Question

What are the dimensions of nanomaterials?
A. Between $1nm$ and $100nm$
B. Between $100nm$ and $10000nm$
C. Between $0.01nm$ and $1nm$
D. Between $1\mu m$ and $100\mu m$

Answer 1

Hint: A nanoparticle is a very small particle that is undetectable to the naked eye. Nanoparticles can have very different physical and chemical properties than bigger materials.  In nanotechnology, a nanoparticle is defined as a small object that behaves as a whole unit in terms of its transport and properties. It is further classified according to size: in terms of diameter.

Complete answer:
Nanomaterials are materials with at least one exterior dimension of $100$ nanometres or internal structures of $100$ nanometres or less. A nanoparticle is a small particle whose size ranges between $1$to $100$ nanometres in size.
The nanomaterials that have the same composition as known materials in bulk form may have different physical-chemical properties than the same materials in bulk form, and they may behave differently if they enter the body. They may thus pose different potential hazards.
Aviation and space, chemical industry, optics, solar hydrogen, fuel cell, batteries, sensors, power generation, aeronautic industry, building/construction industry, automotive engineering, consumer electronics, thermoelectric devices, pharmaceuticals, and cosmetic industry are just a few of the important applications of nanomaterials.
Because nanoparticles have the ability to pass the blood-brain barrier, they can be used to deliver medications directly to the brain. On the other hand, because nanoparticles used to deliver medications may be poisonous to the brain, this is a huge disadvantage.
So, the correct answer is “Option A”.

Note:
As the particle size of nanoparticles decreases, surface area increases. This enhances the catalytic activity of the nanoparticles. Reduction of particle size from micron to nanometre scale influences their optical properties.