Multistep Micellization of Standard Surfactants Evidenced by Second Harmonic Scattering
| Autor: | Emmanuel Benichou, Pierre F. Brevet, Oriane Bonhomme, L. Sanchez |
|---|---|
| Přispěvatelé: | Optique non linéaire et interfaces (ONLI), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2021 |
| Předmět: |
Ammonium bromide
Materials science Surfactants Thermodynamics 02 engineering and technology 010402 general chemistry 01 natural sciences Micelle [SPI]Engineering Sciences [physics] Surface-Active Agents chemistry.chemical_compound Materials Chemistry [CHIM]Chemical Sciences Molecule Physical and Theoretical Chemistry Sodium dodecyl sulfate Micelles [PHYS]Physics [physics] Optical properties Scattering Sodium Dodecyl Sulfate Nonlinear optics Micellization Molecules 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Monomer chemistry Second Harmonic Generation Microscopy Critical micelle concentration 0210 nano-technology |
| Zdroj: | Journal of Physical Chemistry B Journal of Physical Chemistry B, American Chemical Society, 2021, 125 (38), pp.10876-10881. ⟨10.1021/acs.jpcb.1c06673⟩ |
| ISSN: | 1520-5207 1520-6106 |
| Popis: | International audience; Processes involving in solution a reduced number of molecules are difficult to identify and characterize. Here, we show that micellization of standard surfactants, namely sodium dodecyl sulfate and trimethyl tetradecyl ammonium bromide, two nonefficient compounds for quadratic nonlinear optics, can be investigated by second harmonic scattering (SHS). In particular, the formation of aggregates at concentrations smaller than the critical micellar concentration is evidenced through a nonmonotonic behavior of the SHS intensity as a function of the surfactant concentration. A simple model based on chemical equilibria between monomers and micelles is proposed to account for the experimental observations. Signature of long-range molecular orientation correlation is revealed by polarization resolved experiments and is discussed regarding micellization and charge-induced effects. |
| Databáze: | OpenAIRE |
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