A Linear Diffusion Model of Adsorption Kinetics at Fluid/Fluid Interfaces

Staszak, Maciej

doi:10.1007/s11743-016-1789-8

Cited by 14 publications

(14 citation statements)

References 44 publications

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“…By employing theoretical models describing the absorption of amphiphilic molecules at the interfaces of immiscible liquids, it is possible to reveal that the molecular adsorption layer at the water/oil interface would result in a homogeneous concentration profile of molecules with a thickness ( L t ) of about ≈500 nm (see the Supporting Information for details). Interestingly, this predicted L t value is comparable to that experimentally observed in fL‐droplets containing a model dye and the above amphiphilic systems.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, a significant τ reduction in annulus is observed for fluorescein isothiocyanate (FITC), a probe critically sensitive to the pH or the hydrogen‐bond character of the environment (τ ann = 2 ns; τ HBD = 4 ns; see Figure S6c in the Supporting Information). This reduction can be likely ascribed to the up‐concentration of surfactants and/or the water molecules depletion (crowding inducing excluded volume effects) within the annuli…”

Section: Resultsmentioning

confidence: 99%

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Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

et al. 2019

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A simple, rapid, and highly controlled platform to prepare life‐inspired subcellular scale compartments by inkjet printing has been developed. These compartments consist of fL‐scale aqueous droplets (few µm in diameter) incorporating biologically relevant molecular entities with programmed composition and concentration. These droplets are ink‐jetted in nL mineral oil drop arrays allowing for lab‐on‐chip studies by fluorescence microscopy and fluorescence life time imaging. Once formed, fL‐droplets are stable for several hours, thus giving the possibility of readily analyze molecular reactions and their kinetics and to verify molecular behavior and intermolecular interactions. Here, this platform is exploited to unravel the behavior of different molecular probes and biomolecular systems (DNA hairpins, enzymatic cascades, protein‐ligand couples) within the compartments. The fL‐scale size induces the formation of molecularly crowded confined shell structures (hundreds of nanometers in thickness) at the droplet surface, allowing discovery of specific features (e.g., heterogeneity, responsivity to molecular triggers) that are mediated by the intermolecular interactions in these peculiar environments. The presented results indicate the possibility of using this platform for designing nature‐inspired confined reactors allowing for a deepened understanding of molecular confinement effects in living subcellular compartments.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

et al. 2019

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“…More commonly, researchers [96][97][98] have tended to use the coefficient of determination to evaluate the quality of curve fitting. The value of R 2 ranges from 0 to 1, indicating the goodness of the model fit.…”

Section: Evaluation Of the Best-fit Parametersmentioning

confidence: 99%

A critical review of the model fitting quality and parameter stability of equilibrium adsorption models

Peng

Nguyen

Wang

et al. 2018

Advances in Colloid and Interface Science

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We reviewed eight commonly used equilibrium adsorption models and examined their underlying assumptions, fitting qualities, and parameter stabilities. We compared several objective functions that have been applied to curve fitting analysis and a few statistics tests that have been performed to evaluate regression quality. The iteratively reweighted least squares algorithm was selected as the most suitable regression method for adsorption models in the presence of heteroscedasticity. The fraction of unexplained variance was selected to indicate the model fitting quality. Two sources of parameter instability were identified: residue instability and function instability. While the definition of the instability caused by residue is well established, we are the first to consider the instability caused by an adsorption model. The models discussed in this article can be applied to many surfactants, such as normal alcohols, polyglycol ethers, and sodium dodecyl sulfate at different salt concentrations. Our results show that both the model fitting quality and parameter instability increase with the number of parameters subject to curve fitting. For the Frumkin-type of reorientation model, the parameter instability can be as high as 25%. The high degree of instability in some complicated adsorption models may invalidate the estimated parameters.Therefore, additional measurements or simulations are required for complicated models to extract reliable model parameters.

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“…Additional physicochemical analyses on the basis of the surface tension data were carried out using the Szyszkowski equation [27]:γSz=γ0·][1−BSz·lncASz+1 where A Sz and B Sz are the coefficients of Szyszkowski equation.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Surface and Antimicrobial Activity of New Lactose-Based Surfactants

et al. 2019

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This work presents a synthesis method for new surfactants based on lactose. The compounds obtained belong to the homologous series of O-β-D-Galactopyranosyl-(1→4)-N-alkyl-(3-sulfopropyl)-D-glucosamine hydrochloride, containing 12 and 14 carbon atoms in the alkyl chain, and they may serve as an example of cationic surfactants. The newly synthesized compounds exhibit good surface properties, low value of CMC (Critical Micelle Concentration) and good wetting properties. These surfactants’ ability to produce foam is considerably higher than in the commercial surfactants. Moreover, antibacterial and fungistatic activity was carried out by well diffusion assay against the selected bacteria (Staphylococcus aureus, Bacillus subtilis, Escherichia coli and Pseudomonas aeruginosa), yeasts (Candida albicans) and filamentous fungi (Fusarium graminearum, F. avenaceum, F. oxysporum, F. culmorum, F. equiseti, Alternaria alternata and Botrytis cinerea). It was shown that the resulting quaternary salts significantly inhibit the growth of tested microorganisms. Antibacterial and fungistatic activity of the surfactant compounds varied depending on the species of bacteria or fungi. The results of antimicrobial activity of new lactose derivatives indicate that the compounds exhibit larger or similar antagonistic activity against tested bacteria and fungi than typical cationic surfactant cetylpyridinium chloride.

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A Linear Diffusion Model of Adsorption Kinetics at Fluid/Fluid Interfaces

Cited by 14 publications

References 44 publications

Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

Printing Life‐Inspired Subcellular Scale Compartments with Autonomous Molecularly Crowded Confinement

A critical review of the model fitting quality and parameter stability of equilibrium adsorption models

Synthesis, Surface and Antimicrobial Activity of New Lactose-Based Surfactants

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