Summary
Sodium alginate sol can be converted into ionotropic gels by diffusion of di/or trivalent metal ions. The kinetics of this phase transition is studied by two different methods. It is found that the rate of gel membrane formation at the earlier stages is greater than that of the further gel growth. The kinetic studies of gel formation in the presence of a mixture of Cu2+ ions with either Co2+ or Ni2+ ions show that the exhaust of Co2+ and Ni2- ions is remarkable only at the first stage of gel formation. Meanwhile the Cu2+ ions continue exchanging all the time with Na2+ ions in the alginate sol. The activation energy of gel formation is found to range between 17–23 kJ mol−, indicating the diffusion control of the process.
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References
Fischer, G. F., H. Dorfel, Z. Physik Chem.301, 224 (1955), Z. Physik Chem.302, 186 (1955).
Thiele, H., Z. Naturforschung36, 778 (1948).
Thiele, H., Koll. Z.136, 80 (1954).
Thiele, H., H. Micke, Koll. Z. III, 73 (1948).
Thiele, H., L. Langmaack, Natur. Wissensch.43, 56 (1956); Z. Physik Chem.206, 394 (1956).
Thiele, H., Kienast, Koll. Z.127, 134 (1952).
Thiele, H., K. Hallich, Koll. Z.36, 44 (1957).
Awad, A., F. EI-Cheikh, R. Hassan, Revue Romaine De Chimie.24, 563 (1979).
The First Chemical conference in Assiut university held in the memory of the lateProf. Dr. I. M. Issa (Assiut 1979).
Awad, A., Dissertation, Kiel, Christian-Albrecht Universität (1967)
Schwarzenbach, G., Komplexometrische Bestimmungsmethoden mit Titriplex, zweite Auflage, E. Merck A.G., Darmstadt (1900).
Brewer, I., E. Brackett, Chem. Rev.61, 425 (1961).
Kettle, S. F. A., in: CO-ordination compounds, The English language book, Society Nelson, 48 (1975).
Gerosimov, Y. A., Physical Chemistry (Moscow 1974).
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Awad, A., El-Cheikh, F. & Shaker, A. Kinetic studies of cobalt alginate gels. Colloid & Polymer Sci 258, 1244–1249 (1980). https://doi.org/10.1007/BF01668770
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DOI: https://doi.org/10.1007/BF01668770