Surface engineered novel cationic surfactants with enhanced surface adsorption for environmental applications

Hashimzada, SZ, Abbasov, V, Aoun, RB, Smječanin, N, Ahmadbayova, S, Ansar, S and Sher, F ORCID: https://orcid.org/0000-0003-2890-5912, 2024. Surface engineered novel cationic surfactants with enhanced surface adsorption for environmental applications. Journal of Molecular Liquids, 413: 126012. ISSN 0167-7322

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Abstract

Gemini Cationic Surfactants (GCS) have garnered significant attention due to their distinctive molecular structure, featuring two hydrophilic head groups associated with a hydrophobic spacer. This distinctive configuration enables diverse applications across various fields. Hence, the current study introduces a novel series of GCSs, ethanediyl-1,2-bis[di(2-hydroxypropyl) alkylammonium] dibromide (Cn-C2-Cn[IsoPr(OH)2; n = 9, 12 and 14) and comprehensively explore their properties, highlighting their promising antimicrobial activity. The synthesis of GCSs was validated using 1H NMR and IR spectroscopy. Dynamic Light Scattering was employed to determine the dimensions of Gemini surfactant aggregates in aqueous solutions. Surface tension analysis determined critical concentrations of micelle (CMC), minimum surface area (Amin) and concentration of surface excess (Γmax). Physicochemical properties were assessed through conductivity and surface tension analyses in aqueous solutions. The CMC, Amin and Γmax values decrease as alkyl chain length extends. Surface tension data revealed strong adsorption of GCSs at interfaces. π values (mN/m) ranged from 36.7 (C14C2C14[Iso-Pr(OH)]2) to 45.3 (C9C2C9[Iso-Pr(OH)]2). Conductivity and surface tension measurements further characterized Gemini surfactants in aqueous environments at 298 K. The size of the micelle aggregates varied between C9C2C9[Iso-Pr(OH)]2 (1.2885 nm) and C14C2C14[Iso-Pr(OH)]2 (1.9210 nm), highlighting the impact of chain length on micelle size. Hence, the study highlights significant effect of the chain lengths on Gemini cationic surfactants’ self-assembly in dilute aqueous environments. Antimicrobial tests demonstrated significant activity of Cn-C2-Cn[IsoPr(OH)]2 GCSs at varying concentrations. Antimicrobial tests showed the significant antimicrobial potential of these GCS compounds, suggesting their potential and promising applications in medical, hygiene, environmental sanitation and advanced materials sectors.

Item Type:	Journal article
Publication Title:	Journal of Molecular Liquids
Creators:	Hashimzada, S.Z., Abbasov, V., Aoun, R.B., Smječanin, N., Ahmadbayova, S., Ansar, S. and Sher, F.
Publisher:	Elsevier BV
Date:	1 November 2024
Volume:	413
ISSN:	0167-7322
Identifiers:	Number Type 10.1016/j.molliq.2024.126012 DOI 2556380 Other
Rights:	© 2024 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Borcherds
Date Added:	14 Jan 2026 17:23
Last Modified:	14 Jan 2026 17:23
URI:	https://irep.ntu.ac.uk/id/eprint/55041

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