A model of compression isotherms for analyzing particle layers

Marczak, Wojciech; Rogalski, Marek; Modarressi, Ali; Rogalska, Ewa

doi:10.1016/j.colsurfa.2015.10.051

Cited by 8 publications

(10 citation statements)

References 51 publications

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“…Sample compression isotherms measured for interfacial films of either lecithin, saponin, or lecithin–saponin mixtures (red curve: lecithin; green curve: saponin+lecithin; purple curve: saponin) and sample fits of the model by Marczak et al to compression isotherms (black dashed lines). The aqueous phase was either DI water (a) or NaCl solutions in DI water (b).…”

Section: Resultsmentioning

confidence: 99%

“…The area corresponding to 50% of this MLPD pressure plateau is denominated A L, i and the MLPD pressure plateau is denominated as Π MLPD, i (where i refer the layer considered). The model is given by (1): where n i is an exponent defined by , and k is a proportionality constant defined in Marczak et al…”

Section: Methodsmentioning

confidence: 99%

“…The parameters of the model by Marczak et al were estimated by fitting the model to the data. These parameters include Π MLPD , i , A L, i , and the maximum compressibility modulus for each layer i ( C s ‑1 ) i , which was calculated using (2) where n i is the power law exponent used in eq .…”

Section: Methodsmentioning

confidence: 99%

“…Additional details regarding the model used can be found in the manuscript authored by Marczak at al …”

Section: Methodsmentioning

confidence: 99%

“…The compression isotherm data were fitted to the model of Marczak et al 44 This model describes films using one or more layers (the layer number is denoted as (i). Each layer follows a sigmoidal compression curve, which is characterized by a surface pressure plateau at a minimum linear particle distance (MLPD).…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Zein-Bonded Graphene and Biosurfactants Enable the Electrokinetic Clean-Up of Hydrocarbons

et al. 2021

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Nonaqueous phase liquids (NAPL, e.g., hydrocarbons and chlorinated compounds) are common groundwater pollutants. Electrokinetic remediation of NAPLs uses electric fields to draw them toward electrodes and remove them from groundwater. The treatment requires NAPL mobility. Emulsification increases mobility, but at a risk for downstream receptors. We propose using alkaline aqueous solutions of zein and graphene nanoparticles (GNP) to form conductive materials, which could also act as barriers to control NAPL migration. Alkaline zein−GNP solutions can be injected in the polluted soil and solidified by neutralizing the pH (e.g., with glacial acetic acid, GAA). Shear rheology experiments showed that zein−GNP composites were cohesive, and voltammetry showed that GNP increased electrical conductivity of zein-based materials by 3.5 times. Gas chromatography−mass spectroscopy (GC−MS) demonstrated that the electrokinetic treatment of model sandy aquifers yielded >60% and ∼47% removal of emulsified toluene in freshwater and in salt solutions, respectively (with 30 min treatment using a 10 V differential voltage between a zein−GNP and an aluminum electrode. NaCl was used as model salt contaminant. The conductivity of surfactant solutions was lower in saline water than in freshwater, explaining differences in toluene removal. Toluene−water emulsions were stabilized using the natural surfactants lecithin and saponin. These surfactants acted synergistically in stabilizing emulsions in either freshwater or salt solutions. Lecithin and saponin likely interacted at toluene−water interfaces, as indicated by the morphology, interfacial tension and compressional rigidity of toluene−water interfaces with both components (relative to interfaces of either lecithin or saponin alone). The compressional behavior of interfacial films was well-described by the Marczak model. Electrokinetic treatment of saturated model sandy aquifers also decreased the turbidity of emulsions of water and either tricholoroethylene (TCE, by ∼41%) or diesel (by ∼75%), in the presence of a bacterial biosurfactant. This decrease was used as semiquantitative indicator of NAPL removal from water.

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Section: Resultsmentioning

confidence: 99%