---
title: "Porous Frameworks: Pores, Guests and Stability"
description: "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 "
canonical: https://lightmysky.com/learn/science/porous-frameworks-pores-guests-and-stability-mt_csqPeYIhN6
source: https://lightmysky.com/learn/science/porous-frameworks-pores-guests-and-stability-mt_csqPeYIhN6.md
retrieved: 2026-09-12
---

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# 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.

Subject: Science · Area: Chemistry · Ages 22 to 23
Page: https://lightmysky.com/learn/science/porous-frameworks-pores-guests-and-stability-mt_csqPeYIhN6

## Ready when they can

- 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

## Lesson: Solids built around empty space

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.

**Example.** 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.

**Tip.** Read an adsorption isotherm like a report. The uptake plateau gives the pore volume, and a steep rise at low pressure means strong binding.

**Recap.** Nodes and linkers shape the pore, surface chemistry picks the guest, and gentle activation keeps it standing.

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Solid-State Synthesis: Controlling Phase, Defect and Dopant](https://lightmysky.com/learn/science/solid-state-synthesis-controlling-phase-defect-and-dopant-mt_5gri5iZ0lV)
- [Coordination Compounds: Naming, Geometry and Isomerism](https://lightmysky.com/learn/science/coordination-compounds-naming-geometry-and-isomerism-mt_rkHM3jL3Ri)