03846 IUPAC Gold Book - mesomorphic phase 10.1351/goldbook.M03846 M03846 current mentioned: nematic state 1 Often formed by concentrated systems of surfactants. These are states of matter in which anisometric molecules (or particles) are regularly arranged in one (nematic state) or two (smectic state) directions, but randomly arranged in the remaining direction(s). anisometric https://dev.goldbook.iupac.org/terms/view/I03298 smectic state https://dev.goldbook.iupac.org/terms/view/S05714 surfactants https://dev.goldbook.iupac.org/terms/view/S06194 PAC, 1972, 31, 577. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry' on page 613 (https://doi.org/10.1351/pac197231040577) https://dev.goldbook.iupac.org/terms/view/M03846/html https://dev.goldbook.iupac.org/terms/view/M03846/json https://dev.goldbook.iupac.org/terms/view/M03846/plain Citation: 'mesomorphic phase' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.M03846 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-03-13T16:30:42+00:00