Can we talk about quantum confinement effect in CdS nanowires with diameter of about 50 nm and length in microns?
50nm diameter size nanoparticle is a lage size for several physical properties such as optical and electrical that's why quantum confinement is not strongly affecting. For example the energy gap in semiconductors affected for particle size less than around 10nm. while for thermal properties such as thermal conductivity the process is strongly affects the result since the waves are within the particles boundary. To get familiar to nanosize particles you can read the power point presentation
M. S. Omar
"Solid Surface and Nanoscale materials Structure"
July 2016
DOI10.13140/RG.2.2.31947.59684
Conference: CharmoAt: University of CharmoAffiliation: University of Salahaddin
The dimensions aren't that important. Of course if one does have an object of finite size, its contents is ``confined'' within it-but, since there aren't any particular quantum effects that select the size of the wire in the first place, calling this an example of confinement at all is meaningless, since it is possible to construct nanowires of many different sizes.
``Confinement'' implies some sort of mechanism of the contents that selects the ``size'' and ``quantum'' implies that the mechanism is the consequence of quantum properties of the contents.
For the case of nanowires, while the contents may have quantum properties, these don't select one size over another. That's why it's not useful talking about quantum confinement in this context.
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