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  1. Article ; Online: Effect of surfactants on the interfacial viscoelasticity and stability of silk fibroin at different oil-water interfaces.

    Qiao, Xiuying / Miller, Reinhard / Schneck, Emanuel / Sun, Kang

    Journal of the science of food and agriculture

    2024  Volume 104, Issue 5, Page(s) 2928–2936

    Abstract: Background: The biocompatible amphiphilic silk fibroin, extracted from domesticated silkworms, can adsorb at the oil-water interface and form elastic interfacial layers. In this study, three surfactants (cationic cetyltrimethylammonium bromide, the ... ...

    Abstract Background: The biocompatible amphiphilic silk fibroin, extracted from domesticated silkworms, can adsorb at the oil-water interface and form elastic interfacial layers. In this study, three surfactants (cationic cetyltrimethylammonium bromide, the nonionic polyoxyethylene sorbitan monolaurate, and the anionic sodium dodecyl sulfate) were selected to investigate, through interfacial shear rheology, the influences of surfactants on the interfacial viscoelasticity and stability of silk fibroin at the interfaces between water and two different oils.
    Results: The presence of surfactant prolongs the equilibration time and enhances the interfacial elastic modulus and toughness of the interfacial silk fibroin layers, especially at the nonpolar dodecane-water interface. However, when the surfactant exceeds a critical concentration, the shear modulus and stability of interfacial silk fibroin layers begin to decrease due to the competitive adsorption of surfactant molecules and the weakening of the protein network. Owing to electrostatic interactions, the ionic surfactants cetyltrimethylammonium bromide and sodium dodecyl sulfate can form more hydrophobic complexes with silk fibroin, which results in higher shear moduli than for silk fibroin and silk fibroin-polyoxyethylene sorbitan monolaurate mixture.
    Conclusion: Both the surfactant type and oil polarity play important roles in the adsorption, shear viscoelasticity, and stability of silk fibroin at the oil-water interface. Enhanced interactions between a silk fibroin-surfactant mixture and the oil phase delay the equilibration of the adsorption layers but strengthen the stability of interfacial layers. © 2023 Society of Chemical Industry.
    MeSH term(s) Surface-Active Agents/chemistry ; Fibroins/chemistry ; Sodium Dodecyl Sulfate ; Cetrimonium ; Polysorbates ; Water/chemistry ; Oils/chemistry
    Chemical Substances Surface-Active Agents ; Fibroins (9007-76-5) ; Sodium Dodecyl Sulfate (368GB5141J) ; Cetrimonium (Z7FF1XKL7A) ; Polysorbates ; Water (059QF0KO0R) ; Oils
    Language English
    Publishing date 2024-01-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 184116-6
    ISSN 1097-0010 ; 0022-5142
    ISSN (online) 1097-0010
    ISSN 0022-5142
    DOI 10.1002/jsfa.13185
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 808: Show issues Location:
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  2. Article ; Online: Effects of Aqueous Isotopic Substitution on the Adsorption Dynamics and Dilational Rheology of β-Lactoglobulin Layers at the Water/Air Interface.

    Gochev, Georgi G / Schneck, Emanuel / Miller, Reinhard

    The journal of physical chemistry. B

    2024  Volume 128, Issue 11, Page(s) 2821–2830

    Abstract: The effect of the degree of isotopic substitution of the aqueous medium on the adsorption kinetics and the surface dilational rheological behavior at the water/air interface of the globular protein β-lactoglobulin was investigated. Aqueous solutions with ...

    Abstract The effect of the degree of isotopic substitution of the aqueous medium on the adsorption kinetics and the surface dilational rheological behavior at the water/air interface of the globular protein β-lactoglobulin was investigated. Aqueous solutions with fixed concentrations of 1 μM protein and 10 mM hydrogenous buffer with controlled pH 7 were prepared in H
    Language English
    Publishing date 2024-03-12
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5207
    ISSN (online) 1520-5207
    DOI 10.1021/acs.jpcb.3c08417
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Interface Adsorption versus Bulk Micellization of Surfactants: Insights from Molecular Simulations.

    Kanduč, Matej / Stubenrauch, Cosima / Miller, Reinhard / Schneck, Emanuel

    Journal of chemical theory and computation

    2023  Volume 20, Issue 4, Page(s) 1568–1578

    Abstract: Surfactants play essential roles in many commonplace applications and industrial processes. Although significant progress has been made over the past decades with regard to model-based predictions of the behavior of surfactants, important challenges have ...

    Abstract Surfactants play essential roles in many commonplace applications and industrial processes. Although significant progress has been made over the past decades with regard to model-based predictions of the behavior of surfactants, important challenges have remained. Notably, the characteristic time scales of surfactant exchange among micelles, interfaces, and the bulk solution typically exceed the time scales currently accessible with atomistic molecular dynamics (MD) simulations. Here, we circumvent this problem by introducing a framework that combines the general thermodynamic principles of self-assembly and interfacial adsorption with atomistic MD simulations. This approach provides a full thermodynamic description based on equal chemical potentials and connects the surfactant bulk concentration, the experimental control parameter, with the surfactant surface density, the suitable control parameter in MD simulations. Self-consistency is demonstrated for the nonionic surfactant C
    Language English
    Publishing date 2023-05-22
    Publishing country United States
    Document type Journal Article
    ISSN 1549-9626
    ISSN (online) 1549-9626
    DOI 10.1021/acs.jctc.3c00223
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Editorial Overview: Hot Topic: COVID-19: Colloid and Interface Aspects of COVID-19.

    Liggieri, Libero / Miller, Reinhard

    Current opinion in colloid & interface science

    2021  Volume 56, Page(s) 101525

    Language English
    Publishing date 2021-10-16
    Publishing country England
    Document type Editorial
    ZDB-ID 2019683-0
    ISSN 1359-0294
    ISSN 1359-0294
    DOI 10.1016/j.cocis.2021.101525
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Advances in CO

    Dowlati, Saeid / Mokhtari, Rasoul / Hohl, Lena / Miller, Reinhard / Kraume, Matthias

    Advances in colloid and interface science

    2023  Volume 315, Page(s) 102907

    Abstract: ... ...

    Abstract CO
    Language English
    Publishing date 2023-04-15
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 210507-x
    ISSN 1873-3727 ; 0001-8686
    ISSN (online) 1873-3727
    ISSN 0001-8686
    DOI 10.1016/j.cis.2023.102907
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2716: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
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  6. Article ; Online: Pickering foams and parameters influencing their characteristics.

    Amani, Pouria / Miller, Reinhard / Javadi, Aliyar / Firouzi, Mahshid

    Advances in colloid and interface science

    2022  Volume 301, Page(s) 102606

    Abstract: Pickering foams are available in many applications and have been continually gaining interest in the last two decades. Pickering foams are multifaceted, and their characteristics are highly dependent on many factors, such as particle size, charge, ... ...

    Abstract Pickering foams are available in many applications and have been continually gaining interest in the last two decades. Pickering foams are multifaceted, and their characteristics are highly dependent on many factors, such as particle size, charge, hydrophobicity and concentration as well as the charge and concentration of surfactants and salts available in the system. A literature review of these individual studies at first might seem confusing and somewhat contradictory, particularly in multi-component systems with particles and surfactants with different charges in the presence of salts. This paper provides a comprehensive overview of particle-stabilized foams, also known as Pickering foams and froths. Underlying mechanisms of foam stabilization by particles with different morphology, surface chemistry, size and type are reviewed and clarified. This paper also outlines the role of salts and different factors such as pH, temperature and gas type on Pickering foams. Further, we highlight recent developments in Pickering foams in different applications such as food, mining, oil and gas, and wastewater treatment industries, where Pickering foams are abundant. We conclude this overview by presenting important research avenues based on the gaps identified here. The focus of this review is limited to Pickering foams of surfactants with added salts and does not include studies on polymers, proteins, or other macromolecules.
    MeSH term(s) Aerosols ; Emulsions/chemistry ; Particle Size ; Polymers ; Surface-Active Agents/chemistry
    Chemical Substances Aerosols ; Emulsions ; Polymers ; Surface-Active Agents
    Language English
    Publishing date 2022-02-01
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 210507-x
    ISSN 1873-3727 ; 0001-8686
    ISSN (online) 1873-3727
    ISSN 0001-8686
    DOI 10.1016/j.cis.2022.102606
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2716: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  7. Book ; Conference proceedings: Selected papers from the 15th Food Colloids Conference, date: 14 - 16 April, 2014 Karlsruhe, Germany

    Miller, Reinhard

    (Colloids and surfaces : A, Physicochemical and engineering aspects : Special issue ; 475.2015)

    2015  

    Title variant Fifteenth
    Event/congress Food Colloids Conference (15, 2014.04.14-16, Karlsruhe)
    Author's details ed. by Reinhard Miller
    Series title Colloids and surfaces : A, Physicochemical and engineering aspects : Special issue ; 475.2015
    Language English
    Size 102 S.
    Publisher Elsevier
    Publishing place Amsterdam u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  8. Book ; Conference proceedings: Selected papers from the 26th European Colloid and Interface Society conference (26th ECIS 2012)

    Miller, Reinhard

    date: 02 - 07 September, 2012 Malmö, Sweden

    (Colloids and surfaces : A, Physicochemical and engineering aspects : Special issue ; 442.2014)

    2014  

    Title variant Twenty-Sixth
    Institution European Colloid and Interface Society
    Event/congress ECIS (26, 2012.09.02-07, Malmö) ; European Colloid and Interface Society conference (26, 2012.09.02-07, Malmö)
    Author's details ed. by Reinhard Miller
    Series title Colloids and surfaces : A, Physicochemical and engineering aspects : Special issue ; 442.2014
    Language English
    Size 198 S.
    Publisher Elsevier
    Publishing place Amsterdam u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Book ; Conference proceedings: 27th European Colloid and Interface Society conference (27th ECIS 2013)

    Miller, Reinhard

    [... was held in Sofia, Bulgaria, on September 01 - 06, 2013]

    (Colloids and surfaces : A, Physicochemical and engineering aspects : Special issue ; 460.2014)

    2014  

    Title variant Twenty-Seventh
    Institution European Colloid and Interface Society
    Event/congress ECIS (27, 2012.09.01-06, Sofia) ; European Colloid and Interface Society conference (27, 2012.09.01-06, Sofia)
    Author's details ed. by Reinhard Miller
    Series title Colloids and surfaces : A, Physicochemical and engineering aspects : Special issue ; 460.2014
    Language English
    Size 526 S.
    Publisher Elsevier
    Publishing place Amsterdam u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  10. Article ; Online: Evaluation of Interfacial Structure of Self-Assembled Nanoparticle Layers: Use of Standard Deviation between Calculated and Experimental Drop Profiles as a Novel Method.

    Mahmoudvand, Mohsen / Vatanparast, Hamid / Javadi, Aliyar / Kantzas, Apostolos / Burns, Stuart / Dolgos, Michelle / Miller, Reinhard / Bahramian, Alireza

    Langmuir : the ACS journal of surfaces and colloids

    2024  Volume 40, Issue 4, Page(s) 2130–2145

    Abstract: The self-assembly of nanoparticles (NPs) at interfaces is currently a topic of increasing interest due to numerous applications in food technology, pharmaceuticals, cosmetology, and oil recovery. It is possible to create tunable interfacial structures ... ...

    Abstract The self-assembly of nanoparticles (NPs) at interfaces is currently a topic of increasing interest due to numerous applications in food technology, pharmaceuticals, cosmetology, and oil recovery. It is possible to create tunable interfacial structures with desired characteristics using tailored nanoparticles that can be precisely controlled with respect to shape, size, and surface chemistry. To address these functionalities, it is essential to develop techniques to study the properties of the underlying structure. In this work, we propose an experimental approach utilizing the standard deviation of drop profiles calculated by the Laplace equation from experimental drop profiles (STD), as an alternative to the Langmuir trough or precise microscopic methods, to detect the initiation of closely packed conditions and the collapse of the adsorbed layers of CTAB-nanosilica complexes. The experiments consist of dynamic surface/interfacial tension measurements using drop profile analysis tensiometry (PAT) and large-amplitude drop surface area compression/expansion cycles. The results demonstrate significant changes in STD values at the onset of the closely packed state of nanoparticle-surfactant complexes and the monolayer collapse. The STD trend was explained in detail and shown to be a powerful tool for analyzing the adsorption and interfacial structuring of nanoparticles. Different collapse mechanisms were reported for NP monolayers at the liquid/liquid and air/liquid interfaces. We show that the interfacial tension (IFT) is solely dependent on the extent of interfacial coverage by nanoparticles, while the surfactants regulate only the hydrophobicity of the self-assembled complexes. Also, the irreversible adsorption of nanoparticles and the increasing number of adsorbed complexes after the collapse were observed by performing consecutive drop surface compression/expansion cycles. In addition to a qualitative characterization of adsorption layers, the potential of a quantitative calculation of the parameter STD such as the number of adsorbed nanoparticles at the interface and the distance between them at different states of the interfacial layer was discussed.
    Language English
    Publishing date 2024-01-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.3c03081
    Database MEDical Literature Analysis and Retrieval System OnLINE

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