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Applied Sciences
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Advances in the Improvement of Colloidal Systems’ Stability
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Advances in the Improvement of Colloidal Systems’ Stability

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 1500

Special Issue Editors

Dr. Grza̧dka Elzbieta

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Guest Editor
Faculty of Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
Interests: polymer adsorption; polymer–surfactant interactions; colloids; stability of dispersed systems
Dr. Jakub Matusiak

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Guest Editor
Department of Construction Materials Engineering and Geoengineering, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
Interests: adsorption; polysaccharides; wastewater treatment; material synthesis; surface modification; hydrogels; hybrid materials; 3D printing

Special Issue Information

Dear Colleagues,

Colloidal systems such as emulsions, suspensions, gels, foams and aerosols find numerous practical applications in different branches of industry. Their limitation is that they usually do not possess the long-term stability needed in product formulations. Therefore, the most important thing is to keep them stable. Some chemical additives (e.g.: high molar mass substances, surfactants) can help to solve this problem. However, these additives can also cause instability such as flocculation, which is very useful in wastewater treatment, but usually unwanted. The goal of modern methods of ensuring colloidal stability is to obtain stable, well-characterised materials with desirable colloidal properties.

This Special Issue will explore new perspectives on improving colloidal systems’ stability. The topics that will be discussed in this Special Issue will focus not only on modern methods and technologies, but also on the verification of the properties of the obtained systems.

We look forward to receiving your contributions.

Dr. Grza̧dka Elzbieta
Dr. Jakub Matusiak
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. Applied Sciences 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 2400 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

  • stabilitzation
  • flocculation
  • suspensions
  • emulsions
  • gels
  • foams
  • aerosols
  • nanoparticles
  • zeta potential
  • polymers

Published Papers (3 papers)

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Research

16 pages, 5202 KiB  
Article
New Fat Bases in Model Emulsion Systems in Physicochemical and Consumer Evaluation
by Małgorzata Kowalska, Magdalena Woźniak, Paweł Turek and Anna Żbikowska
Appl. Sci. 2024, 14(9), 3553; https://doi.org/10.3390/app14093553 - 23 Apr 2024
Viewed by 221
Abstract
The purpose of this study was to indicate the validity of using enzymatically interesterified fats as a fat emulsion base. A study was conducted to determine the stability of emulsion systems based on enzymatically interesterified fats and fats containing mixed fats. The fats [...] Read more.
The purpose of this study was to indicate the validity of using enzymatically interesterified fats as a fat emulsion base. A study was conducted to determine the stability of emulsion systems based on enzymatically interesterified fats and fats containing mixed fats. The fats used in the modifications were mutton tallow and hemp oil. It was found that emulsions based on esterified fats, regardless of the type of modified fat, showed a higher shelf life and had high homogeneity. On the other hand, emulsions based on mixed fats already showed destabilization characteristics in the first days. Their structure was heterogeneous. Microscopic evaluation clearly showed large droplets of the dispersed phase, indicating a tendency to delaminate. Consumer evaluation showed that the sensory quality of the presented emulsion systems based on enzymatically interesterified fats was fully accepted by the participating consumers. Based on the results of the study, it was concluded that all of the consumer-evaluated emulsions received good or very good acceptance in terms of the sensory characteristics evaluated. Full article
(This article belongs to the Special Issue Advances in the Improvement of Colloidal Systems’ Stability)
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16 pages, 4615 KiB  
Article
The Effect of Lysozyme on the Aggregation and Charging of Oxidized Carbon Nanohorn (CNHox) in Aqueous Solution
by Zhengjian Tian, Maolin Li, Takuya Sugimoto and Motoyoshi Kobayashi
Appl. Sci. 2024, 14(6), 2645; https://doi.org/10.3390/app14062645 - 21 Mar 2024
Viewed by 402
Abstract
To clarify the effect of proteins on the charging and aggregation–dispersion characteristics of oxidized carbon nanohorn (CNHox), we measured the electrophoretic mobility and stability ratios as a function of concentrations of a model protein, lysozyme (LSZ), and KCl. The zeta potential from the [...] Read more.
To clarify the effect of proteins on the charging and aggregation–dispersion characteristics of oxidized carbon nanohorn (CNHox), we measured the electrophoretic mobility and stability ratios as a function of concentrations of a model protein, lysozyme (LSZ), and KCl. The zeta potential from the electrophoretic mobility of CNHox was neutralized and reversed by the addition of oppositely charged LSZ. Electrical and hydrophobic interactions between CNHox and LSZ can be attributed to the adsorption and charge reversal of CNHox. The stability ratio of CNHox in the presence or absence of LSZ showed Derjaguin–Landau and Verwey–Overbeek (DLVO) theory-like behavior. That is, the slow aggregation regime, fast aggregation regime, and critical coagulation concentration (CCC) were identified. At the isoelectric point, only the fast aggregation regime was shown. The existence of patch-charge attraction due to the charge heterogeneity on the surface was inferred to have happened due to the enhanced aggregation of CNHox at high LSZ dosage and low electrolyte concentration. The relationship between critical coagulation ionic strength and surface charge density at low LSZ dosage showed that the aggregation of CNHox is in line with the DLVO theory. An obvious decrement in the Hamaker constant at high LSZ dosage can probably be found due to an increased interaction of LSZ-covered parts. Full article
(This article belongs to the Special Issue Advances in the Improvement of Colloidal Systems’ Stability)
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14 pages, 1779 KiB  
Article
Adsorption of Mixed Dispersions of Silica Nanoparticles and an Amphiphilic Triblock Copolymer at the Water–Vapor Interface
by Carlo Carbone, Alejandra Rubio-Bueno, Francisco Ortega, Ramón G. Rubio and Eduardo Guzmán
Appl. Sci. 2023, 13(18), 10093; https://doi.org/10.3390/app131810093 - 07 Sep 2023
Cited by 1 | Viewed by 594
Abstract
This study investigates the surface modification of hydrophilic silica nanoparticles by non-chemical adsorption of an amphiphilic triblock copolymer, Pluronic F-127, and elucidates its influence on the interfacial dispersion properties. The interaction between Pluronic F-127 and silica nanoparticles drives the formation of copolymer-decorated particles [...] Read more.
This study investigates the surface modification of hydrophilic silica nanoparticles by non-chemical adsorption of an amphiphilic triblock copolymer, Pluronic F-127, and elucidates its influence on the interfacial dispersion properties. The interaction between Pluronic F-127 and silica nanoparticles drives the formation of copolymer-decorated particles with increased hydrodynamic diameter and reduced effective charge as the copolymer concentration increases, while the opposite effect occurs as the particle concentration increases at a fixed polymer concentration. This indicates that increasing the copolymer concentration leads to an increase in the coating density, whereas increasing the particle concentration leads to a decrease. This is of paramount importance for modulating the reorganization of the Pluronic F-127 shell upon adsorption at fluid–fluid interfaces and, thus, the adsorption of the decorated nanoparticles at the interface and the rheological properties of the obtained layers. In fact, the relationship between copolymer concentration and interfacial tension, as well as the mechanical response of the interface, mirrors the patterns observed in Pluronic F-127 solutions, and only a shift mediated by the Pluronic F-127 concentration is found. This suggests that the presence of particles limits the space available for Pluronic F-127 molecules to reorganize at the interface but does not significantly affect the interfacial behavior of the particle-laden interface. Full article
(This article belongs to the Special Issue Advances in the Improvement of Colloidal Systems’ Stability)
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