Variation of surface properties and textural features of spinel ZnAl2O4 and perovskite LaMnO3 nanoparticles prepared via CTAB-butanol-octane-nitrate salt microemulsions in the reverse and bicontinuous states
Loading...
Date
Authors
Giannakas, A. E.
Vaimakis, T. C.
Ladavos, A. K.
Trikalitis, P. N.
Pomonis, P. J.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Type
Type of the conference item
Journal type
peer reviewed
Educational material type
Conference Name
Journal name
J Colloid Interface Sci
Book name
Book series
Book edition
Alternative title / Subtitle
Description
Two binary oxides, a spinel, ZnAl2O4, and a typical perovskite, LaMnO3, have been prepared via CTAB-1-butanol-n-octane-nitrate salt microemulsion in the reverse and bicontinuous states. The exact point of the reverse and bicontinuous states of the microemulsion used in the synthesis was determined by conductivity experiments. The materials obtained after heating at 800 degreesC were characterized by XRD analysis for their crystal structure, N-2 porosimetry for their surface area and porosity, and SEM and TEM photography for their texture. The ZnAl2O4 spinel obtained via the reverse microemulsion appears in SEM in a more fragmented form and with a higher specific surface area (143.7 m(2) g(-1)), compared to the corresponding solid prepared via the bicontinuous microemulsion, which appears more robust with lower surface area (126.7 m(2) g(-1)). Nevertheless both materials reveal in TEM a sponge-like structure. The perovskite materials LaMnO3 prepared via the reverse microemulsion showed in SEM a peculiar doughnut-like texture, each doughnut-like secondary particle having a diameter of 2 put. The corresponding sample developed via the bicontinuous microemulsion showed in SEM uniform secondary particles of size similar to0.2 mum. Both perovskite samples LaMnO3 appear well crystallized with relative low surface areas, 23.7 m(2) g(-1) for the reverse sample and 10.9 m(2) g(-1) for the bicontinuous one. The TEM photographs reveal that both of them, of reversed and bicontinuous origin, are made up of primary nanoparticles in the size range 40-100 nm. In SEM those materials showed a different secondary structure. (C) 2003 Elsevier Science (USA). All rights reserved.
Description
Keywords
microemulsion, reverse microemulsion, bicontinuous microemulsion, spinel znal2o4, perovskite lamno3, in-oil microemulsions, high-coercivity, micelles, powders
Subject classification
Citation
Link
<Go to ISI>://000182019800005
http://ac.els-cdn.com/S0021979702000681/1-s2.0-S0021979702000681-main.pdf?_tid=5ba05dcb5b7361f2bfd1958b9e039af5&acdnat=1333113664_4aa1663a34713c0abfeb3f98665eb628
http://ac.els-cdn.com/S0021979702000681/1-s2.0-S0021979702000681-main.pdf?_tid=5ba05dcb5b7361f2bfd1958b9e039af5&acdnat=1333113664_4aa1663a34713c0abfeb3f98665eb628
Language
en
Publishing department/division
Advisor name
Examining committee
General Description / Additional Comments
Institution and School/Department of submitter
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας