Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk


K. Sobczak

Ostatnie publikacje
1.  Olusegun S., Souza Guilhermina de O., Sutuła S., Osial M., Krajewski M., Pękała M., Sobczak K., Felis E., Krysiński P., Methotrexate anti-cancer drug removal using Gd-doped Fe3O4: Adsorption mechanism, thermal desorption and reusability, Groundwater for Sustainable Development, ISSN: 2352-801X, DOI: 10.1016/j.gsd.2024.101103, Vol.25, pp.1-9, 2024

Słowa kluczowe:
Adsorption,Thermal desorption,Gd-doped Fe3O4,Methotrexate

Afiliacje autorów:
Olusegun S. - inna afiliacja
Souza Guilhermina de O. - inna afiliacja
Sutuła S. - inna afiliacja
Osial M. - IPPT PAN
Krajewski M. - inna afiliacja
Pękała M. - inna afiliacja
Sobczak K. - inna afiliacja
Felis E. - inna afiliacja
Krysiński P. - inna afiliacja
2.  Jain A., Manippady S., Tang R., Nishihara H., Sobczak K., Matejka V., Michalska M., Vanadium oxide nanorods as an electrode material for solid state supercapacitor, Scientific Reports, ISSN: 2045-2322, DOI: 10.1038/s41598-022-25707-z, Vol.12, No.21024, pp.1-12, 2022

The electrochemical properties of metal oxides are very attractive and fascinating in general, making them a potential candidate for supercapacitor application. Vanadium oxide is of particular interest because it possesses a variety of valence states and is also cost effective with low toxicity and a wide voltage window. In the present study, vanadium oxide nanorods were synthesized using a modified sol–gel technique at low temperature. Surface morphology and crystallinity studies were carried out by using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy analysis. To the best of our knowledge, the as-prepared nanorods were tested with magnesium ion based polymer gel electrolyte for the first time. The prepared supercapacitor cell exhibits high capacitance values of the order of ~ 141.8 F g−1 with power density of ~ 2.3 kW kg−1 and energy density of ~ 19.1 Wh kg−1. The cells show excellent rate capability and good cycling stability.

Afiliacje autorów:
Jain A. - IPPT PAN
Manippady S. - IPPT PAN
Tang R. - inna afiliacja
Nishihara H. - inna afiliacja
Sobczak K. - inna afiliacja
Matejka V. - inna afiliacja
Michalska M. - Łukasiewicz Research Network‒Institute of Electronic Materials Technology (PL)
3.  Demchenko I.N., Melikhov Y., Walczak M.S., Ratajczak R., Sobczak K., Barcz A., Minikaev R., Dynowska E., Domagała J.Z., Chernyshova M., Syryanyy Y., Gavrilov N.V., Sawicki M., Effect of rapid thermal annealing on damage of silicon matrix implanted by low-energy rhenium ions, JOURNAL OF ALLOYS AND COMPOUNDS, ISSN: 0925-8388, DOI: 10.1016/j.jallcom.2020.156433, Vol.846, pp.156433-1-10, 2020

The structural, electronic, and magnetic properties of low-energy rhenium implanted c-Si are examined for the first time. The damage created by rhenium ions and the following partial reconstruction of the silicon host matrix after rapid thermal annealing (RTA) are investigated as a function of the fluence. Rutherford backscattering spectrometry (RBS) results reveal that the implanted ions are located in the near-surface region with the distribution maximum at about 23 nm below the surface. The analysis of rhenium-depth distribution using the McChasy code shows that the implanted Re-ions are located in the interstitial lattice positions. The RTA leads to a partial recovery of the silicon crystal structure. According to the RBS results, the formed inclusions are not coherent with the silicon host matrix causing an increase of the lattice distortion. Analysis of channeled RBS/c spectra carried out by the McChasy code revealed different levels of bent channels in damaged regions suggesting bimodal distribution of inclusions in the silicon. Studies of high-resolution X-ray photoelectron spectroscopy (XPS) conducted after the RTA showed the shift of Re 4f7/2 binding energy (BE) by +0.68 and + 0.85 eV with respect to metallic rhenium for the samples with lower/higher fluencies, respectively. Complex XPS, density functional theory (DFT) simulations, and transmission electron microscopy (TEM) data analysis allowed us to conclude that the near-surface layer of the sample (~10 nm) consists of nanoinclusions with cubic and/or hexagonal ReSi. In the middle area of the samples, much larger nanoinclusions (>10/20 nm for higher/lower fluencies, respectively) containing pure metallic rhenium inside are formed. The RTA increases the magnetic moment of the sample with the lower dose nearly 20-fold, whereas in the sample with the higher dose a 3-fold increment is observed only. The magnetic response of the examined systems after the RTA indicates a presence of magnetic interactions between the nanoinclusions resulting in the system exhibiting super-spin glass or super-ferromagnetism.

Słowa kluczowe:
rhenium-implanted silicon, RBS, XPS, RTA, TEM, DFT

Afiliacje autorów:
Demchenko I.N. - Institute of Physics, Polish Academy of Sciences (PL)
Melikhov Y. - IPPT PAN
Walczak M.S. - University of Manchester (GB)
Ratajczak R. - National Centre for Nuclear Research (PL)
Sobczak K. - inna afiliacja
Barcz A. - Institute of Physics, Polish Academy of Sciences (PL)
Minikaev R. - inna afiliacja
Dynowska E. - inna afiliacja
Domagała J.Z. - Institute of Physics, Polish Academy of Sciences (PL)
Chernyshova M. - Institute of Plasma Physics and Laser Microfusion (PL)
Syryanyy Y. - Institute of Physics, Polish Academy of Sciences (PL)
Gavrilov N.V. - inna afiliacja
Sawicki M. - inna afiliacja
4.  Baranowska-Korczyc A., Reszka A., Sobczak K., Sikora B., Dziawa P., Aleszkiewicz M., Kłopotowski Ł., Paszkowicz W., Dłużewski P., Kowalski B.J., Kowalewski T.A., Sawicki M., Elbaum D., Fronc K., Magnetic Fe doped ZnO nanofibers obtained by electrospinning, JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, ISSN: 0928-0707, DOI: 10.1007/s10971-011-2650-1, Vol.61, No.3, pp.494-500, 2012

Comprehensive studies of drug transport in nanofibres based mats have been performed to predict drug release kinetics. The paper presents our approach to analyze the impact of fibers arrangement, one of the parameters varied in our parallel experimental studies. Drug encapsulation in submicron fibers and subsequent controlled release of drugs is a tedious task due to the large number of process and material parameters involved. In the numerical study we constructed a 3D finite element geometry representing nanofibrous cubic element. COMSOL Multiphysics has been used to assess the impact of the various purposed arrangements of fibers within the mat. Drug release from nanofibers was modeled by adsorption -desorption and diffusion equation, where drug diffusion coefficient in the fluid between the fibers was altered depending on porosity of the material. Our study shows that for the same material porosity drug release from the matrix of regularly oriented fibers is slower than from randomly oriented, isotropic nanofibrous material. Also by decreasing distance between the fibers drug transport rate is reduced.

Słowa kluczowe:
Electrospinning, ZnO nanofibers, ZnFeO, Room temperature ferromagnetism, Magnetic oxides

Afiliacje autorów:
Baranowska-Korczyc A. - inna afiliacja
Reszka A. - inna afiliacja
Sobczak K. - inna afiliacja
Sikora B. - inna afiliacja
Dziawa P. - inna afiliacja
Aleszkiewicz M. - inna afiliacja
Kłopotowski Ł. - inna afiliacja
Paszkowicz W. - inna afiliacja
Dłużewski P. - inna afiliacja
Kowalski B.J. - inna afiliacja
Kowalewski T.A. - IPPT PAN
Sawicki M. - inna afiliacja
Elbaum D. - inna afiliacja
Fronc K. - inna afiliacja

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