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Koó,s, Antal A.,Vancsó,, Pé,ter,Magda, Gá,bor Z.,Osvá,th, Zoltá,n,Kerté,sz, Krisztiá,n,Dobrik, Gergely,Hwang, Chanyong,Tapasztó,, Levente,Bir&oacu Elsevier 2016 Carbon Vol.105 No.-
<P>Heterostructures of 2D materials are expected to become building blocks of next generation nanoelectronic devices. Therefore, the detailed understanding of their interfaces is of particular importance. In order to gain information on the properties of the graphene - MoS2 system, we have investigated MoS2 sheets grown by chemical vapour deposition (CVD) on highly ordered pyrolytic graphite (HOPG) as a model system with atomically clean interface. The results are compared with results reported recently for MoS2 grown on epitaxial graphene on SiC. Our STM study revealed that the crystallographic orientation of MoS2 sheets is determined by the orientation of the underlying graphite lattice. This epitaxial orientation preference is so strong that the MoS2 flakes could be moved on HOPG with the STM tip over large distances without rotation. The electronic properties of the MoS2 flakes have been investigated using tunneling spectroscopy. A significant modification of the electronic structure has been revealed at flake edges and grain boundaries. These features are expected to have an important influence on the performance of nanoelectronic devices. We have also demonstrated the ability of the STM to define MoS2 nanoribbons down to 12 nm width, which can be used as building blocks for future nanoelectronic devices. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Nemestó,thy, Ná,ndor,Bakonyi, Pé,ter,Ró,zsenberszki, Tamá,s,Kumar, Gopalakrishnan,Koó,k, Lá,szló,Kelemen, Gá,bor,Kim, Sang-Hyoun,Bé,lafi-Bak Elsevier 2018 International journal of hydrogen energy Vol.43 No.41
<P><B>Abstract</B></P> <P>Lignocellulosic biofuel, in particular hydrogen gas production is governed by successful feedstock pretreatment, hydrolysis and fermentation. In these days, remarkable attention is paid to the use of ionic liquids to make the fermentable regions of lignocellulose biomass more accessible to the biocatalysts. Although these compounds have great potential for this purpose, their presence during the consecutive fermentation stage may pose a threat on process stability due to certain toxic effects. This, however, has not been specifically elaborated for dark fermentative biohydrogen generation. Hence, in this work, two common imidazolium-type ionic liquids (1-butyl-3-methylimidazolium acetate, ([bmim][Ac]) and 1-butyl-3-methylimidazolium chloride, ([bmim][Cl])) were employed in mixed culture biohydrogen fermentation to investigate the possible impacts related to their presence and concentrations. The batch assays were evaluated comparatively via the modified Gompertz-model based on the important parameters characterizing the process, namely the biohydrogen production potential, maximum biohydrogen production rate and lag-phase time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The impact of imidazolium-type ionic liquids on biohydrogen formation was tested. </LI> <LI> The batch biohydrogen production process was evaluated kinetically. </LI> <LI> Both [bmim][Ac] and [bmim][Cl] affected the biohydrogen formation performance. </LI> <LI> The anion part of ionic liquids ([Ac]<SUP>-</SUP> vs. [Cl]<SUP>-</SUP>) demonstrated notable effect. </LI> </UL> </P>
Bakonyi, Pé,ter,Koó,k, Lá,szló,Kumar, Gopalakrishnan,Tó,th, Gá,bor,Ró,zsenberszki, Tamá,s,Nguyen, Dinh Duc,Chang, Soon Woong,Zhen, Guangyin,Bé,laf Elsevier 2018 Journal of membrane science Vol.564 No.-
<P><B>Abstract</B></P> <P>Significant advances in the design of bioelectrochemical systems (BES) have promoted these applications to be seen as contemporary biotechnological platforms. However, notable issues in system architecture are still to be addressed and overcome, in particular concerning the membrane separators, which rely widely on polymers. These architectural components play a key-role in facilitating the transport of ions (i.e. protons) between the (compartments containing the) electrodes and therefore, their properties substantially influence the overall BES performance. This article aims presenting an up-to-date survey on the important accomplishments and promising outlooks with polymer-based membranes (both porous/non-porous, charged/uncharged) applied in BES (first and foremost microbial fuel cells, MFCs) that could drive this technology towards enhanced efficiency. Because of the interdisciplinary concept of BES, it attracts attention from scientists and engineers involved in environmental biotechnology, microbial electrochemistry and applied material sciences and as a result, this review paper would target the audience of these fields with particular interest on the progress with membrane separators fabricated with various polymeric materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Critical membrane separator properties in BES are assessed. </LI> <LI> Techniques for membrane/separator characterization are outlined. </LI> <LI> Various polymer-based membranes/separators used in BES are discussed. </LI> <LI> Status and challenges for membrane development in BES are evaluated. </LI> </UL> </P>
Hong, Jung-Taek,Lee, Byoung Wan,Ko, Jae-Hyeon,Jankowska-Sumara, Irena,Podgó,rna, Maria,Majchrowski, Andrzej ELSEVIER 2018 Current Applied Physics Vol.18 No.6
<P><B>Abstract</B></P> <P>The phase transition sequence of a PbHf<SUB>0.7</SUB>Sn<SUB>0.3</SUB>O<SUB>3</SUB> single crystal was investigated by using Brillouin spectroscopy. The longitudinal acoustic mode showed three distinct changes at ∼370 K, ∼455 K and ∼495 K which corresponded to the antiferroelectric 1 → antiferroelectric 2 → intermediate → paraelectric phase transitions upon heating. The paraelectric phase was characterized by softening acoustic mode, increasing acoustic damping and the appearance of quasielastic central peaks which were observed upon approaching the phase transition temperature. The relaxation times derived from the acoustic mode anomalies and the central peak were consistent with each other and showed a slowing-down behavior. These precursor phenomena were attributed to the polar clusters having broken inversion symmetry. The substitution of Hf with Sn induced a very soft intermediate phase between the paraelectric and the antiferroelectric phases, where the longitudinal acoustic mode exhibited the lowest mode frequency along with substantially high acoustic damping. The transverse acoustic mode, which was observed in the two antiferroelectric phases, did not appear in the intermediate phase. These results indicated that the average symmetry of the intermediate phase may be cubic consisting of fine ferroelastic domains.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We measure the elastic properties of PbHf<SUB>0.7</SUB>Sn<SUB>0.3</SUB>O<SUB>3</SUB> single crystals. </LI> <LI> The acoustic anomalies related the phase transition are determined. </LI> <LI> The effect of Sn substitution on the elastic property is determined. </LI> </UL> </P>
Kobayashi, T.,Ida, K.,Inagaki, S.,Tsuchiya, H.,Tamura, N.,Choe, G.H.,Yun, G.S.,Park, H.K.,Ko, W.H.,Evans, T.E.,Austin, M.E.,Shafer, M.W.,Ono, M.,Ló,pez-bruna, D.,Ochando, M.A.,Estrada, T.,Hidalg IOP 2017 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.57 No.7
<P>In this contribution we analyze modulation electron cyclotron resonance heating (MECH) experiment and discuss higher harmonic frequency dependence of transport coefficients. We use the bidirectional heat pulse propagation method, in which both inward propagating heat pulse and outward propagating heat pulse are analyzed at a radial range, in order to distinguish frequency dependence of transport coefficients due to hysteresis from that due to other reasons, such as radially dependent transport coefficients, a finite damping term, or boundary effects. The method is applied to MECH experiments performed in various helical and tokamak devices, i.e. Large Helical Device (LHD), TJ-II, Korea Superconducting Tokamak Advanced Research (KSTAR), and Doublet III-D (DIII-D) with different plasma conditions. The frequency dependence of transport coefficients are clearly observed, showing a possibility of existence of transport hysteresis in flux-gradient relation.</P>