Magnetic vs. non-magnetic colloids – A comparative adsorption study to quantify the effect of dye-induced aggregation on the binding affinity of an organic dye

Williams, Tyler A.; Lee, Jenny; Diemler, Cory; Subir, Mahamud

doi:10.1016/j.jcis.2016.07.038

Cited by 11 publications

(3 citation statements)

References 35 publications

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“…The detailed correction procedure has been described previously. 61 In brief, the raw intensity was corrected for opacities of the corresponding dye solution and NEs at both the fundamental and SHG wavelengths, as determined from UV−vis absorption spectroscopy. Note, we did not observe two-photon fluorescence from the dyes at the second harmonic wavelength.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…In the isotherm plots (such as the ones shown in Figure ), the y -axis represents the SHG intensity after correction and subtraction of hyper-Rayleigh scattering from the control samples. The detailed correction procedure has been described previously . In brief, the raw intensity was corrected for opacities of the corresponding dye solution and NEs at both the fundamental and SHG wavelengths, as determined from UV–vis absorption spectroscopy.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Molecular Adsorption and Physicochemical Properties at Liquid/Liquid Nanoemulsion Soft Interfaces: Effect of Charge and Hydrophobicity

Sara,

Coers,

Behrman

et al. 2024

J. Phys. Chem. B

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Contrary to the popular adage, "Oil and water do not mix", evidence of mixtures comprising the two "immiscible" liquids is universal. In the presence of an emulsifier, oil and water mix to form a colloidal suspension known as emulsion. Their utility in many areas such as food chemistry, biomedical health sectors, catalysis, and the petroleum industry is well recognized. While their application in our society is pervasive, tantalizing fundamental questions regarding the chemistry that takes place at the oil/water soft interface still linger. For instance, do organic compounds show proclivity for this molecularly thin boundary and, if so, what forces, hydrophobic or pure electrostatic among others, drive the molecular interactions? The focus of this Article is on molecular adsorption at the interface of oil-in-water (O/W) nanoemulsion (NE) droplets. The effect of the interfacial surfactant charge (positive, negative, zwitterionic, and neutral) on the affinity of aromatic organic compounds on the O/W NEs has been studied. Using a second harmonic generation (SHG), a nonlinear light scattering technique, we have explored the adsorption equilibrium of charged and neutral organic dyes. By variation of the surfactant functional group and thereby the interfacial charge properties, the source of the adsorption interaction, if any, has been deduced. The population of surfactants containing a charged functional group at the O/W interface is found to be sparse, yet adsorption at some of these interfaces has been observed. A purely electrostatic Coulomb interaction plays a key role, but the presence of a charged interface does not necessitate molecular adsorption. Hydrophobic interactions are not a major driving force of adsorption for the SHG dyes studied. However, a possible pi-interaction is likely in explaining the accumulation of neutral aromatic compounds at the O/W NE interface. These intricate adsorption features are discussed in the context of NE interfacial charge properties and their stability upon molecular adsorption.

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Section: ■ Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Molecular Adsorption and Physicochemical Properties at Liquid/Liquid Nanoemulsion Soft Interfaces: Effect of Charge and Hydrophobicity

Sara,

Coers,

Behrman

et al. 2024

J. Phys. Chem. B

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“…23,24 Thus, several works have been devoted to determinating the physical parameters and demonstrating phase boundary mapping of the phase transition by examining a range of volume fractions, temperature, and interaction strength between particles. [25][26][27][28][29][30][31][32][33][34][35] As schematically shown at the top of Fig. 1, membrane nano inclusions interact with the surrounding membrane lipids.…”

Section: Introductionmentioning

confidence: 99%