why when increase the concentration of surfactant the size distribution become broader or FWHM increase?
Zaid Hamid
Typically the size decreases with increased surfactant concentration. Other factors such as shear conditions and dilution should also be taken account of.
Dear all, it is mainly the CMC and HLB of the surfactant that decide on the size and shape of the particles. Similar questions have been treated within RG. These are the links. My Regards
https://www.researchgate.net/post/Is_there_a_relationship_between_the_value_of_CMC_of_a_surfactant_and_its_micelle_size/amp
https://www.researchgate.net/post/Why_the_particle_size_decreases_when_the_concentration_of_surfactant_increases/amp
If you measure the shape of surfactant micelles, you use SAXS, if the structure of the amorphous substance or crystalline, then the XRD. Everywhere you deal with a paired distribution function (PDF). FWHM refers to her. If it is wide, then the substance has a large entropy (micelles, solutions). If it is narrow, then lower entropy (crystals). The area under the peaks corresponds to the number of neighbors, the scattering ability of the corresponding atoms. PDF of various substances can be found in the links
Article Structure of Micelles of Sodium Dodecyl Sulphate in Water: a...
Article MAGNETIC PROPERTIES OF Gd(III) IN AQUEOUS MICELLAR SYSTEMS
Article Physico-Chemical Properties of Nanoparticles Functionalized ...
DLS can also be used to measure the micelles in the system plus the CMC. See attached.
Dr. S. Kalidhasan
The higher the concentration of particles in the thermodynamic system, the greater the entropy.
Hi;
The surfactants are usually employed to limit agglomeration of nanoparticles and so they act on reducing particle size. For more information see attached file.
With my best regards
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