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Colloids and Interfaces
Special Issues
Bubble and Drop 2025 (B&D 2025)
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Bubble and Drop 2025 (B&D 2025)

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

Deadline for manuscript submissions: closed (15 January 2026) | Viewed by 7379

Special Issue Editors

Prof. Dr. Elena Mileva

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Guest Editor
Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 11, 1113 Sofia, Bulgaria
Interests: soft matter physics; complex fluids; surface forces and thin liquid films; bulk and interfacial rheology; amphiphilic self-assembly; biomedical and ecological aspects and applications of supramolecular structures in fluid media
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Tatiana Gambaryan-Roisman

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Guest Editor
Institute for Technical Thermodynamics and Center of Smart Interfaces, Department of Mechanical Engineering, Technische Universität Darmstadt, Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany
Interests: heat and mass transfer; phase change; interfacial flow and transport phenomena; complex wetting; thin liquid films; drop evaporation
Special Issues, Collections and Topics in MDPI journals
Dr. Pavlína Basařová

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague, Czech Republic
Interests: multiphase flows; bubble behaviour; surface phenomena; complex fluid; flotation
Special Issues, Collections and Topics in MDPI journals
Dr. Sandra Orvalho

E-Mail Website
Guest Editor
Institute of Chemical Process Fundamentals of the CAS, Rozvojová 1, 165 00 Prague, Czech Republic
Interests: hydrodynamic and mass transfer in multiphase systems; effect of surfactants of bubbly flows; coalescence; bubble columns
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

Special Issue Information

Dear Colleagues,

The 10th Bubble and Drop Conference (https://bd2025.vscht.cz) is an interdisciplinary meeting point and platform for expert discussion of the advances on the investigation of interfaces of bubbles, drops, foams, and emulsions, and their consequences in multiple multiphase applications, bridging fundaments of interfacial physics and industrial applications. The conference will cover the following six main topics:

T1: B&D—from single bodies to multiphase flows;

T2: Wetting, spreading and evaporation;

T3: Adsorption, interfacial dynamics and rheology;

T4: Foams, emulsions and liquid films;

T5: B&D in industrial applications;

T6: Special section “Drops in Artificial Life”.

In addition to an excellent scientific programme, you will discover the charm of Prague, a city known as the Baroque heart of Europe. Join us for a conference that promises an expert session in a city that effortlessly blends old and new. Participants of the 10th Bubble and Drop Conference are cordially invited to contribute original research papers or review papers to this Special Issue of Colloids and Interfaces.

Other submissions in this area are also welcome.

Prof. Dr. Elena Mileva
Prof. Dr. Tatiana Gambaryan-Roisman
Dr. Pavlína Basařová
Dr. Sandra Orvalho
Dr. Reinhard Miller
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 250 words) can be sent to the Editorial Office for assessment.

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 1700 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

  • multiphase flows
  • bubble behaviour
  • adsorption and wetting phenomena
  • surface forces, interfacial dynamics and rheology
  • engineered interfaces and smart nanostructured materials
  • foams, emulsions and liquid films
  • formulations and innovations for industrial applications

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Related Special Issues

Published Papers (5 papers)

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Research

12 pages, 2309 KB  
Article
Yeast-Based Pickering Emulsions: Is Yeast Truly the Stabilizing Agent?
by Carlotta Cappabianca, Daniele Marra, Irene Perna, Angeliki P. Chondrou, Ourania Oikonomidou, Maria Petala, Thodoris D. Karapantsios and Sergio Caserta
Colloids Interfaces 2026, 10(3), 43; https://doi.org/10.3390/colloids10030043 - 28 May 2026
Viewed by 136
Abstract
The increasing demand for sustainable and affordable surfactants requires the exploration of novel bio-based alternatives. In this context, this work investigates the potential of baker’s yeast (Saccharomyces cerevisiae) as a surface-active agent. To this purpose, the performance of commercial dry, commercial [...] Read more.
The increasing demand for sustainable and affordable surfactants requires the exploration of novel bio-based alternatives. In this context, this work investigates the potential of baker’s yeast (Saccharomyces cerevisiae) as a surface-active agent. To this purpose, the performance of commercial dry, commercial fresh, and cultivated yeast was evaluated by characterizing their wetting behavior and formulating emulsions with a fixed oil-to-water ratio. Microscopic and macroscopic stability was monitored over 24 h and quantified via the creaming index (CI). The experimental results demonstrate that both the yeast source and concentration significantly dictate the surface properties and emulsion stability. Notably, commercial dry yeast exhibited the highest degree of hydrophobicity, likely attributed to the presence of sorbitan monostearate (SMS) in the formulation. Consequently, this was the main variant capable of producing stable emulsions, with microscopic evidence suggesting a Pickering-like stabilization mechanism driven by the irreversible adsorption of yeast cells at the oil–water interface. Conversely, commercial fresh and cultivated yeast failed to exert significant stabilizing activity. These results demonstrate that S. cerevisiae biomass can be effectively repurposed as a functional constituent in green emulsion technology, offering a scalable pathway for the development of biocompatible, particle-stabilized industrial formulations. Full article
(This article belongs to the Special Issue Bubble and Drop 2025 (B&D 2025))
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16 pages, 1667 KB  
Article
Some Aspects of the Stability of Nanobubbles
by Ramonna I. Kosheleva, Agni A. Moutzouroglou, George Z. Kyzas and Athanasios Mitropoulos
Colloids Interfaces 2026, 10(3), 36; https://doi.org/10.3390/colloids10030036 - 28 Apr 2026
Viewed by 548
Abstract
The temporal dynamics and statistical properties of air nanobubbles (NBs) in ultrapure water were investigated using nanoparticle tracking analysis (NTA). Statistical analysis of NB lifetimes reveals a strong correlation between bubble size and persistence. The mean bubble diameter increases rapidly from ~100 nm [...] Read more.
The temporal dynamics and statistical properties of air nanobubbles (NBs) in ultrapure water were investigated using nanoparticle tracking analysis (NTA). Statistical analysis of NB lifetimes reveals a strong correlation between bubble size and persistence. The mean bubble diameter increases rapidly from ~100 nm for short-lived detections to a characteristic size of about 500 nm for bubbles surviving longer than 40 frames, after which the size remains approximately constant. The population of detected NBs decreases monotonically with increasing lifetime, approximately following an exponential decay. Temporal analysis of the cumulative population yields a scaling exponent of ~0.6, indicating correlated fluctuations rather than independent stochastic events. Spatial observations confirm that NBs are separated by micrometer-scale distances, excluding direct bubble–bubble interactions. The combined statistical and imaging results support a picture in which NBs behave as dynamically coupled gas domains embedded within localized dissolved-gas microenvironments. The observed non-monotonic population dynamics cannot be explained by irreversible dissolution alone. Instead, the data indicate that NBs undergo continuous cycles of dissolution and replenishment. Within this framework, localized gas micro-domains, potentially exhibiting non-extensive behaviour, evolve dynamically and act as transient reservoirs. Upon bubble disappearance, these regions persist and diffuse, while their interaction may locally restore conditions for nucleation. This mechanism provides a physically consistent explanation for the observed cyclic behaviour and the apparent persistence of NBs beyond classical predictions. Full article
(This article belongs to the Special Issue Bubble and Drop 2025 (B&D 2025))
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21 pages, 842 KB  
Article
Correlation Between Interfacial Parameters in Bead Packs: Contact Angle and Zeta Potential
by Tomislav Vukovic, Thomas Luxbacher, Jostein Røstad, Umer Farooq, Ole Torsæter and Antje van der Net
Colloids Interfaces 2026, 10(1), 19; https://doi.org/10.3390/colloids10010019 - 6 Feb 2026
Viewed by 874
Abstract
Wettability determination is of crucial importance for multiphase flow in porous media. Currently available methods are either applied to simplified geometries (sessile drop) or are time-consuming (Amott, USBM) and cost-intensive (micro-CT scanning). The purpose of this study is to systematically test the streaming [...] Read more.
Wettability determination is of crucial importance for multiphase flow in porous media. Currently available methods are either applied to simplified geometries (sessile drop) or are time-consuming (Amott, USBM) and cost-intensive (micro-CT scanning). The purpose of this study is to systematically test the streaming potential method as a fast, cheap, and in situ applicable method for surface probing and determination of the wetting state of soda lime glass beads through zeta potential. Different wetting states are achieved by means of silanization and are characterized by an average contact angle. Comparison of contact angles measured by sessile drop on plate geometries and contact angles derived from bead pack micro-CT images confirmed that the treatment is transferable to the bead packs. The correlation between the zeta potential of the single bead size packing with a single wetting state and the contact angle is non-unique over the entire range of tested treatment volume ratios. The contact angle plateaus at higher degrees of silanization, while the zeta potential values still change. Before the plateau, a correlation between contact angle and zeta potential is present. Zeta potential measurements on the mixtures of the same-sized beads with two different wetting states confirm the existing theory that the apparent zeta potential is a surface area-weighted average of constituents. For a mixture where the zeta potential is size dependent, a new correlation for a dual bead system was derived. The non-unique correlation between zeta potential and contact angle, combined with a bead size-dependent zeta potential, will limit the use of zeta potential for contact angle derivation for the system of soda lime glass beads with various silanization coatings used here. Monitoring relative changes of wetting conditions might still be possible. Full article
(This article belongs to the Special Issue Bubble and Drop 2025 (B&D 2025))
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9 pages, 7852 KB  
Article
A Point-of-Care Diagnostic Method Using Desiccation Patterns of Blood Sessile Droplets
by Hui He, Lujia Xuan, Yihe Lin, Min Zhang, Junjie Mou and Ruoyang Chen
Colloids Interfaces 2025, 9(3), 35; https://doi.org/10.3390/colloids9030035 - 10 Jun 2025
Viewed by 1511
Abstract
The evaporation of a blood sessile droplet on a solid substrate generates distinctive desiccation patterns. These patterns have been identified as a potential tool for interpreting the pathological information of donors, since their morphological features encode pathological indicators linked to blood-related disorders. We [...] Read more.
The evaporation of a blood sessile droplet on a solid substrate generates distinctive desiccation patterns. These patterns have been identified as a potential tool for interpreting the pathological information of donors, since their morphological features encode pathological indicators linked to blood-related disorders. We collected two representative sets of blood samples from anonymous patients: healthy donors (normal haematocrit) and anaemia patients (low haematocrit). Our real-time observations of the morphological evolution during desiccation reveal distinct differences in pattern development. The macroscopic analysis indicates that blood sessile droplets from anaemia patients with abnormally low haematocrit levels experience divergent morphological trajectories, forming cracking patterns distinguishable from those of healthy donors. Our microscopic comparisons show that the blood desiccation patterns of healthy donors exhibit a longer coronal region and greater deposit coverage in the central region than those of anaemia patients. Our further analysis correlates these morphological variations to the effects of the haematocrit level of blood samples on material redistribution. This work proposes a facile strategy for health diagnostics through blood desiccation pattern analysis, highlighting its potential as a foundation for diagnostic platforms. Full article
(This article belongs to the Special Issue Bubble and Drop 2025 (B&D 2025))
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17 pages, 4755 KB  
Article
Influence and Correction of Refraction Phenomenon in Liquid Contact Angle Measurement in Capillary Tube
by Weixiu Shi, Mengmeng Ran and Lisheng Pan
Colloids Interfaces 2025, 9(3), 25; https://doi.org/10.3390/colloids9030025 - 23 Apr 2025
Viewed by 1974
Abstract
By using clear vapor–liquid interface line images of the liquid inside the capillary, the measurement coordinate points of the vapor–liquid interface line were measured. A new method for measuring liquid contact angle has been proposed, which was used to calculate the actual coordinate [...] Read more.
By using clear vapor–liquid interface line images of the liquid inside the capillary, the measurement coordinate points of the vapor–liquid interface line were measured. A new method for measuring liquid contact angle has been proposed, which was used to calculate the actual coordinate points and fit the actual vapor–liquid interface line of the liquid. Finally, an angle measurement tool is used to measure the angle of the actual vapor–liquid interface line and obtain the actual contact angle of the liquid. Effectively reducing the influence of refraction on the contact angle by correcting the errors caused by the refractive index of different materials, it can be used for the precise measurement of the static contact angle of liquids. By measuring the static contact angle of the upper and lower liquid surfaces of the liquid column, it was found that the presence of refraction caused a difference of [1.84°, 5.61°] between the actual and measured values of the static contact angle. Full article
(This article belongs to the Special Issue Bubble and Drop 2025 (B&D 2025))
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