Tuning surface assembly of oleyl-capped nanoparticles in AOT microemulsion phase with optimal alkane-to-alkanol ratio

Rebeca Fortes Martín; Sibylle Rüstig; Ilko Bald; Joachim Koetz

doi:10.1016/j.colcom.2025.100836

April 9, 2025Colloids and Interface Science CommunicationsOpen Access

Tuning surface assembly of oleyl-capped nanoparticles in AOT microemulsion phase with optimal alkane-to-alkanol ratio

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Key Points

To examine how altering the alkane-to-alkanol ratio in water-in-oil microemulsions controls the surface assembly patterns of oleyl-capped nanoparticles.
Formulated water-in-oil microemulsions using dioctyl sodium sulfosuccinate (AOT) as the surfactant and dispersed oleyl-capped nanoparticles into the oil phase.
Adjusted the volumetric ratio of heptane to pentanol, employing pentanol simultaneously as a co-surfactant and nanoparticle flocculant solvent.
Deposited the nanoparticle structures onto surfaces via drop-casting directly from the microemulsion phase.
Altering the heptane-to-pentanol solvent ratio directly dictated distinct nanoparticle organization patterns during surface assembly.
Incorporating a minor proportion of heptane into pentanol triggered the spontaneous formation of filament networks without external clustering additives.

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Implication

Experimental study demonstrates tunable nanoparticle surface assembly in AOT microemulsions, indicating an additive-free method to form filament networks by adjusting solvent ratios.

Abstract

A simplified procedure for the surface assembly of oleyl-capped nanoparticles from water-in-oil microemulsions is presented. Changing the heptane-to-pentanol ratio in the oil phase resulted in different surface assemblies. Remarkably, a minor proportion of heptane in pentanol enabled the formation of filament networks, without the assistance of other additives for clustering effects. • Water-in-oil microemulsions with AOT as surfactant. • Oleyl-capped nanoparticles dispersed in the oil solvents of microemulsions. • Surface assembly by drop-casting of the microemulsion phase. • Pentanol as co-surfactant and flocculant solvent of oleyl-capped nanoparticles. • Optimal heptane-to-pentanol ratio in the oil phase for tuning surface assembly.

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Martín et al. (2025) studied this question.

synapsesocial.com/papers/6a1ad9ab739ab56a90860bd3 https://doi.org/10.1016/j.colcom.2025.100836

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Tuning surface assembly of oleyl-capped nanoparticles in AOT microemulsion phase with optimal alkane-to-alkanol ratio

Key Points

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Cite This Study

Tuning surface assembly of oleyl-capped nanoparticles in AOT microemulsion phase with optimal alkane-to-alkanol ratio

Key Points

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Implication

Abstract

Discussion

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