Nanoclay 101

Nanoclay is a word used loosely enough that two people can agree they need some and mean genuinely different materials. This pillar exists to fix that before you spend money — the vocabulary, the structure, and the two numbers that predict most of what a clay will do.

If you have five minutes, read What Is Nanoclay?. It gives a practical definition, explains what makes a clay “nano” in the first place, covers the difference between a tactoid and an exfoliated platelet, and — usefully — spells out what nanoclay is not.

If you have longer, What Are Nanoclays? is the fuller plain-language guide: how the layers are structured, the five nanoclays you will actually encounter, what they do in a formulation, and roughly what they cost.

Then fix the vocabulary. Bentonite, smectite, montmorillonite sorts out three words that get used interchangeably and are not interchangeable at all. Getting this wrong is how specifications end up describing a rock when they meant a mineral.

Two concepts do the real predictive work. Cation exchange capacity is the closest thing nanoclay has to a master variable — it is why montmorillonite swells and kaolinite does not, and why two clays sold under the same name can behave differently. Exfoliation, intercalation and aspect ratio are the three terms behind every performance claim you will read, and the article is explicit about how to tell a real claim from a loose one.

Cover these five and the rest of this site reads much faster.