This is written very poorly.
For instance “The team found that water permeability in carbon nanotubes (CNTs) with diameters of 0.8 nanometre significantly exceeds that of wider carbon nanotubes.”
They mean salt exclusion is less in wider tubes.
And they spelled nanometer wrong - nanametre.
Still it’s interesting.
nanometer is the American spelling.
nanometre is the international spelling.
“And they spelled nanometer wrong - nanametre.”
You misspelled their misspelling which is not a misspelling but a British variation.
Don’t you just hate it when you try to look smart and you fail? ;)
Has no meaning.