· Synthesis and surface modifications of nanoparticles for cancer detection and therapy

· Advanced metrology at the nanoscale - characterization of nanoparticles, critical in the biomedical applications (size and size distribution, interparticle interactions, as well as interactions within human body environment). Comparison study by AFM/STM, DLS, SEM/TEM

Contact:

Prof. Jarosław Grobelny, DSc, PhD

Prof. Grzegorz Celichowski, DSc, PhD

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Research on tribochemical mechanisms, mainly in zinc, copper, nickel and antimony salts of O,O-diesters of dialkylo(arylo)dithiophosphoric acid and O,O,S-triesters of dialkylo(alkoxy)dithiophosphoric acid, in the friction of steel and ceramic materials.

Contact:

Stanecka-Badura, PhD

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Nanoparticles for biomedical applications

(nano-bio-technology research)

Research areas

The main idea of this work was based on introducing organo-phosphoric and thiophosphoric compounds into thin solid films obtained by sol-gel technique, as modifiers for improving their tribological properties. All films are deposited by dip-coating method on silicon, glass and metal substrates with carefully controlled thickness in the range of 20-500 nm. (3-aminpropyl)-triethoxysilane was used as a precursor in the sol-gel process of obtaining aminosilica films. Amine chemical group present in these films plays a “chemical anchor” role for a wide range of modifiers. Chemical changes in the sol-gel films, during all steps of post-treatments and modifications, were monitored by FT-IR spectroscopy and SIMS spectrometry. Topographies of modified surfaces were imaged using the atomic force microscopy (AFM). As the result of these modifications, significant improvement of frictional properties was observed. Friction coefficient in no lubrication friction reaches as low the value as 0,03.

Contact

Prof. Grzegorz Celichowski, DSc, PhD

Functionalization of sol-gel thin films for tribological applications

Research focused on various aspects of sol-gel chemistry, including synthesis and characterization of nano-objects (nanotubes, nanoparticles) and thin ceramic layers.

Thin films and thin coatings deposited on such substrates like silicon, glass and metals are particularly in the center of interests. Research covers the influence of porosity, surface modification and the presence of nanophase dispersed in the coating, on the physicochemical properties of the coating. The influence of these parameters on tribological properties is also measured in micro- and nano– scale.

The following materials and their composites are investigated: silica, alumina, zirconia, vanadia but particularly titania, due to its multipurpose applications and properties.

 

Contact

Ireneusz Piwoński, DSc, PhD

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Study of relations between superhydrophobic structure components—their chemical constitution and topography—and ice adhesion. Adhesion of ice to a surface is related to surface hydrophobic properties, thus an important part of the research is the influence of surface structure components on its wetting by water. Of particular interest is the transition between partial wetting (Cassie) mode and fully wetted (Wenzel) state on superhydrophobic surfaces

Contact

Prof. Grzegorz Celichowski, DSc, PhD

Maciej Psarski, PhD

Influence of superhydrophobic surface chemical structure and topography on its icephobic properties

These studies are on chemical modification of different surfaces, such as silicon, titanium, aluminum, cobalt, gold and copper by various ultrathin fluoororganic films. The surfaces were modified by using the vapor and solutions phase. The aim of the modification process was to obtain ultrathin films of organosilanes and self-assembled monolayers which minimize adhesion, friction and wear. Preparation of ultrathin films was designed to increase surface resistance in physiological conditions and laboratory environments. The results of tribological research in nano- and microscale allowed me to describe the conclusions that the structure of compounds influence on coefficient of friction values.

In these studies wear used a variety of techniques (Secondary Ion Mass Spectrometry with time of flight mass analyzer-ToF-SIMS, X-ray photoelectron spectroscopy-XPS, infrared spectroscopy –FT-IR, scanning tunneling microscopy - STM). These techniques allow the verification of film preparation and bond formation between compounds and modified surfaces. Atomic force microscopy – AFM and microtribometer, have enabled tribological investigations in nano- and micronewton load range. Magnetic force microscopy– MFM, observation of the magnetic structure of the cobalt films composed of domains with a considerable component of magnetization perpendicular to the film surface.

Contact

Michał Cichomski, DSc, PhD

Preparation and study of self-assembled monolayers

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These studies are focused on the analysis of the magnetic domain structure and morphological structure of massive monocrystalline cobalt magnets anisotropic sintered Nd -Fe -B and SmCo5 , nanocrystalline magnets Nd2Fe14B/Fe3B , and thin layers permalloy and cobalt . The use of magnetic force microscopy made it possible to increase the resolution imaging of magnetic domain structures , and hence the possibility of a deeper knowledge and understanding of magnetic domains and their subtle

structure. Another undertaken research area was the investigation of the magnetic structure of the cobalt film before and after modification by silanes. This issue is important because of the use of cobalt and its alloys in magnetic sensors and magneto-optics. Cobalt and its alloys have also been used in the military, aerospace industry and also in biomedical applications, including the therapy of cardiovascular diseases and orthopedics. The widespread use of cobalt alloys is associated with their high resistance to corrosion and wear, and their tolerance in an environment of tissue and body fluids.

They exhibit different magnetic properties, such as magnetic anisotropy, magnetic microstructure, coercivity and magnetoresistance, depending on their thickness, composition, crystalline structure and preparation conditions.

 

These studies were performed in collaboration with Prof. Witold Szmaja from the Department of Solid State Physics , University of Lodz

Contact

Michał Cichomski, DSc, PhD

The study of the magnetic domain structure and morphological structure using magnetic force microscopy (MFM )