Krzysztof Tadyszak- Doctor in Physical Sciences, Specialty: Solid State Physics
- Physicst at Institute of Molecular Physics of the Polish Academy of Sciences
Krzysztof Tadyszak
- Doctor in Physical Sciences, Specialty: Solid State Physics
- Physicst at Institute of Molecular Physics of the Polish Academy of Sciences
Electron paramagnetic resonance and electric conductivity of fibers (carbon, polymers)
About
67
Publications
35,054
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1,116
Citations
Introduction
Currently I am workng at Institute of Macromolecular Chemstry Czech Academy of Sciences in Prague
https://orcid.org/0000-0002-0370-9766
https://www.researchgate.net/profile/Krzysztof_Tadyszak
https://scholar.google.pl/citations?user=wnlIbk8AAAAJ&hl=pl&oi=ao
Skills and Expertise
Current institution
Additional affiliations
September 2019 - August 2021
September 2011 - present
Position
- Assistent
Description
- EPR measurements
June 2012 - present
Position
- Physicist
Description
- Electron paramagnetic resonance and electric conductivity of fibers (carbon, polymers) obtained via multiple techniques hydrothermal, a wet-spinning, centrifugal melt casting, electrospinning.
Education
September 2008 - June 2013
Field of study
- Solid state physics, electron paramagnetic resonance
September 2003 - June 2008
September 1998 - June 2003
Electrical College no. 2 in Poznan
Field of study
- Electronics
Publications
Publications (67)
Synthesis and characterization of lithium phthalocyanine radicals were performed, which were followed by an investigation on its ability to detect oxygen levels in biologically relevant concentrations. EPR studies confirmed the presence of at least two phases, one sensitive to oxygenation (γ-phase) and the second one insensitive to oxygenation (α-p...
This study presents the experimental and theoretical modeling results of pressure changes caused by fluid flow in a water aspirator (water pump) whose working principle is based on the Venturi effect. Experimentally measured pressure drop in a glass-made device is modeled in COMSOL Multiphysics by previously reproducing the device geometry. Computa...
The performed research presents modeling results for designing microfluidic vortex diodes. These devices rectify fluid flow and can be used in many applications on micro and macro scales. The modeling, utilizing computational fluid dynamics (CFD) with the turbulence model RANS k-ε in COMSOL Multiphysics, has led to optimizing diodicity—the reversed...
We report applying the autoclaved hydrothermal method for obtaining conductive reduced graphene oxide (rGO) fibers for potential flexible electronic applications, such as supercapacitors, transistors, or sensing applications. The reduction of GO was performed in the temperature range 120 to 180 °C under increased pressure of ca. 8 bar in a sealed T...
Topographical cues on materials can manipulate cellular fate, particularly for neural cells that respond well to such cues. Utilizing biomaterial surfaces with topographical features can effectively influence neuronal differentiation and promote neurite outgrowth. This is crucial for improving the regeneration of damaged neural tissue after injury....
A new method for the preparation of polyaniline (PANI) films that have a 2D structure and can record high active mass loading (up to 30 mg cm⁻²) via acid-assisted polymerization in the presence of concentrated formic acid was developed. This new approach represents a simple reaction pathway that proceeds quickly at room temperature in quantitative...
This article focuses on EPR relaxation measurements in various carbon samples, e.g., natural carbons—anthracite, coal, higher anthraxolites, graphite; synthetically obtained carbons—glassy carbons, fullerenes, graphene, graphene oxide, reduced graphene oxide, graphite monocrystals, HOPG, nanoribbons, diamonds. The short introduction presents the ba...
Ecofriendly hydrothermal reduction of graphene oxide is widely used for producing hydrogels and aerogels, but it yields partly reduced graphene oxide (prGO) containing oxygen groups and some number of paramagnetic centers (PCs). In order to identify structural changes introduced by the reduction process, these PCs are studied by electron spin echo...
We present a thoroughgoing electron paramagnetic resonance investigation of polydopamine (PDA) radicals using multiple electron paramagnetic resonance techniques at the W-band (94 GHz), electron nuclear double resonance at the Q-band (34 GHz), spin relaxation, and continuous wave measurements at the X-band (9 GHz). The analysis proves the existence...
The application of two-dimensional (2D) materials as a building component for aerogels formation allows obtaining three-dimensional (3D) structures featured by remarkable physiochemical properties. One of the most commonly applied 2D materials for the aerogels fabrication is a graphene oxide (GO), which can undergo chemical or thermal reduction for...
The shape and intrinsic pore structure of pristine and partially reduced graphene oxide (prGO) aerogels/hydrogels was imaged using three complementary techniques: Magnetic Resonance Imaging (MRI), Computer Tomography (CT) and Electron Paramagnetic Resonance Imaging (EPRI). Each method is sensitive to different features of the sample: CT images are...
Two-dimensional (2D) materials remain highly interesting for assembling three-dimensional (3D) structures, among others, in the form of macroscopic hydrogels. Herein, we present a novel approach for inducing chemical inter-sheet crosslinks via an ethylenediamine mediated reaction between Ti3C2Tx and graphene oxide in order to obtain a reduced graph...
The arrangement of two-dimensional graphene oxide sheets has been shown to influence physico-chemical properties of the final bulk structures. In particular, various graphene oxide microfibers remain of high interest in electronic applications due to their wire-like thin shapes and the ease of hydrothermal fabrication. In this research, we induced...
Carbon nanostructures are utilized in a plethora of applications ranging from biomedicine to electronics. Particularly interesting are carbon nanostructured quantum dots that can be simultaneously used for bimodal therapies with both targeting and imaging capabilities. Here, magnetic and optical properties of graphene oxide quantum dots (GOQDs) pre...
Micro-sized structures made from graphene oxide (GO) attract high interest for their extensive use in tissue engineering. The fabrication and cytotoxicity of 3D graphene-based scaffolds so far have not been extensively discussed with relation to the flake sizes used. In this work we considered GO flakes of two different lognormal size distributions...
Complex magnetic behavior of pristine, partially reduced graphene oxide aerogel with C/O ratio of 2.35 (EDS)
with full analysis of oxygen rich groups attached to the surface is reported. Purity of the system was confirmed
by three techniques: elemental analysis, EDS, EPR at 4.2 K none of them detected traces of transition metal ions,
especially iro...
3D glassy carbon structures with different pore diameters were obtained by pyrolysis of the sucrose via sugar blowing technique. The porous-cellular foam structure was obtained by applying a blowing agent in the form of ammonium chloride before pyrolysis at 1100 °C under argon environment. Physical and biological properties of the carbons, synthesi...
Transition metal atoms adsorbed on surfaces (adatoms) behaving like magnets are important for potential applications in quantum computing and memory storage. Better insight into their magnetic properties, described by spin Hamiltonian (SH) parameters, is essential. Comprehensive modeling of SH parameters for Fe²⁺ with spin S = 2 adatoms on various...
The effect of UV light on one of the most common minerals on Earth – calcite (CaCO3), has been little investigated, despite its significant implications for many areas of research, such as dating and dosimetry, photodegradation of CaCO3-containing materials, and conservation of historical objects. In this study, conducted on nano- and micro-grained...
Transition metal atoms adsorbed on surfaces (adatoms) behave like magnets in nanoscale and have potential applications in quantum computing. Scanning tunneling microscopy and inelastic tunneling spectroscopy studies yield the spin Hamiltonian parameters. Semi-empirical approach based on crystal-field and microscopic spin Hamiltonian theory is emplo...
According to theoretical predictions, the magnetic properties of MXene structures are determined by the properties of the constitutive transition metals, defects in the MXene layers and the surface functional groups. We studied the magnetic properties of differently functionalized multilayered Ti 3 C 2 T x MXenes and compared them with those of Ti...
The high specific surface area of multilayered two-dimensional carbides called MXenes, is a critical feature for their use in energy storage systems, especially supercapacitors. Therefore, the possibility of controlling this parameter is highly desired. This work presents the results of the influence of oxygen concentration during Ti3AlC2 ternary c...
This book was prepared by the employees of the NanoBioMedical Centre at the Adam Mickiewicz University to commemorate the 100th anniversary of the Poznań University foundation. In this book, we present our artistic interpretation of the photographs published in our free accessible internet book „Microstructures - photo album”. In this book we prese...
This work presents the preparation and characterization of pristine and transition metal doped partially reduced graphene oxide aerogels. The step-by-step preparation of aerogels from graphene oxide with an assistance of VCl3, CrCl3, FeCl2·4H2O, CoCl2, NiCl2 and CuCl2 chlorides as reducing agents is shown and explained. The influence of reducing ag...
Graphene and graphene oxide (GO) structures and their reduced forms, e.g., GO paper and partially or fully reduced three-dimensional (3D) aerogels, are at the forefront of materials design for extensive biomedical applications that allow for the proliferation and differentiation/maturation of cells, drug delivery, and anticancer therapies. Various...
Book was prepared by the employees of the NanoBioMedical Center at the Adam Mickiewicz University to commemorate the 100th anniversary of the Poznań University foundation.
In this book, we present photographs of advanced nano and micro-materials prepared at our Centre, captured thanks to the cutting-edge and innovative microscopic techniques: scan...
Studies of magnetic adatoms on surfaces utilize experimental techniques (scanning tunneling microscopy (STM), inelastic tunneling spectroscopy (ITS) and ab-initio modeling methods. Several fundamental issues involved in these studies, being of utmost importance in view of potential technological applications, are critically examined and elucidated....
Oxygenation is one of the most important physiological parameters of biological systems. Low oxygen concentration (hypoxia) is associated with various pathophysiological processes in different organs. Hypoxia is of special importance in tumor therapy, causing poor response to treatment. Triaryl methyl (TAM) derivative radicals are commonly used in...
Magnetic properties of core-shell Fe3O4@SiO2 nanoparticles were measured with use of AC and DC magnetometry. Particles were in form of crystalline magnetic core of 11.5 nm and an amorphous silica shell. The magnetic measurements confirmed superparamagnetic nature of particles. Hysteresis loops exhibit typical temperature dependence of coercivity Hc...
The spin Hamiltonian (SH) parameters experimentally determined by EMR (EPR) may be corroborated or otherwise using various theoretical modeling approaches. To this end semiempirical modeling is carried out for high-spin (S = 2) manganese (III) 3d⁴ ions in complex of tetraphenylporphyrinato manganese (III) chloride (MnTPPCl). This modeling utilizes...
Calcite, the most stable polymorph of calcium carbonate (CaCO3), attracts growing attention due to its wide applications in many fields, such as: composite materials, food industry, biomineralization and dating of archaeological and geological objects. Our study shows the influence of UV, X-ray and gamma radiation on the mechanical and physico-chem...
Superparamagnetic behavior in aqueously well dispersible magnetite core-shell Fe3O4@SiO2 nanoparticles is presented. The magnetic properties of core-shell nanoparticles were measured with use of the DC, AC magnetometry and EPR spectroscopy. Particles where characterized by HR-TEM and Raman spectroscopy, showing a crystalline magnetic core of 11.5 ±...
Specific distortions of the EPR signal of bulk anthracite are observed at low temperatures. They are accompanied by variations in the microwave oscillator frequency and are explained by the manifestation of the Rabi splitting due to the strong coupling between electron spins and the cavity, combined with the use of an automatic frequency-control (A...
ZnO:Er3+-Yb3+@Gd2O3 nanostructures were obtained by wet chemistry methods - sol-gel technique for preparation ZnO nanoparticles (NPs), and seed deposition method - for obtaining Gd2O3. The crystal structure, morphology, phase and elemental composition, resonant microwave absorption of rare earth ions, point defects in ZnO@Gd2O3 crystal structure an...
Epitaxial thin films of double perovskite Y(Ni0.5Mn0.5)O3(001) and Y(Ni0.5Mn0.5)O3(101) grown on SrTiO3(001) and SrTiO3(111), respectively, were studied by XPS and SQUID magnetometer. Temperature dependent Ti diffusion was detected in the Y(Ni0.5Mn0.5)O3(101)/SrTiO3(111) samples, while no diffusion was observed in Y(Ni0.5Mn0.5)O3(001)/SrTiO3(001) s...
Electron paramagnetic resonance spectroscopy of conduction electrons, i.e. Conduction Electron Spin Resonance (CESR), is a powerful tool for studies of carbon samples. Conductive samples cause additional effects in CESR spectra that influence the shape and intensity of the signals. In cases where conduction electrons play a dominant role, whilst th...
Anthracite, with carbon content of 93.5 wt% and 2.7 wt% of hydrogen, was studied by electron paramagnetic resonance (EPR), electrical conductivity and static magnetic susceptibility measurements, in the temperature range of 2–300 K. The EPR measurements were carried out on powder and bulk samples. The EPR signal of the thin bulk sample represented...
A study concerning the image quality in electron paramagnetic resonance imaging in two-dimensional spatial experiments is presented. The aim of the measurements was to improve the signal-to-noise ratio (SNR) of the projections and the reconstructed image by applying modulation amplitude higher than the radical electron paramagnetic resonance linewi...
A thorough investigation of biomimetic polydopamine (PDA) by electron paramagnetic resonance (EPR) is shown. In addition temperature dependent spectroscopic EPR data are presented in the range of 3.8-300 K. Small discrepancies in magnetic susceptibility behaviour are observed between previously reported melanin samples. These variations were attrib...
We studied magnetic properties of a composite of paran and graphene akes. Magnetic properties of this composite were investigated by ferromagnetic resonance/electron spin resonance technique. The ferromagnetic resonance signal from graphene suspension in paran is broad and shifted from magnetic eld corresponding to g ≈ 2 to the low magnetic eld. Th...
Thin polymer films from 1-naphthylamine have been obtained for the first
time by polymerization at the cathode and anode in DC discharge. The
morphology of the films synthesized at the cathode was examined by SEM
and AFM. The elemental composition, chemical structure, and thermal
stability of the polymer have been studied by pyrolysis chromatograph...
We report electron paramagnetic resonance (EPR) evidence of the antiferromagnetic ordering in pristine single-layer graphene. Temperature dependences of the parameters of EPR spectra obtained for vacuum-processed samples were studied within the temperature range of 4.2–300 K. Our experiment has confirmed recent theoretical predictions that in singl...
EPR measurements at X-band were performed in the temperature range 4.2-300 K with angular dependence measurements at 77 K for Cu(2+) in KZnClSO(4).3H(2)O. Rigid lattice spin-Hamiltonian parameters are: g(z) = 2.4247, g(y) = 2.0331, g(x) = 2.1535, A(z) = -103 x 10(-4) cm(-1), 63 x 10(-4) cm(-1), and -31 x 10(-4) cm(-1). The parameters were analyzed...
The X-band EPR and magnetic susceptibility in the temperature range 4.2–300 K study of the shungite-I, natural nanostructured material from the deposit of Shunga are reported. Obtained results allow us to assign the EPR signal to conduction electrons, estimate their number, N
P, and evaluate the Pauli paramagnetism contribution to shungite suscepti...
Questions
Questions (5)
Our hard drive is damaged. We tried to instal the system on a bigger one but an error occurred. Probably only hard drives from the list below will work. If you are able to help us please contact.
40MB Hard Disk D3142
90MB Hard Disk M2612SA
180MB Hard Disk M2614SA
I am interested in the code so that I could be able to extend it to higher dimensions
I am using Endnote for references in articles. How can find or identify an article using the article number which appears in the unformatted reference e.g. #71, which I assume corresponds to a specific article in my database. Let say that the full entry looks like {May, 2003 #71}. Differently, having only the number #71 how can I find the article in my database?
I know from E500 brochure that Bruker has implemented this option in this spectrometer, but is it possible to apply this in other devices and if than how to do it?
