DLS revealed higher scattering contrast and slower diffusion for wormlike micelles in the presence of nanoparticles. These results were interpreted as the decoration of the chains of wormlike micelles by nanoparticles of Fe(OH). A pearl-necklace model was successfully used to adjust SAXS curves, revealing nanoparticles with ∼3 nm of diameter, spaced ∼2 nm apart along the string. This result agrees with TEM and Cryo-TEM images. The formed structure prevents the coagulation of nanoparticles, assuring high stability to the dispersion.
Nanopartículas de hidróxidos metálicos são precursores de bastante interesse acadêmico e industrial, sendo a estabilização de suas dispersões uma parte fundamental. Nesse projeto foi estudada a estabilização de nanopartículas formadas por cinco diferentes hidróxidos dos cátions: cobre (II), cobalto (II), niquel (II), ferro (III) e zinco (II), onde as nanopartículas foram formadas pelo ajuste de pH na solução contendo micelas gigantes (MG). As MGs são formadas pela combinação de brometo de hexadeciltrimetilamônio e salicilato de sódio. Assim que as nanopartículas são formadas, elas interagem com a superfície das MGs, formando uma estrutura supramolecular do tipo "pearlnecklace", impedindo suas agregações.
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