Mykhailo Motylenko

TU Bergakademie Freiberg

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David Rafaja

TU Bergakademie Freiberg

Marcin Wysokowski

Poznań University of Technology

Teofil Jesionowski

Poznań University of Technology

Christian Schimpf

TU Bergakademie Freiberg

Hermann Ehrlich

Adam Mickiewicz University in Poznań

Vasilii V. Bazhenov

European X-Ray Free-Electron Laser

Enrico Langer

TU Dresden

СЛ

С. Л. Молодцов

European X-Ray Free-Electron Laser

Roberta Galli

TU Dresden

Dirk C. Meyer

TU Bergakademie Freiberg

Cooperative Institutions

TU Bergakademie Freiberg

TU Dresden

Poznań University of Technology

Centre National de la Recherche Scientifique

Chemnitz University of Technology

Institute of Chemical Technology

Russian Academy of Sciences

Czech Academy of Sciences, Institute of Physics

Leibniz Institute for Solid State and Materials Research

Institute of Experimental Physics of the Slovak Academy of Sciences

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Synthesis of nanostructured chitin–hematite composites under extreme biomimetic conditions

RSC Advances (2014)

Marcin Wysokowski Mykhailo Motylenko Juliane Walter Grzegorz Lota Jarosław Wojciechowski

Chitin of poriferan origin is a unique and thermostable biological material. It also represents an example of a renewable materials source due to the high regeneration ability of Aplysina sponges under marine ranching conditions. Chitinous scaffolds isolated from the skeleton of the marine sponge Aplysina aerophoba were used as a template for the in vitro formation of Fe2O3 under conditions (pH ∼ 1.5, 90 °C) which are extreme for biological materials. Novel chitin–Fe2O3 three dimensional composites, which have been prepared for the first time using hydrothermal synthesis, were thoroughly characterized using numerous analytical methods including Raman spectroscopy, XPS, XRD, electron diffraction and HR-TEM. We demonstrate the growth of uniform Fe2O3 nanocrystals into the nanostructured chitin substrate and propose a possible mechanism of chitin–hematite interactions. Moreover, we show that composites made of sponge chitin–Fe2O3 hybrid materials with active carbon can be successfully used as electrode materials for electrochemical capacitors.

Sponge

Hydrothermal Synthesis

10.1039/c4ra10017d

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Citations (55)

Investigation of the Bonding Mechanisms of Al Coatings on Ceramic Substrates Deposited by Cold Gas Spraying and Magnetron Sputtering

Thermal spray (2015)

R. Drehmann Thomas Grund Thomas Lampke B. Wielage Christina Wüstefeld

Abstract The present work builds on investigations of cold gas-sprayed Al coatings on Al2O3, which strongly indicated that heteroepitaxial growth is a possible mechanism supporting the adhesion between metal and ceramic at their interface. The present study was focused on the deposition of Al on further ceramic substrates (AlN, Si3N4 and SiC). In particular, it should be clarified whether the different ionicity of the chemical bonding in these substrate materials influences the interface formation or not. Aluminum coatings were deposited alternatively by using cold-gas spraying (CGS) and magnetron sputtering. In CGS coatings, the effect of substrate roughness, substrate temperature and powder fraction on the adhesion of the coating was investigated. The magnetron-deposited coatings were used to evaluate the role of the heteroepitaxy in the interface formation and to identify microstructure defects in the metal/ceramic interface, which are caused solely by the lattice misfit between the counterparts and not by the impact-induced deformation that is typical for cold gas-sprayed coatings. Interface characterization was conducted by scanning electron and high resolution transmission electron microscopies combined with XRD.

Cavity magnetron

10.31399/asm.cp.itsc2015p0544

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Citations (3)

Extreme biomimetics: Preservation of molecular detail in centimeter-scale samples of biological meshes laid down by sponges

Science Advances (2019)

Iaroslav Petrenko Adam P. Summers Paul Simon Sonia Żółtowska‐Aksamitowska Mykhailo Motylenko

Fabrication of biomimetic materials and scaffolds is usually a micro- or even nanoscale process; however, most testing and all manufacturing require larger-scale synthesis of nanoscale features. Here, we propose the utilization of naturally prefabricated three-dimensional (3D) spongin scaffolds that preserve molecular detail across centimeter-scale samples. The fine-scale structure of this collagenous resource is stable at temperatures of up to 1200°C and can produce up to 4 × 10-cm-large 3D microfibrous and nanoporous turbostratic graphite. Our findings highlight the fact that this turbostratic graphite is exceptional at preserving the nanostructural features typical for triple-helix collagen. The resulting carbon sponge resembles the shape and unique microarchitecture of the original spongin scaffold. Copper electroplating of the obtained composite leads to a hybrid material with excellent catalytic performance with respect to the reduction of p-nitrophenol in both freshwater and marine environments.

Nanoporous

Biomimetics

Sponge

Template

3d printed

10.1126/sciadv.aax2805

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Citations (66)

Phase transformations on nanometre scale

Acta Crystallographica Section A Foundations of Crystallography (2013)

David Rafaja Christina Wüstefeld Christian Schimpf Mykhailo Motylenko

Nanometre

10.1107/s0108767313098577

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Citations (0)

Effect of the stoichiometry of niobium oxide on the resistive switching of Nb 2 O 5 based metal–insulator–metal stacks

Journal of Electron Spectroscopy and Related Phenomena (2015)

Florian Hanzig Hannes Mähne Jozef Veselý Helge Wylezich Stefan Slesazeck

Stoichiometry

Metal-insulator-metal

Niobium oxide

10.1016/j.elspec.2015.04.013

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Citations (16)

Microstructure study on BN nanocomposites using XRD and HRTEM

Oldenbourg Wissenschaftsverlag eBooks (2008)

Mykhailo Motylenko V. Klemm Gerhard Schreiber David Rafaja M. Schwarz

10.1524/9783486992564-007

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An extreme biomimetic approach: hydrothermal synthesis of β-chitin/ZnO nanostructured composites

Journal of Materials Chemistry B (2013)

Marcin Wysokowski Mykhailo Motylenko Hartmut Stöcker Vasilii V. Bazhenov Enrico Langer

β-Chitinous scaffolds isolated from the skeleton of marine cephalopod Sepia officinalis were used as a template for the in vitro formation of ZnO under conditions (70 °C) which are extreme for biological materials. Novel β-chitin/ZnO film-like composites were prepared for the first time by hydrothermal synthesis, and were thoroughly characterized using numerous analytical methods including Raman spectroscopy, HR-TEM and XRD. We demonstrate the growth of hexagonal ZnO nanocrystals on the β-chitin substrate. Our chitin/ZnO composites presented in this work show antibacterial properties against Gram positive bacteria and can be employed for development of inorganic-organic wound dressing materials.

Sepia

Hydrothermal Synthesis

10.1039/c3tb21186j

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Citations (92)

Thermodynamic assessment and first principle calculations of the Na Sb Sn system

Journal of Alloys and Compounds (2016)

Liya Dreval Matthias Zschornak Wolfram Münchgesang Olga Fabrichnaya David Rafaja

CALPHAD

Ternary numeral system

10.1016/j.jallcom.2016.11.003

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Citations (8)

Extreme biomimetic approach for developing novel chitin-GeO2 nanocomposites with photoluminescent properties

Nano Research (2015)

Marcin Wysokowski Mykhailo Motylenko Jan Beyer Anna A. Makarova Hartmut Stöcker

Thermal Stability

Hexagonal phase

Biomolecule

10.1007/s12274-015-0739-5

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Citations (68)

Interface phenomena in (super)hard nitride nanocomposites: from coatings to bulk materials

Chemical Society Reviews (2012)

David Rafaja Christina Wüstefeld Mykhailo Motylenko Christian Schimpf T. Barsukova

Mechanical properties of nanocomposites usually surpass the mechanical properties of their micro-structured and single-crystalline counterparts. This is mainly due to an extremely high density of internal interfaces in nanocomposites like grain, crystallite and phase boundaries. When compared to diamond, carbides and borides, nitrides are of interest because of their high temperature oxidation resistance and compatibility with iron containing alloys. This tutorial review classifies the contributions of various internal interfaces to the hardness of the nanocomposites, and appreciates the outstanding role of partially coherent phase boundaries in the hardness enhancement. With selected examples of transition metal nitrides containing aluminium and silicon as well as of boron nitrides, it is explained how the nanocomposites with partially coherent phase boundaries and thus with enhanced hardness can be synthesised. As the possible ways of the formation of coherent phase boundaries, the local epitaxial growth of phases with limited mutual solubility, the production of supersaturated solid solutions followed by the segregation of elements during the spinodal decomposition and the incomplete phase transformation are discussed. The most important techniques, used for synthesis of nitride nanocomposites, like CVD, PVD, precursor-based methods, mechanical alloying and high-pressure-high-temperature synthesis are briefly reviewed. Besides, a short overview on hardness definitions and hardness measurements is included.

Interface (matter)

10.1039/c2cs15351c

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Citations (30)