Simultaneous influence of uni-univalent salt aqueous solutions and sodium dodecyl sulfate surfactant on interfacial tension of toluene-water

Saien, Javad; Moghaddamnia, Farzaneh; Mishi, Syden

doi:10.1007/s11814-013-0001-3

Cited by 3 publications

(1 citation statement)

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“…The interfacial tension is reported in the literature to vary between 36.1 and 38.2 mN/m. [14][15][16][17] At long times, the interfacial tension decreases until the surface tension reaches a steady value. This long time value, , represents a significant reduction in the interfacial tension to below 5 mN/m.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nanoparticle Surface Chemistry on Adsorption and Fluid Phase Partitioning in Aqueous/Toluene and Cellular Systems

Gambinossi¹,

Lapides²,

Anderson³

et al. 2015

j nanosci nanotechnol

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Copolymers of di(ethylene glycol) methyl ether methacrylate (x = MeO2MA) and oligo(ethylene glycol) methyl ether methacrylate (y = OEGMA) display lower critical solution phenomena in aqueous systems that are tunable by the copolymer ratio (x:y), ionic strength, and temperature. These properties enable tuning the hydrophobicity of macromolecular systems by variation of (x:y). For nanoparticles stabilized with these macromolecules, this provides a systematic approach to understanding the impact of surface chemistry, specifically hydrophobicity, on the equilibrium and transport properties of nanomaterials in biphasic systems. We synthesized a homologous series of gold nanoparticles capped by these copolymers, Au@(MeO2MA(x)-co-OEGMA(y)). By varying the copolymer 95:5 < (x:y) < 80:20 ratio, we studied the effect of surface hydrophobicity on the nanoparticle equilibrium adsorption isotherm and phase transfer at the aqueous-toluene interface. The increase in hydrophobicity from (x:y) = 80:20 to (x:y) = 95:5 is accompanied by an increase in the fractional coverage of the aqueous-toluene interface from f = 0.3 to f > 1, or multilayer adsorption and an increase in the characteristic adsorption timescale from τ(D) = 31 to τ(D) = 450 seconds. The equilibrium partition coefficient for the aqueous/toluene systems, K(T/W) is also a strong function of (x:y), increasing from K(T/W) (80:20) = 0.7 to K(T/W) (95:5) = 9.8. We also observed an increase in cellular uptake for increasing (x:y) suggesting that surface chemistry alone plays a significant role in intercellular transport processes.

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Section: Resultsmentioning

confidence: 99%