You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Activated charcoal and zeolites are both categorized by having pores equal to or smaller than what size?" whose answer is 100 nanometers.
Each document should contain about 30 words, and these documents should contain useful information.

Query: typical pore size of activated charcoal and zeolites
Useful Output:

Doc 1: In this study we use the representative pore sizes of 7.0, 8.9, 18.5, and 27.9 Å and N2 isotherms at 77.4 K to determine the PSD which is later
Doc 2: Here, we report a synthetic method to prepare porous carbon materials with pore sizes that can be precisely controlled at the Ångstrom-level.
Doc 3: The results showed that the activated zeolite produced in this study has a particle size of 118.4 nm with water absorption capacity of 52.08%.
Doc 4: Activated carbon has a very large surface area of 1.95×106 m2/kg, with a total pore volume of. 10.28×10-4 m3/kg and an average of 21.6 Å pore.
Doc 5: These tend to have specific pore sizes of molecular dimensions, and they may be selected (and marketed) as molecular sieves, in which case the