Duck Joo Yang

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Facile synthesis of copper oxide nanoparticles‐decorated polyaniline nanofibers with enhanced electrochemical performance as supercapacitor electrode

Md. Wasi Ahmad, Surbhi Anand, Atiya Fatima, Duck‐Joo Yang, more

Polymers for Advanced Technologies > 32 > 10 > 4070 - 4081

Copper oxide‐decorated polyaniline nanofibers (CuO@PANiNFs) nanocomposite was prepared through in situ chemical deposition of CuO nanoparticles on the PANiNFs. The results of spectroscopic analyses suggested the presence of strong interfacial interactions between CuO nanoparticles and PANiNF matrix, while X‐ray diffraction (XRD) analysis confirmed the formation of CuO monoclinic crystal phase on PANiNFs...

article

Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile-based carbon fibers

Doo-Won Kim, Dae Ho Kim, Sung Ryong Kim, Bo-Hye Kim, more

Carbon Letters > 2019 > 29 > 5 > 479-485

This study demonstrates that low processing rate for producing polyacrylonitrile (PAN)-based carbon fiber is a critical to obtain a homogeneous radial microstructure with high resistance to oxidation, thereby resulting in their improved mechanical strength. The dry-jet wet spun PAN organic fibers were processed (e.g., stabilized and then carbonized) utilizing two different rates; one is 1.6 times...

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Facile synthesis of self-standing binder-free vanadium pentoxide-carbon nanofiber composites for high-performance supercapacitors

Arup Choudhury, Ji-Hoon Kim, Kap-Seung Yang, Duck-Joo Yang

Electrochimica Acta > 2016 > 213 > C > 400-407

Vanadium pentoxide (V₂O₅) thin layers were hydrothermally deposited on self-standing carbon nanofibre (CNF) paper, which was fabricated through electrospinning of polyacrylonitrile (PAN) precursor solution followed by thermal stabilization and carbonization. The prepared V₂O₅/CNF nanocomposite paper was characterized by various spectroscopic and microscopic techniques. The electrochemical performance...

article

Perfluorocyclobutyl (PFCB)-based polymer blends for proton exchange membrane fuel cells (PEMFCs)

Grace Jones D. Kalaw, Judy Anne N. Wahome, Yuanqin Zhu, Kenneth J. Balkus, more

Journal of Membrane Science > 2013 > 431 > Complete > 86-95

A phase-separated morphology, as observed in block copolymers, for proton exchange materials (PEM) is expected to result in improved PEM fuel cell performance. Blending hydrophilic and hydrophobic polymers provides an easier route to this phase-separated morphology especially for an otherwise difficult block copolymer synthesis. Blends of hydrophilic and hydrophobic perfluorocyclobutyl (PFCB) polymers...

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Nafion-sulfonated dendrimer composite membranes for fuel cell applications

Anjalee D. Liyanage, John P. Ferraris, Inga H. Musselman, Duck-Joo Yang, more

Journal of Membrane Science > 2012 > 392-393 > Complete > 175-180

Novel proton conducting composite membranes were synthesized by blending Nafion ^® polymer with sulfonated organosilicon dendrimers (G3-S). Blending G3-S with Nafion resulted in stable, flexible membranes with loadings up to 10% by weight. The high amount of sulfonic acid groups on the dendrimer increased the ion exchange capacity and improved the water retention capability of the composite...

article

Fabrication of cellulase protein fibers through concentric electrospinning

Daniel N. Tran, Duck-Joo Yang, Kenneth J. Balkus

Journal of Molecular Catalysis. B, Enzymatic > 2011 > 72 > 1-2 > 1-5

Cellulase catalyzes the hydrolysis of cellulose to glucose and is of great interest for biofuel production. Cellulase fibers with diameters ranging from 100 to 500nm were fabricated for the first time by core–shell electrospinning. The enzymes in the core were cross-linked using glutaraldehyde and the PEO outer shell washed away using water and methanol to produce a free standing nonwoven enzyme fiber...

article

Enhanced production of bioethanol and ultrastructural characteristics of reused Saccharomyces cerevisiae immobilized calcium alginate beads

Kwang Ho Lee, In Seong Choi, Young-Gyu Kim, Duck-Joo Yang, more

Bioresource Technology > 2011 > 102 > 17 > 8191-8198

Yeast immobilized on alginate beads produced a higher ethanol yield more rapidly than did free yeast cells under the same batch-fermentation conditions. The optimal fermentation conditions were 30°C, pH 5.0, and 10% initial glucose concentration with 2% sodium alginate beads. The fermentation time using reused alginate beads was 10–14h, whereas fresh beads took 24h, and free cells took 36h. All bead...

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Enhanced enzymatic hydrolysis of rapeseed straw by popping pretreatment for bioethanol production

Seung Gon Wi, Byung Yeoup Chung, Yoon Gyo Lee, Duck Joo Yang, more

Bioresource Technology > 2011 > 102 > 10 > 5788-5793

The objective of this study was to find a pretreatment process that enhances enzymatic conversion of biomass to sugars. Rapeseed straw was pretreated by two processes: a wet process involving wet milling plus a popping treatment, and a dry process involving popping plus dry milling. The effects of the pretreatments were studied both in terms of structural and compositional changes and change in susceptibility...

article

Polar solvent soluble and hydrogen absorbing polyaniline nanofibers

Abdelaziz Rahy, Touria Rguig, Sung June Cho, Christopher E. Bunker, more

Synthetic Metals > 2011 > 161 > 3-4 > 280-284

Polar solvent soluble polyaniline nanofibers were synthesized from aniline in the presence of organic additive such as sucrose, C ₁₂ H ₂₂ O ₁₁ or sucralose, C ₁₂ H ₁₉ Cl ₃ O ₈ , by oxidative polymerization. These nanofibers synthesized in the presence of the additive were soluble in water as well as in other polar organic solvents such as methanol,...

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The potential value of the seaweed Ceylon moss (Gelidium amansii) as an alternative bioenergy resource

Seung Gon Wi, Hyun Joo Kim, Shobana Arumugam Mahadevan, Duck-Joo Yang, more

Bioresource Technology > 2009 > 100 > 24 > 6658-6660

Sea weed (Ceylon moss) possesses comparable bioenergy production potential to that of land plants. Ceylon moss has high content of carbohydrates, typically galactose (23%) and glucose (20%). We have explored the possibility of sodium chlorite in Ceylon moss pretreatment that can ultimately increase the efficiency of enzymatic saccharification. In an acidic medium, chlorite generates ClO ₂ ...

article

Synthesis of highly conductive polyaniline nanofibers

Abdelaziz Rahy, Duck Joo Yang

Materials Letters > 2008 > 62 > 28 > 4311-4314

Polyaniline nanofiber product synthesized by using both potassium biiodate, KH(IO ₃ ) ₂ , and sodium hypochlorite oxidant shows high electrical conductivity of greater than 100 S cm ⁻¹ . The nanofiber product also shows not only a long nano-size fibril structure with average diameter of ~50 nm and length of ~4 μm but also high crystallinity. It was observed that the nanofibers...

article

Proton-conducting membranes based on HTFSI-doped PEI/SiO2 nanocomposites

Zhiwei Yang, Decio H. Coutinho, Duck-Joo Yang, Kenneth J. Balkus, more

Journal of Membrane Science > 2008 > 313 > 1-2 > 91-96

Novel proton-conducting membranes comprising polymer/inorganic materials based on linear polyethyleneimine (LPEI)/SiO ₂ nanocomposites synthesized through sol–gel processing have been prepared. 3-Glycidyloxypropyl-trimethoxysilane (GLYMO) has been used to cross-link the LPEI to afford improved heat resistance. The addition of trifluoromethanesulfonimide (HTFSI) during membrane processing doped...

INFONA - science communication portal

Search results for: Duck Joo Yang

Facile synthesis of copper oxide nanoparticles‐decorated polyaniline nanofibers with enhanced electrochemical performance as supercapacitor electrode

Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile-based carbon fibers

Facile synthesis of self-standing binder-free vanadium pentoxide-carbon nanofiber composites for high-performance supercapacitors

Perfluorocyclobutyl (PFCB)-based polymer blends for proton exchange membrane fuel cells (PEMFCs)

Nafion-sulfonated dendrimer composite membranes for fuel cell applications

Fabrication of cellulase protein fibers through concentric electrospinning

Enhanced production of bioethanol and ultrastructural characteristics of reused Saccharomyces cerevisiae immobilized calcium alginate beads

Enhanced enzymatic hydrolysis of rapeseed straw by popping pretreatment for bioethanol production

Polar solvent soluble and hydrogen absorbing polyaniline nanofibers

The potential value of the seaweed Ceylon moss (Gelidium amansii) as an alternative bioenergy resource

Synthesis of highly conductive polyaniline nanofibers

Proton-conducting membranes based on HTFSI-doped PEI/SiO2 nanocomposites

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