Mineral acid monitored physicochemical studies of oil-in-water nanoemulsions

Ashok Kumar Jangid, Parth Malik, Man Singh

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Oil-in-water (o/w) nanoemulsions preparation, with 0.9 to 4.6 mmol·kg−1 peanut oil, 0.004 mol·kg−1 aqueous cetyltrimethylammonium bromide (CTAB), 1.4 mol·kg−1 ethanol (cosolvent) and 0.022 mol·kg−1 glycerol (cosurfactant) is reported. For proticity effects on dispersion, separate formulations using 0.14 mmol·kg−1aqueous HCl, H2SO4 and H3PO4 having 0.14, 0.42 and 0.84 ionic strengths were prepared. The H3PO4 enhanced the oil dispersion via 27.75% size decrements with>100% zeta potential increments, the H2SO4caused a vigorous aqueous aggregation through SO4 2−electrostatic interactions weakened dispersion via 32.77% particle size and 41.61% PDI increments. The Cl, SO4 2− and PO4 3− aqueous immobilizations caused a highest surface excess concentration for H3PO4with a lowest per mmol H2O and H3O+ surface area enclosure. Anionically smallest sized HCl caused a finest dispersion inferred via 0.93 to 5.62% viscosity and 1.53 to 30.82% friccohesity (CF to IMF conversion index) increments. Compared to the blank formulations, the mineral acids have produced ΔG > 0, 11.36 to 83.47% lower activation energy and ΔH > 0 with their higher thermodynamic and kinetic stability.

Original languageEnglish
Pages (from-to)439-452
Number of pages14
JournalJournal of Molecular Liquids
Volume259
DOIs
StatePublished - 1 Jun 2018

Keywords

  • Dispersion
  • Friccohesity
  • Nanoemulsions
  • Proticity
  • Viscosity
  • Zeta potential

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