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Colloids and Interfaces
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Exclusive Papers of the Editorial Board Members of Colloids and...
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Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2022

A special issue of Colloids and Interfaces (ISSN 2504-5377).

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 11556

Special Issue Editors

Dr. Reinhard Miller

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Guest Editor
Institute for Condensed Matter Physics, Technical University Darmstadt, D-64289 Darmstadt, Germany
Interests: dynamics and mechanics of liquid interfaces; thermodynamics of adsorption of surfactants and proteins; interfacial interactions and 2D rheology; stability of foams and emulsions
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Victor Starov

E-Mail Website
Guest Editor
Chemical Engineering Department, Loughborough University, Loughborough, UK
Interests: colloid and interface science; kinetics of wetting and spreading
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue of Colloids and Interfaces is dedicated to recent advances in the various research areas of colloids and interfaces and comprises a diverse selection of exclusive papers of the Editorial Board Members (EBMs) of this journal. It is a continuation of the recent successful activity in 2020. Once again, the focus of this Special Issue is on highlighting recent interesting investigations conducted in the laboratories of our journal’s EBMs. It represents our young journal as an attractive open access publishing platform for research in the field of colloids and interfaces. 

Dr. Reinhard Miller
Prof. Dr. Victor Starov
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Colloids and Interfaces is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Published Papers (5 papers)

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Research

12 pages, 2132 KiB  
Article
Direct Resolution of the Interactions of a Hydrocarbon Gas with Adsorbed Surfactant Monolayers at the Water/Air Interface Using Neutron Reflectometry
by Richard A. Campbell, Talmira Kairaliyeva, Svetlana Santer, Emanuel Schneck and Reinhard Miller
Colloids Interfaces 2022, 6(4), 68; https://doi.org/10.3390/colloids6040068 - 14 Nov 2022
Cited by 1 | Viewed by 1334
Abstract
We have directly resolved in the present work the interfacial composition during and after the interactions of a saturated atmosphere of oil vapor with soluble surfactant solutions at a planar water/air interface for the first time. Experiments were conducted on interactions of hexane [...] Read more.
We have directly resolved in the present work the interfacial composition during and after the interactions of a saturated atmosphere of oil vapor with soluble surfactant solutions at a planar water/air interface for the first time. Experiments were conducted on interactions of hexane vapor with solutions of alkyltrimethylammonium bromides and sodium dodecyl sulfate to observe the balance between cooperativity and competition of the components at the interface. In all cases, hexane adsorption was strongly enhanced by the presence of the surfactant, even at bulk surfactant concentrations four orders of magnitude below the critical micelle concentration. Cooperativity of the surfactant adsorption was observed only for sodium dodecyl sulfate at intermediate bulk concentrations, yet for all four systems, competition set in at higher concentrations, as hexane adsorption reduced the surfactant surface excess. The data fully supported the complete removal of hexane from the interface following venting of the system to remove the saturated atmosphere of oil vapor. These results help to identify future experiments that would elaborate and could explain the cooperativity of surfactant adsorption, such as on cationic surfactants with short alkyl chains and a broader series of anionic surfactants. This work holds relevance for oil recovery applications with foam, where there is a gas phase saturated with oil vapor. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2022)
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15 pages, 2033 KiB  
Article
Drop Impact onto a Substrate Wetted by Another Liquid: Flow in the Wall Film
by Bastian Stumpf, Jeanette Hussong and Ilia V. Roisman
Colloids Interfaces 2022, 6(4), 58; https://doi.org/10.3390/colloids6040058 - 20 Oct 2022
Cited by 2 | Viewed by 1520
Abstract
The impact of a drop onto a liquid film is relevant for many natural phenomena and industrial applications such as spray painting, inkjet printing, agricultural sprays, or spray cooling. In particular, the height of liquid remaining on the substrate after impact is of [...] Read more.
The impact of a drop onto a liquid film is relevant for many natural phenomena and industrial applications such as spray painting, inkjet printing, agricultural sprays, or spray cooling. In particular, the height of liquid remaining on the substrate after impact is of special interest for painting and coating but also for applications involving heat transfer from the wall. While much progress has been made in explaining the hydrodynamics of drop impact onto a liquid film of the same liquid, the physics of drop impact onto a wall film with different material properties is still not well understood. In this study, drop impact onto a very thin liquid film of another liquid is investigated. The thickness of the film remaining on a substrate after drop impact is measured using a chromatic-confocal line sensor. It is interesting that the residual film thickness does not depend on the initial thickness of the wall film, but strongly depends on its viscosity. A theoretical model for the flow in the drop and wall film is developed which accounts for the development of viscous boundary layers in both liquids. The theoretical predictions agree well with the experimental data. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2022)
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10 pages, 1083 KiB  
Article
Why Is the Linearized Form of Pseudo-Second Order Adsorption Kinetic Model So Successful in Fitting Batch Adsorption Experimental Data?
by Margaritis Kostoglou and Thodoris D. Karapantsios
Colloids Interfaces 2022, 6(4), 55; https://doi.org/10.3390/colloids6040055 - 12 Oct 2022
Cited by 16 | Viewed by 2267
Abstract
There is a vast amount of literature devoted to experimental studies on adsorption from liquids examining the adsorption potential of various adsorbents with respect to various solutes. Most of these studies contain not only equilibrium but also kinetic experimental data. The standard procedure [...] Read more.
There is a vast amount of literature devoted to experimental studies on adsorption from liquids examining the adsorption potential of various adsorbents with respect to various solutes. Most of these studies contain not only equilibrium but also kinetic experimental data. The standard procedure followed in the literature is to fit the kinetic experimental adsorption data to some models. Typically empirical models are employed for this purpose and among them, the pseudo-first and pseudo-second order kinetic models are the most extensively used. In particular, the linear form of their integrated equations is extensively employed. In most cases, it is found that the pseudo-second order model is not only better than other models but also leads to high fitting quality. This is rather strange since there is no physical justification for such a model, as it is well accepted that adsorption kinetics is dominated by a diffusion process. In the present work, it will be shown through examples and discussion that the success of the linearized pseudo-second order model in fitting the data is misleading. Specific suggestions on appropriate adsorption data treatment are given. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2022)
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13 pages, 1846 KiB  
Article
Relevance of Colloid Inherent Salt Estimated by Surface Complexation Modeling of Surface Charge Densities for Different Silica Colloids
by Alok Goel and Johannes Lützenkirchen
Colloids Interfaces 2022, 6(2), 23; https://doi.org/10.3390/colloids6020023 - 06 Apr 2022
Cited by 2 | Viewed by 2591
Abstract
Potentiometric titrations have been routinely used to measure the proton-related surface charge density (SCD) of particles in solution. Here, we quantify the SCD of silica nanoparticles (NPs) that are commercially available as charge-stabilized colloids (by the addition of NaOH) in the presence of [...] Read more.
Potentiometric titrations have been routinely used to measure the proton-related surface charge density (SCD) of particles in solution. Here, we quantify the SCD of silica nanoparticles (NPs) that are commercially available as charge-stabilized colloids (by the addition of NaOH) in the presence of known amounts of added NaCl. The experimental results are simulated by surface complexation models (SCMs) of the electrical double layer (EDL). The modeling results suggest that involving only the added NaCl electrolyte yields poor agreement between the experiment and the best achievable fit. An increase in the Na concentration accounting for the colloid inherent salt (CIS) associated with these charge-stabilized colloids results in much better simulations. In the available literature, this CIS has often been disregarded. However, in the modeling, the total concentration of Na must be known for a consistent mole balance and derivation of reliable ion-pair binding constants. If the CIS is not accounted for or the original suspensions are not dialyzed, the presence of CIS renders the study of those colloids difficult, particularly when investigating specific ion effects, since the CIS always interferes. In the present work, we show that the SCM-estimated amount of CIS from varying the total salt and solid concentration agrees surprisingly well with the manufacturer specification. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2022)
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13 pages, 2195 KiB  
Article
Polymeric Surfactant P84/Polyoxometalate α-PW12O403−—A Model System to Investigate the Interplay between Chaotropic and Hydrophobic Effects
by Philipp Schmid, Xaver Graß, Pratap Bahadur, Isabelle Grillo, Olivier Diat, Arno Pfitzner and Pierre Bauduin
Colloids Interfaces 2022, 6(1), 16; https://doi.org/10.3390/colloids6010016 - 01 Mar 2022
Cited by 5 | Viewed by 3131
Abstract
Low charge density nanometric ions were recently shown to bind strongly to neutral hydrated matter in aqueous solution. This phenomenon, called the (super-)chaotropic effect, arises from the partial dehydration of both the nano-ion and the solute, leading to a significant gain in enthalpy. [...] Read more.
Low charge density nanometric ions were recently shown to bind strongly to neutral hydrated matter in aqueous solution. This phenomenon, called the (super-)chaotropic effect, arises from the partial dehydration of both the nano-ion and the solute, leading to a significant gain in enthalpy. Here, we investigate the chaotropic effect of the polyoxometalate α-PW12O403− on the triblock copolymer P84: (EO)19(PO)43(EO)19 with (EO)19 the polyethoxylated and (PO)43 the polypropoxylated chains. The combination of phase diagrams, spectroscopic (nuclear magnetic resonance) and scattering (small angle neutron/X-ray scattering) techniques revealed that: (i) below the micellization temperature of P84, PW12O403− exclusively binds to the propylene oxide moiety of P84 unimers; and (ii) above the micellization temperature, PW12O403− mostly adsorbs on the ethylene oxide micellar corona. The preferential binding of the PW12O403− to the PPO chain over the PEO chains suggests that the binding is driven by the chaotropic effect and is reinforced by the hydrophobic effect. At higher temperatures, copolymer micellization leads to the displacement of PW12O403− from the PPO chain to the PEO chains. This study deepens our understanding of the subtle interplay between the chaotropic and hydrophobic effects in complex salt-organic matter solutions. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2022)
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