There are two main approaches to synthesize nanomaterial or nanoparticle. One is top-down approach and another is the bottom-up approach.
Let us discuss these approaches one by one: Continue reading “Synthesis of nanomaterials: top-down and bottom-up approaches”
Definition of quantum dots: If all the three dimensions of a material are reduced to nano range, then the nanomaterial or the structure is called the quantum dot.
Preparation of quantum dots: Continue reading “Quantum Dots in nanotechnology”
Definition of quantum wire: If the two dimension of the material are reduced to nano range while the third dimension remains large, then the material or structure is called quantum wire. Quantum well is also called nanolayers.
Preparation of quantum wire: Continue reading “Quantum wire in nanotechnology”
Definition of quantum well: If one dimension of the material is reduced to nano range while the other two dimensions remain large, then the material or structure is called quantum well. Quantum well is also called nanolayers. Continue reading “Quantum well in nanotechnology”
Electron confinement or quantum confinement is another process that occurs in nanoparticles. We know that when atoms are isolated, then their energy levels are discrete but when they are in packed form and in large numbers (in solid form), the energy levels split and form bands (band means group of levels). Nanoparticles represents intermediate stage. Continue reading “Electron Confinement in nanoparticles”
Surface area to volume ratio in nanoparticles have a significant effect on the nanoparticles properties. Firstly, nanoparticles have a relative larger surface area when compared to the same volume of the material. For example, let us consider a sphere of radius r: Continue reading “Surface area to volume ratio in nanoparticles”
To answer the question that what is nanotechnology, let us first discuss nanoscale because nanotechnology is a science that deals with objects in nanoscale. Nano means 10-9 or one billionth. For example, nano meter means 10-9 meter. Therefore nanotechnology is the science that deals with the objects in size 1 nm. Sometimes the range is defined to 1 to 100 nm. Continue reading “What is Nanotechnology”