Effect of composition on the conductivity of CTAB-butanol-octane-nitrate salts (Al(NO3)(3) + Zn(NO3)(2)) microemulsions and on the surface and textural properties of resulting spinels ZnAl2O4
Φόρτωση...
Ημερομηνία
Συγγραφείς
Giannakas, A. E.
Ladavos, A. K.
Armatas, G. S.
Petrakis, D. E.
Pomonis, P. J.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Applied Surface Science
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
The conductivity a of a microemulsion series consisting of CTAB + butanol + octane, in which a solution of Al(NO3)(3) 0.8 M + Zn(NO3)(2) 0.4 M was gradually added, was studied at room temperature as a function of its composition phi. The addition of nitrate salts solution took place in four different ratios of (butanol + CTAB):octane = 0.2, 0.4, 0.6 and 0.8. Initially, all those four systems are (water in oil, w/o) microemulsions and the gradual addition of the solution of the nitrate salts transforms them to bicontinuous ones. The conductivity increases gradually, but with different rate in each case, and the corresponding critical exponents at the percolation threshold were determined from the curves sigma = f (phi). Next at three different compositions of microemulsions, corresponding to ratios (butanol + CTAB):octane = 0.4, 0.6 and 0.8 and ratio of the nitrate salts solution x approximate to 0.25, spinels ZnAl2O4 were isolated/prepared. XRD, SEM and N-2 adsorption-desorption measurements were used to determine the structure and texture of those solids. From those measurements the surface area (S-p), the pore volume (V-p), the size of crystallites and the average pore connectivity (c) were found. Those properties showed considerable variation and dependence on the composition of the original microemulsions employed in the preparation, a fact indicating that the structure and texture of the obtained solids can be manipulated at will via the composition of microemulsion used. (c) 2005 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
microemulsion, conductivity, spinels znal2o4, in-oil microemulsions, nitrogen sorption measurements, porous solids, transport-properties, percolation, nanoparticles, connectivity, systems, media, cosurfactant
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000234964500009
http://ac.els-cdn.com/S0169433205006884/1-s2.0-S0169433205006884-main.pdf?_tid=e2e9b140da99d6b03a314bd5dd6dad4e&acdnat=1333035492_7fe3afbd1598c4a563200d91dcb6811f
http://ac.els-cdn.com/S0169433205006884/1-s2.0-S0169433205006884-main.pdf?_tid=e2e9b140da99d6b03a314bd5dd6dad4e&acdnat=1333035492_7fe3afbd1598c4a563200d91dcb6811f
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας