Which mechanism fundamentally limits the effectiveness of molecular sieves in separating similarly sized molecules?

💡 Explanation

When similarly sized molecules enter a molecular sieve, separation relies on differential van der Waals interactions affecting adsorption affinity within the pores, causing some molecules to adhere more strongly. Therefore, van der Waals interactions limits effectiveness, rather than quantum tunneling, Brownian motion or electrostatic forces, which are less influential in this context.

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