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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.
Fracture toughness and surface morphology of poly(lactic acid)/poly(ε-caprolactone) blends
( Fan-long Jin ),( Tian-yi Zhang ),( Qing-qing Pang ),박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Poly(lactic acid) (PLA) is considered a material highly suited for industrialization because of its many advantages. However, despite its high tensile modulus and strength, one of the drawbacks of PLA is its poor toughness due to the stiff backbone chain, which restricts its use in many fields. Bio-based PLA blends were prepared by the solution blending of PLA and poly(ε-caprolactone) (PCL). The effect of PCL content on the fracture toughness, mechanical properties, and morphology of PLA was investigated using several techniques. As a result, the fracture toughness of PLA was significantly improved by the addition of PCL.
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>
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>
Thermal and mechanical properties of poly(lactic acid)-based ternary composites
( Fan-long Jin ),( Qing-qing Pang ),( Tian-yi Zhang ),박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Bio-based poly(lactic acid) (PLA) ternary composites were prepared by the solution blending of PLA, polybutylene succinate (PBS), and nano-CaCO3. The effects of PBS and nano-CaCO3 on the thermal stability,fracture toughness, mechanical properties, and morphology of PLA were investigated using several techniques. The morphology of the composites was observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). As a result, the fracture toughness and flexural strength of PLA were improved by the introduction of PBS and further enhanced by the addition of nano-CaCO3.