Example optical properties of nanomaterials
Answers
Answered by
0
1) The properties like colour and transparency are considered as optical properties. These properties are observed to change at nanoscale level. For example bulk gold appear yellow in colour while in nanosize gold appear red in colour.
2.) Bulk silicon appears grey in colour while nanosized silicon appears red in colour. 3.) Zinc oxide, which at bulk scale blocks ultraviolet light and scatters visible light and gives white appearance. While nanoscale zinc oxide is very small in particle size compared with wavelength of visible light and it does not scatters it. Thus it appears transparent.
Reason for change in optical properties in nanoscale
1.) The main reason for change in optical properties at nanoscale level is that nanoparticles are so small that electrons in them are not as much free to move as in case of bulk material. Due to this restricted movement of electrons, nanoparticles react differently with light as compared to bulk material.
2.) Bulk silicon appears grey in colour while nanosized silicon appears red in colour. 3.) Zinc oxide, which at bulk scale blocks ultraviolet light and scatters visible light and gives white appearance. While nanoscale zinc oxide is very small in particle size compared with wavelength of visible light and it does not scatters it. Thus it appears transparent.
Reason for change in optical properties in nanoscale
1.) The main reason for change in optical properties at nanoscale level is that nanoparticles are so small that electrons in them are not as much free to move as in case of bulk material. Due to this restricted movement of electrons, nanoparticles react differently with light as compared to bulk material.
Similar questions