Yazar "Kose, Dursun A." seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    Fabrication and characterization of magnesium and calcium trimesate complexes via ion-exchange and one-pot self-assembly reaction
    (Elsevier Science Bv, 2018) Ozer, Demet; Oztas, Nursen Altuntas; Kose, Dursun A.; Sahin, Onur
    Using two different synthesis methods, two diversified magnesium and calcium complexes were successfully prepared. When the ion exchange method was used, C9H14MgO11 center dot H2O and G(18)H(30)Ca(3)O(24) complexes were obtained. When the one-pot self-assembly reaction was used, C18H34Mg3O26 center dot 4H(2)O and C9H12CaO10 complexes were produced. The structural characterizations were performed by using X-ray diffraction, FT-IR and elemental analyses. Thermal behavior of complexes were also determined via TGA method. The both complexes of magnesium and calcium trimesate have micro and mesoporosity with low porosity because of hydrogen bonds. Then hydrogen storage capacities of complexes were also determined. The differences in synthesis method result in the differences on complexes structure, morphology (shape, particle size and specific surface area) and hydrogen storage capacities. (C) 2017 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Study of structural, surface and hydrogen storage properties of boric acid mediated metal (sodium)-organic frameworks
    (Elsevier, 2018) Ozer, Demet; Kose, Dursun A.; Sahin, Onur; Oztas, Nursen A.
    Three boric acid mediated metal organic frameworks were synthesized by solution method with using succinic acid, fumaric acid and acetylene dicarboxylic acid as a ligand source and sodium as a metal source. The complexes were characterized by FT-IR, powder XRD, elemental analyses and single crystal measurements. The complexes with the formula, C4H18B2Na2O14, C4H16B2Na2O14 and C4H14B2Na2O14 were successfully obtained. BET surface area of complexes were calculated and found as 13.474 m(2)/g for catena-(tetrakis(mu 2-hydroxo)-(mu 2-trihydrogen borate)-(mu 2-succinato)-di-sodium boric acid solvate), 1.692 m(2)/g for catena-(tetralds(mu 2-hydroxo)-(mu 2-trihydrogen borate)-(mu 2-fumarato)-di-sodium boric acid solvate) and 5.600 m(2)/g for catena-(tetrakis(mu 2-hydroxo)-(mu 2-trihydrogen borate)-(mu 2-acetylenedicarboxylato)-di-sodium boric acid solvate). Hydrogen storage capacities of the complexes were also studied at 77 K 1 bar pressure and found as 0.108%, 0.033%, 0.021% by mass. When different ligands were used, the pore volume, pore width and surface area of the obtained complexes were changed. As a consequence, hydrogen storage capacities also changed. (C) 2017 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Synthesis and characterization of boric acid mediated metal-organic frameworks based on trimesic acid and terephthalic acid
    (Elsevier Science Bv, 2017) Ozer, Demet; Kose, Dursun A.; Sahin, Onur; Oztas, Nursen Altuntas
    The new metal-organic framework materials based on boric acid reported herein. Sodium and boron containing metal-organic frameworks were synthesized by one-pot self-assembly reaction in the presence of trimesic acid and terephthalic acid in water/ethanol solution. Boric acid is a relatively cheap boron source and boric acid mediated metal-organic framework prepared mild conditions compared to the other boron source based metal-organic framework. The synthesized compounds were characterized by FT-IR, p-XRD, TGA/DTA, elemental analysis, C-13-MAS NMR, B-11-NMR and single crystal measurements. The molecular formulas of compounds were estimated as C18H33B2Na5O28 and C8H24B2Na2O17 according to the structural analysis. The obtained complexes were thermally stable. Surface properties of inorganic polymer complexes were investigated by BET analyses and hydrogen storage properties of compound were also calculated. (C) 2017 Elsevier B.V. All rights reserved.