Special Issue "Ion Specific Effects in Colloid and Surface Science – Where Biology, Chemistry and Physics Meet"

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

Deadline for manuscript submissions: 30 April 2020.

Special Issue Editor

Dr. István Szilágyi
E-Mail Website
Guest Editor
Department of Physical Chemistry and Materials Science, Faculty of Science and Informatics, University of Szeged, 1 Rerrich Béla tér, 6720 Szeged, Hungary
Interests: nanoparticle; polyelectrolyte; biocatalysis; ionic liquid; colloidal stability
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Special Issue Information

Dear Colleagues,

Ion specificity in colloidal and macromolecular systems has attracted widespread attention in the scientific community since the effect of different salts on the stability of protein solutions was discovered by Franz Hofmeister more than a century ago. Since then, the colloid behavior of biological, environmental, and industry-related systems has been comprehensively studied to understand the behavior of ions of different chemical compositions and valences at various interfaces. Due to the widespread contemporary interest in this topic in the scientific and technological communities, major efforts are being made to investigate the fundamental properties of colloids and surfaces, which can be tuned by different ionic environments.

The goal of this Special Issue is to discuss the most recent results concerning the ion-specific effects on the physico-chemical properties of interfaces. Topics of interest include, but are not limited to, the following:

  • Specific adsorption of ions at solid/liquid, liquid/liquid, and liquid/air interfaces;
  • Surface forces across electrolyte solutions of different compositions;
  • Particle aggregation processes in salt solutions;
  • Interaction of ions with macromolecules;
  • Interfacial behavior of ionic liquid constituents;
  • Ion specificity in biological systems;
  • Role of electrolytes in environmental processes;
  • Influence of salt ions on the efficiency of separation techniques;
  • Theoretical approaches to investigate ion-specific effects.

Fundamental properties of colloidal systems in the presence of multivalent ions.

Dr. István Szilágyi
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. Colloids and Interfaces is an international peer-reviewed open access quarterly 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 1000 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

  • Ion-specific effect
  • Hofmeister series
  • Schulze–Hardy rule
  • aggregation, surface force
  • hydration of ions
  • adsorption
  • colloidal stability
  • ionic liquid
  • protein denaturation

Published Papers (2 papers)

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Research

Open AccessArticle
Mechanisms of Surface Charge Modification of Carbonates in Aqueous Electrolyte Solutions
Colloids Interfaces 2019, 3(4), 62; https://doi.org/10.3390/colloids3040062 - 31 Oct 2019
Abstract
The influence of different types of salts (NaCl, CaCl 2 , MgCl 2 , NaHCO 3 , and Na 2 SO 4 ) on the surface characteristics of unconditioned calcite and dolomite particles, and conditioned with stearic acid, was investigated. This study used [...] Read more.
The influence of different types of salts (NaCl, CaCl 2 , MgCl 2 , NaHCO 3 , and Na 2 SO 4 ) on the surface characteristics of unconditioned calcite and dolomite particles, and conditioned with stearic acid, was investigated. This study used zeta potential measurements to gain fundamental understanding of physico-chemical mechanisms involved in surface charge modification of carbonate minerals in the presence of diluted salt solutions. By increasing the salt concentration of divalent cationic salt solution (CaCl 2 and MgCl 2 ), the zeta potential of calcite particles was altered, resulting in charge reversal from negative to positive, while dolomite particles maintained positive zeta potential. This is due to the adsorption of potential-determining cations (Ca 2 + and Mg 2 + ), and consequent changes in the structure of the diffuse layer, predominantly driven by coulombic interactions. On the other hand, chemical adsorption of potential-determining anions (HCO 3 and SO 4 2 ) maintained the negative zeta potential of carbonate surfaces and increased its magnitude up to 10 mM, before decreasing at higher salt concentrations. Physisorption of stearic acid molecules on the calcite and dolomite surfaces changed the zeta potential to more negative values in all solutions. It is argued that divalent cations (Ca 2 + and Mg 2 + ) would result in positive and neutral complexes with stearic acid molecules, which may result in strongly bound stearic acid films, whereas ions resulting in negative mineral surface charges (SO 4 2 and HCO 3 ) will cause stearic acid films to be loosely bound to the carbonate mineral surfaces. The suggested mechanism for surface charge modification of carbonates, in the presence of different ions, is changes in both distribution of ions in the diffuse layer and its structure as a result of ion adsorption to the crystal lattice by having a positive contribution to the disjoining pressures when changing electrolyte concentration. This work extends the current knowledge base for dynamic water injection design by determining the effect of salt concentration on surface electrostatics. Full article
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Open AccessArticle
Fabrication of Mesoporous NaZrP Cation-Exchanger for U(VI) Ions Separation from Uranyl Leach Liquors
Colloids Interfaces 2019, 3(4), 61; https://doi.org/10.3390/colloids3040061 - 08 Oct 2019
Abstract
As the demand for uranium production-based energy worldwide has been increasing in the last decades to maintain nuclear growth for electricity production, there are great efforts towards developing an easy and inexpensive method for uranium extraction and separation from its ores. For this [...] Read more.
As the demand for uranium production-based energy worldwide has been increasing in the last decades to maintain nuclear growth for electricity production, there are great efforts towards developing an easy and inexpensive method for uranium extraction and separation from its ores. For this purpose, mesoporous inorganic cation exchangers provide an efficient separation technology that can help streamline production and lower overall cost. This study describes the development of nano-structured mesoporous sodium zirconium phosphate (NaZrP-CEX) for separation and extraction of uranyl ions from real samples. The fabricated NaZrP-CEX was well characterized by various techniques such as X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Scanning Electron Microscope (SEM), N2 adsorption/desorption, Dynamic light scattering (DLS) and zeta potential). The kinetics/thermodynamic behaviors of uranyl ion adsorption into NaZrP-CEX from an aqueous solution were minutely studied. The kinetic studies showed that the pseudo-second order model gave a better description for the uptake process. The negative value of ΔG indicate high feasibility and spontaneity of adsorption. Finally, mesoporous NaZrP-CEX can be regenerated using both of HNO3 (0.05 M) or HCl (1 M) up to seven cycles of operation. Full article
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