Starts 20 Sep 2022 15:00
Ends 20 Sep 2022 16:00
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CMSP Seminar: Size effects in nanoscaled systems & computational optimization
Hybrid Seminiar
Room D (Leonardo Bld. terrace level) + Zoom
Malik Maaza
UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, Pretoria-South Africa
Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, South Africa
UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, University of South Africa, Pretoria-South Africa
Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, South Africa
Abstract:
It is well established that matter at the nanoscale exhibits several size effects governed by size, shape, or surface to volume ratio as well as by the breaking of the 3-D symmetry and spatial confinement. Preliminary DFT based theoretical & modelling treatments are pivotal in allowing the identification of the optimal conditions. This contribution reports on Quantum Mechanic governed phenomena at room temperature in several nano-scaled systems. Due to the relativistic contraction in connection to the Dirac dynamics of the valence electrons of Mercury, this later is shown to be solid at room temperature for Nanoparticles of mercury with size below 5 nm in Ø. Owing to their large longitudinal to transversal anisotropy ratio & their multi-electronic properties, Carbon Nano-tubes are ideal nano-systems to localize light and hence to observe the Anderson Localization at room temperature. Likewise, due to the wave-particle duality, it is demonstrated that cold neutron wave-matter wave-packets can be trapped in the equivalent of Nano-scaled Fabry-Perot nano-resonators. Last but not least, Lycopene, a conjugated natural molecule is shown to exhibit an enhanced third order optical nonlinearity; the highest value relatively to any natural carotenoid.
It is well established that matter at the nanoscale exhibits several size effects governed by size, shape, or surface to volume ratio as well as by the breaking of the 3-D symmetry and spatial confinement. Preliminary DFT based theoretical & modelling treatments are pivotal in allowing the identification of the optimal conditions. This contribution reports on Quantum Mechanic governed phenomena at room temperature in several nano-scaled systems. Due to the relativistic contraction in connection to the Dirac dynamics of the valence electrons of Mercury, this later is shown to be solid at room temperature for Nanoparticles of mercury with size below 5 nm in Ø. Owing to their large longitudinal to transversal anisotropy ratio & their multi-electronic properties, Carbon Nano-tubes are ideal nano-systems to localize light and hence to observe the Anderson Localization at room temperature. Likewise, due to the wave-particle duality, it is demonstrated that cold neutron wave-matter wave-packets can be trapped in the equivalent of Nano-scaled Fabry-Perot nano-resonators. Last but not least, Lycopene, a conjugated natural molecule is shown to exhibit an enhanced third order optical nonlinearity; the highest value relatively to any natural carotenoid.