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Foam and Emulsion Systems: Stability, Rheology, and Applications

A special issue of Molecules (ISSN 1420-3049).

Deadline for manuscript submissions: 30 April 2026 | Viewed by 288

Special Issue Editor


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Guest Editor
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 8 Niezapominajek St., 30-239 Krakow, Poland
Interests: adsorption; foams; emulsions
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Special Issue Information

Dear Colleagues,

Foams and emulsions are ubiquitous in both natural and engineered systems, playing a central role in fields ranging from food and pharmaceuticals to materials science and environmental technologies. Their functional properties are intimately linked to their stability, interfacial behavior, and rheological characteristics, which in turn depend on the composition, processing conditions, and the presence of stabilizers such as surfactants, polymers, or particles. With growing interest in sustainable and bio-based formulations, the development and characterization of novel foam and emulsion systems have become increasingly relevant. Additionally, the use of solid particles to form Pickering emulsions and Pickering foams has emerged as a promising strategy to enhance stability and tailor functional properties without the need for conventional surfactants.

This Special Issue aims to gather high-quality contributions focused on fundamental and applied aspects of foam and emulsion systems. Topics of interest include, but are not limited to, the following: interfacial phenomena and mechanisms of stabilization, rheology of dispersed systems, structure–function relationships, and innovative applications in areas such as drug delivery, food technology, cleaning processes, and cosmetics. We particularly welcome submissions on particle-stabilized systems, green chemistry approaches and advanced characterization techniques. Both experimental and theoretical/computational studies are encouraged.

We invite researchers from academia and industry to contribute original research articles, reviews, or short communications that advance our understanding of these complex and versatile soft matter systems.

Dr. Marcel Krzan
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 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. Molecules 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 2700 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

  • foams
  • emulsions
  • interfacial stability
  • rheology
  • soft matter
  • applications

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Published Papers (1 paper)

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Review

34 pages, 579 KB  
Review
Albizia amara: A Potential Plant-Derived Surfactant for Cosmetic and Food Applications
by Yalini Sadasivam, Valerie J. Pinfield and Anna Trybala
Molecules 2026, 31(1), 81; https://doi.org/10.3390/molecules31010081 - 24 Dec 2025
Abstract
Surfactants are essential in cosmetic and food formulations but are still dominated by petrochemical-derived anionic systems associated with irritation, aquatic toxicity and sustainability concerns. Plant-derived saponins offer renewable, biodegradable alternatives, yet only a small subset of saponin-producing species has been developed into commercial [...] Read more.
Surfactants are essential in cosmetic and food formulations but are still dominated by petrochemical-derived anionic systems associated with irritation, aquatic toxicity and sustainability concerns. Plant-derived saponins offer renewable, biodegradable alternatives, yet only a small subset of saponin-producing species has been developed into commercial ingredients. The genus Albizia is chemically diverse and widely used in traditional medicine, with several species empirically employed as cleansers. This review examines Albizia amara and related Albizia species as prospective sources of plant-derived surfactants for cosmetic and food applications. We summarise ethnobotanical and phytochemical data with emphasis on saponins, flavonoids and macrocyclic alkaloids, and collate the limited quantitative evidence for surface activity, focusing on foaming behaviour, surface tension reduction and shampoo-type formulations, where A. procera provides the main interfacial benchmark within the genus. Potential roles of A. amara-derived fractions in hair-care products and prospective food systems are discussed alongside current knowledge on toxicity, safety and regulatory constraints. Overall, A. amara emerges as a promising but under-characterised saponin source. Priority areas for future work include robust tensiometric characterisation, surfactant-focused extraction and fractionation, systematic formulation studies, and dedicated safety and sustainability assessments to enable evidence-based evaluation against established plant and synthetic surfactants. Full article
(This article belongs to the Special Issue Foam and Emulsion Systems: Stability, Rheology, and Applications)
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