• Title/Summary/Keyword: PAN nano fiber

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Properties of Reduced Polyacrylonitrile Nano Fiber (I) (폴리아크릴로니트릴 나노섬유의 환원 및 특성 (I))

  • Choi Chang-Nam;Park Won-Kyu;Lee Woong-Eui
    • Textile Coloration and Finishing
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    • v.18 no.2 s.87
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    • pp.1-7
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    • 2006
  • In order to prepare PAN nano fiber web, PAN/DMF solution was prepared and electrospun. The diameter of fiber was depended on the polymer concentration (7.5-15wt%) and the applied voltage (10-16kV). The average diameter of fiber increased with an increase of the polymer concentration and decreased with the applied voltage. At 7.5wt% concentration, many beads were found. So, we prepared a nano PAN fiber by electrospinning at concentration of 10wt% and 16kV. PAN fibers were reduced with litium aluminium hydride and the dyeability to acid dye was checked. The reduced nano PAN fiber showed much better dyeability compared with the reduced ordinary PAN fiber. It was considered that the increase of specific surface area have an important role in dyeing with acid dye.

Strength Increase of Medium Temperature-carbonized PAN Nano Fibers Made by Mechano-electrospinning

  • Kim, J.H.;Bajaj, B.;Yoon, S.J.;Kim, S.H.;Lee, J.R.
    • Composites Research
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    • v.26 no.3
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    • pp.160-164
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    • 2013
  • In this study, the effect of phosphoric acid (PA) as a fiber spinning aid on the strength increase of polyacrylonitrile (PAN) nano-fibers by using modified mechano-electrospinning technologies has been analyzed. The medium carbonization temperature of $800^{\circ}C$ has been selected for the future economic production of these new materials. The concentration of PAN in dimethyl sulfoxide (DMSO) was fixed as 5 wt%. The weight fraction of PA was selected as being 2%, 4%, 6%, and 8% in comparison to PAN. These solutions have been used to make the nanofibers. The mechano-electrospinning apparatus installed in KRICT was made by our own design. By using this apparatus the continous and highly aligned precursor nano-fibers have been obtained. The bundle of 50 well aligned nano diameter continuous fibers with the diametr of 10 microns with 6 wt% phosphoric acid for addition showed maximum mechanical properties of 1.6 GPa as tensile strength and 300 GPa as Young's modulus. The weight of final product can be increased 19%, which can improve the economical benefits for the application of these new materials.

First-principle investigations of the binding between carbon nanotubes and poly(acrylonitrile)

  • Lee, Juho
    • Proceeding of EDISON Challenge
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    • 2015.03a
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    • pp.304-307
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    • 2015
  • Carbon nanotubes (CNTs) have been widely accepted and used as the enhancer for polymer nano-composites due to their remarkable mechanical properties. Understandably, the CNT fiber-polymer matrix interface plays a major role in determining the properties of the CNT-polymer nano-composites. Here, using the LCAODFT Lab tool available on the EDISON Nano-Physics site, we performed first-principles density-functional theory calculations to determine the atomic configurations and binding energies of the CNTs in contact with polymers. For the polymer matrixes, we chose poly(acrylonitrile) (PAN), which is one of the most well-known polymer matrixes for the carbon nanofiber nanocomposites. Different chiralities and diameters of pristine CNTs were considered, and several PAN-CNT configurations were prepared based on the atomistic positions and directions of cyano group in PAN. The most favorable configuration of PAN was obtained when the PAN bound parallel to the surface of CNT. Our finding indicates the binding configurations are determined by the direction of the cyano group dominantly rather than the atomistic position of PAN, or the symmetry of CNTs. The result of increasing the length of CNT diameter suggests that PAN is inclinable to align evenly on the surface of relatively large size of CNT with the configuration parallel to the surface. These results obtained in this study will provide the starting point for the design of improved PAN-CNT composites for the next-generation ultra-strong and ultra-light carbon nanofibers.

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Hydrolyzed PAN Hollow Fiber PVA Composite Membrane for Pervaporation Separation of Water-ethanol Mixtures (가수분해된 PAN 중공사 PVA 복합막을 이용한 물-에탄올 계의 투과증발 분리)

  • Kang, Su Yeon;Kim, So Yeon;Cheong, Seong Ihl;Seo, Chang Hee;Park, Hun Whee;Rhim, Ji Won
    • Membrane Journal
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    • v.23 no.4
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    • pp.283-289
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    • 2013
  • Poly(vinyl alcohol) (PVA) coating solution containing glutaraldehyde (GA) and maleic anhydride (MA) as crosslinking agents was coated onto hydrolyzed poly acrylonitrile (PAN) hollow fiber membranes. The permselectivities of the resulting composite membranes prepared varying the reaction temperature and the concentration of the crosslinking agents were tested for 90 wt% ethanol aqueous mixtures by the pervaporation technique at $60^{\circ}C$. In general, the flux decreased while the selectivity increased for the increases of the reaction temperature and the crosslinking concentration. In case of GA as a crosslinking, the flux $165g/m^2hr$ and the separation factor 81 were obtained at GA 11 wt% and the reaction temperature $120^{\circ}C$. And for the case of MA, the flux $174g/m^2hr$ and the separation factor 73 were obtained at MA 11 wt% and the reaction temperature $120^{\circ}C$.

Preparation and Characterization of Electrospun PAN/TiO2 Fiber Mat by Electron Beam Irradiation (전자선 조사에 의한 PAN/TiO2 전기방사 나노섬유 제조 및 특성분석)

  • Kang, Phil-Hyun;Jeun, Joon-Pyo;Seo, Dong-Kwon;Kim, Hyun-Bin;Nho, Young-Chang
    • Polymer(Korea)
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    • v.36 no.1
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    • pp.47-52
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    • 2012
  • Abstract: In this study, PAN/$TiO_2$ fiber mats were fabricated from polyacrylonitrile (PAN) and titanium(IV) butoxide ($Ti(OBu)_4$) by an electrospinning method with various solution concentrations, applied voltages and solution flow rates. The fiber mats were irradiated with an electron beam to induce structural crosslinking and enhance photocatalytic activity. As a result, uniform and bead-free fibers without pits or cracks on surface were obtained at 5 wt% of $Ti(OBu)_4$ solution with 15 kV and 0.02 mL/min flow rate. The PAN/$TiO_2$ fiber mats were irradiated with an electron beam of 1.14 MeV acceleration voltage, 4 mA of current and $1{\times}10^4kGy$. Electron beam irradiation was enhanced the photocatalytic activity of PAN/$TiO_2$ nano fiber mat. The photocatalytic activity of the PAN/$TiO_2$ fiber mat was analyzed by degradation of methylene blue and volatile organic compounds.

The Effect of Processing Parameters on the Diameter of Electrospun Polyacrylonitrile(PAN) Nano Fibers (전기방사한 폴리아크릴니트로 나노섬유의 직경에 미치는 공정인자의 영향)

  • 강영식;김학용;류영준;이덕래;박수진
    • Polymer(Korea)
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    • v.26 no.3
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    • pp.360-366
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    • 2002
  • The electrospinning of polyacrylonitrile dissolved in N,N-dimethyl formamide (DMF) successfully produced nano-scale fibers. The processing parameters such as charged voltage, velocity of collected roller, and tip-to-collector distance (TCD) , affected the ultimate fiber size. At TCD of 5 cm, the average tiber diameter increased with increasing charged voltage because of the more aggregation between fibers due to the remaining DMF solvent on the fiber surface. But, at TCD of 9 cm, the average fiber diameter decreased as the charged voltage was increased because of complete evaporation of DMF. Also, the fiber diameter decreased with increasing the velocity of collected roller. Cross direction width (CWD) of nonwoven mat increased with decreasing the charged voltage and with increasing TCD.

Photocatalytic degradation and antibacterial investigation of nano synthesized Ag3VO4 particles @PAN nanofibers

  • Saud, Prem Singh;Ghouri, Zafar Khan;Pant, Bishweshwar;An, Taehee;Lee, Joong Hee;Park, Mira;Kim, Hak-Yong
    • Carbon letters
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    • v.18
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    • pp.30-36
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    • 2016
  • Well-dispersed Ag3VO4 nanoparticles @polyacrylonitrile (PAN) nanofibers were synthesized by an easily controlled, template-free method as a photo-catalyst for the degradation of methylene blue. Their structural, optical, and photocatalytic properties have been studied by X-ray diffraction, transmission electron microscopy, field-emission scanning electron microscopy equipped with rapid energy dispersive analysis of X-ray, photoluminescence, and ultraviolet-visible spectroscopy. The characterization procedures revealed that the obtained material is PAN nanofibers decorated by Ag3VO4 nanoparticles. Photocatalytic degradation of methylene blue investigated in an aqueous solution under irradiation showed 99% degradation of the dye within 75 min. Finally, the antibacterial performance of Ag3VO4 nanoparticles @PAN composite nanofibers was experimentally verified by the destruction of Escherichia coli. These results suggest that the developed inexpensive and functional nanomaterials can serve as a non-precious catalyst for environmental applications.

Studies on Preparation and Performance of Poly(acrylonitrile) Nano-composite Hollow Fiber Membrane through the Coating of Hydrophilic Polymers (친수성 고분자의 코팅을 통한 Poly(acrylonitrile) 나노복합중공사막의 제조 및 성능 연구)

  • Park, Cheol Oh;Rhim, Ji Won
    • Membrane Journal
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    • v.29 no.3
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    • pp.140-146
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    • 2019
  • In this study, a selective layer of poly styrene sulfonic acid (PSSA) and polyethyleneimine (PEI) was formed by layer-by-layer method onto a porous polyacrylonitrile (PAN) hollow fiber membrane as the suppoter membrane. The salting out method was used by adding Mg salt to the coating solution. Several experimental conditions of the ionic strength, polymer concentration, and coating time were investigated, and the flux and rejection were measured at the operating pressure of 2 atm for 100 mg/L of NaCl, $MgCl_2$, and $CaSO_4$ as the feed solution. The membranes coated with PSSA 20,000 ppm, coating time 3 minutes, ionic strength 1.0, PEI 30,000 ppm, coating time 1 minute, and ionic strength 0.1 were observed the best. In the 100 ppm NaCl, $MgCl_2$, and $CaSO_4$ feed solutions, the flux of 20.4, 19.4, and 18.7 LMH, and the rejection of 67, 90, and 66.6%, respectively.

A Study on Optimization of Manufacture Conditions for Water Treatment Membrane by Using Electrospinning Method (전기방사법을 이용한 수처리용 막 제조 조건 최적화 연구)

  • Lee, Sang Hyun;Choi, Sung Yeol;Chang, Soon Woong;Kim, Sung Su
    • Journal of Korean Society of Environmental Engineers
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    • v.39 no.8
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    • pp.456-461
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    • 2017
  • In this study, nano fibers with various physical properties were materialized by using a variety of polymers [PAN (Polyacrylonitrile), PU (Polyuretane), PSU (Polysulfone)] which are raw materials of dope solution manufactured for electrospinning and solvents [NMP (N-methyl-2 pyrrolidone), DMF (Dimethylformamide)] and evaluated characteristics of their flux and SS (Suspended Solids) separation and then ascertained application of manufactured fibers as separation membrane for water treatment. In this study, analysis of surface of manufactured material was carried out through SEM analysis to ascertain the cause of flux and SS separation performance by checking diameter, uniformity and straightness of fiber. If additive is used in manufacturing nano fiber water treatment separation membrane, it is expected to solve problems such as membrane fouling and mechanical strength and to be used as basic factor for manufacturing separation membrane with catalyst function added.