20.500.12556/DKUM-96694 The influence of cohumulone on thermodynamics of micellization of alkyl trimethyl ammonium bromide surfactants In the present study, micellization of three cationic surfactants, dodecytrimethylammonium bromide (DTAB), tetradecytrimethylammonium bromide (TTAB), and hexadecyltrimethylammonium bromide (HTAB), in the presence and absence of cohumulone (CH), was carefully examined with a wide variety of methods. Critical micelle concentration (CMC) was determined using fluorescence (DTAB: 12.2 mM, CH added: 14.50 mM; TTAB: 2.38 mM, CH added: 4.80 mM; HTAB: 0.66 mM, CH added: 2.29 mM) and conductivity measurements. The thermodynamics of micellization was thoroughly examined using Isothermal Titration Calorimetry (ΔH°mic (kJ/mol) at 25 °C: DTAB: −1.48; added CH: −1.57; TTAB: −3.88; added CH: −4.16; HTAB: −7.98; added CH: −7.19). The effect of cohumulone on micelle dimensions was observed with Dynamic light scattering (DLS; DTAB: 4.2 nm, CH added: 8.1 nm; TTAB: 3.6 nm, CH added: 5.9 nm; HTAB: 3.9 nm, CH added: 5.4 nm). Based on these results, a description of the micellization of alkyltrimethylammonium bromide surfactants in the presence of CH was developed. While CMC and micellization thermodynamics remain virtually unaltered in the presence of CH, micelle size and its polydispersity get significantly increased, and the micelle formation process is notably changed. cohumulone cationic surfactants CMC fluorescence spectroscopy DLS ITC kationske površinsko aktivne snovi fluorescenčna spektroskopija true false true Elsevier B. V. Angleški jezik Slovenski jezik https://www.sciencedirect.com/journal/colloids-and-surfaces-a-physicochemical-and-engineering-aspects © 2026 The Author(s). Članek v reviji 2026-01-23 13:30:03 2026-01-23 13:30:03 2026-04-20 07:56:27 0000-00-00 00:00:00 2026 0 0 10 str. Vol. 736, [article no.] 139599 5 May 2026 0000-00-00 Zaloznikova Objavljeno apc 2025-11-28 2026-01-14 2026-01-15 54 265422851 10.1016/j.colsurfa.2026.139599 1873-4359 1-s2.0-S092777572600138X-main.pdf 1-s2.0-S092777572600138X-main.pdf 1 26129A776FABBEDE7BAE2F2B1573C7BA 7ecc954ceae426f420b57be56848b06bc4d35524e698e1dec4d2c99eef80d00e 03795f0f-f858-11f0-8c23-00155d00018d https://dk.um.si/Dokument.php?lang=slv&id=202496 https://www.sciencedirect.com/science/article/pii/S092777572600138X?via%3Dihub 0 cc99ecab-fdb6-11f0-8805-00155d00018d https://dk.um.si/Dokument.php?lang=slv&id=202832 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0