Article
Chemistry, Physical
Camille Faucon, Pascale Chalier, Christian Sanchez
Summary: This article investigates the adsorption of Acacia gum to oil-water interfaces using interfacial tension and rheological analysis. It is found that Acacia gum forms a viscoelastic interfacial structure through a 3-phase mechanism, and the interaction energy between water and oil plays a crucial role in determining the interfacial properties of Acacia gum. A volumetric adsorption mechanism is proposed, and the possible emergence of a gel-like transient dissipative structure is discussed.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Food Science & Technology
Katherine Petker, Michael A. Rogers, Iris J. Joye
Summary: The study investigated the behavior of untreated and chemically hardened gliadin nanoparticles at oil-water interfaces. It found that untreated GNPs formed cohesive and deformable viscoelastic films with stronger interactions, suggesting their ability to effectively interact with oil droplets. These results highlight the importance of particle deformability and protein mobility for forming strong interfacial films in emulsions.
FOOD STRUCTURE-NETHERLANDS
(2021)
Review
Physics, Multidisciplinary
Md Anisur Rahman, Peter J. Beltramo
Summary: This review highlights the fundamental science of rough colloidal particles at fluid interfaces and their potential as a design parameter for material design. The importance of roughness has been revealed, but the field is still in its early stages, with challenges and opportunities for future research.
FRONTIERS IN PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Siddharth Thakur, Sepideh Razavi
Summary: This study investigates the effect of particle size on the rheological properties of silica particle-laden interfaces. The results show that 1000 nm silica particle networks have higher surface pressure at the same coverage compared to 250 nm particles due to stronger capillary interactions. Interfacial rheological characterization reveals that networks with 1000 nm particles possess higher surface modulus and yield stress compared to networks with 250 nm particles at the same surface pressure. These findings highlight the importance of particle size in determining the rheological characteristics of particle-laden interfaces.
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
Chemistry, Applied
Xilong Zhou, Guido Sala, Leonard M. C. Sagis
Summary: The mechanical properties of oil-water and air-water interfaces stabilized with mixtures of micellar casein isolate and whey protein isolate were investigated. The results showed that casein prefers to adsorb and dominate the oil-water interface, while the whey protein forms a stronger and more flexible interface. In the case of air-water interfaces, casein displays higher surface activity and faster diffusion, leading to a decrease in surface tension. Casein also co-adsorbs with whey protein at the air-water interface, significantly affecting the dilatational response of the interface formed by pure whey proteins.
FOOD HYDROCOLLOIDS
(2022)
Review
Green & Sustainable Science & Technology
Yijun Liu, Zhengda Lin, Yang Luo, Rui Wu, Rui Fang, Ahmad Umar, Zhongming Zhang, Zhiying Zhao, Jie Yao, Shuaifei Zhao
Summary: Metal-organic frameworks (MOFs) show great potential for applications such as gas adsorption, catalysis, and separation due to their unique properties. MOFs with exceptional wettability have emerged as promising materials for advanced oil-water separation. This review discusses the synthesis and challenges of superhydrophobic MOFs and their complexes for oil-water separation, as well as providing insightful perspectives and recommendations for their design, characterization, and application.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Nanoscience & Nanotechnology
Mohamed Amen Hammami, Antonios Kouloumpis, Genggeng Qi, Ahmed Wasel Alsmaeil, Bashayer Aldakkan, Mazen Y. Kanj, Emmanuel P. Giannelis
Summary: A targeted and controlled delivery of molecular surfactants at oil-water interfaces is achieved by the directed assembly of nanoparticles. The assembly of positively charged polystyrene nanoparticles at the oil-water interface is facilitated by the introduction of carboxylic acid groups in the oil phase. The presence of the nanoparticles lowers the stiffness of the water-oil interface and reduces interfacial adhesion. The nanoparticles can release a previously loaded cargo of surfactant molecules, leading to the formation of a finer oil-water emulsion.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Computer Science, Information Systems
Jianhua Dai, Xiongtao Zou, Wei-Zhi Wu
Summary: In this study, a new framework of fuzzy fl-covering rough set models is proposed, and the existing methods are improved by constructing new fuzzy fl-neighborhood operators and defining the fuzzy fl-covering relation. Experimental results demonstrate the significant advantages of the proposed method.
INFORMATION SCIENCES
(2022)
Article
Chemistry, Physical
Xinya Chen, Guangyu Sun, Daiwei Liu, Huihui Zhang, Hao Zhang, Chuanxian Li, Zhiqi Zhao
Summary: Research has shown that emulsifiers can promote the crystallization of paraffin wax at the interface, forming an elastic interfacial film that prevents water droplet coalescence. Wax crystals play a dominant role in the network forming process by preventing droplet coalescence.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Sashikumar Ramamirtham, Martin A. K. Williams, Davoud Zare, Mike Weeks, Catherine P. Whitby
Summary: Complexation of high-methylesterified pectins with beta-lactoglobulin at pH 4 can strengthen protein films at dodecane/water interfaces, doubling the steady state shear elastic moduli. The charge density and pattern of the polysaccharide primarily determine the lag times of film formation. Adsorbed beta-lactoglobulin molecules cross-link in the aqueous phase, strengthening the resulting interfacial layer.
Article
Chemistry, Physical
Caroline Hadjiefstathiou, Audrey Maniere, Joan Attia, Florian Pion, Paul-Henri Ducrot, Ecaterina Gore, Michel Grisel
Summary: This study investigates the mechanisms governing the stabilization of emulsions by fractionated lignins at different pH levels. The results show that the presence of lignins as either particles or surfactants has different impacts on the emulsion stability. Furthermore, the coexistence of lignin particles and surfactants leads to optimal interfacial stabilization of the emulsion.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Energy & Fuels
Sebastien Simon, Kim Ehret, Pauline Darcel, Johan Sjoblom, Nicolas Passade-Boupat, Thierry Palermo
Summary: The reaction between ARN and Ca2+ leads to the formation of an interfacial gel in the initial steps of calcium naphthenate deposition, which can be inhibited by components such as asphaltenes and naphthenic acids in crude oils. The efficiency of inhibition of four crude oils was compared based on changes in interfacial tension and dilational modulus, with naphthenic acids found to be the most prevalent inhibitors in the tested crude oils. Bottle tests indicated the presence of a soft solid material formed by the reaction between ARN and Ca2+ even in the crude oil with the highest interfacial gel inhibition efficiency, highlighting the need for a better understanding of the ARN/Ca2+ system.
Article
Chemistry, Multidisciplinary
Anne C. Nickel, Timon Kratzenberg, Steffen Bochenek, Maximilian M. Schmidt, Andrey A. Rudov, Andreas Falkenstein, Igor I. Potemkin, Jerome J. Crassous, Walter Richtering
Summary: This study investigates the two-dimensional ordering of different core-shell microgels with varying softness and size at oil-water interfaces, revealing that softness affects the alignment of tip-to-tip or side-to-side ordering, i.e., the alignment mode, along with hardness and size. Thin and harder microgel shells lead to side-to-side ordering, while large, soft microgel shells result in tip-to-tip alignment.
Article
Chemistry, Multidisciplinary
Villa Krishna Harika, Tirupathi Rao Penki, Boddapati Loukya, Atanu Samanta, Gui-Liang Xu, Cheng-Jun Sun, Ilya Grinberg, Francis Leonard Deepak, Khalil Amine, Doron Aurbach, Aharon Gedanken
Summary: This study reports a simple sonochemical method to obtain solid mercury nanoparticles at ambient conditions for the first time, which exhibit unique properties compared to bulk liquid mercury and show potential applications in electroanalytical chemistry and electrocatalysis. Extensive characterization using various physicochemical techniques revealed the remarkable rhombohedral morphology and crystallinity of the solid Hg nanoparticles at room temperature.
Article
Engineering, Chemical
Peter E. Neerincx, Martin Hofmann, Oleksandr Gorodetskyi, Kirill Feldman, Jan Vermant, Han E. H. Meijer
Summary: This article presents a method to create hierarchical fractal structures through controlled processing operations using static mixing elements, focusing on multiplying structures rather than layers. With the derived design language, complex hierarchical fractal structures can be generated by changing the number and sequence of operators within extrusion dies or molds. The strategy aims to minimize mirroring steps and achieve genuine cocontinuity throughout the cross section, providing a one-step solution for producing material structures for diverse potential applications.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Mechanics
Meisam Pourali, Martin Kroger, Jan Vermant, Patrick D. Anderson, Nick O. Jaensson
Summary: This study investigates the flow of viscous interfaces carrying an insoluble surface active material, exploring the complex interplay between Marangoni stresses, compressibility, and surface shear and dilatational viscosities. By conducting numerical simulations on particle probes, the relationship between drag and interfacial properties necessary for microrheology is quantified. The research reveals the intimate coupling between bulk and interfacial flows, demonstrating the effects of different physical factors on the velocity field and drag coefficient.
Article
Chemistry, Physical
Mariana Rodriguez-Hakim, Linard Raez, Jan Vermant
Summary: Some contagious diseases, such as COVID-19, spread through aerosols and droplets. This study examines the formation of aerosols and droplets, particularly the influence of saliva composition, and suggests that variations in saliva elasticities could contribute to differences in disease transmission between individuals.
Article
Nanoscience & Nanotechnology
Alexandra Bayles, Tazio Pleij, Martin Hofmann, Fabian Hauf, Theo Tervoort, Jan Vermant
Summary: Polymer hydrogels, with their biocompatibility, stimuli responsiveness, and affordability, find broad application as advanced biomaterials and functional materials. A continuous processing scheme using laminar flow is reported to direct the organization of cross-linking density across a single sample, enabling the production of structured hydrogel filaments for soft actuator and sensor applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Alexandra Bayles, Jan Vermant
Summary: In multiphase materials, structured fluid-fluid interfaces can provide mechanical resistance against destabilization and preserve interface integrity. By designing the intrinsic qualities of surface-active species and the processing history, ideal rheology can be achieved. Navigating the interplay among property, structure, and processing history is essential for improving material and energy use and realizing unique multiphase materials.
Article
Chemistry, Physical
Laura Scheidegger, Laura Stricker, Peter J. Beltramo, Jan Vermant
Summary: The presence of oil molecules and line-active hybrid phospholipids can regulate the size of domains in lipid bilayers. This study investigates the effects of different types and molecular structures of oil molecules and hybrid lipids on the growth kinetics and thermodynamics of domains in planar lipid bilayers. The results show that the size of domains is significantly influenced by the degree of swelling of the bilayer and the changes in line tension induced by the different oils and hybrid lipids. Additionally, the phase transition temperature is affected by the presence of oil molecules but not significantly by the presence of hybrid lipids. Overall, this study provides insights into how to regulate domain size in binary membrane model systems.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Biology
Steffen Geisel, Eleonora Secchi, Jan Vermant
Summary: Biofilms are bacterial communities encased by a self-produced matrix, and the channel networks formed within the biofilm play a vital role in promoting the transport of nutrients and chemicals. This study focuses on the role of the biofilm matrix adhesion in channel formation, specifically in Pseudomonas aeruginosa biofilms grown under constant flow in microfluidic channels. The formation of wrinkles and folds is triggered by a mechanical buckling instability, resulting in hollow channels that facilitate bacterial movement.
Article
Chemistry, Multidisciplinary
Alesya Mikhailovskaya, Emmanouil Chatzigiannakis, Damian Renggli, Jan Vermant, Cecile Monteux
Summary: This study compares the macroscopic drainage and collapse behavior of aqueous foams stabilized by different stabilizers and investigates the dynamic behavior of individual thin films. The comparison provides significant insight into the effect of surface stresses and intermolecular forces on foam stability. The study observes distinct foam lifetime regimes and reveals unique coalescence behavior in PVA foams.
Article
Instruments & Instrumentation
Y. Summer Tein, Benjamin R. Thompson, Chuck Majkrzak, Brian Maranville, Damian Renggli, Jan Vermant, Norman J. Wagner
Summary: Understanding the structure-property relationship of complex fluid-fluid interfaces is crucial for designing systems with targeted interfacial properties. This article presents a new instrument capable of controlled interfacial dilation and shear kinematics, combined with in situ microscopy and neutron reflectometry for detailed structural measurements of the interface at the mesoscale and nanoscale.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Chemistry, Multidisciplinary
Caitlin V. Wood, Vladimir I. Razinkov, Wei Qi, Christopher J. Roberts, Jan Vermant, Eric M. Furst
Summary: When monoclonal antibodies come into contact with air-water interface, they tend to form aggregates, which has negative effects on their performance. So far, it has been challenging to detect and characterize interfacial aggregation. In this study, the mechanical response induced by interfacial adsorption was examined by measuring the interfacial shear rheology of a model antibody, AS-IgG1, at the air-water interface. The results revealed that strong viscoelastic layers of AS-IgG1 were formed upon protein adsorption, and the compliance of the interfacial protein layer was found to be correlated with the pH and concentration of the bulk solution.
Article
Engineering, Chemical
Mariana Rodriguez-Hakim, Luka Oblak, Jan Vermant
Summary: Stable foams have important applications, but legislative initiatives restrict the use of surface active materials. This study presents an innovative foaming technology that produces ultrastable foams through particle densification. The foams, stabilized by aqueous nanosilica, have excellent mechanical resistance to maintain stability. These nanosilica foams are tested in concrete applications, showing improved freeze-thaw resistance and material strength. The stability criterion derived from interfacial rheological properties can be applied to other complex interfaces.
ACS ENGINEERING AU
(2023)
Article
Mechanics
Stelios Alexandris, Daniel Ashkenazi, Jan Vermant, Dimitris Vlassopoulos, Moshe Gottlieb
Summary: When surface-active molecules or particles assemble at fluid-fluid interfaces, the rheological properties of these interfaces become complex, which plays an important role in processes involving interface flow and deformation. However, measuring interfacial rheological properties of polymers at the air-water interface is challenging due to various factors such as weak interactions with the water subphase, polymer backbone conformation, glass transition of the interfacial layer, and memory effects. In this study, we conducted systematic rheological measurements of polymer-laden interfaces and compared the results obtained by different types of rheometers. We found that the reproducibility and comparability of the rheological data were poor, mainly due to differences in layer preparation methods. Therefore, it is crucial to control the surface pressure and use a specific method to prepare the layers in order to obtain reliable and meaningful rheological data.
JOURNAL OF RHEOLOGY
(2023)
Article
Multidisciplinary Sciences
Florence J. Mueller, Lucio Isa, Jan Vermant
Summary: In this study, an innovative approach to improve colloidal gels by introducing surface roughness to the particles is proposed, resulting in enhanced toughness and self-healing properties. The functionalized rough particle gels show potential for various applications, such as xerogel fabrication and high-fidelity extrusion 3D-printing.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Marcel Rey, Jannis Kolker, James A. Richards, Isha Malhotra, Thomas S. Glen, N. Y. Denise Li, Fraser H. J. Laidlaw, Damian Renggli, Jan Vermant, Andrew B. Schofield, Syuji Fujii, Hartmut Loewen, Paul S. Clegg
Summary: This study investigates the effect of individual microgel morphology on the destabilization of responsive emulsions. The polymeric properties of microgels enable stimuli-responsive behavior while the colloidal properties provide long-term stability to the emulsions.
NATURE COMMUNICATIONS
(2023)
Article
Biology
Steffen Geisel, Eleonora Secchi, Jan Vermant
Summary: Bacterial biofilms are communities living in a matrix of extracellular polymeric substances. They provide protection against antibiotics and stress factors, and play a role in spreading and colonization. Understanding the mechanical properties of biofilms is crucial for controlling and combating them. This study compared different measurement techniques to investigate the influence of growth and measurement conditions on biofilm mechanics.
Article
Chemistry, Physical
Yiping Yin, Zhe Wang, Hua Zou
Summary: This study presents a novel method for preparing dimpled polymer-silica nanocomposite particles using interfacial swelling-based seeded polymerization. The optimized conditions allow for a relatively high percentage of dimpled particles to be achieved.
Article
Chemistry, Physical
Brenden D. Hoehn, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: Porous materials with nanometer-scale pores have important applications as nanoporous membranes. In this study, ABA triblock copolymers were used as precursors to produce nanoporous polymeric membranes (NPMs) in thin film form by degrading the end blocks. Polycyclooctene (PCOE) NPMs with tunable pore sizes were successfully prepared using solvent casting technique. Oxygen plasma etching was employed to improve the surface porosity and hydrophilicity of the membranes. This study provides a straightforward method to produce tough NPMs with high porosity and hydrophilic surface properties.
Article
Chemistry, Physical
Vladislav S. Petrovskii, Stepan I. Zholudev, Igor I. Potemkin
Summary: This article investigates the behavior of linear and ring polypeptide chains in aqueous solution and explores the properties of the complexes formed by these chains with oppositely charged surfactants. The results demonstrate that the complexes of linear supercharged unfolded polypeptides and the corresponding surfactants exhibit impressive adhesive properties.
Article
Chemistry, Physical
Merve Cevik, Serkan Dikici
Summary: Cardiovascular diseases are a leading cause of death globally, and vascular grafts are a promising treatment option. This study focuses on tissue-engineered vascular grafts (TEVGs) using decellularized parsley stems as a potential biomaterial. The decellularized parsley stems showed suitable properties for TEVGs, providing a suitable environment for human endothelial cells to form a pseudo endothelium. This study showcases the potential of using parsley stems for TEVGs.
Article
Chemistry, Physical
Gustavo A. Vasquez-Montoya, Tadej Emersic, Noe Atzin, Antonio Tavera-Vazquez, Ali Mozaffari, Rui Zhang, Orlando Guzman, Alexey Snezhko, Paul F. Nealey, Juan J. de Pablo
Summary: The optical properties of liquid crystals are typically controlled by electric fields. In this study, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and optical response of nematic liquid crystals. We identify several previously unknown structures and explain them through calculations and simulations. These findings hold promise for the development of new systems combining sound, flow, and confinement.
Article
Chemistry, Physical
Xinjun Wu, Xin Guan, Shushu Chen, Jiangpeng Jia, Chongyi Chen, Jiawei Zhang, Chuanzhuang Zhao
Summary: This research presents a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery behavior. The hydrogel is prepared using specific treatment methods to achieve shape fixation by heating and shape recovery by cooling. Additionally, deformable devices can be obtained by assembling hydrogel blocks with different concentrations.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Ningyi Li, Junhong Li, Lijingting Qing, Shicheng Ma, Yao Li, Baohui Li
Summary: This paper investigates the self-assembly behavior of colloids with competing interactions under spherical confinement and finds that different ordered structures can be formed under different sized spherical confinements. Moreover, more perforated structures are formed in smaller spheres.
