Jong-Kyoo Park
Agency for Defense Development
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Featured researches published by Jong-Kyoo Park.
Advanced Composite Materials | 2011
Joung-Man Park; Jung-Hoon Jang; Zuo-Jia Wang; Dong-Jun Kwon; Ga-Young Gu; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries
Studies of dispersion and related properties, in carbon nanotube/epoxy composites, were conducted using electro-micromechanical and wettability tests. Specimens were prepared from neat epoxy as well as composites with untreated and acid-treated carbon nanotube (CNT). The degree of dispersion and its standard deviation were evaluated by turbidity of the dispersing solution, as well as by volumetric electrical resistivity. Acetone was a better dispersing solvent than purified water and various acid treatments of the CNT also enhanced dispersion. Contact resistivity responded differently with dispersion degree. The apparent Youngs modulus was higher for composites with acid treated CNT. The interfacial shear strength between a single carbon fiber and CNT/epoxy was lower than that between a single carbon fiber and neat epoxy. This difference is attributed to increased viscosity and decreased bonding availability in the matrix due to the added CNT. The optimum CNT treatment, for maximizing interfacial adhesion while maintaining good electrical conductivity was the sulfuric acid treatment. The CNT composites can also sense micro-damage in terms of the stepwise increments of electrical resistivity combined with acoustic emission.
Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS and Nanodevices VIII | 2009
Joung-Man Park; Jung-Hoon Jang; Zuo-Jia Wang; Joel GnidaKouong; Duc-Huyen Ngo; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries
Self-sensing and dispersive evaluation were investigated with different dispersion solvents for single carbon fiber/acid treated carbon nanotube (CNT)-epoxy composites by electro-micromechanical technique and acoustic emission (AE) under cyclic loading/subsequent unloading. Gradient nanocomposite specimen was used to obtain contact resistivity using two- and four-probe method. Optimized dispersion procedure was set up to obtain improved mechanical and electrical properties. The case using good dispersion solvent exhibited higher apparent modulus and lower electrical contact resistivity for both the untreated and acid-treated CNT-epoxy composites. It is because of better stress transferring effect and enhanced interfacial adhesion. Micro-damage sensing was also detected simultaneously by AE combined with electrical resistance measurement. It exhibited the stepwise increase with progressing fiber fracture due to the maintaining numerous electrical contacts of CNT. Thin network of CNT by dipping method was formed on glass substrate to obtain conductive and transparent plate by UV transmittance.
MRS Proceedings | 2008
Joung-Man Park; Jung-Hoon Jang; Zuo-Jia Wang; Pyung-Gee Kim; Woo-Il Lee; Jong-Kyoo Park; Lawrence K. DeVries
Self-sensing and interfacial evaluation were investigated with different dispersion solvents for single carbon fiber/carbon nanotube (CNT)-epoxy composites by electro-micromechanical technique and acoustic emission (AE) under loading/subsequent unloading. Optimized dispersion procedure was set up to obtain improved mechanical and electrical properties. Apparent modulus and electrical contact resistivity for CNT-epoxy composites were correlated with different dispersion solvents for CNT. CNT-epoxy composites using good dispersion solvent showed higher apparent modulus because of better stress transferring effect due to relatively uniform dispersion of CNT in epoxy and enhanced interfacial adhesion between CNT and epoxy matrix. However, good solvent showed high apparent modulus but low thermodynamic work of adhesion, Wa for single carbon microfiber/CNT-epoxy composite. It is because hydrophobic high advanced contact angle was shown in good solvent, which can not be compatible with carbon microfiber well. Damage sensing was also detected simultaneously by AE combined with electrical resistance measurement. Electrical resistivity increased stepwise with progressing fiber fracture due to the maintaining numerous electrical contact by CNT.
Composites Part B-engineering | 2014
Joung-Man Park; Dong-Jun Kwon; Zuo-Jia Wang; Jeong-U Roh; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries
Composites Part B-engineering | 2014
Zuo-Jia Wang; Dong-Jun Kwon; Ga-Young Gu; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries; Joung-Man Park
Composites Part A-applied Science and Manufacturing | 2009
Joung-Man Park; Zuo-Jia Wang; Jung-Hoon Jang; Joel Renaud N. Gnidakoung; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries
Composites Part B-engineering | 2012
Joung-Man Park; Zuo-Jia Wang; Dong-Jun Kwon; Ga-Young Gu; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries
Composites Part A-applied Science and Manufacturing | 2013
Zuo-Jia Wang; Dong-Jun Kwon; Ga-Young Gu; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries; Joung-Man Park
Composites Part B-engineering | 2016
Gyu-In Shim; Seong Hwan Kim; Deok-Lae Ahn; Jong-Kyoo Park; Doo-Han Jin; Dong-Teak Chung; Se-Young Choi
Composites Part B-engineering | 2012
Joung-Man Park; Zuo-Jia Wang; Dong-Jun Kwon; Ga-Young Gu; Woo-Il Lee; Jong-Kyoo Park; K. Lawrence DeVries