Porous Frameworks: Pores, Guests and Stability
Build a solid out of nodes and linkers and the empty space becomes the useful part. Pore size and the chemistry of the internal surface decide which guest goes in, how strongly it is held and whether the framework survives its removal.
What a learner can do afterwards
- Predicts the topology a given node geometry and linker length would produce
- Reads an adsorption isotherm and extracts pore volume and binding strength
- Explains why some frameworks collapse when the solvent is removed and how that is avoided
- Matches a separation or storage problem to a framework property that would address it
1 · Read
Build a solid from nodes and linkers and the empty space becomes the useful part. Pore size decides which guest fits, and the chemistry of the inner surface decides how strongly each guest is held.
Two gases share almost the same size but differ in polarity. A framework with a polar inner surface grips the polar gas and lets the other pass, so the mixture separates. Size admits both, but surface chemistry picks one.
Some frameworks collapse when the solvent is removed, because capillary forces drag the walls together. Rigid linkers and gentle activation, such as supercritical drying, keep the pores open.
Read an adsorption isotherm like a report. The uptake plateau gives the pore volume, and a steep rise at low pressure means strong binding.
Nodes and linkers shape the pore, surface chemistry picks the guest, and gentle activation keeps it standing.
2 · Watch
Take it off screen
Where it sits
Learn first
This opens up
Nothing builds on it yet.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.