• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.85.2-85.2
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• 2010

There is widespread effort to develop polymer membranes in place of Nafion for high temperature polymer electrolyte membrane fuel cell(PEMFC). In our study, SiO2 membranes are arranged by electrospinning method. For impregnation solution, the modified sulfonated poly(ether ether ketone)(SPEEK) polymer is prepared from sulfonation, sulfochlorination, partial reduction and lithiation reaction. The modified polymer is cross-linked with 1,4-diiodobetane in NMP solvent and then blended with Heteropoly acid(HPA). The characterization of membranes is confimed by FT-IR, Thermogravimetry(TGA), water uptake test and single cell performance test for PEMFC, etc. The composite membrane shows satisfactory thermal and mechanical properties. Beside, The membrane exhibits good ion exchange capacity and high proton conductivity. As a result, The composite membrane is promising as an alternative membrane in high temperature PEMFC.

• 멤브레인
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• 제26권2호
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• pp.146-151
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• 2016

술폰화 폴리아릴렌에테르술폰(SPAES) 랜덤 공중합체는 고분자 전해질 연료전지에 적용될 때 높은 수소이온전도도, 상대적으로 낮은 생산 단가 그리고 열화학적 저항성등과 같은 장점을 갖는다. 반면, SPAES 공중합체는 가혹한 구동 조건하에서 낮은 화학적 안정성과 치수 불안전성으로 인해 실제 연료전지 막에 직접적으로 적용하는데 어려움이 있다. 그에 타당한 해결책은 SPAES 공중합체를 상호 연결된 기공 구조와 높은 열화학적 강도를 가지는 지지체 필름(예 : 전기방사된 폴리이미드 지지체)에 함침시키는 것이다. 본 연구에서는 함침막 제조를 위한 이오노머로 빠른 이온 수송을 위해 높은 자유 체적을 유도하는 회전 그룹을 갖는 SPAES 공중합체를 선택하였다. 제작된 막의 실용가능성은 막 특성화를 통해 평가되었다.

• 한국의류산업학회지
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• 제14권1호
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• pp.122-129
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• 2012

To develop a waterproof breathable material, we fabricated three kinds of nanofiber web laminates using a massproduced electrospun nanofiber web with different substrates and layer structures. The waterproofness and breathability of nanofiber web laminates were evaluated after repeated launderings and compared with those of conventional waterproof breathable fabrics currently in use, including densely woven fabric, microporous membrane laminated fabric, and coated fabric. The durability of nanofiber web laminates, including adhesion strength, abrasion resistance, tensile strength, and tearing strength, was also assessed and compared with those of conventional waterproof breathable fabrics. The water vapor transmission of nanofiber web laminates increased slightly after repeated launderings, whereas the air permeability somewhat decreased after launderings but still maintained an acceptable level of air permeability. Laundering reduced the resistance to water penetration of nanofiber web laminates, which implies that laminating techniques or substrate materials that could support waterproofness of the laminated structure should be explored. The adhesion strength, abrasion resistance, tensile strength, and tearing strength of nanofiber web laminates were in a range comparable to conventional waterproof breathable materials.

• 한국염색가공학회지
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• 제23권2호
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• pp.107-117
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• 2011

Polyurethane (PU) was synthesized by one-shot process and the PU nanofiber was prepared by electrospinning. In this study, electrospun PU multi-membranes were prepared with various coating thickness ratio of base resin to top resin, where the base resin contains melamine curing agent and acid catalyst and the top resin contains water-repellent agent of fluoro-carbon compounds. The PU nanofiber multi-membranes were analyzed by field-emission scanning electron microscopy, differential scanning calorimeter, breathability, tensile strenth, air permeability and water resistance. The results showed that the PU multi-membrane provided excellent waterproof and moisture permeability.

• 한국결정성장학회지
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• 제33권3호
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• pp.104-109
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• 2023

Electrospinning was performed using an eco-friendly solvent composed of acetic acid, ethyl acetate and distilled water to investigate the effect of gelatin concentration on mechanical properties and cytotoxicity of absorbable poly(D,L-lactic acid) (PDLLA)/gelatin blend membrane. The tensile stress, strain at break, and WUC of the PDLLA/gelatin (97/3) scaffold at 26 wt% concentration were determined to be 3.9 ± 0.7 MPa, 37 ± 1.3 %, and 273 ± 33 %, respectively. FT-IR results revealed that PDLLA and gelatin were bound only by van der Waals interactions. The cell viability of PDLLA/gelatin membranes containing 0 %, 1 %, 2 %, 3 %, and 4 % gelatin were more than 100 %, which makes all membranes highly suitable as a barrier membrane for absorbable periodontal tissue regeneration due to their marketed physical properties and biocompatibility.

• 한국세라믹학회지
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• 제44권4호
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• pp.194-197
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• 2007

Polyacrylonitrile (PAN)/$Fe_2O_3$ nanocomposite membranes with a thickness of 0.02 mm were electrospun by adding 0 to 5 wt% of $Fe_2O_3$ into PAN. The surface tension, density, kinematic viscosity and dynamic viscosity of the PAN solution were determined to be $33.8{\pm}1mN/m$, 0.9794 g/ml, $1548.6mm^2/sec$ and 1516.7 cP, respectively. The average diameters of PAN fibers containing 0, 1 2, 3, and 4 wt% $Fe_2O_3$ particles were 300, 260, 210, 130, and 90 nm, respectively. Fourier-transform infrared spectroscopy results showed that the addition of $Fe_2O_3$ nanoparticles to the PAN mat reduced the absorption peak intensity at $2242cm^{-1}$ ($C{\equiv}N$ bond) while it caused a sharp increase in the peak intensity at $2356cm^{-1}$(C=O bond). Thus, it appears that an appropriate amount of $Fe_2O_3$ nanoparticles in the PAN backbone leads to an improvement of the performance of the $CO_2$ gas sensor, most likely due to the change of functional groups in the membrane.

• Korean Chemical Engineering Research
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• 제56권1호
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• pp.56-60
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• 2018

미세입자가 미치는 부정적인 영향으로 인해 관심이 증가하여 공기 중 미세입자를 제거할 수 있는 멤브레인 필터의 성능향상을 위해 다양한 방법을 도입하여 왔다. 필터 섬유 제조 기술 중 전기 방사 기술이 최근에 가장 주목을 받고 있으며, 수 백 nm에서 수 십 ${\mu}m$ 까지의 균일한 직경의 섬유를 제조 할 수 있는 장점을 가진다. 전기 방사 기술로 생성한 섬유는 초극세 섬유로서 섬유의 생성과 동시에 3차원의 네트워크로 적층된 형태의 다공성 웹은 초박막, 초경량이며 기존 섬유에 비해 부피 대비 표면적비가 높고, 높은 기공도를 가지는 멤브레인을 제조 할 수 있으므로, 전기 방사 멤브레인의 여과 필터 성능이 크게 향상 될 것으로 예상이 된다. 본 연구에서는 polystyrene, cellulose acetate 멤브레인 필터를 이용하여 섬유 두께, 탄소나노튜브의 조성비에 따른 필터로서의 여과성능을 살펴보았으며, 필터소재의 성능 비교실험 결과 적정량의 CNT 소재의 첨가로 인해 필터의 여과 성능이 향상되는 것을 알 수 있다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2010년도 춘계학술발표대회
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• pp.38.1-38.1
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• 2010

Nanofibers have a large potential in air filtration applications. In this work, we have developed a photocatalytic polyvinyl alcohol PVA/$TiO_2$ nanofibers membrane for the treatment of air filtration by using electrospinning method. PVA were electrospun into nanofibrous membranes and $TiO_2$ nanoparticles were loaded in PVA nanofibers in various contents from 10% (w/w) to 50% (w/w). The UV-Vis spectra were conducted for testing the existence of $TiO_2$ nanoparticles in PVA fibers. SEM analysis indicated that $TiO_2$ nanoparticles were loaded on the surface of PVA fibers and dispersed linearly along the fiber direction, which originated from the effect of polarization and orientation caused by high electric field. X-ray diffraction (XRD) was used to determine the crystalline of the membrane. Tensile strength was measured to evaluate the physical properties of the membrane. Therefore, our work suggested that PVA/$TiO_2$ nanofiber membrane has a potential application in air filtration area.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.251-252
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• 2007

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• Macromolecular Research
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• 제17권7호
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• pp.533-537
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• 2009

This paper introduces a modified electro spinning system for biomedical wound-healing applications. The conventional electrospinning process requires a grounded electrode on which highly charged electro spun ultrafine fibers are deposited. Biomedical wound-healing membranes, however, require a very low charge and a low level of remnant solvent on the electrospun membrane, which the conventional process cannot provide. An electrohydrodynamic process complemented with field-controllable electrodes (an auxiliary electrode and guiding electrodes) and an air blowing system was used to produce a membrane, with a considerably reduced charge and low remnant solvent concentration compared to one fabricated using the conventional method. The membrane had a small average pore size (102 nm) and high porosity (85.1%) for prevention of bacterial contamination. In vivo tests on rats showed that these directly electro spun fibrous membranes produced using the modified electro spinning process supported the good healing of skin bums.