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Colloids and Interfaces
Special Issues
Ten Years Without Nikola Kallay
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Ten Years Without Nikola Kallay

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

Deadline for manuscript submissions: closed (20 June 2025) | Viewed by 2199

Special Issue Editors

Dr. Johannes Lützenkirchen

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Guest Editor
Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
Interests: surface complexation; adsorption from aqueous solution; environmental chemistry; geochemistry; aquatic chemistry; colloid and interface science
Prof. Dr. Tajana Begović

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Guest Editor
Department of Chemistry, Division of Physical Chemistry, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
Interests: colloid and interfacial chemistry; electrical interfacial layer; adsorption; thermochemistry
Prof. Dr. Davor Kovačević

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Guest Editor
Department of Chemistry, Division of Physical Chemistry, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
Interests: physical chemistry of macromolecules; polyelectrolyte multilayers; polyelectrolyte complexes; colloid and interfacial chemistry; adsorption

Special Issue Information

Dear Colleagues,

In 2015, Nikola Kallay unexpectedly passed away at the age of 72. He had retired from the official positions he held at the University of Zagreb, Faculty of Science, in Croatia’s capital and was looking forward to diving into laboratory endeavors with this newfound freedom.

Prof. Kallay had an interesting practical course, where he allowed interested students to work on somewhat risky topics. The tasks required the students to dig into some hotly debated scientific issues or do try something completely new, for example. The outcomes of these practical courses often lead to new research lines in the years to follow.

The present Special Issue is intended to give friends and collaborators the platform to remind the scientific community of their relationship to Niki and to share some unconventional or unexpected results just in the spirit of Niki’s scientific view.

Dr. Johannes Lützenkirchen
Prof. Dr. Tajana Begović
Prof. Dr. Davor Kovačević
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.

Keywords

  • interfaces
  • surface potential
  • zeta-potential
  • adsorption
  • aggregation
  • thermodynamics

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Published Papers (4 papers)

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Research

12 pages, 2456 KB  
Article
Drying Molybdate/Iron Hydroxide Interface Leading to Both Inner- and Outer-Sphere Surface Complexes Depending on Initial Concentrations
by Romain Botella and Grégory Lefèvre
Colloids Interfaces 2025, 9(5), 59; https://doi.org/10.3390/colloids9050059 - 5 Sep 2025
Viewed by 229
Abstract
Drying is ubiquitous. However, its influence on surface speciation has been seldom studied. Through an in situ Attenuated Total Reflection–Infrared (ATR-IR) spectroscopy analysis of the drying of molybdate solutions on a lepidocrocite particle film, the change in surface speciation is followed. No formation [...] Read more.
Drying is ubiquitous. However, its influence on surface speciation has been seldom studied. Through an in situ Attenuated Total Reflection–Infrared (ATR-IR) spectroscopy analysis of the drying of molybdate solutions on a lepidocrocite particle film, the change in surface speciation is followed. No formation polymolybdates nor precipitate are observed upon drying at pH 8. An in situ washing of the dried solid/solution interface unveils the existence of surface outer-sphere and inner-sphere complexes. Decreasing the molybdate concentration highlights a saturation effect of the surface upon drying. Moreover, the careful analysis of substrate IR bands showed non-uniform drying which is an important insight to understand dehydration chemistry. The remaining molybdate ions at the surface as inner-sphere complexes are present as binuclear monodentate complexes stabilized by sodium. Full article
(This article belongs to the Special Issue Ten Years Without Nikola Kallay)
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15 pages, 1643 KB  
Article
Towards Building a Unified Adsorption Model for Goethite Based on Variable Crystal Face Contributions: III Carbonate Adsorption
by Mario Villalobos and América Xitlalli Cruz-Valladares
Colloids Interfaces 2025, 9(4), 51; https://doi.org/10.3390/colloids9040051 - 18 Aug 2025
Viewed by 317
Abstract
Goethite, a ubiquitous Fe(III) oxyhydroxide mineral, typically occurs in very small particle sizes whose interfacial properties critically influence the fate and transport of ionic species in natural systems. The surface site density of synthetic goethite increases with particle size, resulting in enhanced adsorption [...] Read more.
Goethite, a ubiquitous Fe(III) oxyhydroxide mineral, typically occurs in very small particle sizes whose interfacial properties critically influence the fate and transport of ionic species in natural systems. The surface site density of synthetic goethite increases with particle size, resulting in enhanced adsorption capacity per unit area. In the first two parts of this study, we modeled the adsorption of protons, nitrate, As(V), Pb(II), Zn(II), and phosphate on goethite as a function of particle size, adsorbate concentration, pH, and ionic strength, using unified parameters within the CD-MUSIC framework. Here, we extend this work to characterize the interfacial behavior of carbonate in goethite suspensions, using a comprehensive dataset generated previously under both closed and open CO2 system conditions. Carbonate oxyanions, prevalent in geochemical environments, exhibit competitive and complexation interactions with other ions and mineral surfaces. Although a bidentate bridging surface carbonate complex has been successful in previous modeling efforts on goethite, we found that the size of the carbonate moiety is too small and would require extreme octahedron bending of the goethite’s singly coordinated sites to accommodate this type of binding. Here, we propose a novel complex configuration that considers structural, physicochemical, and spectroscopic evidence. Optimal unified affinity constants and charge distribution parameters for this complex simulated all experimental data successfully, providing further validation of the CD-MUSIC model for describing relevant goethite/aqueous interfacial reactions. Full article
(This article belongs to the Special Issue Ten Years Without Nikola Kallay)
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Graphical abstract

18 pages, 19925 KB  
Article
The Precipitation of Calcium Carbonate in the Presence of Macromolecules Isolated from Corals
by Jasminka Kontrec, Nives Matijaković Mlinarić, Damir Kralj, Giuseppe Falini, Atiđa Selmani, Stefano Goffredo and Branka Njegić Džakula
Colloids Interfaces 2025, 9(4), 50; https://doi.org/10.3390/colloids9040050 - 15 Aug 2025
Viewed by 428
Abstract
This study investigated the CaCO3 spontaneous precipitation in the presence of soluble organic macromolecules (SOMs) extracted from the skeleton of Mediterranean colonial coral species, symbiotic Cladocora caespitosa (SOM-CCA) and asymbiotic Astroides calycularis (SOM-ACL). This approach was used as a model to explore [...] Read more.
This study investigated the CaCO3 spontaneous precipitation in the presence of soluble organic macromolecules (SOMs) extracted from the skeleton of Mediterranean colonial coral species, symbiotic Cladocora caespitosa (SOM-CCA) and asymbiotic Astroides calycularis (SOM-ACL). This approach was used as a model to explore biomineralization processes in marine organisms. The research was conducted in systems without or with the addition of Mg2+ (Mg/Ca molar ratio was 5:1) and/or SOMs (concentration range was 0.5–4 ppm). In the model system (system without Mg2+ or SOMs), only vaterite spherulites precipitated, while in the system with added Mg2+, only aragonite irregular aggregates were observed. Although the addition of SOMs did not influence the polymorphic composition of the CaCO3 precipitates, it led to noticeable changes in induction time and morphology of CaCO3 crystals, and these effects were stronger in the presence of SOM-ACL. By comparing systems containing both Mg2+ and SOM with the model system as well as with systems where Mg2+ or SOMs were added individually, the dominant role of Mg2+ in the aragonite formation was observed. However, the combined effect of Mg2+ and both SOMs enhanced the inhibition of CaCO3 precipitation. This inhibitory effect was particularly enhanced in the system combining Mg2+ and SOM-ACL. Full article
(This article belongs to the Special Issue Ten Years Without Nikola Kallay)
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Graphical abstract

32 pages, 3594 KB  
Article
Interaction of SBA-15 with Dilute Acetic Acid and Ammonia
by Marta Kalbarczyk, Sebastian Skupiński, Daniel Kamiński and Marek Kosmulski
Colloids Interfaces 2025, 9(3), 39; https://doi.org/10.3390/colloids9030039 - 15 Jun 2025
Viewed by 593
Abstract
The SAXS pattern and pore volume of SBA-15 are not affected by aging SBA-15 with water, dilute acetic acid, and ammonia up for to 1 month, while the specific surface area is substantially depressed in interactions with basic solutions. The SEM images indicate [...] Read more.
The SAXS pattern and pore volume of SBA-15 are not affected by aging SBA-15 with water, dilute acetic acid, and ammonia up for to 1 month, while the specific surface area is substantially depressed in interactions with basic solutions. The SEM images indicate pits on the side surfaces of SBA-15 particles in interactions with basic solutions. Aging of SBA-15 in ammonia solutions results in cavities formed by the collapse of walls between neighboring hexagonal channels in the SBA-15. This phenomenon is discussed with a special emphasis on its possible effect on the potentiometric titration curves. Especially, a standard procedure, in which the SSA measured before the titration is used to calculate the σ0, is compared with a modified procedure, in which the SSAs measured before and after the titration are used to estimate the SSA for each data point separately. Full article
(This article belongs to the Special Issue Ten Years Without Nikola Kallay)
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