Alginic acid, a new thin layer material

Cozzi, D.; Desideri, Pier Giorgio; Lepri, Luciano; Ciantelli, Giuliano

doi:10.1016/s0021-9673(01)82401-8

Cited by 33 publications

(20 citation statements)

References 10 publications

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“…Relevant infrared bands which provide considerable structural evidence for the mode of attachment between these trivalent metal cations and alginate functional groups are shown in Figure 1. The vibrational assignments of the bands showed that the bands of υ s CO 2 -and υ as CO 2 -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].…”

Section: Resultsmentioning

confidence: 97%

“…Divalent [26] and hexavalent [27] metal cations are known to be of octahedral six coordination geometry in their complexes and, hence, tend to chelate the functional groups via either inter-or intramolecular association in order to attain the octahedral geometry in their complexes as shown in Schemes I and II. The priority of these two geometrical structures depends on the stability of the complexes formed.…”

Section: I Iiimentioning

confidence: 99%

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Temperature-Dependence of Electrical Conductivity for Some Natural Coordination Polymeric Biomaterials Especially Some Cross-Linked Trivalent Metal-Alginate Complexes with Correlation between the Coordination Geometry and Complex Stability

Zaafarany¹

2015

J Adv Chem Eng

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The electrical conductivity (ơ) 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 ơ 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 ơ 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. Journal of Advanced Chemical Engineering

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Section: Resultsmentioning

confidence: 97%

Section: I Iiimentioning

confidence: 99%

Temperature-Dependence of Electrical Conductivity for Some Natural Coordination Polymeric Biomaterials Especially Some Cross-Linked Trivalent Metal-Alginate Complexes with Correlation between the Coordination Geometry and Complex Stability

Zaafarany¹

2015

J Adv Chem Eng

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“…Pertinent bands of infrared that have delivered a substantial structural indication for the attachment mode amid these tetravalent metal cations and alginate functional groups are shown in Fig The vibrational assignments of the bands showed that the bands of υ s -CO 2-and υ as -CO 2-are relocated from 1600 and 1400 cm -1 in alginate to higher frequencies of 1605 and 1428 cm-1 in the complexes indicating the barriers amid the hydroxyl and carboxylate functional groups of alginate macromolecular chains and inter-diffused Ce 4+ ions (Bellamy,1966;Cozzi et al,1968). The observation of broadband at around 3500 cm -1 , which belongs to υ OH of water (or OH-free functional groups), is also shifted to lower frequencies of 3477 cm -1 as shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Electrical Conductivity and Chemical Equilibria of Coordination Biopolymeric Cerium (IV)-Alginate Complex with Correlation between the Structure and Complex Stability

Zaafarany¹,

Altass²,

Al‐Fahemi³

et al. 2015

IJC

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In this research study, the cross-linked cerium (IV)-alginate complex, as coordination biopolymeric compound in the granules form, was prepared. It has been indicated from the x-ray diffraction patterns that the nature of alginate complex is amorphous. Additionally, it has been revealed from the infrared absorption spectra that cerium (IV) chelates the alginate macromolecular chains in the complex. The study has displayed that the range of  s OCO-is 1424 cm -1 and the range of  a s OCO-is 1605 cm -1. This indicates that a complexation type between the cation Ce 4+ and both carboxylate and hydroxyl functional groups of alginate macromolecule is usually takes place. The study has also measured the electrical conductivity () of coordination biopolymeric cerium (IV)-alginate complex, as function of temperature. It has been indicated from the measured value of the electrical conductivity, i.e., 1.04 x10-9 Siemens at 20 o C that the conductance of the complex lies in the range of semiconductors. The research has profoundly discussed with evaluation of the thermodynamic parameters. Afterwards, appropriate conduction mechanism based on the electrical conductivity and chemical equilibrium has also been suggested and discussed in terms of the complex stability in correlation with its coordination geometry.

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“…19 iii) The third measured the relative rate of migration of the metal ion to the aqueous solvent front during thin-layer chromatography through a film of AA. 20 There is a growing body of research aimed at defining the structure of and the mechanism of crosslinking in alginate hydrogels. 1 The mechanism of crosslinking is the coordination of carboxylic acids and hydroxyl groups on the polymer to the metal ions.…”

Section: Structure Of Aa Hydrogelsmentioning

confidence: 99%

Fabrication and Manipulation of Ionotropic Hydrogels Cross-Linked by Paramagnetic Ions

et al. 2007

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This manuscript describes the fabrication and manipulation of millimeter-scale spheres fabricated from ionotropic hydrogels that are crosslinked with paramagnetic metal ions (e.g., Ho 3+ ). These ionotropic hydrogels experience a force in a magnetic field gradient that correlates with the concentration of the paramagnetic cations crosslinking the polymer. In an externally applied magnetic field, the paramagnetic hydrogel spheres assemble into ordered arrays or confined geometrical structures in the regions of highest magnetic field. These spheres can be separated from heterogeneous mixtures of diamagnetic materials using a simple bar magnet. Two applications using these recoverable hydrogel spheres were demonstrated: i) When prepared with embedded indicator dyes bound to paper, the spheres were used as colorimetric sensors for pH. ii) When prepared with embedded activated carbon powder, they were used to remove organic materials from aqueous solutions.

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Alginic acid, a new thin layer material

Cited by 33 publications

References 10 publications

Temperature-Dependence of Electrical Conductivity for Some Natural Coordination Polymeric Biomaterials Especially Some Cross-Linked Trivalent Metal-Alginate Complexes with Correlation between the Coordination Geometry and Complex Stability

Temperature-Dependence of Electrical Conductivity for Some Natural Coordination Polymeric Biomaterials Especially Some Cross-Linked Trivalent Metal-Alginate Complexes with Correlation between the Coordination Geometry and Complex Stability

Electrical Conductivity and Chemical Equilibria of Coordination Biopolymeric Cerium (IV)-Alginate Complex with Correlation between the Structure and Complex Stability

Fabrication and Manipulation of Ionotropic Hydrogels Cross-Linked by Paramagnetic Ions

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