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Jungdon Suk,Joohan Lee,곽주현 대한화학회 2004 Bulletin of the Korean Chemical Society Vol.25 No.11
Self-assembled systems with polyamidoamine (PAMAM) dendrimers combined with gold nanoparticles have been widely studied because of their potential applications in molecular electronics, catalyst carriers, chemical sensors, and biomedical devices. In our work, gold nanoparticle monolayers and multilayers with pure and ferrocene-tethered PAMAM dendrimers as cross-linking molecules were deposited on a mixed self-assembled monolayer of gold substrates. The various generations of PAMAM dendrimers can be covalently attached to mercaptoundecanoic acid mixed with a mercaptoundecanol self-assembled monolayer. Cyclic voltammograms show that redox peak currents on the alternate multilayers of gold nanoparticles and ferrocene-tethered PAMAM dendrimers increase as the number of layers increases. Fourier transform IR external reflection spectroscopy and scanning electron microscopy support the results from electrochemical measurements.
Bae, Jungdon,Kim, Suk Min,Lee, Sun Bok Springer 2015 Extremophiles Vol.19 No.2
<P>We identified the non-phosphorylated L-rhamnose metabolic pathway (Rha_NMP) genes that are homologous to those in the thermoacidophilic archaeon Thermoplasma acidophilum in the genome of the thermoacidophilic bacterium Sulfobacillus thermosulfidooxidans. However, unlike previously known 2-keto-3-deoxy-L-rhamnonate (L-KDR) dehydrogenase (KDRDH) which belongs to the short chain dehydrogenase/reductase superfamily, the putative KDRDHs in S. thermosulfidooxidans (Sulth_3557) and T. acidophilum (Ta0749) belong to the medium chain dehydrogenase/reductase (MDR) superfamily. We demonstrated that Sulth_3559 and Sulth_3557 proteins from S. thermosulfidooxidans function as L-rhamnose dehydrogenase and KDRDH, respectively. Sulth_3557 protein is an NAD(+)-specific KDRDH with optimal temperature and pH of 50 C and 9.5, respectively. The K m and V max values for L-KDR were 2.0 mM and 12.8 U/mg, respectively. Sulth_3557 also showed weak 2,3-butanediol dehydrogenase activity. Phylogenetic analysis suggests that Sulth_3557 and its homologs form a new subfamily in the MDR superfamily. The results shown in this study imply that thermoacidophilic archaea metabolize L-rhamnose to pyruvate and L-lactate by using the MDR-family KDRDH similarly to that of the thermoacidophilic bacterium S. thermosulfidooxidans.</P>
Kim, Sue Jin,Suk, Jungdon,Yun, Young Jun,Jung, Ha-Kyun,Choi, Sungho The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.5
<P>Porous and spherical Li<SUB>2</SUB>MnSiO<SUB>4</SUB> nanoparticles have been synthesized through a facile sol–gel route <I>via</I> a mesoporous silica template. Galvanostatic charge–discharge of the resultant Li<SUB>2</SUB>MnSiO<SUB>4</SUB> cathode exhibits enhanced charge–discharge capacity relative to that of particles prepared by the conventional sol–gel process, up to 25% in discharge capacity, even without any particulate process such as milling with conductive agents. The standout electrochemical performance could be attributed to the unique high surface-to-volume ratio, porous geometry and improved accommodation of transformation strains during the electrochemical lithiation–delithiation process.</P> <P>Graphic Abstract</P><P>A novel strategy to synthesize carbon-free cathode nanoparticles <I>via</I> a porous template. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp53436g'> </P>
Song, Min-Jung,Bae, Jungdon,Lee, Dae-Sil,Kim, Chang-Ho,Kim, Jun-Seok,Kim, Seung-Wook,Hong, Suk-In Elsevier 2006 Journal of bioscience and bioengineering Vol.101 No.2
<P>To date, prodigiosin and its analogues which have been shown to have anticancer, cytotoxic and immunosuppressive activities have been isolated from <I>Serratia, Pseudomonas</I> and <I>Streptomyces</I> species, and chemically synthesized. In a previous study, the red pigment content in <I>Serratia</I> sp. KH-95 was enhanced using a casein-enriched medium. Recently, an integrated bioreactor with an internal adsorbent has been developed to increase the production yield and allow easy recovery of the pigment. Thus, this study focused on both purifying and identifying a single red pigment from several pigments attached to the adsorbent in an integrated bioreactor. The red pigment was extracted directly from the internal adsorbent using acidified methanol and phase separation. Subsequently, it was purified by silica gel chromatography and high performance liquid chromatograph (HPLC). As a result, pure prodigiosin was identified by structural studies as a pigment. Also, this downstream procedure that uses the integrated bioreactor can be applied to the direct production and purification of other prodigiosin analogues and hydrophobic alkaloid compounds from several microorganisms.</P>
Nguyen, Tien Manh,Suk, Jungdon,Kang, Yongku The Korean Electrochemical Society 2019 Journal of electrochemical science and technology Vol.10 No.2
Poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) show promise for improving the lithium ion battery safety. However, due to oxidation of the PEO group and corrosion of the Al current collector, PEO-based SPEs have not previously been effective for use in $LiCoO_2$ (LCO) cathode materials at room temperature. In this paper, a semi-interpenetrating polymer network (semi-IPN) PEO-based SPE was applied to examine the performance of a LCO/SPE/Li metal cell at different voltage ranges. The results indicate that the SPE can be applied to LCO-based lithium polymer batteries with high electrochemical performance. By using a carbon-coated aluminum current collector, the Al corrosion was mostly suppressed during cycling, resulting in improvement of the cell cycle stability.
Kim, Jinmin,Kang, Yongku,Song, Seung-Wan,Suk, Jungdon Elsevier 2019 ELECTROCHIMICA ACTA Vol.299 No.-
<P><B>Abstract</B></P> <P>The structural design and synthesis of sulfur-carbon composite materials with high performance is still a major challenge for rechargeable lithium-sulfur batteries. Interconnected three-dimensional frameworks comprising multi-walled carbon nanotubes, graphene, or carbon particles offer a combination of constituent advantages and can thus be used to achieve superior energy conversion and storage properties. Herein, we designed and prepared free-standing three-dimensional sulfur papers containing interconnected highly conductive carbon materials, which enable to be flexible binder-free cathodes for Li-S batteries. The resultant sulfur-carbon composite paper cathode exhibited high reversible specific capacity of 1386 mAhg<SUP>−1</SUP>, good rate capability up to 5C, and excellent cycling performance (a capacity retention 68% after 400 cycles), all of which are significantly improved from those of bare sulfur cathode or sulfur-GO composite only. Rational design of cathode composition, structure, and a simple fabrication process can give insight into the development of various advanced cathode materials for high-performance Li-S batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The composition of in-situ formed sulfur particles on the surface of GO with conductive carbons was designed and prepared. </LI> <LI> Highly flexible and conductive S-GO/SP and S-GO/MWCNT papers were used the cathode for Li-S battery. </LI> <LI> The use of composite papers allowed high reversible capacity and stable cycling performance. </LI> <LI> The use of S-GO/MWCNT composite papers improved the rate capability. </LI> <LI> The interconnected 3D framework was able to suppress the migration of polysulfides and irreversible agglomeration/deposition. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>