 Tetradecyltrimethylammonium bromide

Tetradecyltrimethylammonium bromide is a cationic surfactant with a fourteen-carbon hydrophobic chain and a positively charged trimethylammonium headgroup; bromide supplies the counterion.

In water, aggregation into micelles depends on concentration and solution conditions. Comparing related surfactants with different chain lengths helps separate the influence of hydrophobic chain size from that of the charged headgroup.^[ref]