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Plasma-sprayed gadolinium-doped ceria (GDC) for intermediate temperature solid electrolyte
Chanjin Son,Aman Bhardwaj,Jaewoon Hong,Jin-Wook Kim,Heung-Soo Moon,Hyo-Seop Noh,Sun-Ju Song 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.12
10 mol% gadolinium-doped cerium (IV) oxide was prepared by solid-state reaction route and deposited as a thick film usingthermal (plasma) spray technique. The phase development, microstructure and topography were characterized by X-raydiffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The mechanical strength of thedeposited film was determined by pull-off adhesion test. The plasma-sprayed GDC was characterized for its electricalproperties by dc four-probe conductivity experiments. The maximum conductivity for plasma-sprayed GDC was found to be3.60 × 10−2 Scm−1, which was lesser than 2.25 × 10−1 Scm−1for the CIP-sintered GDC at 1000 oC and pO2= 0.21 atm. Thedecrease in the conductivity is attributed to the larger intergranular spaces and uneven networking observed in themicrostructure resulted in higher activation energy and low conductivity.
Balamurugan, C.,Son, Chanjin,Hong, Jaewoon,Song, Sun-Ju Elsevier 2018 Sensors and actuators. B Chemical Vol.262 No.-
<P><B>Abstract</B></P> <P>We have designed the solid-state electrochemical mixed potential type NiO and yttrium-stabilized zirconia (YSZ) composite based sensing electrode for selective detection of NO<SUB>x</SUB> at elevated temperatures. The planner NiO-YSZ composite sensing electrode could detect NO<SUB>x</SUB> even at 400 °C, with acceptable response/recovery rates. The change in emf values of the sensor varied linearly with NO<SUB>x</SUB> concentrations on a logarithmic scale in the range of 5–100 ppm. The response characteristic of the sensor was improved by modifying the surface with different vol% of pore former. As a result, obtained porous electrodes showed better response characteristics concerning speed and response owing to higher porosity. To improve response kinetics of porous NiO-YSZ electrode, NiO nanoparticles are infiltrated into an optimized NiO-YSZ sensing electrode surface by controlled urea/cation infiltration method. The experimental results demonstrated that NiO nanoparticles infiltrated NiO-YSZ sensor electrode reveal remarkably high emf response to NO<SUB>x</SUB> compared that of planar electrode, suggesting that NiO nanoparticles introduction can significantly enhance catalytic activity and electrochemical performance of NiO-YSZ electrode. Finally, the porosity effect of electrode subtracts (YSZ) with NO<SUB>x</SUB> gases response and recovery kinetics was examined under the optimum operating temperature at 400 °C. The sensing mechanism based on the mixed potential for the surface modified NiO-YSZ composite sensing electrode was discussed based on the obtained result of sensing characterizations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The detailed NO<SUB>x</SUB> gas sensing characteristics of NiO-YSZ based three different types of mixed potential sensing electrodes for the comparatively low operating temperature of 400 °C. </LI> <LI> Optimized NiO-YSZ electrode surface was modified by the addition of different vol% of pore former, it showed better response characteristics concerning speed and response. </LI> <LI> The NiO nanoparticles infiltrated NiO-YSZ sensing electrode shows a remarkably high emf variation to 100 ppm NO<SUB>x</SUB>, and it can detect a level as low as 3 ppm. </LI> <LI> The porosity effect of electrode subtracts (YSZ) with NO<SUB>x</SUB> gases response and recovery kinetics was also examined under the optimum operating temperature at 400 °C. </LI> </UL> </P>
Modified Chitosan Scaffold for Tissue Engineering
( Myungchul Lee ),( Kyoung-je Jang ),( Sang Bae Park ),( Jaewoon Lim ),( Hyun-mok Son ),( Jae Eun Kim ),( Jong Hoon Chung ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
Damage to the eardrum causes acute pain and can lead to chronic otitis media if it develops into chronic tympanic membrane (TM) perforations. The chronic TM perforations are usually treated with surgical methods such as tympanoplasty and myringoplasty. However, the surgeries are not only complicated and difficult but also cost a lot of money. Our research team developed chitosan patches (E-CPs) that release epidermal growth factor (EGF) as a patch therapy to replace surgical methods. However, there was a limitation in the healing ratio of the treatment compared to the surgical methods. In this study, we developed an EGF and epidermal growth factor receptor (EGFR) gene-releasing polyethyleneimine (PEI)/chitosan patches (EErP-CPs) to increase the regeneration of TM perforations. The addition of PEI increased the adhesion and migration ability of TM cells on the patches. The simultaneous release of the EGF and EGFR gene further enhanced TM cell proliferation, adhesion and migratory ability. It was confirmed that the EGF protein and EGFR gene were released for 30 days, however EGF was released and increased TM cell viability almost immediately after treatment and EGFR took minimum of 3 days before showing its effect on improved cell viability. It was also shown that EErP-CPs are more hydrophilic and have more positive charge than E-CP because of added amine groups from PEI. In conclusion, the developed EErP-CPs resulted in improved healing of TM perforations and can potentially be applied to the regeneration of both chronic and acute tympanic membrane perforations.
Delivery of Anticancer Drug Using Electrospray System
( Myungchul Lee ),( Kyoung-je Jang ),( Sang Bae Park ),( Jaewoon Lim ),( Hyun-mok Son ),( Jae Eun Kim ),( Jong Hoon Chung ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.2
Cisplatin, a representative anti-cancer drug used to treat cancer, has many side effects. In particular, it causes great damage to the kidneys. Thus, many researcher have studied to deliver a drug with side effect such as cisplatin to cancer area using targeted drug delivery system. Here we propose a novel way to deliver drugs directly to the tumor site. That is another application of electrospray methods. We discovered optimal conditions to promote the introduction of cisplatin into cancer cells. The group of electrospray with cisplatin at 8 kV led to the necrosis of cells about 1.5 times more likely than the group of treated cisplatin alone. Thus, we propose a new way to treat cancer by delivering anticancer drug directly to the tumor site using this electrospray technique.
Establishment of the 2nd National Reference Standard for Diphtheria toxin in Korea
So Young Kim,Jinwoong Lee,Sol Jeon,Su Jung An,In yeong Hwang,Jae Hoon Moon,Jong Kwan Park,Taeseung Yang,Jaewoon Son,Daegeun Kim,Jeongwon Jang,Seulgi Park,Eun Ah Choi,Jin Kyu Kim,Jin Tae Hong,Jong Won 대한미생물학회 2021 Journal of Bacteriology and Virology Vol.51 No.1