Researcher:
Shawuti, Shalima

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Shalima

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Shawuti

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Shawuti, Shalima

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2022 - 20232

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Researcher Of Publications: search.filters.isAuthorOfPublication.6ba2d45f-b588-494b-9d55-8bd0dbb9db6a

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    Blue shift in optical emission spectra of ZnGa2O4 by lattice deformation due to Eu atom amount in spinel lattice
    (Springer, 2022) Can, Musa Mutlu; Akbaba, Yesim; Kaneko, Satoru; Shawuti, Shalima; Researcher; N/A; N/A
    We investigated the structural and electronic energy configurations of the spinel oxide ZnGa2O4 lattice according to the crystal-phase fractions originating from substituted Eu atoms. Rietveld refinements were employed to determine the crystal structure of Eu-doped ZnGa2O4. Rietveld refinements were based on assumption of simultaneously formed three crystal phases in the normal spinel ZnGa2O4. Pure ZnGa2O4, ZnGa2O4 with Eu atoms in tetrahedral sites, and ZnGa2O4 with Eu atoms in octahedral sites were the proposed phases randomly distributed through all spinel structure. Eu atom positions in the spinel lattice were readjusted the "a" parameters from 8.3363 +/- 0001 angstrom (for pure ZnGa2O4) to 8.3227 +/- 0001 angstrom (for Eu atoms in tetrahedral sides) and 8.3393 +/- 0001 angstrom (for Eu atoms in octahedral sites). Furthermore, the consequences of replacement of Eu+3 ions in octahedral side and Eu+2 ions in tetrahedral side were monitored by lowering optical emission intensity and blue shift at optical emission spectra. The blue shift was indicated by an increase in the band gap values from 4.69 +/- 0.01 eV to 4.92 +/- 0.01 eV.
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    Anticancer drug doxorubicin (DOX) loading performance of functionalized polyaniline (PANI) surface with active carbon
    (Springer, 2023) Can, Musa Mutlu; Kalındemirtas, Ferdane Danışman; Erdemir, Gökce; Kuruca, Dürdane Serap; Kaneko, Satoru; Aktas, Zerrin; Oncul, Oral; N/A; Shawuti, Shalima; Researcher; N/A; N/A
    The study was based on surface functionalization of conductive PANI (polyaniline) polymer for drug delivery systems. Specifically, an electrochemical polymerization technique was performed for the synthesis of PANI layers on tin-doped indium oxide (In2O3:Sn or ITO)-coated PET (polyethylene terephthalate) substrates. Three main factors were studied: binding ability, drug-loading ability and drug-delivering ability. PANI layers, combined with active carbon (AC), were organized as biomaterials to carry the anticancer drug doxorubicin (DOX). Two different films, PANI and PANI with AC, were polymerized in the emeraldine salt form of PANI. A comparison of the two samples proved that AC molecules enabled DOX molecules to bind to the PANI surface, as observed by the UV-Vis absorption spectra of the films. DOX molecules were detected by UV-Vis spectra with an absorption peak at 547 nm. Findings from drug loading/release tests and in vitro cytotoxicity results confirm that these films can be used as drug delivery systems. This work underlines essential role of AC in the PANI layer for drug delivery.