Im confused with zero dimension in nano. can anyone explain it??

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If the size a particle is very less say for example less than 5 nm or so, it is fully confined, an atom or a free electron cannot move in any direction, it is confined three dimensionally. So called 0 dimension.

Or

In another way its size is appreciably lesser than observable limit

Thank you very much for your answer for my question sir. I just want to clarify more on it. When I asked the same question in a seminar, they told, "we can not measure the crystallographic parameters such as a, b and c in 0D but its possible in 1D, 2D and 3D". And they have given the example of sphere in nano scale. I just want to know that whether zero dimension is anything to do with crystallographic parameters (as they told) ??
Zero dim is nothing but quantum dot. The size will be approximately <10nm. Comparable to its bohr atomic radius the particle size will vary. So u cant tell that all particles less than 10 nm are quantum dots.It will vary from material to material. It is possible to measure crystallographic parameters. Moreover, u can get the d spacing from TEM.

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