Surfactant Systems and Interfacial Chemistry
Summary
Surfactants are amphiphilic molecules that congregate at interfaces and in bulk solution to reduce surface or interfacial tension and to form ordered aggregates. Their dual affinity for polar and non-polar environments underpins a vast array of phenomena, from the cleaning action of detergents to the stabilisation of emulsions, foams and dispersions. At concentrations above a characteristic critical micelle concentration, surfactants self-assemble into micelles, vesicles or more complex mesophases, driving solubilisation of hydrophobic substances and enabling controlled delivery of active agents. Interfacial chemistry explores the structure, dynamics and energetics of surfactant-laden interfaces, revealing how molecular architecture, ionic strength, temperature and co-solutes govern adsorption, assembly and phase behaviour. This field stands at the confluence of colloid science, materials chemistry and chemical engineering, with immediate relevance to oil recovery, pharmaceuticals, food technology and environmental remediation. Continuing advances in spectroscopy, scattering and simulation are elucidating the molecular mechanisms by which surfactants modulate interfacial rheology, enable selective separations and mediate chemical transformations at surfaces.
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Surfactant Systems and Interfacial Chemistry publication trend
The graph below shows the total number of articles in surfactant systems and interfacial chemistry across all publications each year (not limited to Nature Index journals).
Technical terms
Surfactant: An amphiphilic molecule that adsorbs to interfaces and lowers surface or interfacial tension.
Micelle: A self-assembled aggregate of surfactant molecules in solution, with hydrophobic tails inward and hydrophilic heads outward.
Critical Micelle Concentration (CMC): The surfactant concentration above which micelles form and below which only monomers exist.
Interfacial Tension: The free-energy cost per unit area of creating an interface between two immiscible phases.
Self-Assembly: The spontaneous organisation of molecules into structured aggregates driven by non-covalent interactions.
Gemini Surfactant: A class of dimeric amphiphiles with two hydrophobic chains and two head groups linked by a spacer, offering lower CMC and enhanced performance.
References
- Surfactant Self-Assembling and Critical Micelle Concentration: One Approach Fits All?. Langmuir (2020).
- Cationic Surfactants: Self-Assembly, Structure-Activity Correlation and Their Biological Applications. International Journal of Molecular Sciences (2019).
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