The electrokinetic sonic amplitude effect in filtration membranes: Part I. Experimental

Djerdjev, Alex M.; Beattie, James K.; O'Brien, R.W.

doi:10.1016/j.memsci.2012.01.014

Cited by 3 publications

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a first step toward standardizing a protocol for studying the emulsion drop size and charge and their influence on hydrogel–nanoemulsion microstructure and mechanical properties, this paper turns to electroacoustic spectroscopy. As demonstrated for colloidal dispersions, emulsions, membranes, soft nanocomposites, − and polyelectrolytes, such a noninvasive measurement hinges on a theoretical model to convert the measured electrokinetic sonic amplitude (ESA) to dynamic mobility spectra. For emulsion-doped hydrogels, the ESA reflects drop size and interfacial charge, as well as rheological characteristics of the embedding hydrogel, thus presenting new opportunities for development as a standard testing platform for soft nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Hexadecane-Nanoemulsion-Doped Polyacrylamide Hydrogels

Afuwape

Hill

2021

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Hydrogels are promising supports for nanoemulsion drops since the skeleton provides a physical barrier to coalescence and possibly a thermodynamic barrier to Ostwald ripening. How these factors play a role in the encapsulation of oil drops in polymer networks for drug-delivery applications is largely unknown, owing to the challenge of measuring in situ drop size and understanding the drop–hydrogel interface. In this study, the electrokinetic sonic amplitude of sodium dodecyl sulfate (SDS)-stabilized hexadecane-in-water nanoemulsion drops in polyacrylamide hydrogels is harnessed to ascertain dynamic mobility spectra, which we interpret using a recently proposed model for highly charged nanodrops. The nanodrop radius in hydrogels was found to be close to their nanoemulsion counterparts (∼100–600 nm), with a frequency-independent shear viscosity (∼0.5 mPas at megahertz frequencies) and a frequency-independent shear modulus (∼1 kPa). From a macrorheological perspective, the low-frequency plateau modulus was concluded to increase systematically with the hexadecane volume fraction according to an Einstein intrinsic shear modulus having a quadratic correction for elastic interactions at finite volume fractions. The electroacoustic and micro- and macro-rheological analyses are complemented with swelling, confocal imaging, and electrical conductivity characterization. Together, these point to an “ideal behaving” microstructure that may be tailored for advanced drug-delivery systems. The electroacoustic testing platform developed in this work provides a beneficial tool for noninvasively characterizing the microstructure of nanoemulsion-doped hydrogels.

show abstract

Section: Introductionmentioning

confidence: 99%

Hexadecane-Nanoemulsion-Doped Polyacrylamide Hydrogels

Afuwape

Hill

2021

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…Figure 11(b) shows variation of zeta potential with inputted PPSD values in the 65 wt% suspension with CMC, where the Debye length, 1/κ, was 2.4 nm by the Duhkin method [29]. Thus, the thin EDL condition [30,31] was satisfied, and the zeta potential had close values for the classical theory [32] and the advanced theories [33]. The calculated zeta potential was negative, and it was −21.83 mV when d 50 was 3.5 µm with lgσ 0.4.…”

Section: Electroacoustic Resultsmentioning

confidence: 99%

Particle size distribution measurements of widely distributed carbonyl iron powder particles in concentrated suspensions using ultrasonic attenuation

Wei

Yang

Gao

2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

Particle size distribution (PSD) of wide-distributed carbonyl iron powder (CIP) particles in concentrated suspensions was measured by the ultrasonic attenuation technology, with the purpose to analyze their dispersion behaviors. And their zeta potential was measured with the electroacoustic technology. During measuring PSD of these particles with primary size ranging from about 100 nm to 10 μm, both visco-inertial and scattering mechanisms were considered. It was found that there appeared opposite evolution of PSD curves for nano-scale particles and micro-particles, namely, d01 increased but d99 decreased when the concentration increased from 15 wt% to 35 wt%, while the trend was reverse when the concentration increased from 35 wt% to 75 wt%. It meant that small particles and large particles had opposite dispersion behaviors when the concentration changed. And zeta potential of the particles was negative, with absolute values not higher than 22 mV, while particle concentration and carrier liquids had some influences. This opposite evolution was found firstly in measuring PSD in concentrated suspensions, where non-DLVO (Derjaguin, Landau, Verwey, and Overbeek) interactions could markedly influenced dispersion behaviors of the wide-distributed CIP particles. And it might bring forward some challenges to disperse these particles fully for some advanced applications.

show abstract

The electrokinetic sonic amplitude effect in filtration membranes: Part II – Theory

O'Brien

2012

Journal of Membrane Science

View full text Add to dashboard Cite

The electrokinetic sonic amplitude effect in filtration membranes: Part I. Experimental

Cited by 3 publications

References 32 publications

Hexadecane-Nanoemulsion-Doped Polyacrylamide Hydrogels

Hexadecane-Nanoemulsion-Doped Polyacrylamide Hydrogels

Particle size distribution measurements of widely distributed carbonyl iron powder particles in concentrated suspensions using ultrasonic attenuation

The electrokinetic sonic amplitude effect in filtration membranes: Part II – Theory

Contact Info

Product

Resources

About