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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 2024–2025

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

Deadline for manuscript submissions: 31 December 2025 | Viewed by 9811

Special Issue Editors

Dr. Reinhard Miller

E-Mail Website
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. Ramón G. Rubio

E-Mail Website
Guest Editor
Instituto Pluridisciplinar, Universidad Complutense, 28040 Madrid, Spain
Interests: interfacial rheology; microrheology; vesicles; liposomes and nanocapsules; polyelectrolyte and surfactant mixtures; adsorption at interfaces; Pickering emulsions

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. 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. Ramón G. Rubio
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

  • colloidal systems
  • interfacial properties
  • self-assembling phenomena
  • fluid dynamics and multiphase flows
  • applications of colloids and interfaces

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Further information on MDPI's Special Issue policies can be found here.

Related Special Issues

Published Papers (5 papers)

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Research

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15 pages, 7577 KiB  
Article
Experimental Investigation of Stability of Emulsions Produced by Catastrophic Phase Inversion Using Non-Ionic Surfactants
by Maria Doutsi, Maria C. Vlachou, Christos Koukiotis, Margaritis Kostoglou and Thodoris D. Karapantsios
Colloids Interfaces 2025, 9(1), 6; https://doi.org/10.3390/colloids9010006 - 16 Jan 2025
Viewed by 1680
Abstract
Emulsions stabilized by environmentally friendly surfactants have been at the center of research attention over recent decades. Non-ionic surfactants with good biodegradability, while being non-toxic and non-irritating, have dominated in this area. For a chosen system, the main goal is to engineer its [...] Read more.
Emulsions stabilized by environmentally friendly surfactants have been at the center of research attention over recent decades. Non-ionic surfactants with good biodegradability, while being non-toxic and non-irritating, have dominated in this area. For a chosen system, the main goal is to engineer its properties for smaller droplet sizes and better stability, a process which is mainly derived from the emulsification method. In the present study, Ethylan 1005 and Ethylan 1008 were used as stabilizers, both alone and combined at different ratios, in eco-friendly emulsions produced by paraffin oil and Millipore water, via direct emulsification, catastrophic phase inversion and catastrophic phase inversion in droplets. During the experiments, the emulsions’ rheological behavior, phase separation, and droplet size distribution profiles were measured. Catastrophic phase inversion in droplets resulted in the finest droplet size distributions for both emulsifiers when used alone. As the concentration of Ethylan 1008 increased from 0% to 100% in the surfactant mixtures, the droplets’ mean diameter and range also increased, indicting degradation of emulsion stability. However, phase separation tests revealed the opposite. Explanation was found in the chemical structure of the two emulsions and the steric phenomena caused by this, while a semi-quantitative analysis of these trends was also developed. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2024–2025)
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16 pages, 2729 KiB  
Article
Polyelectrolyte-Surfactant Mixture Effects on Bulk Properties and Antibacterial, Cytotoxic Activity of Fine Sulfur Particles
by Seitzhan Turganbay, Saule Aidarova, Assem Issayeva, Zhanar Iskakbayeva, Aitugan Sabitov, Gulsinay Turganbay and Alpamys A. Babayev
Colloids Interfaces 2024, 8(6), 65; https://doi.org/10.3390/colloids8060065 - 28 Nov 2024
Viewed by 1134
Abstract
Elemental sulfur, commonly known for its wide range of biological activities, has a long history of use in protecting all garden and vegetable crops from a range of pests and diseases, including powdery mildew, ascochyta blight, clubroot, plant mites, oidium, anthracnose, and scab. [...] Read more.
Elemental sulfur, commonly known for its wide range of biological activities, has a long history of use in protecting all garden and vegetable crops from a range of pests and diseases, including powdery mildew, ascochyta blight, clubroot, plant mites, oidium, anthracnose, and scab. In the present study, a quick and environmentally friendly approach has been developed for the synthesis of sulfur nanoparticles with antibacterial activity. Fine sulfur particles (FSPs) were prepared by modifying the surface of elemental sulfur using various polyelectrolyte–surfactant mixtures (PSMs) including sodium carboxymethyl cellulose–sodium dodecylbenzene sulfonate (NaCMC-SDBS) and polyhexamethylene guanidine hydrochloride–cetyltrimethylammonium bromide (PHMG-CTAB). The FSPs were characterized by UV–visible spectrophotometry, X-ray diffraction (XRD), thermogravimetric/differential scanning calorimetry analysis (TG/DSC), and scanning electron microscopy (SEM), with the FSPs showing an almost spherical shape with an average size in the range of 150–200 nm. The antibacterial activity of the FSPs was tested against Gram-positive Staphylococcus aureus and Enterococcus faecium and Gram-negative Escherichia coli and Pseudomonas aeruginosa bacteria and one fungus (Aspergillus brasiliensis ATCC 95 16404). Based on this, it could be seen that FSPs exhibited significant antimicrobial activity against Gram-positive bacteria, i.e., S. aureus and E. faecium. The in vitro cytotoxicity of the FSPs-1 and FSPs-2 studied in normal (MeT-5A) and tumorous (MCF-7) human cell lines was assessed in the concentration range from 500 μg/mL to 0.12 mg/mL, from which it was determined as being non-cytotoxic. The received products can be considered for potential application in agriculture and medicine. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2024–2025)
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13 pages, 2852 KiB  
Article
Dynamic Interfacial Properties and Foamability of DoTAB/SiO2 Mixtures
by Fariza Amankeldi, Maratbek Gabdullin, Miras Issakhov, Zhanar Ospanova, Altynay Sharipova, Saule Aidarova and Reinhard Miller
Colloids Interfaces 2024, 8(2), 19; https://doi.org/10.3390/colloids8020019 - 11 Mar 2024
Cited by 2 | Viewed by 1788
Abstract
The interaction between nanoparticles and cationic surfactants is an exciting and emerging field in interfacial science. This area of research holds significant promise, linking fundamental principles to practical applications in a variety of industries, including chemical processes, biomedical applications and the petroleum industry. [...] Read more.
The interaction between nanoparticles and cationic surfactants is an exciting and emerging field in interfacial science. This area of research holds significant promise, linking fundamental principles to practical applications in a variety of industries, including chemical processes, biomedical applications and the petroleum industry. This study explores the interaction between dodecyltrimethylammonium bromide (DoTAB) and silica (SiO2) nanoparticles, investigating their influence on dynamic interfacial properties and foam characteristics. Through equilibrium and dynamic surface tension measurements, along with examining the dilational visco-elasticity behavior, this research reveals the complex surface behavior of DoTAB/SiO2 mixtures compared to individual surfactant solutions. The foamability and stability experiments indicate that the addition of SiO2 significantly improves the foam stability. Notably, stable foams are achieved at low SiO2 concentrations, suggesting a cost-effective approach to enhancing the foam stability. This study identifies the optimal stability conditions for 12 mM DoTAB solutions, emphasizing the crucial role of the critical aggregation concentration region. These findings offer valuable insights for designing surfactant-nanoparticle formulations to enhance foam performance in various industrial applications. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2024–2025)
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13 pages, 5109 KiB  
Article
Approximation of Any Particle Size Distribution Employing a Bidisperse One Based on Moment Matching
by Margaritis Kostoglou and Thodoris D. Karapantsios
Colloids Interfaces 2024, 8(1), 7; https://doi.org/10.3390/colloids8010007 - 4 Jan 2024
Cited by 2 | Viewed by 2085
Abstract
Dispersed phases like colloidal particles and emulsions are characterized by their particle size distribution. Narrow distributions can be represented by the monodisperse distribution. However, this is not the case for broader distributions. The so-called quadrature methods of moments assume any distribution as a [...] Read more.
Dispersed phases like colloidal particles and emulsions are characterized by their particle size distribution. Narrow distributions can be represented by the monodisperse distribution. However, this is not the case for broader distributions. The so-called quadrature methods of moments assume any distribution as a bidisperse one in order to solve the corresponding population balance. The generalization of this approach (i.e., approximation of the actual particle size distribution according to a bidisperse one) is proposed in the present work. This approximation helps to compress the amount of numbers for the description of the distribution and facilitates the calculation of the properties of the dispersion (especially convenient in cases of complex calculations). In the present work, the procedure to perform the approximation is evaluated, and the best approach is found. It was shown that the approximation works well for the case of a lognormal distribution (as an example) for a moments order from 0 to 2 and for dispersivity up to 3. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2024–2025)
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Review

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16 pages, 3691 KiB  
Review
A Review of Investigations and Applications of Biocides in Nanomaterials and Nanotechnologies
by Assem Issayeva, Altynay Sharipova, Saule Aidarova, Galiya Madybekova, Jaroslav Katona, Seitzhan Turganbay and Reinhard Miller
Colloids Interfaces 2024, 8(3), 31; https://doi.org/10.3390/colloids8030031 - 16 May 2024
Cited by 3 | Viewed by 2332
Abstract
In recent years, the development of nanomaterials with biocidal properties has received considerable attention due to their potential applications in various industries, including food, medicine, and cultural heritage preservation. The growing demand for coatings with antibacterial properties has sparked interest from industrial sectors [...] Read more.
In recent years, the development of nanomaterials with biocidal properties has received considerable attention due to their potential applications in various industries, including food, medicine, and cultural heritage preservation. The growing demand for coatings with antibacterial properties has sparked interest from industrial sectors in exploring the incorporation of biocides into these materials. Coatings are prone to microbial growth, which can cause damage such as cracking, discoloration, and staining. To combat these problems, the integration of biocides into coatings is a crucial strategy. Biocide-embedded nanomaterials offer numerous advantages, including high efficiency in small quantities, ease of application, good chemical stability, low toxicity, and non-bioaccumulation. Encapsulated nanobiocides are particularly attractive to the agro-industry, because they can be less toxic than traditional biocides while still effectively controlling microbial contamination. To fully exploit the benefits of nanobiocides, future research should focus on optimizing their synthesis, formulation, and delivery methods. The purpose of this review is to summarize the current status of biocide nanomaterials, discuss potential future research directions, and highlight research methods, the development of new forms of nanomaterials, and studies of their physico-chemical properties. Biocide nanocapsules of DCOIT (4,5-Dichloro-2-octyl-2H-isothiazol-3-one) are chosen as an example to illustrate the research pathways. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2024–2025)
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