OSLO – The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Chemistry 2023 to three US scientists “for the discovery and synthesis of quantum dots”.
Moungi G. Bawendi, who is associated with Massachusetts Institute of Technology (MIT), Cambridge, MA, USA, Louis E. Brus from Columbia University, New York, NY, USA and Alexei I. Ekimov from Nanocrystals Technology Inc., New York, NY, USA, have been awarded with the prestigious award.
The Nobel Prize in Chemistry 2023 rewards the discovery and development of quantum dots, nanoparticles so tiny that their size determines their properties. These smallest components of nanotechnology now spread their light from televisions and LED lamps, and can also guide surgeons when they remove tumour tissue, among many other things.
The Nobel Laureates in Chemistry 2023 have succeeded in producing particles so small that their properties are determined by quantum phenomena. The particles, which are called quantum dots, are now of great importance in nanotechnology.
“Quantum dots have many fascinating and unusual properties. Importantly, they have different colours depending on their size,” says Johan Åqvist, Chair of the Nobel Committee for Chemistry.
Physicists had long known that in theory size-dependent quantum effects could arise in nanoparticles, but at that time it was almost impossible to sculpt in nanodimensions. Therefore, few people believed that this knowledge would be put to practical use.
However, in the early 1980s, Alexei Ekimov succeeded in creating size-dependent quantum effects in coloured glass. The colour came from nanoparticles of copper chloride and Ekimov demonstrated that the particle size affected the colour of the glass via quantum effects.
A few years later, Louis Brus was the first scientist in the world to prove size-dependent quantum effects in particles floating freely in a fluid.
In 1993, Moungi Bawendi revolutionised the chemical production of quantum dots, resulting in almost perfect particles. This high quality was necessary for them to be utilised in applications.
Quantum dots now illuminate computer monitors and television screens based on QLED technology. They also add nuance to the light of some LED lamps, and biochemists and doctors use them to map biological tissue.
Pakistani rupee remains stable against US dollar in the open market on February 25, 2024 (Sunday).
In the open market, the US dollar was being quoted at 279.5 for buying and 282.55 for selling.
Euro currently stands at 302 for buying and 305 for selling while British Pound rate stands at 352.5 for buying, and 356 for selling.
UAE Dirham AED hovers at 76.1 whereas the Saudi Riyal saw slight increase, with new rates at 74.35.
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