Special Issue "Thin Liquid Films and Dispersed Systems–from Fundamentals to Applications"

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: 31 December 2019.

Special Issue Editor

Guest Editor
Dr. Stoyan Karakashev Website E-Mail
Sofia University “St. Kliment Ohridski”
Interests: thin liquid films; wetting; foams; emulsions; ion-specific effects; surfactants; smart systems

Special Issue Information

Dear Colleagues,

Thin liquid films control the stability of foams, emulsions, and suspensions as their basic structural units. Flotation froths and other complex fluids used in the industry depend significantly on the wetting films between the particles and the bubbles/oil droplets. The rheological behavior of food colloids and blood stream depends on the stability of the thin liquid films between the soft particles. Therefore, this Special Issue aims at covering all the fundamental and industrial aspects related to thin liquid films, foams, emulsions, and complex fluids.

Specifically, the issue will cover works on:

  • Surfaces forces in thin liquid films;
  • Hydrodynamics of thin liquid films;
  • Capillary phenomena in thin liquid films;
  • Ion-specific effects in thin liquid films;
  • Thin wetting films and wetting phenomena;
  • Surfactant adsorption layers;
  • Foam drainage and rheology of foams;
  • “Smart” foams and emulsions;
  • Industrial and medical applications of complex fluids based on thin liquid films.

Thus designed, the Special Issue aims at introducing the readers to the fundamentals of the thin liquid films, foams, and emulsions and their industrial applications.

Dr. Stoyan Karakashev
Guest Editor

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 papers will be 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. Coatings is an international peer-reviewed open access monthly 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.

Keywords

  • Thin liquid films
  • Foams and emulsions
  • Surface phenomena
  • Surface Forces
  • Wetting phenomena
  • Flotation of mineral particles
  • Industrial applications of foams and emulsions

Published Papers (1 paper)

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Research

Open AccessFeature PaperArticle
Influence of the Hamaker Constant on the Value of the Critical Thickness of Foam Films
Coatings 2019, 9(9), 576; https://doi.org/10.3390/coatings9090576 - 10 Sep 2019
Abstract
The aim of the present study was to check the influence of the Hamaker constant (A(h)) on the calculated critical thickness of foam films. It was done by a comparison between the experimental data of the critical thickness and the theoretically obtained data [...] Read more.
The aim of the present study was to check the influence of the Hamaker constant (A(h)) on the calculated critical thickness of foam films. It was done by a comparison between the experimental data of the critical thickness and the theoretically obtained data with different values of (A(h)), which take part in the equations of Radoev, Scheludko, Manev, and Vrij. We calculated the latter for film thicknesses from 15 to 70 nm based on several equations. We used the experimental data of hcr (average value of critical thickness and measured once, in the place of a spot appearance) for foam films stabilized by non-ionic surfactant n-dodecyl-β-D-maltoside (C12G2) or by cationic surfactant n-dodecyl trimethylammonium bromide (C12TAB), as measured by the interferometric method. The foam films were produced from solutions with surfactant concentration at CMC (Critical Micelle Concentration) in the presence of 0.1 M NaBr. For films of C12G2, the best correspondence was found between measured hcr (in the spot) and calculated ones by the RShM equation using effective A(h) (introduced by Coons et al.) or Vassilieff’s values, but with a correction for the added electrolyte. For films stabilized by C12TAB, a difference between the measured and theoretically calculated hcr was found, which was probably due to the nature of the surfactant. Nevertheless, this difference was smallest when calculated hcr values were obtained with data for Aeff (h) and Vassilieff’s A(h) constant, respectively. Full article
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