Discussion
Why does a core-shell particle give high efficiency at moderate pressure?
Answer: A
Efficiency depends on how far a molecule must diffuse, which the thin shell makes small, while pressure depends on the overall particle diameter, which stays comparatively large. Surface area is actually lower, and neither bonding density nor pore width is the mechanism. Separating the two properties that a solid particle couples together is the whole idea, and it is a good example of a structural solution to a physical trade. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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