Journal of Membrane Science & Technology

Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt

Biography

He has done BSc & MSc from the Chemistry Department, Faculty of Science, Assiut University in 1970 and 1973, respectively. and appointed as Assistant Lecturer of Chemistry and got a Japanese Scholarship at Tokyo Institute of Technology in April 1975. After, That he returned back to Egypt and appointed as an Assistant Professor. In1988, he get promotion for the Associate Professor and in 1993 for a full Professor of Physical Chemistry &Materials Science up till now.

Publications

• Research Article   
  Diffusion Control Factors Influenced the Ion Exchange between Sodium Counter Ions of Alginate and some Trivalent Metal Cations in the Sol-Gel Transition Process
  Author(s): Refat M Hassan*
  
  The influence of diffusion controls on the rate of gel growth forming coordination biopolymer ionotropic spherical hydrogels resulting from ion exchange process of Na+ counter ions in alginate macromolecular chains by trivalent metal ions such as lanthanum (III)- and cerium (III) electrolyte solutions have been studied. The experimental observations indicated that the ion exchange processes in such sol-gel transformation were inherently stoichiometric processes. The influence of the nature of metal ion concentration of both alginate sol and metal ion electrolytes and temperature as well as the coordination geometry of the complexes formed have been examined. A mathematical approach of such factors which affect the gelation processes such as the mass, density and the radius of droplets of both alginate sol and formed metal-alginate hydrogels has been suggested. A tentative gelation mec.. View more»
  

  Abstract HTML PDF