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Yan-Chun Li,Fan-Long Jin,박수진 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.10
We report spinel-type CoFe2O4 nanocrystals (NCs) synthesized through facile hydrothermal growth and their attachment on a cage-like carbon (CC) for efficient and durable oxygen evolution/reduction reaction (OER/ORR) performance. As a catalyst, the so-constructed CoFe2O4 NCs show significantly higher OER performance than bare CoFe2O4 and CC, leading to an overpotential of 1.59 V for the OER at a current density of 10mA/cm. Furthermore, CoFe2O4 NCs on CC electrodes also exhibit good ORR performance, which is comparable to Pt/C, significantly higher than that of bare carbon fiber paper, and acts as a bifunctional electrocatalyst. The CoFe2O4 NCs anchored on the CC electrodes exhibit remarkably long-term stability, which is evaluated by continuous cycling (over 5,000 cycles), without any morphological change, but preserving all the materials within the electrode. The results indicate that the CoFe2O4 NCs have a promising potential for efficient, cost-effective, and durable oxygen electrocatalysis at large scales using earth-abundant materials and low-cost fabrication processes.
Interfacial toughness properties of trifunctional epoxy resins/calcium carbonate nanocomposites
Jin, Fan-Long,Park, Soo-Jin Elsevier 2008 Materials science & engineering. properties, micro Vol.475 No.1
<P><B>Abstract</B></P><P>In this study, the mechanical interfacial properties of trifunctional epoxy resin triglycidyl paraaminophenol (TGPAP)/CaCO<SUB>3</SUB> nanocomposites were studied by means of fracture toughness and impact strength testing, and subsequently, their morphology was examined by scanning electron microscope (SEM) and transmission electron microscopy (TEM). The fracture toughness and impact strength of the TGPAP/CaCO<SUB>3</SUB> nanocomposites were found to have been significantly increased by the addition of nano-CaCO<SUB>3</SUB>. The nanocomposites also showed a higher flexural strength than that of the neat epoxy system. Notably too, when the nano-CaCO<SUB>3</SUB> content was increased, the elastic modulus of the nanocomposites did not appreciably change. The SEM micrographs showed that CaCO<SUB>3</SUB> particle–epoxy debonding had occurred to prevent deformation and crack propagation in the TGPAP/CaCO<SUB>3</SUB> nanocomposites.</P>
Fan-Long Jin,박수진 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.5
Aromatic polyester was used as a modifier to improve the toughness of diglycidylether of bisphenol A (DGEBA)/thermally latent initiator system. N-Benzylquinoxalinium hexafluoroantimonate (BQH) was used as a thermally latent initiator for thermal curing, and the content of polyester was varied from 2.5 to 10 wt%. The thermal latent behaviors, thermal properties, and mechanical interfacial properties of DGEBA/ polyester blends were investigated with several techniques. It was found that the BQH as a latent initiator showed the activity at a comparably narrow temperature range in the present study. The KIC of the DGEBA/polyester blends was higher than that of the neat epoxy system and exhibited a maximum value at 5 wt% polyester. The scanning electron microscope (SEM) results showed rough and plastic deformation morphologies in the DGEBA/polyester blends.
Fracture and adhesion behaviors of epoxy resins modified with poly(amine-quinone)
Jin, Fan-Long,Han, Mijeong,Park, Soo-Jin John Wiley Sons, Ltd. 2006 Polymer international Vol.55 No.11
<P>An amine-quinone monomer, i.e. 2,5-bis(4,4′-methylenedianiline)-1,4-benzoquinone (BB), was synthesized by the Michael addition of 4,4′-diaminodiphenyl methane with 1,4-benzoquinone. To evaluate the effect of BB content on the glass transition temperature (T<SUB>g</SUB>) and crosslinking density (ρ) of cured diglycidyl ether of bisphenol A (DGEBA)/BB systems, storage modulus and loss factor measurements were obtained using dynamic mechanical analysis. The mechanical properties of the systems were determined in terms of the fracture toughness, impact strength, and adhesion strength. As a result, the ρ values of the systems were found to decrease systematically as the BB content increased. The fracture toughness and adhesion strength of the systems increased with increasing BB content. These results indicate that the addition of BB into epoxy resins increases the free volume of the epoxy network and absorbs the deformation energy, resulting in an improvement of the mechanical properties of the DGEBA/BB systems. Copyright © 2006 Society of Chemical Industry</P>
Fan-Long Jin,Heng Zhang,Shan-Shan Yao,박수진 한국고분자학회 2018 Macromolecular Research Vol.26 No.3
Silicon carbide (SiC) nanoparticles were surface modified using a silane coupling agent, and their properties were characterized using Fourier transform infrared, thermogravimetric analysis, and scanning electron microscope. Biodegradable poly(lactic acid) (PLA) composites were manufactured from PLA and SiC nanoparticles using a solution-blending method. The effect of SiC surface modification on the impact strength, flexural strength, and morphology of the PLA/SiC nanocomposites was studied. The impact strength of the PLA/surface-modified SiC (S-SiC) nanocomposites improved remarkably with increasing S-SiC content and scanning electron micrographs revealed that the PLA/S-SiC nanocomposites possessed a more ductile fracture surface than neat PLA or the PLA/SiC nanocomposites.