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AKTUALNOŚCI / NEWS

2013

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M. Bazarnik, J. Brede, R. Decker, R. Wiesedanger"Tailoring Molecular Self-Assembly of Magnetic Phthalocyanine Molecules on Fe- and Co-Intercalated Graphene"ACS Nan...

2014

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R. Decker, M. Bazarnik, N. Atodiresei, V. Caciuc, S. Blügel, R. Wiesendanger"Local tunnel magnetoresistance of an iron intercalated graphene-based heterostructure...

2015

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A. Racis, L. Jurczyszyn, M. Bazarnik, W. Koczorowski, A. Wykrota, R. Czajka, M.W. Radny"Self-organisation of inorganic elements on Si(001) mediated by pre-adsorbed...
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2013

  1. M. Bazarnik, J. Brede, R. Decker, R. Wiesedanger
    "Tailoring Molecular Self-Assembly of Magnetic Phthalocyanine Molecules on Fe- and Co-Intercalated Graphene"
    ACS Nano, 7 (2013) 11341-11349

    Abstract

     We investigate molecule–molecule, as well as molecule–substrate, interactions of phthalocyanine molecules deposited on graphene. In particular, we show how to tune the self-assembly of molecular lattices in two dimensions by intercalation of transition metals between graphene and Ir(111): modifying the surface potential of the graphene layer via intercalation leads to the formation of square, honeycomb, or Kagome lattices. Finally, we demonstrate that such surface induced molecular lattices are stable even at room temperature.
  2. G. Milczarek, M. Nowicki
    "Carbon nanotubes/kraft lignin composite: Characterization and charge storage properties"
    Materials Research Bulletin, 48 (2013) 4032-4038

    Abstract

    The results of this study demonstrate the spectral, microscopic and electrochemical properties of multi-walled carbon nanotubes (CNTs) surface-functionalized with kraft lignin (KL). XPS and FT-IR spectroscopy show that the biomolecule is effectively adsorbed on the surface of CNTs, leading to an increase in oxygen content and the appearance of spectral features characteristic of highly oxidized polyphenolic compounds. The presence of KL makes CNTs easily dispersible in organic (DMSO) and aqueous (0.1 M ammonia) solutions. Microscopic analysis (SEM and AFM) confirms the effective debundling of CNTs and the presence of densely packed globular structures on the surface of individual nanotubes. Deposition of the CNT/KL composite on the surface of a gold electrode facilitates its electrochemical characterization. This reveals that the CNT-supported biomolecule exhibits persistent reversible redox behavior attributed to KL-derived quinone moieties. Therefore the reversible redox activity of the lignin adsorbate can be utilized for charge storage, providing more than a 100% increase in the capacitance of KL-modified carbon nanotubes compared with unmodified ones.
  3. H. Kaczmarek, M. Nowicki, I. Vuković-Kwiatkowska, S. Nowakowska
    "Crosslinked blends of poly(lactic acid) and polyacrylates: AFM, DSC and XRD studies."
    J. Polym. Res., 20(91) (2013)

    Abstract

    The blends based on poly(lactic acid), (PLA) and polyacrylates (1:1 weight ratio) have been prepared by photopolymerization of three different multifunctional acrylate monomers (pentaerythritol triacrylate, pentaerythritol tetraacrylate and dipentaerythritol pentaacrylate) in matrix of linear PLA. The structure of these systems has been studied by Atomic Force Microscopy (AFM), Differential Scanning Calorimetry (DSC) and X-ray Diffraction (XRD). It was found that the blends are highly crosslinked, rough, heterogeneous and some of them – semicrystalline. The effect of UV-irradiation on surface morphology of obtained mixtures was studied. The viscometry has been applied for measurements of changes of PLA molecular weight resulting of photodegradation. It was shown that blends are much more photostable than pure PLA.
  4. P. Wojciechowska, Z. Foltynowicz, M. Nowicki
    "Synthesis and Characterization of Modified Cellulose Acetate Propionate Nanocomposites via Sol-Gel Process"
    Journal of Spectroscopy, 2013 (2013)

    Abstract

    In this study novel organic-inorganic hybrid nanocomposites were synthesized from modified cellulose acetate propionate (MCAP) via sol-gel reaction at ambient temperature. The inorganic phase was introduced in situ by hydrolysis-condensation of tetraethoxysilane (TEOS) in different concentrations, under acid catalysis, in the presence of organic polymer dissolved in acetone. The chemical modification of CAP was monitored by infrared spectroscopy (IR). The nanocomposites structure was characterized by IR analysis and solid state 29Si NMR studies. The spectral data revealed that organic and inorganic phases are linked through covalent bound. Surface morphology of the samples and the degree of dispersion of inorganic phase in the polymer matrix were investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The actual incorporation of the inorganic component into the hybrid nanocomposites was deducted from the residual weight according to thermogravimetric analysis (TGA).
  5. M. Matczak, B. Szymański, M. Urbaniak, M. Nowicki, H. Głowiński, P. Kuświk, M. Schmidt, J. Aleksiejew, J. Dubowik, F. Stobiecki
    "Antiferromagnetic magnetostatic coupling in Co/Au/Co films with perpendicular anisotropy"
    Journal of Applied Physics, 114 (2013) 093911

    Abstract

    Magnetization reversal processes in Au/Co/Au-wedge/Co/Au pseudo-spin-valve structures characterized by perpendicular anisotropy of 0.6-nm-thick Co layers were investigated by magneto-optical Kerr effect. The samples were deposited on a Ti/Au buffer layer of differing Au-layer thickness (different surface roughness and crystallite size). The distinctive influence of the buffer layer thickness on the dependences of switching fields, and energy of the effective interlayer coupling, versus Au spacer thickness is presented. In particular, increasing the buffer-layer thickness results in a decrease in the oscillation amplitude of the Ruderman–Kittel–Kasuya–Yosida-type interaction and in the enhancement of the antiferromagnetic coupling related to magnetostatic (orange peel) interactions.
  6. P. Wojciechowska, Z. Foltynowicz, M. Nowicki
    "Cellulose acetate butyrate nanocomposites synthesized via sol-gel method"
    Polimery, 58(7-8) (2013) 543-549

    Abstract

    Novel hybrid nanocomposites were synthesized from modified cellulose acetate butyrate (MCAB) via sol-gel reaction at ambient temperature. The inorganic phase was introduced in situ by hydrolysis-condensation of tetraethoxysilane (TEOS) in different concentrations, using an acid catalyst, in the presence of organic polymer dissolved in acetone. Infrared spectroscopy (IR) was used to monitor modification of CAB and nanocomposites characterization. The silica network of obtained nanocomposites was characterized by solid state Si NMR. Morphology of the samples and degree of dispersion of inorganic phase in the polymer matrix were investigated using atomic force microscopy (AFM). The organic-inorganic nanocomposites exhibit better mechanical properties than unmodified cellulose acetate butyrate