Technology and Structure of Nanomaterials

Staff:

doc. Ing. Gražyna Simha Martynková, Ph.D. - Head of Department

Ing. Karla Čech Barabaszová, Ph.D.
Ing. Sylva Holešová, Ph.D.

Ing. Marianna Hundáková, Ph.D.

Bc. Lucie Hurníková

Ing. Jana Kupková, Ph.D.
Ing. Lucie Chlebíková, Ph.D. - Safety Technician
RNDr. Marta Valášková, DSc.

Ing. Lenka Pazourková, Ph.D.

Ing. Diana Klushina - Internal Doctoral Student

Research

Nanomaterials based on modified inorganic layered structures mainly silicates, that are prepared using following technologies:

  • intercalation and grafting of layered minerals, with organic and organometallic molecules and complex ions,

  • synthesis of metal nanoparticles, their oxides and sulphides in nanoreactor of interlayerspace and surface of silicate matrix,

  • preparation of nanocomposite coatings on silicate matrices,

  • preparation of nanocomposites type silicate-carbon-polymer

  • mechanical and mechano-chemical praparation of nanoparticles and nanocomposites,

  • preparation of micro- and nanoparticles with dry jet milling, cryomilling and ultrasound techniques, in combination with the microwave field, chemical or electrochemical etching,

  • chemical preparation of silicate nanoparticles (delamination).

Study of friction composites and nanocomposites with carbon component, focusing on:

  • evaluation of friction layers after friction process,

  • tribochemistry,

  • optimization of the composition of the friction composites,

  • evaluation of friction materials for the preparation of composites,

  • polytypism and defects in the structure of graphite and their influence on the properties of composites,

  • development and characterization of nanocomposite materials and nanoceramics: oxide and silicate ceramics,

  • metal nanocomposites with nanoparticles (carbon, metal oxides),

  • modification of polymer fibers with organic antibacterial agents.

  • Mechanism of friction processes.

  • Tribochemistry.

  • Investigation of friction material components and their mutual interactions.

  • Optimization of friction materials composition.

  • Evaluation of friction products (i.e. friction layers and friction debris).

 

Characterization of nanomaterials and composites prepared in relation to ongoing technology using a combination of diffraction and spectroscopic methods, electron microscopy and atomic force microscopy, evaluation particle sizes and surfaces, chromatography and other analytical methods. Besides experimental methods we use computer-aided design of nanomaterials - molecular simulations (molecular mechanics and molecular dynamics), which allows to interpret the experimental data, analyze and predict the structure and properties. Dynamic calculations of atomic and molecular clusters in supramolecular structures with an inorganic matrix are implemented in Materials Studio modeling environment, Accelrys.

 

Equipment:

X-ray diffraction analysis laboratory

  • X-ray powder diffractometerINEL

wide angle position sensitive detector CPS120, horizontal multipurpose goniometer MPG with monochromatized primary beam( Cu anode, flat Ge monchromator), sample holders (flat and capillary) for reflex and transmission geometry.

  • X-ray powder diffractometerBruker

generator Krystalloflex K780 (50kV, 60mA),  radiation source Co x–ray tube, scintillation and position sensitive detectors, “grazing incidence mode’, high temperature chamber (mri basic – up to 1600°C), database PDF-2 (2004).

  • X-ray powder diffractometerRigaku Ultima IV

For strain, texture, thin layer measurement , micro-analysis, small angle methods (SAXS) CBO/CBO-f optics.

Equipped with: Bragg-Brentano geometry, parallel beam method, D/teX – Ultra high speed detector, transmission capillary method, high temperature chamber, x,y,z positioning CCD camera, Cu radiation source a software PDXL Crystallinity software, Lattice stress, PDXL Lattice parameter refinement, PDXL Stress, PDXL quantity, SAXS Software: NANO-solve Particle and Pore size analysis, Long-period structure Analysis Software.

 

Laboratory of microscopy

  • Light microscope -OLYMPUS BX51

    Equipped with: UC30 camera and Stream Essential Software. Enables analysis in dark field using polarized light.

  • Atomic force microscope -EXPLORERTM

Measurement  in contact and non-contact mode, dry and liquid scanning , AFM dry scanner, 8 microns z, linearized, maximal range x,y: 100 x 100 microns
Dry scanner, 8 microns in z direction, maximum range in x,y direction: 100 x 100 microns.
Liquid scanner, 8 microns in z direction, maximum range in x,y direction: 100 x 100 microns. 
Dry scanner, 0.8 microns in z direction, maximum range in x,y direction: 2 x 2 microns.
Liquid scanner, 0.8 microns in z direction, maximum range in x,y direction: 2 x 2 microns.

 

Nanomilling laboratory

  • Jet mill -STURTEVANT

circular milling chamber 2´´, 3.37 kW power, milling capacity 0.23-0.91 kg/h, milling dimensions below 1 micron, milling energy-compressed air, air consumption  0.0094 m3s-1/ 7.5 kW, power 5 kW, the output particle size depends on feed/milling pressure of air.

  • Particle size analyser -HORIBA LA-950V2

measurement range 10 nm – 3 mm, wet and dry measurement, small-volume cell, particle size distribution and statistical evaluation, diffraction index analysis.

  • Particle size analyzer -NANOPARTICA SZ

measurement range 0.3nm-0.008mm at 90 and 173° angle, automatic analysis of mono – and polydispersions,  Zeta potencial analysis – range from -200 to+ 200 mV., measurement area 1×103 - 2×107 g/mol, molecular weight analysis.

  • Surface area and porosity of particles analysis -THERMO SCIENTIFIC SURFER

specific surface area analysis, pore size distribution, fyzisoption, chemisorption.

 

Molecular modeling laboratory

  • Materials Studio (MS) Accelrys 4.1.

Software for molecular modeling Accelrys. Computer design of nanomaterials using molecular modeling (i.e molecular mechanics and classical molecular dynamics) is used to predict the structure and properties of intercalated and surface-modified host structures and nanocomposites. Laboratory of molecular modeling and computational chemistry is equipped with two HP workstations with high-performance graphics and two licenses for Materials Studio software package for molecular modeling. Solved problems: The structure and properties of intercalated layered silicates  and  their surface-modified with organic molecules, dyes, aliphatic amines and polymer. Interface study of nanoparticles of metals, their oxides and sulphides in silicate nanocomposites.