| Title: | The influence of cohumulone on thermodynamics of micellization of alkyl trimethyl ammonium bromide surfactants |
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| Authors: | ID Skarlovnik, Tjaša (Author)
ID Šarac, Bojan (Author)
ID Bren, Urban (Author)
ID Vohl, Sabina (Author)
ID Hostnik, Gregor (Author) |
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| Files: |  1-s2.0-S092777572600138X-main.pdf (5,11 MB)
MD5: 26129A776FABBEDE7BAE2F2B1573C7BA
 https://www.sciencedirect.com/science/article/pii/S092777572600138X?via%3Dihub
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| Abstract: | 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. |
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| Keywords: | cohumulone, cationic surfactants, CMC, fluorescence spectroscopy, DLS, ITC |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 28.11.2025 |
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| Article acceptance date: | 14.01.2026 |
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| Publication date: | 15.01.2026 |
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| Publisher: | Elsevier B. V. |
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| Year of publishing: | 2026 |
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| Number of pages: | 10 str. |
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| Numbering: | Vol. 736, [article no.] 139599 |
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| PID: | 20.500.12556/DKUM-96694  |
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| UDC: | 54 |
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| ISSN on article: | 1873-4359 |
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| COBISS.SI-ID: | 265422851 |
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| DOI: | 10.1016/j.colsurfa.2026.139599 |
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| Copyright: | © 2026 The Author(s).
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| Publication date in DKUM: | 23.01.2026 |
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| Views: | 169 |
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| Downloads: | 9 |
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| Metadata: |    |
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| Categories: | Misc.
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