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Lux308,, Minfeng,Jo, Hongil,Oh, Seung-Jin,Lee, Suheon,Choi, Kwang-Yong,Yu, Yang,Ok, Kang Min ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol.56 No.10
<P>Three new quaternary lithium metal tellurites, Li3MTe4O11 (M = Al, Ga, and Fe), have been synthesized through hydrothermal and solid-state reactions by heating a mixture of LiOH center dot H2O, TeO2, and M2O3. The structures of the title compounds have been determined by single-crystal and powder X-ray diffraction. Li3MTe4O11 reveal three-dimensional (3D) frameworks that consist of MO6 octahedra, TeO3 trigonal pyramids, and TeO4 polyhedra. The variable coordination mode of Te4+ within the framework leads to the formation of 1D channels that host Li+ cations on both tetrahedral and octahedral sites. The bulk and grain boundary Li+ ion conductivities for a Li3FeTe4O11 pellet in open air are estimated to be 1.0 x 10(-4) and 2.7 x 10(-6) S cm(-1), respectively, at room temperature from the impedance profile analysis. A lower activation energy of 19.9 kJ mol(-1) is obtained for the system, which is similar to that of Li10GeP2S12 (24 kJ mol(-1)). Detailed characterizations such as thermal, spectroscopic, and magnetic properties for the reported materials are also reported.</P>
Ming, Jun,Kwak, Wonx2010,Jin,Park, Jinx2010,Bum,Shin, Changx2010,Dae,Lu, Jun,Curtiss, Larry,Amine, Khalil,Sun, Yangx2010,Kook WILEY‐VCH Verlag 2014 CHEMPHYSCHEM -WEINHEIM- Vol.15 No.10
<P>A new physical pulverization strategy has been developed to prepare a highly active composite of CoOx and crushed graphite (CG) for the cathode in lithium-oxygen batteries. The effect of CoOx loading on the charge potential in the oxygen evolution reaction (Li2O2 -> 2Li(+) + O-2 + 2e(-)) was investigated in coin-cell tests. The CoOx (38.9 wt%)/CG composite showed a low charge potential of 3.92 V with a delivered capacity of 2 mAh cm(-2) under a current density of 0.2 mA cm(-2). The charge potential was 4.10 and 4.15 V at a capacity of 5 and 10 mAh cm(-2), respectively, with a current density of 0.5 mA cm(-2). The stability of the electrolyte and discharge product on the gas-diffusion layer after the cycling were preliminarily characterized by H-1 nuclear magnetic resonance spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The high activity of the composite was further analyzed by electrochemical impedance spectroscopy, cyclic voltammetry, and potential-step chronoamperometry. The results indicate that our near-dry milling method is an effective and green approach to preparing a nanocomposite cathode with high surface area and porosity, while using less solvent. Its relative simplicity compared with the traditional solution method could facilitate its widespread application in catalysis, energy storage, and materials science.</P>
Synthesis and Magnetic Properties of Hematite Particles in a “Nanomedusa” Morphology
Lee, Jin Bae,Kim, Hae Jin,Lux17e,nik, Janez,Jelen, Andreja,Pajix107,, Damir,Wencka, Magdalena,Jaglix10d,ix107,, Zvonko,Meden, Anton,Dolinx161,ek, Janez Hindawi Limited 2014 Journal of nanomaterials Vol.2014 No.-
<P>We present the synthesis, characterization, and magnetic properties of hematite particles in a peculiar “nanomedusa” morphology. The particles were prepared from an iron-silica complex by a hydrothermal process in a solution consisting of ethyl acetate and ethanol. The particles’ morphology, structure, and chemical composition were investigated by transmission electron microscopy, powder X-ray diffraction, and scanning electron microscope equipped with an energy-dispersive X-ray spectrometer. The “hairy” particles consist of a spherical-like core of about 100 nm diameter and fibrous exterior composed of thin “legs” of 5 nm diameter grown along one preferential direction. The particles’ cores are crystalline and undergo a magnetic phase transition to a weakly ferromagnetic state at a temperature of 930 K that matches reasonably the Néel temperature of bulk hematite. However, unlike bulk hematite that undergoes Morin transition to an antiferromagnetic state around room temperature and small hematite nanoparticles that are superparamagnetic, the “nanomedusa” particles remain weakly ferromagnetic down to the lowest investigated temperature of 2 K. Each particle thus represents a nanodimensional “hairy” ferromagnet in a very broad temperature interval, extending much above the room temperature. Such high-temperature ferromagnetic nanoparticles are not frequently found among the nanomaterials.</P>
Lu, Xiaoyan,Li, Xiao-Xi,Seo, Mi Sook,Lee, Yong-Min,Clex301,mancey, Martin,Maldivi, Pascale,Latour, Jean-Marc,Sarangi, Ritimukta,Fukuzumi, Shunichi,Nam, Wonwoo American Chemical Society 2019 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.141 No.1
<P>A mononuclear nonheme iron(IV)-amido complex bearing a tetraamido macrocyclic ligand, [(TAML)Fe<SUP>IV</SUP>(NHTs)]<SUP>−</SUP> (<B>1</B>), was synthesized via a hydrogen atom (H atom) abstraction reaction of an iron(V)-imido complex, [(TAML)Fe<SUP>V</SUP>(NTs)]<SUP>−</SUP> (<B>2</B>), and fully characterized using various spectroscopies. We then investigated (1) the p<I>K</I><SUB>a</SUB> of <B>1</B>, (2) the reaction of <B>1</B> with a carbon-centered radical, and (3) the H atom abstraction reaction of <B>1</B>. To the best of our knowledge, the present study reports for the first time the synthesis and chemical properties/reactions of a high-valent iron(IV)-amido complex.</P> [FIG OMISSION]</BR>
State of the Art of Carbon Nanotube Fibers: Opportunities and Challenges
Lu, Weibang,Zu, Mei,Byun, Joonx2010,Hyung,Kim, Byungx2010,Sun,Chou, Tsux2010,Wei WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.14
<P><B>Abstract</B></P><P>The superb mechanical and physical properties of individual carbon nanotubes (CNTs) have provided the impetus for researchers in developing high‐performance continuous fibers based upon CNTs. The reported high specific strength, specific stiffness and electrical conductivity of CNT fibers demonstrate the potential of their wide application in many fields. In this review paper, we assess the state of the art advances in CNT‐based continuous fibers in terms of their fabrication methods, characterization and modeling of mechanical and physical properties, and applications. The opportunities and challenges in CNT fiber research are also discussed.</P>
Lu, Li Ping,Finlayson, Chris E.,Kabra, Dinesh,Albertx2010,Seifried, Sebastian,Song, Myoung Hoon,Havenith, Remco W. A.,Tu, Guoli,Huck, Wilhelm T. S.,Friend, Richard H. WILEY‐VCH Verlag 2013 Macromolecular chemistry and physics Vol.214 No.9
<P><B>Abstract</B></P><P>A study of the organic semiconductor F8TBT is presented, directly comparing a conventional form (F8TBT‐out) with a form with varied alkyl side‐chain position (F8TBT‐in), in terms of optical properties and device performance in light‐emitting‐diodes (LEDs). Computational simulations of the side‐chain position with respect to the TBT unit reveal geometrical differences between F8TBT‐out and F8TBT‐in. π–π conjugation on the backbone of F8TBT‐in is interrupted by a distortion of the benzothiadiazole ring, leading to a blue‐shift of the absorption spectrum and increased photoluminescence quantum efficiency. Both conventional and hybrid LEDs demonstrate that devices with F8TBT‐in show improved performance, as compared to F8TBT‐out, illustrating how tuning the optoelectronic properties of conjugated polymers by varying the placement of side chains has an important role in device optimization.</P>
Nanomechanics of Cation–π Interactions in Aqueous Solution
Lu, Qingye,Oh, Dongyeop X.,Lee, Youngjin,Jho, Yongseok,Hwang, Dong Soo,Zeng, Hongbo WILEY‐VCH Verlag 2013 Angewandte Chemie Vol.125 No.14
<P><B>Eine erste direkte Untersuchung</B> der Nanomechanik von Kation‐π‐Wechselwirkungen in wässrigem Medium wurde mit einem Oberflächenkraftmessgerät durchgeführt und durch theoretische Simulationen ergänzt. Das Tetraethylammonium‐Ion (TEA) verhindert die Adhäsion von Polytryptophan (PTrp) und Poly‐<SMALL>L</SMALL>‐lysin (PLL) mit einer 100‐fach höheren Empfindlichkeit als das K<SUP>+</SUP>‐Ion (PS=Polystyrol, PTyr=Poly‐<SMALL>L</SMALL>‐tyrosin, ACh=Acetylcholin).</P>
Label‐Free Polypeptide‐Based Enzyme Detection Using a Graphene‐Nanoparticle Hybrid Sensor
Myung, Sung,Yin, Perry T.,Kim, Cheoljin,Park, Jaesung,Solanki, Aniruddh,Reyes, Pavel Ivanoff,Lu, Yicheng,Kim, Kwang S.,Lee, Kix2010,Bum WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.45
<P><B>A graphene‐nanoparticle (NP) hybrid biosensor</B> that utilizes an electrical hysteresis change to detect the enzymatic activity and concentration of Carboxypeptidase B was developed. The results indicate that the novel graphene‐NP hybrid biosensor, utilizing electrical hysteresis, has the ability to detect concentrations of targeted enzyme on the micromolar scale. Furthermore, to the knowledge of the authors, this is the first demonstration of a graphene‐based biosensor that utilizes a hysteresis change resulting from metallic NPs assembled on a graphene surface.</P>
Lu, Xiaoqing,Kazmierczak, Katarzyna,Jiang, Xiaoyu,Jones, Michelle,Watt, James,Helfman, David M.,Moore, Jeffrey R.,Szczesnax2010,Cordary, Danuta,Lossos, Izidore S. Blackwell Publishing Ltd 2011 The FEBS journal Vol.278 No.11
<P>Human germinal center associated lymphoma (HGAL) is a germinal center‐specific gene whose expression correlates with a favorable prognosis in patients with diffuse large B‐cell and classic Hodgkin lymphomas. HGAL is involved in negative regulation of lymphocyte motility. The movement of lymphocytes is directly driven by actin polymerization and actin–myosin interactions. We demonstrate that HGAL interacts directly and independently with both actin and myosin and delineate the HGAL and myosin domains responsible for the interaction. Furthermore, we show that HGAL increases the binding of myosin to F‐actin and inhibits the ability of myosin to translocate actin by reducing the maximal velocity of myosin head/actin movement. No effects of HGAL on actomyosin ATPase activity and the rate of actin polymerization from G‐actin to F‐actin were observed. These findings reveal a new mechanism underlying the inhibitory effects of germinal center‐specific HGAL protein on lymphocyte and lymphoma cell motility.</P>
THE SCALING RELATIONS AND STAR FORMATION LAWS OF MINI-STARBURST COMPLEXES
Nguyex302,x303,n-Lu’o, Quang,Nguyex302,x303,n, Hans V. V.,Motte, Fredé,rique,Schneider, Nicola,Fujii, Michiko,Louvet, Fabien,Hill, Tracey,Sanhueza, Patricio,Chibueze, James O.,Didelon, P American Astronomical Society 2016 The Astrophysical journal Vol.833 No.1
<P>The scaling relations and star formation laws for molecular cloud complexes (MCCs) in the Milky Way are investigated. MCCs are mostly large (R> 50 pc), massive (similar to 106 M circle dot) gravitationally unbound cloud structures. We compare their masses M-gas, mass surface densities Sigma(Mgas), radii R, velocity dispersions sigma, star formation rates (SFRs), and SFR densities Sigma(SFR) with those of structures ranging from cores, clumps, and giant molecular clouds, to MCCs, and galaxies, spanning eight orders of magnitudes in size and 13 orders of magnitudes in mass. This results in the following universal relations: sigma similar to R-0.5, M-gas similar to R-2, Sigma(SFR) similar to Sigma(1.5)(Mgas) , SFR similar to M-gas(0.9) , and SFR similar to sigma(2.7) Variations in the slopes and coefficients of these relations are found at individual scales, signifying different physics acting at different scales. Additionally, there are breaks at the MCC scale in the sigma-R relation and between starburst and normal star-forming objects in the SFR-M-gas and Sigma(SFR)-Sigma(Mgas) gas relations. Therefore, we propose to use the Schmidt-Kennicutt diagram to distinguish starburst from normal star-forming structures by applying a SMgas threshold of similar to 100M circle dot pc (2) and a Sigma(SFR) threshold of 1M circle dot yr (1) kpc (2). Mini-starburst complexes are gravitationally unbound MCCs that have enhanced Sigma(SFR) (> 1M circle dot yr(-1) kpc(-2)), probably caused by dynamic events such as radiation pressure, colliding flows, or spiral arm gravitational instability. Because of dynamical evolution, gravitational boundedness does not play a significant role in regulating the star formation activity of MCCs, especially the mini-starburst complexes, which leads to the dynamical formation of massive stars and clusters. We emphasize the importance of understanding mini-starbursts in investigating the physics of starburst galaxies.</P>