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Thomas, Siby,Jung, Hoejoong,Kim, Suyeon,Jun, Byeongsun,Lee, Chi Ho,Lee, Sang Uck Elsevier 2019 Carbon Vol.148 No.-
<P><B>Abstract</B></P> <P>There is great interest in finding suitable electrode materials for metal-ion batteries with good performance, low diffusion barriers and high capacity. Using the art of density functional theory (DFT), we systematically evaluated the possibility of planar carbon haeckelite structures (h567, r57, and o567) for a suitable anode in Lithium-ion batteries (LIBs). Our results show that haeckelites possess significant structural, mechanical, and electronic stability with high metallicity for LIB anode applications. Especially, the haeckelite h567 shows improved specific capacity (Li<SUB>1<I>.</I>875</SUB>C<SUB>6</SUB> ∼ 697 mAhg<SUP> <I>−</I>1</SUP>) compared to LiC<SUB>6</SUB> graphite due to the negative Li binding energy without clustering of Li atoms. In addition, it is worth noticing that the low open-circuit voltage (<0.30 V) and Li diffusion energy barrier (E<SUB> <I>a</I> </SUB> < 0.35 eV) of the haeckelite h567comparable to that of the graphite is beneficial to the overall performance of the LIBs. Based on the excellent electronic structure, superior Li mobility, extremely high in-plane stiffness, low open-circuit voltage, and high specific capacity, haeckelite h567 can be a promising anode material for the low-cost and high-performance LIBs.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jung, Wonil,Lee, Sujeong,Yoo, Dongwon,Jeong, Sohee,Miró,, Pere,Kuc, Agnieszka,Heine, Thomas,Cheon, Jinwoo American Chemical Society 2015 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.137 No.23
<P>The generation of single-layer 2-dimensional (2D) nanosheets has been challenging, especially in solution-phase, since it requires highly anisotropic growth processes that exclusively promote planar directionality during nanocrystal formation. In this study, we discovered that such selective growth pathways can be achieved by modulating the binding affinities of coordinating capping ligands to the edge facets of 2D layered transition-metal chalcogenides (TMCs). Upon changing the functional groups of the capping ligands from carboxylic acid to alcohol and amine with accordingly modulated binding affinities to the edges, the number of layers of nanosheets is controlled. Single-layer MSe<SUB>2</SUB> (M = Mo, W) TMC nanosheets are obtained with the use of oleic acid, while multilayer nanosheets are formed with relatively strong binding ligands such as oleyl alcohol and oleylamine. With the choice of appropriate capping ligands in the 2D anisotropic growth regime, our solution-based synthetic method can serve a new guideline for obtaining single-layer TMC nanosheets.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2015/jacsat.2015.137.issue-23/jacs.5b02772/production/images/medium/ja-2015-02772c_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja5b02772'>ACS Electronic Supporting Info</A></P>
Jung, Jae Woong,Liu, Feng,Russell, Thomas P.,Jo, Won Ho The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.76
<P>A new building block for low band-gap polymers, diketopyrrolopyrrole (DPP) flanked by pyridine (PyDPP), has been synthesized <I>via</I> a simple synthetic route. PyDPP was polymerized with bithiophene (BT) to afford a low band-gap copolymer (PBTPyDPP) which was used as an electron donor of the active layer in polymer solar cells. The solar cell device based on PBTPyDPP exhibited a promising PCE of 4.9% with a high <I>V</I><SUB>OC</SUB> over 0.9 V, which is one of the highest values among DPP-based polymer solar cells.</P> <P>Graphic Abstract</P><P>The low band-gap polymers based on diketopyrrolopyrrole flanked by pyridine exhibited a promising PCE of 4.9% with a high <I>V</I><SUB>OC</SUB> over 0.9 V, which is one of the highest values among DPP-based polymer solar cells. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc44676j'> </P>
Thoma, Daniel S.,Jung, Ui-Won,Gil, Alfonso,Kim, Myong Ji,Paeng, Kyeong-Won,Jung, Ronald E.,Fickl, Stefan Korean Academy of Periodontology 2019 Journal of Periodontal & Implant Science Vol.49 No.3
Purpose: To evaluate the effects of intra-alveolar socket grafting, subepithelial connective tissue grafts, and individualized abutments on peri-implant hard and soft tissue outcomes following immediate implant placement. Methods: This randomized experimental study employed 5 mongrel dogs, with 4 sites per dog (total of 20 sites). The mesial roots of P3 and P4 were extracted in each hemimandible and immediate dental implants were placed. Each site was randomly assigned to 1 of 4 different treatment groups: standardized healing abutment (control group), alloplastic bone substitute material (BSS) + standardized healing abutment (SA group), BSS + individualized healing abutment (IA group), and BSS + individualized healing abutment + a subepithelial connective tissue graft (IAG group). Clinical, histological, and profilometric analyses were performed. The intergroup differences were calculated using the Bonferroni test, setting statistical significance at P<0.05. Results: Clinically, the control and SA groups demonstrated a coronal shift in the buccal height of the mucosa ($0.88{\pm}0.48mm$ and $0.37{\pm}1.1mm$, respectively). The IA and IAG groups exhibited an apical shift of the mucosa ($-0.7{\pm}1.15mm$ and $-1.1{\pm}0.96mm$, respectively). Histologically, the SA and control groups demonstrated marginal mucosa heights of $4.1{\pm}0.28mm$ and $4.0{\pm}0.53mm$ relative to the implant shoulder, respectively. The IA and IAG groups, in contrast, only showed a height of 2.6mm. In addition, the height of the mucosa in relation to the most coronal buccal bone crest or bone substitute particles was not significantly different among the groups. Volumetrically, the IA group ($-0.73{\pm}0.46mm$) lost less volume on the buccal side than the control ($-0.93{\pm}0.44mm$), SA ($-0.97{\pm}0.73mm$), and IAG ($-0.88{\pm}0.45mm$) groups. Conclusions: The control group demonstrated the most favorable change of height of the margo mucosae and the largest dimensions of the peri-implant soft tissues. However, the addition of a bone substitute material and an individualized healing abutment resulted in slightly better preservation of the peri-implant soft tissue contour.
Jung, Jae Woong,Liu, Feng,Russell, Thomas P.,Jo, Won Ho The Royal Society of Chemistry 2013 Energy & environmental science Vol.6 No.11
<P>An effective approach to extend the light absorption range of conjugated polymers for high performance photovoltaics is synthesis of copolymers composed of at least two different chromophores with a complementary absorption range. For this purpose, we synthesized random conjugated copolymers consisting of DPP and isoindigo as co-electron accepting units in donor–acceptor type conjugated copolymers. The random copolymers exhibited both broad light absorption and low-lying HOMO level, which contribute to enhancement of <I>J</I><SUB>SC</SUB> and <I>V</I><SUB>OC</SUB>, respectively. Furthermore, the predominant face-on orientation of the random copolymers on the substrate is beneficial for charge transport in the device. The polymer solar cell (PSC) based on the random copolymer has shown a promising efficiency of 6.04% which is the highest value among PSCs based on random copolymers.</P> <P>Graphic Abstract</P><P>A semi-crystalline random copolymer which exhibits both broad light absorption and low-lying HOMO level shows a power conversion efficiency over 6%. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ee40689j'> </P>