ASP Online Seminars: TUNABILITY OF THE PHYSICAL PROPERTIES AT THE NANOSCALE OF OXIDES

by Prof. Malik Maaza (iThemba LABS & UNISA)

Tuesday 18 Aug 2020, 14:30 → 16:00 Africa/Abidjan

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https://cern.zoom.us/j/95193567359?pwd=TzdPQWsyWXlSTy9RNXFoa1FhL2xqQT09

Meeting ID: 951 9356 7359

Prof. Malik Maaza

Affiliations:

1) Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province, South Africa
2) UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, PO Box 392, Muchleuneuck, College of Graduate Studies, University of South Africa, Pretoria-South Africa

Abstract

•The significance of metal oxides resides in their variety, their chemical stability, and their diverse chemical as well as their physical properties. Metal oxides display rich properties ranging from piezoelectricity, multiferroicity to super-conductivity, from negative thermal expansion to super-ionic conductivity. Yet, Metal oxides are in general multifunctional but lack in term of tenability except some. This seminar contribution exemplifies that it is possible to optically tune reversibly some physical properties of several nano-scaled oxides such as ZnO (Surface tension), α-Cr2O3 (Photo induced Magnetism), and VO2 ( Photo-induced optical dispersion).
•In addition, we report on the possibility of Green biosynthesis of high quality functional oxides nanoparticles using the bioactive compounds within natural extracts as chelating agents in replacement of standard oxido-reduction acids/bases [2-3].

[1] Functional nanostructured oxides, Vacuum (2015) 1-16. M. Maaza, & al.
[2] Thermally tunable optical constants of VO2 …, Optics Communications 284 (3), 807-812 (2011), JBK Kana, M Maaza & al.
[3] ZnO nanoparticles via Moringa oleifera Green synthesis: physical properties & mechanism of formation, Applied Surface Science 406, 339-347(2017), N Matinise, M Maaza & al.
[4] Green synthesis of Co3O4 nanoparticles via Aspalathus linearis: Physical properties, Green Chemistry Letters and Reviews 8 (3-4), 30-36(2015), A Diallo, M Maaza & al.
[5] Green synthesis of NiO nanoparticles using Moringa oleifera extract & their biomedicalapplications: Cytotoxicity effect of nanoparticles against HT-29 cancer cells, Journal of Photochemistry & Photobiology B: Biology 164, 352-360 (2016), AA Ezhilarasi, M Maaza & al.
[6]Green synthesis of ZnO nanoparticles via Agathosma betulina natural extract
Materials Letters 161, 124-127 (2015), FT Thema, M Maaza&al.
[7]Single-phase α-Cr2O3 nanoparticles’ Green biosynthesis using Callistemon viminalis’ red flower extract, Green Chemistry Letters and Reviews 9 (2), 85-90 (2016), BT Sone, M Maaza & al
[8] RuO2 nanoparticles by a novel green process via Aspalathus linearis natural extract & their H2O

splitting response, Journal of Alloys and Compounds 662, 283-289 (2016), E Ismail, M Maaza & al.

ABSTRACT-22020-ASP LECTURES- .pdf

ASP_0818_Maaza_ Nanosciences.mp4

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MalikMaazaASPTALK-3.pdf

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