/PBADMAC)_4PSS$ films on porous alumina supports yielded membranes that exhibited $Cl^-/F^-$ selectivity > 3 with minimal $Cl^-$ rejection, and a solution flux of $3.5m^3/m^2$-day at 4.8 bar. When the number of PSS/PDADMAC bilayers was increased from 4.5 to 5.5, however, $F^-$ rejection decreased from 73% to 50% and $Cl^-/F^-$ selectivity dropped to 1.9. Addition of another bilayer to form $(PSS/PDADMAC)_6$ PSS films resulted in a significant increase in $Cl^-$ rejection to give essentially no $Cl^-/F^-$ selectivity. The decrease of selectivity with deposition of more than 4.5 bilayers was not expected and it was unclear whether this characteristic was substrate independent. In this study, to investigate the effect of substrates on NF performance of multilayer polyelectrolyte membranes, PSS/PDADMAC films were deposited on 50 kDa polyethersulfone (PES) ultrafiltration supports instead of porous alumina supports. The results indicate that, although fluoride rejection and the number of bilayers at which a maximum $F^-$ rejection occurs are different, the trend is similar for both types of substrates. Therefore, we can conclude that the M: characteristics of multilayer polyelectrolyte membranes may be substrate independent.

• Polymer(Korea)
• /
• v.31 no.6
• /
• pp.505-511
• /
• 2007

Poly(lactide-co-glycolide)(PLGA) and hyaluronic acid (HA) has been widely used as biocompatible scaffold materials to regenerate tissue. In this present study, we fabricated microporous PLGA and HA loaded PLGA scaffolds by a emusion freeze-drying method. In order to confirm that the release profile of cytokine or water-soluble drugs, we manufactured the granulocyte macrophage colony stimulating factor(GM-CSF) loaded PLGA and HA-PLGA scaffold. All scaffolds were characterized using scanning electron microscope(SEM), mercury porosimeter and wettability measurement. Cell proliferation and viability were assessed by a 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium-bromide (MTT) test. The porosity of HA-PLGA scaffold was greater than 95% with the total pore area of $261\;m^2/g$. The HA-FLGA scaffold exhibited well interconnected pores to allow greater cell adhesion and prolixferation. It was proven by higher cell viability in the HA-PLGA scaffold than PLGA alone. This may be due to the enhanced natural properties and higher water retention capacity of HA.

• Membrane Journal
• /
• v.24 no.4
• /
• pp.317-324
• /
• 2014

It is very well known that the conventional polyamide (PA) thin film composite (TFC) reverse osmosis (RO) membranes have excellent permselective properties, but their chlorine tolerance is not good enough. In this study, to improve such chlorine tolerance, microporous membranes containing hydrophilic functional groups such as -COOH were used as a support to prepare PA TFC RO membranes, employing the conventional interfacial polymerization method. Meta-phenylene diamine (MPD) and 2,6-diamine toluene (2,6-DAT) were used as diamine monomers and tri-mesoyl chloride (TMC) as an acid monomer. The membranes prepared were characterized using various instrumental analytical methods and permeation test set-up. The flux obtained from the membranes prepared so was more than $1.0m^3/m^2day$ at 800 psi of operating pressure, while the salt rejection was over 99.0%. The chlorine tolerance of them was also found to be better than that of the membrane prepared by using conventional polysulfone support without hydrophilic functional groups.

• Polymer(Korea)
• /
• v.36 no.5
• /
• pp.651-655
• /
• 2012

Considerable effort has been directed toward the use of silk fibroin as a biotechnological material in biomedical applications on account of its excellent biodegradability, biocompatibility, and unique mechanical properties. For use in tissue engineering, it is very important to design and control the pore architecture of polymeric scaffolds, which provide the vital framework for seeded cells to organize into functioning tissue. In the present study, a silk fibroin scaffold with controlled interconnectivity and pore size was prepared using an electrospinning method with poly(ethylene oxide).

• Membrane Journal
• /
• v.33 no.6
• /
• pp.383-389
• /
• 2023

A high-performance forward osmosis (FO) membrane was prepared using polyethylene glycol diacrylate (PEGDA) hydrogel as a support layer. Through the UV-induced polymerization and subsequent phase separation of PEGDA, the crosslinked, hydrophilic, and porous PEGDA suppor layer was obtained. To achieve high FO flux and salt selectivity using the fabricated PEGDA support, a selective layer was synthesized via the toluene-assisted interfacial polymerization (TIP), in which toluene is used as an organic solvent. The prepared PEGDA-based FO membrane showed higher FO water flux and lower salt selectivity compared with commercial HTI membranes using 1.0 M NaCl draw solution and DI water feed solution. We propose the strategy to fabricate high-performance FO membranes utilizing supports formed with new hydrophilic materials and fabrication processes.