Article
Chemistry, Applied
Hui Niu, Xianwei Chen, Tian Luo, Haiming Chen, Xiong Fu
Summary: In this study, the structural characterization and chemical compositions of three different pectins were studied. The results showed that sugar beet pectin (SBP) had higher protein contents, feruloylated groups, acetyl groups, and more hairy regions compared to apple pectin (AP) and citrus peel pectin (CPP). Molecular dynamics simulations revealed that the SBP formed a thick viscoelastic film on the oil-water interface. Further studies showed that under high-concentration and acidic conditions, pectin molecules were adsorbed in multiple layers at the oil-water interface, forming a thicker viscoelastic film, which was crucial for the long-term stability of pectin-stabilized emulsions.
FOOD HYDROCOLLOIDS
(2022)
Article
Polymer Science
Raviteja Kurapati, Upendra Natarajan
Summary: Atomistic MD simulations were used to investigate the structure and hydration properties of isotactic Poly (methacrylic acid) (i-PMA) at the CCl4-H2O interface at different concentrations. The study revealed the occurrence of three concentration regimes (dilute, semi-dilute, and concentrated) at the molecular level for the first time in polymer systems at an oil-water interface. The conformation of i-PMA chains changed from planar to random coil structure with increasing interface concentration, marked by variations in the components of Rg and a decrease in the preferential orientation of the side groups. The study provided new molecular insights into the conformational changes and interactions among different chemical groups with varying interface concentration of the polymer.
Review
Chemistry, Applied
Mi Zhang, Liuping Fan, Yuanfa Liu, Shengquan Huang, Jinwei Li
Summary: This review discusses the protein adsorption behavior at the oil-water interface, emphasizing the effects of protein conformation, oil polarity, and aqueous environments on adsorption. Pre-changing methods and co-adsorption are highlighted as strategies to improve protein adsorption and stability of emulsion systems.
Article
Chemistry, Applied
Yilun Luo, Wei Zheng, Qian Shen, Li Zhang, Cuie Tang, Rong Song, Shilin Liu, Bin Li, Yijie Chen
Summary: The study found that at the oil-water interface, PA-2 can adsorb in the form of aggregates and exhibit a non-monotonic dependence on the dynamic viscoelastic modulus. The addition of 2-ME impacts the experimental results, causing protein aggregates to disaggregate and rearrange at a higher rate on the interface.
FOOD HYDROCOLLOIDS
(2021)
Article
Materials Science, Multidisciplinary
Zhuo Zhu, Ai-juan Wang, Hua Xue, Luyang Miao, Rong Liu, Dongjie Liu
Summary: This study investigated the adsorption behavior of HAp nanoparticles at the oil-water interface by varying the PGPR concentration. Results showed that with increasing PGPR concentration, HAp nanoparticles gradually escaped from the oil-water interface, with PGPR becoming the main emulsion stabilizer.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Alexandre Poirier, Antonio Stocco, Romain Kapel, Martin In, Laurence Ramos, Amelie Banc
Summary: The study investigated the adsorption process of sunflower protein extract at two air-water and oil-water interfaces, revealing a three-step mechanism. Initially, a diffusion-limited adsorption of proteins at interfaces occurs, followed by the formation of a three-dimensional saturated monolayer of proteins, and finally a thick layer expanding in the aqueous phase. The study also found that the adsorption mechanisms of proteins exhibit significant divergences at longer adsorption times.
Article
Chemistry, Physical
Xiaoyu Sun, Hongbo Zeng, Tian Tang
Summary: This study used molecular simulations to investigate the adsorption and interactions between polycyclic aromatic compounds (PACs) and non-ionic surfactants at water/oil interfaces. The findings revealed the complex interplay between PAC-surfactant interactions, PAC solubility, and the structure-dependent PAC aggregation. Different non-ionic surfactants were found to have different effects on the adsorption of PACs at the interfaces, with some inducing desorption and others enhancing adsorption. The study also identified how the roles of non-ionic surfactants can be affected by their concentration, as well as the solubility and interfacial behaviors of the PACs.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Jotam Bergfreund, Michael Diener, Thomas Geue, Natalie Nussbaum, Nico Kummer, Pascal Bertsch, Gustav Nystrom, Peter Fischer
Summary: The polarity of the oil phase has a significant impact on the formation of globular protein networks at fluid interfaces, including the degree of protein unfolding, protein location, and network strength.
Article
Electrochemistry
Atsuki Yamauchi, Kazuo Eda, Toshiyuki Osakai
Summary: In this study, a non-Bornian solvation model was extended to predict the adsorption equilibrium of ionic surfactants at the polarized oil/water interface. The calculation results showed that a cationic surfactant was adsorbed at the nitrobenzene/water interface when the interfacial potential was negative, consistent with previous experimental observations.
Article
Energy & Fuels
Lamia Goual, Bingjun Zhang, Youssra Rahham
Summary: This study utilized Transmission Electron Microscopy to provide nanoscale characterization of thin films responsible for oil/water emulsion stability, revealing vertical stacks of wormlike asphaltene clusters that form a protective layer and reduce interfacial tension at the interface.
Article
Energy & Fuels
Sharath Chandra Mahavadi, Mohammed Al Hamad, Shouxiang Mark Ma, Wael Abdallah
Summary: Interfacial tension (IFT) between crude oil and water is a critical property that affects multiphase flow in porous media. Measuring IFT in the laboratory is challenging, and tools for downhole measurement are currently unavailable. Existing reservoir simulators rely on empirical models that do not accurately account for crude oil chemistry. This study developed a potential model for downhole IFT measurement using crude oil samples from different fields. The model can improve saturation height function modeling, aid in field development planning and production strategies, and serve as a monitoring tool to prevent technical issues.
Article
Food Science & Technology
Alia A. F. Hetta, Olivia A. Attallah, Wael Mamdouh
Summary: Fish oil extracted from Euthynnus affinis captured from the Red Sea, Egypt was purified using 5% chitosan/oil ratio in a non-centrifuged sequential purification technique. This method showed efficient results in removing impurities and can be a potential commercial filter for high-quality fish oil production. The study highlights the significance of Kawakawa fish as a protein source in the Egyptian diet and emphasizes the importance of chemically and environmentally safe purification procedures for industrial applications.
JOURNAL OF FOOD PROCESSING AND PRESERVATION
(2021)
Article
Chemistry, Multidisciplinary
Sebastian Stock, Luca Mirau, Matthias Rutsch, Sonja Wismath, Mario Kupnik, Regine von Klitzing, Amin Rahimzadeh
Summary: This study investigates the effects of ultrasound on dispersed soft particles and their adsorption kinetics at interfaces. The results show that ultrasound not only accelerates particle movement but also manipulates particle interaction with the surrounding liquid. High-frequency and low-amplitude ultrasound are found to speed up the adsorption kinetics of microgels at water-oil interfaces, leading to a reduction in interfacial tension.
Article
Environmental Sciences
Mark L. Brusseau, Sarah Van Glubt
Summary: This study investigated the influence of PFAS molecular structure on air-water interfacial adsorption in electrolyte solutions, finding significant impact of chain length trends on surface activities and interfacial adsorption coefficients. The QSPR analysis using a single molecular descriptor successfully characterized the impact of PFAS molecular structure on air-water interfacial adsorption.
Article
Chemistry, Physical
Brayan F. Garcia, Soheil Saraji
Summary: This study examines interfacial rheology and polar component dynamics in crude oil and brine systems with different salinities. It reveals that diffusion/adsorption processes are the dominant relaxation mechanisms and transient interfacial rheology plays a crucial role in defining final apparent interfacial properties.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Multidisciplinary
Valentin B. Fainerman, Volodymyr Kovalchuk, Eugene Aksenenko, Francesca Ravera, Libero Liggieri, Giuseppe Loglio, Alexander Makievski, Natalia O. Mishchuk, Emanuel Schneck, Reinhard Miller
Summary: Comparison between experimental data and a multistate model shows that the behavior of the adsorption layer of the nonionic surfactant C13DMPO can be better described by three adsorption states than by only two adsorption states.
Article
Biochemistry & Molecular Biology
Nikolay S. Chirkov, Shi-Yow Lin, Alexander Michailov, Reinhard Miller, Boris A. Noskov
Summary: The interactions between DNA and lysozyme in the surface layer were studied using various experimental methods. Unlike the case with a monolayer of cationic synthetic polyelectrolyte, no continuous network of DNA/lysozyme complexes was formed. The weaker interactions between lysozyme and DNA led to the formation of more disordered aggregates at high lysozyme concentrations in the surface layer.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Chemistry, Applied
Dan Lundberg, Maria Stjerndahl, Krister Holmberg
Summary: Surfactants with an ester bond are easy to synthesize, can be made from natural raw materials, and have good biodegradation properties. However, labile ester bonds in some surfactants can cause stability issues at high pH. This article discusses the alkaline hydrolysis of different types of ester-based surfactants and surfactant mixtures, finding that cationic surfactants hydrolyze rapidly while anionic and nonionic ester-based surfactants are more resistant to hydrolysis.
JOURNAL OF SURFACTANTS AND DETERGENTS
(2023)
Article
Chemistry, Physical
Matej Kanduc, Cosima Stubenrauch, Reinhard Miller, Emanuel Schneck
Summary: Surfactants play important roles in everyday applications and industrial processes. However, the characteristic time scales of surfactant exchange pose challenges for atomistic molecular dynamics simulations. In this study, a framework combining thermodynamic principles and atomistic MD simulations was introduced, which provided a full thermodynamic description and connected the experimental control parameter with the suitable control parameter in MD simulations. The results showed a semiquantitative agreement between simulation and experimental data, but also highlighted opportunities for improving the current atomistic models in predicting surfactant affinities to aggregates.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Chemistry, Multidisciplinary
V. I. Kovalchuk, E. V. Aksenenko, E. Schneck, R. . Miller
Summary: In recent years, significant progress has been made in the understanding of surfactant adsorption at liquid interfaces. New efficient methodologies, particularly interfacial selective optical methods, have been developed to directly access the adsorbed amounts and interfacial layer compositions. Thermodynamic equations of state provide a quantitative framework for describing surfactant interfacial layers, especially at water/oil interfaces. Molecular modeling techniques have also contributed to the understanding of interfacial layer structures. Improving the interrelationships between these aspects is a challenge for current and future research, with particular focus on dilational interfacial rheology studies.
Article
Chemistry, Multidisciplinary
Olga Yu. Milyaeva, Alexander V. Akentiev, Nikolay S. Chirkov, Shi-Yow Lin, Wen-Chi Tseng, Petr S. Vlasov, Reinhard Miller, Boris A. Noskov
Summary: The influence of an amphiphilic polyelectrolyte on the surface properties of protein solutions depends on the protein structure and can help understand the contribution of hydrophobic interactions in protein-polyelectrolyte complex formation. The adsorption process can be monitored through dilational dynamic surface elasticity measurements, and the conclusions are supported by ellipsometric and tensiometric results.
Article
Chemistry, Physical
Hashem Ahmadi Tighchi, Mohammad Hasan Kayhani, Ali Faezian, Samira Yeganehzad, Reinhard Miller
Summary: This research discusses a theoretical model for the liquid drainage of foams made from licorice root extract solutions, and validates its effectiveness. By simplifying the governing equation, a relationship between drained liquid volume and effective parameters is obtained. The theoretical model is applied to experimental foam drainage data, and the results show good agreement. The combination of effective parameters allows for a quantification of the drainage rate, and measurable properties can estimate the drainage rate at the beginning of foam decay as a measure of stability.
COLLOIDS AND INTERFACES
(2023)
Review
Chemistry, Physical
Olga Milyaeva, Alexey Bykov, Reinhard Miller
Summary: Surface-active compounds are essential in many modern technologies, and they significantly alter the properties of inherent interfaces. The interfacial dilational visco-elasticity, which directly relates to the equation of state and interfacial molecular dynamics, is a crucial physical quantity. The scientific field of interfacial visco-elasticity, inspired by notable pioneers, has notably advanced with contributions to the theoretical foundation and experimental analysis of polymer and mixed surfactant-polymer interfacial layers, particularly by Boris Noskov.
COLLOIDS AND INTERFACES
(2023)
Article
Chemistry, Physical
Fariza Amankeldi, Miras Issakhov, Peyman Pourafshary, Zhanar Ospanova, Maratbek Gabdullin, Reinhard Miller
Summary: This paper explores the potential of aggregates of surfactant and SiO2 nanoparticles as foam stabilizers for practical applications. It examines the effects of different chain lengths and concentrations of the cationic surfactant C(n)TAB on the performance of C(n)TAB-SiO2 nanofluids to understand their ability to stabilize foam. The results demonstrate improved foam stability in the presence of SiO2 nanoparticles, offering insights into foam stabilization and its potential in various industrial applications such as enhanced oil recovery and foam-based separation processes.
COLLOIDS AND INTERFACES
(2023)
Review
Chemistry, Physical
Ming Lu, Bjorn Lindman, Krister Holmberg
Summary: Ternary oil-water-surfactant systems can form O/W, W/O, or bicontinuous microemulsions. Addition of a polymer can significantly affect the phase behavior, particularly expanding the middle phase microemulsion in a Winsor III system. This is practically important for enhanced oil recovery, but the scientific understanding of the role of the polymer and its interactions with the other three components in the system (oil, water, and surfactant) is still limited.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Saeid Dowlati, Aliyar Javadi, Reinhard Miller, Kerstin Eckert, Matthias Kraume
Summary: Unfolding can deactivate enzymes and significantly affect the yield in biochemical engineering. Urea-induced unfolding of lipase destructs its structure and reduces the viscoelasticity of the adsorbed layer.
COLLOIDS AND INTERFACES
(2022)
Review
Chemistry, Physical
Eva Santini, Irene Nepita, Alexey G. Bykov, Francesca Ravera, Libero Liggieri, Saeid Dowlati, Aliyar Javadi, Reinhard Miller, Giuseppe Loglio
Summary: The input of chemical and physical sciences in life sciences is increasingly important, especially in the field of surface science which provides practical tools for medical research. Surface science methods have been successfully applied in diagnosing human biological liquids, characterizing pulmonary surfactants, addressing ophthalmology problems, and dealing with obesity issues. Furthermore, the application of fullerenes as a cancer detection system is also discussed.
COLLOIDS AND INTERFACES
(2022)
Article
Chemistry, Physical
Richard A. Campbell, Talmira Kairaliyeva, Svetlana Santer, Emanuel Schneck, Reinhard Miller
Summary: In this study, the interfacial composition during and after the interactions of a saturated atmosphere of oil vapor with soluble surfactant solutions at a planar water/air interface was directly resolved. The experiments revealed the balance between cooperativity and competition of the components at the interface.
COLLOIDS AND INTERFACES
(2022)
Review
Chemistry, Physical
Xiuying Qiao, Reinhard Miller, Emanuel Schneck, Kang Sun
Summary: Like other proteins, silk fibroin can stabilize foam by adsorbing at the air/water interface and forming water-insoluble viscoelastic films. The solution conditions play an important role in the molecular adsorption and foaming properties of silk fibroin.
COLLOIDS AND INTERFACES
(2022)
Article
Chemistry, Physical
Alexey Bykov, Olga Milyaeva, Alexander Akentiev, Maria Panaeva, Nikolaj Isakov, Reinhard Miller, Boris Noskov
Summary: The sign of particle charge has a smaller influence on the dynamic properties of mixed monolayers compared to the ability of nanoparticles to aggregate. Under physiological conditions, nanoparticles have an insignificant effect on the elasticity of DPPC monolayers but prevent the surface tension from decreasing to extremely low values, potentially impacting the functionality of pulmonary surfactants.
COLLOIDS AND INTERFACES
(2022)
