Abstract
The electrical conductivity (AEi) of cross-linked arsenic (III) - alginate complex as a coordination polymeric biomaterial in the form of circular discs have been measured as a function of temperature. The measured values of the electrical conductivity were found to be in the range of semiconductors. The change of electrical conductivity as a function of temperature was found to be of considerable complexity (Arrhenius plot of ln AEi vs. 1/T ). The appearance of a parabola zone at the early stages was explained by the release of waters of crystalline, whereas the sharp increase in AEi values observed at the elevated temperatures was interpreted by the degradation process of the complex to give rise to the metal oxide as final product. The X-ray diffraction patterns indicated that the metalalginate complex is amorphous in nature. Infrared absorption spectra revealed a sort of complexation between the trivalent metal cations and the functional carboxylate and hydroxyl groups of alginate macromolecule. A suitable conduction mechanism in terms of the complex stability in relation to the coordination geometry is suggested and discussed.
Highlights
Alginate is a binary linear heteropolymer consisting of 1,4- linked β-D-mannuronic and α-L- guluronic acids units
Cross-linked trivalent metal-alginate complexes are formed when the Na+ counter ions of alginate macromolecule are replaced by an equivalent amount of quadrivalent metal cations
The vibrational assignments of the bands showed that the bands of υsCO2- and υasCO2- are shifted from 1600 and 1400 cm-1 in alginate to higher frequencies in the complexes, indicating the complexation between the interdiffused metal cations and the carboxylate and hydroxyl functional groups of alginate macromolecular chains [25,26]
Summary
Alginate is a binary linear heteropolymer consisting of 1,4- linked β-D-mannuronic and α-L- guluronic acids units. Conducting polymers in that prepared from synthetic polymeric materials have been the subject of continuous research and development in recent years owing to their unique electrical, optical and chemical properties [8], a little attention has been focused to that of natural polymers such as the coordination polymeric biomaterials such as cross-linked metal-alginate complexes. This fact may be attributed to a lack of information on the electrical properties of such natural polysaccharide complexes.
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