Isthe property of nano crystal vary from ordinary crystal? Suppose varied why?
Obviously nano crystal vary from ordinary crystal due to their small size,
with decrease in small size different property like thermal conductivity increases.also the colour,order changes.
There are critical diameters related to different properties (for example magnetic property). If the size of nanoparticles decrease to less than these critical diameters their related properties will change.
Nanotech is study of matter in small scale (1-100 nm). In that range particles follow the quantum mechanism and above this range its follow conventional physics.
Crystal growth- Crystals with different morphologies and sizes can be obtained by changing the growth conditions. The procedure of crystal growth can be conveniently used for mass production of crystals.
In general, ordinary crystals vary their morphologies, structures, for example, liquid crystals are divided into two classes: lyotropic (Greek: freeze-dilution tropos-form) and thermotropic (thermal heat tropos-form) . The main difference between these two classes is that lyotropic liquid crystals can change shape with the concentration and temperature, in contrast to thermotropic molecules for which the nature of the phases depends only on temperature
- Lamellar phase: one-dimensional ordered structure
- Phase Hex: Two-dimensional ordered structure
- Cubic phase: three-dimensional structure in order
we want to talk about nano-crist, it is called crystal normal but at the nanoscale (1-100 nm)
If it is nano crystal it should satisfy (i) large fraction of surface atoms(ii) large surface energy (iii) spatial confinement (iv) reduced imperfections (v) Internal energy will become more and more, thermal expansion can not be there, thermal conductivity and diffusivity decreases (vi) periodicity and regularity in the arrangement of atoms
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