Journal
LANGMUIR
Volume 38, Issue 24, Pages 7522-7534Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.2c00523
Keywords
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Funding
- AINSE Limited
- ARC Future Fellowship [FT160100191]
- NSF [DMR-0520547]
- European Union's Horizon 2020 research and innovation programme under the SINE2020 project [654000]
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Azobenzene-containing surfactants have been widely studied for their use in generating photoresponsive systems. This research focuses on tail substituted azo-surfactants to understand how surfactant structure can be tailored for specific applications. The study reveals the significant influence of tail group structure and intermolecular pi-pi interactions on the behavior of azo-surfactants.
Azobenzene-containing surfactants (azo-surfactants) have garnered significant attention for their use in generating photoresponsive foams, interfaces, and colloidal systems. The photoresponsive behavior of azo-surfactants is driven by the conformational and electronic changes that occur when the azobenzene chromophore undergoes light-induced trans (sic) cis isomerization. Effective design of surfactants and targeting of their properties requires a robust understanding of how the azobenzene functionality interacts with surfactant structure and influences overall surfactant behavior. Herein, a library of tail substituted azo-surfactants were synthesized and studied to better understand how surfactant structure can be tailored to exploit the azobenzene photoswitch. This work shows that tail group structure (length and branching) has a profound influence on the critical micelle concentration of azo-surfactants and their properties once adsorbed to an air-water interface. Neutron scattering studies revealed the unique role that intermolecular pi-pi azobenzene interactions have on the self-assembly of azo-surfactants, and how the influence of these interactions can be tuned using tail group structure to target specific aqueous aggregate morphologies.
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