Special Issue "Surfactants at Interfaces and Thin Liquid Films"

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Processing and Metallurgy".

Deadline for manuscript submissions: 31 October 2019.

Special Issue Editors

Dr. Jan Zawala
E-Mail Website1 Website2
Guest Editor
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Krakow, Poland
Interests: surface chemistry; colloids systems; liquid films; coalescence; bubble attachment; hydrophobicity; adsorption; adhesion; multiphase flow; mass transfer; image analysis
Dr. Przemyslaw B. Kowalczuk
E-Mail Website
Guest Editor
Department of Geoscience and Petroleum, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Interests: mineral processing; minerals engineering; flotation; physicochemistry of surfaces; colloids systems; hydrophobicity; minerals; surface properties; extractive metallurgy; leaching
Special Issues and Collections in MDPI journals
Dr. Dominik Kosior
E-Mail Website
Guest Editor
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Krakow, Poland
Interests: physicochemistry of colloids; thin liquid films; wetting phenomena; self-assembly at liquid/solid interfaces

Special Issue Information

Dear Colleagues,

Thin liquid films, stabilized by surfactant adsorption layers, are the fundamental building blocks of any dispersed system with a liquid continuous phase. The stability of liquid films is a parameter of crucial importance for the properties of the dispersed system as a whole. Moreover, it controls the outcome of many important technological and industrial applications involving multiphase flows. One of the important examples of such processes is flotation separation, where the collision of gas bubbles with various interfaces, in the presence of reagents creating a favorable chemical environment, are the first fundamental step of the formation of bubble-particle aggregates and foam. We warmly invite you to contribute to the Special Issue “Surfactants at Interfaces and Thin Liquid Films”. Given the scientific scope of the journal, the topics of interest of this Special Issue should include the original papers related to basic and applied research on the physicochemical aspects of the flotation separation process, such as experimental and theoretical studies on the stability of liquid films (foam and wetting) under static and dynamic conditions, the kinetics of bubble attachment to solid surfaces, solid surface wettability, surfactant adsorption, bubble and drop interfaces, and the hydrodynamics of bubbles and drops in surfactant solution.

Dr. Jan Zawala
Dr. Przemyslaw B. Kowalczuk
Dr. Dominik Kosior
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 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. Minerals 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 1400 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

  • liquid films
  • flotation
  • bubble attachment
  • surfactants
  • interface
  • wettability
  • particle
  • bubble

Published Papers (1 paper)

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Research

Open AccessArticle
The Effect of the Ionic Strength of Process Water on the Interaction of Talc and CMC: Implications of Recirculated Water on Floatable Gangue Depression
Minerals 2019, 9(4), 231; https://doi.org/10.3390/min9040231 - 15 Apr 2019
Abstract
Previous studies speculate that hydroxo species present in flotation pulps at pH > 9, particularly those of polyvalent cations, selectively adsorb onto gangue minerals. Such species supposedly enhance the depressive action of carboxymethyl cellulose (CMC) onto gangue via an acid-base interaction between the [...] Read more.
Previous studies speculate that hydroxo species present in flotation pulps at pH > 9, particularly those of polyvalent cations, selectively adsorb onto gangue minerals. Such species supposedly enhance the depressive action of carboxymethyl cellulose (CMC) onto gangue via an acid-base interaction between the positively charged mineral surface and the negatively charged CMC molecule. Thus, the hydrophilicity of gangue minerals is enhanced, preventing the dilution of the concentrate. However, as there is little evidence to support these claims for complex process waters of increasing ionic strength, it is important to investigate. Adsorption data and mineral surface charge analyses provide a fundamental understanding of how electrolytes and their ionic strengths affect gangue mineral-depressant adsorption. It is strongly anticipated that decoupling these effects will allow process operators to tailor their process water quality needs towards best flotation operating regimes and, in the long run, effect closed water circuits. Thus, using talc as a proxy for naturally floatable gangue common in sulfidic Cu–Ni–PGM ores, this work investigates the influence of the ionic strength of process water on the adsorption of CMC onto talc for a perspective on how saline water in sulfidic ores would affect the behavior and therefore management of floatable gangue. In the presence of CMC, the microflotation results showed that the rate of talc recovery decreased with increasing ionic strength of process water. Increases in ionic strength resulted in an increase in the adsorption of CMC onto talc. Talc particles proved to have been more coagulated at higher ionic strength since the settling time decreased with increasing ionic strength. Furthermore, the zeta potential of talc particles became less negative at higher ionic strengths of process water. It is thus proposed that increases in the ionic strength of process water increased the zeta potential of talc particles, enhancing the adsorption of CMC onto talc. This in turn created a more coagulated nature on talc particles, increasing their hydrophilicity and thereby retarding floatability. Full article
(This article belongs to the Special Issue Surfactants at Interfaces and Thin Liquid Films)
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