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“The study of carbon nanotubules produced by catalytic method”. Ivanov V, Nagy JB, Lambin P, Lucas A, Zhang XB, Zhang XF, Bernaerts D, Van Tendeloo G, Amelinckx S, van Landuyt J, Chemical physics letters 223, 329 (1994). http://doi.org/10.1016/0009-2614(94)00467-6
Abstract: Catalytic methods for the production of carbon nanotubules have been developed based on the decomposition of acetylene on well-dispersed metal particles strongly adsorbed on a support. Cobalt on silica was found to be the best catalyst-support combination for the production of graphitic tubules. The method for the catalyst preparation and the reaction conditions were optimized. Straight and coiled carbon tubules were obtained with inner and outer diameter of 3-7 and 15-20 nm, respectively, and up to 30 mum in length. These nanotubules were not coated by amorphous carbon. Traces of amorphous carbon could be removed by hydrogen. High resolution electron microscopy images and electron diffraction patterns of the straight nanotubules were similar to those obtained by the arc-discharge method. Coiled nanotubules were revealed by TEM to be regular polygonized helices where the bends are caused by pairs of pentagon-heptagon carbon rings among the hexagonal network.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.897
Times cited: 405
DOI: 10.1016/0009-2614(94)00467-6
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““Harmless&rdquo, carbon tubes around “dangerous&rdquo, asbestos fibres”. Zhang XF, Zhang XB, Van Tendeloo G, Meijer G, Carbon 32, 363 (1994). http://doi.org/10.1016/0008-6223(94)90206-2
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 6.196
Times cited: 2
DOI: 10.1016/0008-6223(94)90206-2
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Li Y, Zhang XB, Tao XY, Xu JM, Chen F, Shen LH, Yang XF, Liu F, Van Tendeloo G, Geise HJ (2005) Single phase MgMoO4 as catalyst for the synthesis of bundled multi-wall carbon nanotubes by CVD. Oxford, 1325–1328
Keywords: L1 Letter to the editor; Electron microscopy for materials research (EMAT)
Impact Factor: 6.337
Times cited: 23
DOI: 10.1016/j.carbon.2004.12.022
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“Synthesis of multi-branched porous carbon nanofibers and their application in electrochemical double-layer capacitors”. Tao XY, Zhang XB, Zhang L, Cheng JP, Liu F, Luo JH, Luo ZQ, Geise HJ, Carbon 44, 1425 (2006). http://doi.org/10.1016/j.carbon.2005.11.024
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 6.337
Times cited: 77
DOI: 10.1016/j.carbon.2005.11.024
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“Catalyst preparation with plasmas : how does it work?”.Wang Z, Zhang Y, Neyts EC, Cao X, Zhang X, Jang BW-L, Liu C-jun, ACS catalysis 8, 2093 (2018). http://doi.org/10.1021/ACSCATAL.7B03723
Abstract: Catalyst preparation with plasmas is increasingly attracting interest. A plasma is a partially ionized gas, consisting of electrons, ions, molecules, radicals, photons, and excited species, which are all active species for catalyst preparation and treatment. Under the influence of plasma, nucleation and crystal growth in catalyst preparation can be very different from those in the conventional thermal approach. Some thermodynamically unfavorable reactions can easily take place with plasmas. Compounds such as sulfides, nitrides, and phosphides that are produced under harsh conditions can be synthesized by plasma under mild conditions. Plasmas can produce catalysts with smaller particle sizes and controllable structure. Plasma is also a facile tool for reduction, oxidation, doping, etching, coating, alloy formation, surface treatment, and surface cleaning in a simple and direct way. A rapid and convenient plasma template removal has thus been established for zeolite synthesis. It can operate at room temperature and allows the catalyst preparation on temperature-sensitive supporting materials. Plasma is typically effective for the production of various catalysts on metallic substrates. In addition, plasma-prepared transition-metal catalysts show enhanced low-temperature activity with improved stability. This provides a useful model catalyst for further improvement of industrial catalysts. In this review, we aim to summarize the recent advances in catalyst preparation with plasmas. The present understanding of plasma-based catalyst preparation is discussed. The challenges and future development are addressed.
Keywords: A1 Journal article; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
Impact Factor: 10.614
Times cited: 81
DOI: 10.1021/ACSCATAL.7B03723
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“Plasma-catalytic methanol synthesis from CO₂, hydrogenation over a supported Cu cluster catalyst : insights into the reaction mechanism”. Cui Z, Meng S, Yi Y, Jafarzadeh A, Li S, Neyts EC, Hao Y, Li L, Zhang X, Wang X, Bogaerts A, Acs Catalysis 12, 1326 (2022). http://doi.org/10.1021/ACSCATAL.1C04678
Abstract: Plasma-catalytic CO, hydrogenation for methanol production is gaining increasing interest, but our understanding of its reaction mechanism remains primitive. We present a combined experimental/computational study on plasma-catalytic CO, hydrogenation to CH3OH over a size-selected Cu/gamma-Al2O3 catalyst. Our experiments demonstrate a synergistic effect between the Cu/gamma-Al2O3 catalyst and the CO2/H-2 plasma, achieving a CO2 conversion of 10% at 4 wt % Cu loading and a CH3OH selectivity near 50% further rising to 65% with H2O addition (for a H2O/CO2 ratio of 1). Furthermore, the energy consumption for CH3OH production was more than 20 times lower than with plasma only. We carried out density functional theory calculations over a Cu-13/gamma-Al2O3 model, which reveal that the interfacial sites of the Cu-13 cluster and gamma-Al2O3 support show a bifunctional effect: they not only activate the CO2 molecules but also strongly adsorb key intermediates to promote their hydrogenation further. Reactive plasma species can regulate the catalyst surface reactions via the Eley-Rideal (E-R) mechanism, which accelerates the hydrogenation process and promotes the generation of the key intermediates. H2O can promote the CH3OH desorption by competitive adsorption over the Cu-13/gamma-Al2O3 surface. This study provides new insights into CO2 hydrogenation through plasma catalysis, and it provides inspiration for the conversion of some other small molecules (CH4, N-2, CO, etc.) by plasma catalysis using supported-metal clusters.
Keywords: A1 Journal article; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
Impact Factor: 12.9
DOI: 10.1021/ACSCATAL.1C04678
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“Catalyst traces after chemical purification in CVD grown carbon nanotubes”. Biró, LP, Khanh NQ, Horváth ZE, Vértesy Z, Kocsonya A, Konya Z, Osváth Z, Koós A, Guylai J, Zhang XB, Van Tendeloo G, Fonseca A, Nagy JB, , 183 (2001)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Natural mineral-marine manganese nodule as a novel catalyst for the synthesis of carbon nanotubes”. Cheng JP, Zhang XB, Ye Y, Tao XY, Liu F, Li Y, Van Tendeloo G, Journal of Wuhan University of Technology: materials science edition 21, 29 (2006)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
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“Optimization of Automated Crystal Orientation and Phase Mapping in TEM Applied to Ni-Ti All Round Shape Memory Alloy”. Yao X, Li Y, Cao S, Ma X, Zhang X-ping, Schryvers D, MATEC web of conferences
T2 –, Proceedings of ESOMAT 2015 10th European Symposium on Martensitic Transformations, September 14-18, 2015, Antwerp, Belgium 33, 03022 (2015). http://doi.org/10.1051/matecconf/20153303022
Abstract: A new application which focuses on an artificial sphincter fabricated by Ni-Ti SMAs for human implantation is under investigation by applying the all-round shape memory effect with precise control of the phase transformation temperatures. In this study, a Ni51at.%-Ti alloy was fabricated by arc melting with fast solidification, followed by a proper strained aging which induces the two way shape memory effect needed for this particular application. Differential scanning calorimetry was used to investigate the thermal behavior and transmission electron microscopy was used for studying the microstructure of the alloys. With the latter the novel technique of automated crystal orientation microscopy is used and optimized to obtain phase and orientation mapping of the various structures.
Keywords: P1 Proceeding; Electron microscopy for materials research (EMAT)
Times cited: 1
DOI: 10.1051/matecconf/20153303022
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“Microstructural Characterization and Transformation Behavior of Porous Ni50.8Ti49.2”. Yao X, Cao S, Zhang XP, Schryvers D, Materials Today: Proceedings 2, S833 (2015). http://doi.org/10.1016/j.matpr.2015.07.411
Abstract: Porous Ni50.8Ti49.2 bulk material was prepared by powder metallurgy sintering. Solid solution and aging treatments were applied to improve the phase homogeneity and phase transformation behavior. Scanning and transmission electron microscopy, aided by energy dispersive X-ray analysis, were used to study the microstructure and chemical phase content of the alloys. In-situ cooling was carried out to observe the phase transformation behavior. As-received material contains dispersed Ni2Ti4O particles while Ni4Ti3 precipitates appear after aging. Close to pore edges, the latter have a preferential orientation due to the induced stress fields in the matrix.
Keywords: P1 Proceeding; Electron microscopy for materials research (EMAT)
DOI: 10.1016/j.matpr.2015.07.411
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“Superconductor-insulator transition driven by pressure-tuned intergrain coupling in nanodiamond films”. Zhang G, Zhou Y, Korneychuk S, Samuely T, Liu L, May PW, Xu Z, Onufriienko O, Zhang X, Verbeeck J, Samuely P, Moshchalkov VV, Yang Z, Rubahn H-G, Physical review materials 3, 034801 (2019). http://doi.org/10.1103/PHYSREVMATERIALS.3.034801
Abstract: We report on the pressure-driven superconductor-insulator transition in heavily boron-doped nanodiamond films. By systematically increasing the pressure, we suppress the Josephson coupling between the superconducting nanodiamond grains. The diminished intergrain coupling gives rise to an overall insulating state in the films, which is interpreted in the framework of a parallel-series circuit model to be the result of bosonic insulators with preserved localized intragrain superconducting order parameters. Our investigation opens up perspectives for the application of high pressure in research on quantum confinement and coherence. Our data unveil the percolative nature of the electrical transport in nanodiamond films, and highlight the essential role of grain boundaries in determining the electronic properties of this material.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.926
Times cited: 5
DOI: 10.1103/PHYSREVMATERIALS.3.034801
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“SF₆, degradation in γ-Al₂O₃, packed DBD system : effects of hydration, reactive gases and plasma-induced surface charges”. Cui Z, Zhou C, Jafarzadeh A, Zhang X, Hao Y, Li L, Bogaerts A, Plasma chemistry and plasma processing 43, 635 (2023). http://doi.org/10.1007/S11090-023-10320-3
Abstract: Packed-bed DBD (PB-DBD) plasmas hold promise for effective degradation of greenhouse gases like SF6. In this work, we conducted a combined experimental and theoretical study to investigate the effect of the packing surface structure and the plasma surface discharge on the SF6 degradation in a gamma-Al2O3 packing DBD system. Experimental results show that both the hydration effect of the surface (upon moisture) and the presence of excessive reactive gases in the plasma can significantly reduce the SF6 degradation, but they hardly change the discharge behavior. DFT results show that the pre-adsorption of species such as H, OH, H2O and O-2 can occupy the active sites (Al-III site) which negatively impacts the SF6 adsorption. H2O molecules pre-adsorbed at neighboring sites can promote the activation of SF6 molecules and lower the reaction barrier for the S-F bond-breaking process. Surface-induced charges and local external electric fields caused by the plasma can both improve the SF6 adsorption and enhance the elongation of the S-F bonds. Our results indicate that both the surface structure of the packing material and the plasma surface discharge are crucial for SF6 degradation performance, and the packing beads should be kept dry during the degradation. This work helps to understand the underlying mechanisms of SF6 degradation in a PB-DBD system.
Keywords: A1 Journal article; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
Impact Factor: 3.6
DOI: 10.1007/S11090-023-10320-3
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“Crystallography of fullerites and related graphene textures”. van Landuyt J, Van Tendeloo G, Amelinckx S, Zhang XF, Zhang XB, Luyten W, Materials science forum 150/151, 53 (1994)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
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“Electron microscopy study of coiled carbon tubules”. Bernaerts D, Zhang XB, Zhang XF, Amelinckx S, Van Tendeloo G, van Landuyt J, Ivanov V, Nagy JB, Philosophical magazine: A: physics of condensed matter: defects and mechanical properties 71, 605 (1995). http://doi.org/10.1080/01418619508244470
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 72
DOI: 10.1080/01418619508244470
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“HREM study of Rb6C60 and helical shaped carbon nanotubules”. Bernaerts D, Zhang X, Zhang X, Van Tendeloo G, Vanlanduyt J, Amelinckx S, Sciences , 305 (1994)
Keywords: P1 Proceeding; Electron microscopy for materials research (EMAT)
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“HREM study of Rb6C60 and helical carbon nanotubules”. Bernaerts D, Zhang XB, Zhang XF, Van Tendeloo G, van Landuyt J, Amelinckx S, Icem 13, 305 (1994)
Keywords: A3 Journal article; Electron microscopy for materials research (EMAT)
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“Structural aspects of carbon nanotubes”. Bernaerts D, Amelinckx S, Zhang XB, Van Tendeloo G, van Landuyt J, , 551 (1995)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Structural evolution of Bi2Sr2CaCu2O8+\delta single crystals studies by “in situ&rdquo, heating electron microscopy”. Zhang XF, Van Tendeloo G, Philosophical magazine: A: physics of condensed matter: defects and mechanical properties 70, 549 (1994)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 5
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“SF₆, catalytic degradation in a γ-Al₂O₃, packed bed plasma system : a combined experimental and theoretical study”. Cui Z, Zhou C, Jafarzadeh A, Meng S, Yi Y, Wang Y, Zhang X, Hao Y, Li L, Bogaerts A, High voltage , 1 (2022). http://doi.org/10.1049/HVE2.12230
Abstract: Effective abatement of the greenhouse gas sulphur hexafluoride (SF6) waste is of great importance for the environment protection. This work investigates the size effect and the surface properties of gamma-Al2O3 pellets on SF6 degradation in a packed bed dielectric barrier discharge (PB-DBD) system. Experimental results show that decreasing the packing size improves the filamentary discharges and promotes the ignition and the maintenance of plasma, enhancing the degradation performance at low input powers. However, too small packing pellets decrease the gas residence time and reduce the degradation efficiency, especially for the input power beyond 80 W. Besides, lowering the packing size promotes the generation of SO2, while reduces the yields of S-O-F products, corresponding to a better degradation. After the discharge, the pellet surface becomes smoother with the appearance of S and F elements. Density functional theory calculations show that SF6 is likely to be adsorbed at the Al-III site over the gamma-Al2O3(110) surface, and it is much more easily to decompose than in the gas phase. The fluorine gaseous products can decompose and stably adsorb on the pellet surface to change the surface element composition. This work provides a better understanding of SF6 degradation in a PB-DBD system.
Keywords: A1 Journal article; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
Impact Factor: 4.4
DOI: 10.1049/HVE2.12230
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“Tailoring mechanical properties and shear band propagation in ZrCu metallic glass nanolaminates through chemical heterogeneities and interface density”. Brognara A, Kashiwar A, Jung C, Zhang X, Ahmadian A, Gauquelin N, Verbeeck J, Djemia P, Faurie D, Dehm G, Idrissi H, Best JP, Ghidelli M, Small Structures , 2400011 (2024). http://doi.org/10.1002/SSTR.202400011
Abstract: The design of high‐performance structural thin films consistently seeks to achieve a delicate equilibrium by balancing outstanding mechanical properties like yield strength, ductility, and substrate adhesion, which are often mutually exclusive. Metallic glasses (MGs) with their amorphous structure have superior strength, but usually poor ductility with catastrophic failure induced by shear bands (SBs) formation. Herein, we introduce an innovative approach by synthesizing MGs characterized by large and tunable mechanical properties, pioneering a nanoengineering design based on the control of nanoscale chemical/structural heterogeneities. This is realized through a simplified model Zr 24 Cu 76 /Zr 61 Cu 39 , fully amorphous nanocomposite with controlled nanoscale periodicity ( Λ , from 400 down to 5 nm), local chemistry, and glass–glass interfaces, while focusing in‐depth on the SB nucleation/propagation processes. The nanolaminates enable a fine control of the mechanical properties, and an onset of crack formation/percolation (>1.9 and 3.3%, respectively) far above the monolithic counterparts. Moreover, we show that SB propagation induces large chemical intermixing, enabling a brittle‐to‐ductile transition when Λ ≤ 50 nm, reaching remarkably large plastic deformation of 16% in compression and yield strength ≈2 GPa. Overall, the nanoengineered control of local heterogeneities leads to ultimate and tunable mechanical properties opening up a new approach for strong and ductile materials.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
DOI: 10.1002/SSTR.202400011
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