Dextran-coated iron oxide nanoparticles (DIONPs) with appropriate surface chemistry exhibit many interesting properties that can be exploited in a variety of biomedical applications such as magnetic resonance imaging (MRI) contrast enhancement, tissue repair, hyperthermia, drug delivery and in cell separation. This paper reports the experimental detail for preparation, characterization and investigation of thermal and dynamical mechanical characteristics of the dextran-coated FeO magnetic nanoparticles. In our work, DIONPs were prepared in a 1:2 ratio of Fe(II) and Fe(III) salt in the HCl solution with NaOH at given temperature. The obtained dextran-coated iron-oxide nanoparticles structure-property correlation was characterized by spectroscopic methods; attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and XRD. Coating dextran on the iron-oxide proof of important peaks can be seen from the ATR-FTIR. Dramatic crystallinity increment can be observed from the XRD pattern of the iron-oxide dextran nanoparticles. The thermal analysis was examined by differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA) and differential thermal analysis (DTA). Dynamical mechanical properties of dextran nanoparticles were analysed by dynamic mechanical analysis (DMA). Thermal stability of the iron oxide dextran nanoparticles is higher than that of the dextran.
ABSTRACT:The chelation of poly(maleic anhydride-altacrylic acid) [poly(MA-alt-AA)] with nickel (II), cadmium (II), and copper (II) ions was carried out under various pH conditions. Polychelates were prepared by precipitation from the aqueous solutions of metal salts at different pH values. The effects of metal salts (NiCl 2 ⅐6H 2 O, CdCl 2 ⅐2H 2 O, CuCl 2 ⅐2H 2 O) on the degree of crystallinity of poly(MA-alt-AA) were investigated by X-ray diffraction spectroscopy at different pH values. The degree of crystallinity was found to be in the following order: Cd(II)-polychelate Ͼ Cu(II)-polychelate Ͼ Ni(II)-polychelate at pH 6.36; this result was also supported by gravimetric studies.
ABSTRACT:Interactions between poly(maleic anhydridealt-acrylic acid), [poly(MA-alt-AA)] and Cu 2ϩ , Ni 2ϩ , and Cd 2ϩ ions were studied by UV-vis spectroscopy and viscosimetry. Effects of nature and the concentrations of the metal ions on the complex formation were investigated and the formation constants of each complex were determined by the mole-ratio method. UV-vis studies showed that the complex formation tendency increased in the followed order: Cd(II) Ͻ Ni(II) Ͻ Cu(II). This order was confirmed by the Irving-William series and the Pearson's classification. The influence of metal ions on the reduced viscosity of poly(MAalt-AA) increased in the following order: Cu(II) Ͻ Ni(II) Ͻ Cd(II), and this result was explained by the concentration effect.
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