Article
Chemistry, Physical
Leekang Jeon, Yurim Kim, Jongsun Yoon, Hanjin Seo, Hyomin Lee
Summary: A one-step microfluidic approach was used to prepare pH-responsive microcapsules through interfacial complexation of hydrogen bonding polymers. Polymeric microcapsules with an aqueous core and a shell of complementary hydrogen bonding polymers were prepared using triple-emulsion droplets as templates. The resulting PPO/PMAA microcapsules showed stability at high salt concentrations and released the encapsulated protein above the critical pH.
Article
Chemistry, Physical
Hao Tan, Soo -Young Park
Summary: A new approach to generate pH-responsive microcapsules through in-situ photopolymerization in water-in-water-in-oil double emulsion droplets was developed. The microfluidic preparation method used two immiscible water solutions obtained from an aqueous two-phase system. The microcapsules showed smart response to pH change, recyclability, and efficient cargo loading and releasing properties.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Applied
Yaowen Liu, Yanlan Ma, Yan Liu, Jinlu Zhang, Md Alomgir Hossen, Dur E. Sameen, Jianwu Dai, Suqing Li, Wen Qin
Summary: Intelligent packaging for detecting food spoilage is in demand, and in this study, gelatin and chitosan were used to prepare microcapsules for monitoring food freshness. The microcapsules showed enhanced thermal stability and controlled release of curcumin, which enabled sustainable pH-change sensing and colorimetric indicator capability for monitoring pork deterioration during storage.
FOOD HYDROCOLLOIDS
(2022)
Article
Chemistry, Analytical
Daniela A. Oliveira, Suleiman Althawab, Eric S. McLamore, Carmen L. Gomes
Summary: A label-free and rapid electrochemical biosensor for detecting Listeria monocytogenes was developed using a one-step simultaneous sonoelectrodeposition of platinum and chitosan. The sensor showed optimized deposition on the electrode surface, leading to significantly increased electroactive surface area. Functionalized with aptamers selective for L. monocytogenes capture, the aptasensor demonstrated high selectivity and sensitivity in detecting the bacteria quickly and efficiently.
Article
Engineering, Biomedical
Sara Vilabril, Sara Nadine, Catarina M. S. S. Neves, Clara R. Correia, Mara G. Freire, Joao A. P. Coutinho, Mariana B. Oliveira, Joao F. Mano
Summary: The study describes the one-step fast formation of robust polymeric capsules through interfacial complexation of oppositely charged polyelectrolytes in an all-aqueous environment, which is compatible with the encapsulation of mesenchymal stem/stromal cells (MSCs) and microcarriers. Cell aggregation and secretion over time can be tailored by providing cells with static or dynamic (bioreactor) environments.
ADVANCED HEALTHCARE MATERIALS
(2021)
Article
Chemistry, Applied
Ruoyi Xu, Weijun Deng, Yunlu Dai, Jing Hu
Summary: This study successfully addressed the issue of rapid evaporation and oxidation of citral by constructing citral microcapsules. These microcapsules exhibited pH-responsive release and antioxidant properties, resulting in excellent sensory profile and antibacterial effects.
Article
Energy & Fuels
Narudee Srisawang, Amorn Chaiyasat, Piyalak Ngernchuklin, Preeyaporn Chaiyasat
Summary: Microcapsules containing bismuth vanadate (BiVO4) and magnetite (Fe3O4) nanoparticles were prepared by microsuspension iodine transfer polymerization (ms ITP) for dye treatment in wastewater. These microcapsules showed high efficiency in removing dyes, especially under alkaline conditions, and could be reused for at least five treatment times with the help of an external magnetic field.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Renuka Subhash Patil, Erol Sancaktar
Summary: pH-responsive smart gating membranes were fabricated using a two-step process of grafting poly(acrylic acid) hydrogel onto porous polyimide support membrane with ordered pores using a 248 nm KrF excimer laser. The membranes showed significant permeability changes at pH 7 and pH 3 due to swelling and deswelling of the hydrogel, confirming their potential application in drug delivery devices. The fabrication method was found to be fast, efficient, solvent-free, and cost-effective, suggesting its feasibility for industrial applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Chao Wang, Hui Chi, Fan Zhang, Xinyue Wang, Jiarui Wang, Hao Zhang, Ying Liu, Xiaona Huang, Yungang Bai, Kun Xu, Pixin Wang
Summary: The field of biocatalysis is expanding due to the increasing demand for efficient low-cost green chemical processes. A controllable scaffold, thermoresponsive Pickering high internal phase emulsions (HIPEs), has been developed for efficient biocatalysis. The HIPEs demonstrate a transition between emulsification and demulsification depending on temperature. This system provides a green platform for various interfacial biocatalytic processes of industrial interest.
Article
Chemistry, Physical
Tongyu Zhu, Wanli Kang, Hongbin Yang, Zhe Li, Tongyu Wang, Yuheng Fan, Xin Kang, Ruxue Jia, Ibrashev Kenzhebek, Miras Issakhov
Summary: A pH-responsive surfactant was constructed based on dynamic imine bond for emulsification function of chemical flooding and demulsification of produced fluid in heavy oilfield. The emulsifier system showed strong emulsification and IFT reduction ability under pH = 12, and rapid demulsification property under pH = 5.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Multidisciplinary
Xinghuan Lin, Shanshan Li, Yingfeng Wang, Xiaojian Yang, Joonhoo Jung, Zhiguang Li, Xuehong Ren, Yuyu Sun
Summary: This study developed biodegradable fibrous membranes with antibacterial properties by electrospinning, displaying significant antimicrobial efficacy against specific bacteria after surface treatment. The membranes also exhibited good thrombogenicity and hydrophobicity, suggesting potential for application in biomedical materials.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Gaihuan Ren, Bo Li, Lulu Ren, Dongxu Lu, Pan Zhang, Lulu Tian, Wenwen Di, Weili Shao, Jianxin He, Dejun Sun
Summary: This study introduces a surfactant T-DBA with dynamic imine bonds that can control the stability of nanoemulsions in response to pH, allowing for the turning on and off of nanoemulsions. Such intelligent control could have applications in processes like heavy oil recovery and interfacial reactions.
Article
Biophysics
Padryk Merkl, Marie-Stephanie Aschtgen, Birgitta Henriques-Normark, Georgios A. Sotiriou
Summary: Biofilms are dense bacterial colonies that adhere to medical device surfaces and contribute significantly to infections. Antibiotics have limited effectiveness against bacterial biofilms due to poor diffusion through the extracellular polymeric substances. A novel inorganic pH responsive system can determine biofilm acidity through fluorescence measurements.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Engineering, Environmental
Bo Liu, Jianghua Li, Zhongtian Zhang, James D. Roland, Bruce P. Lee
Summary: This study presents a novel hydrogel with pH responsive antibacterial activity. The hydrogel contains a pH responsive and reversible catechol-boronate linkage, which exhibits antimicrobial property under acidic conditions and becomes non-cytotoxic under basic conditions. The hydrogel can recover its antibacterial property when exposed to acidic pH. The strategy using catechol-Cl and phenylboronic acid provides a new approach for designing hydrogels with pH responsive antibacterial activity and reduced cytotoxicity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Polymer Science
Zhang Wu, Joerg G. Werner, David A. Weitz
Summary: In this study, an asymmetric microcapsule shell architecture was designed to achieve a good combination of desired features, obtained from water-in-oil-in-water double emulsion drops with a graded macroporous shell and dense skin separation layer.
Article
Mechanics
Vincent Bertin, Yacine Amarouchene, Elie Raphael, Thomas Salez
Summary: In this article, we derive a soft-lubrication model to compute the forces and torque experienced by a rigid sphere near an elastic wall. The model focuses on small deformations of the surface and uses perturbation analysis. The response of planar elastic substrates is computed in the framework of linear elasticity, and the elastohydrodynamic forces are obtained analytically using the Lorentz reciprocal theorem.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Polymer Science
K. Kadri, J. Peixinho, T. Salez, G. Miquelard-Garnier, C. Sollogoub
Summary: This paper provides new insights into the stability of thin polymer films under shear, demonstrating the impact of shear rate on the rupture behavior, with findings of delayed rupture at low shear rates, suppressed rupture at high shear rates, and a transient state where shear and van der Waals forces balance each other. Linear analysis suffices to describe rupture time in the absence of shear, while nonlinearities are crucial in the presence of shear.
Article
Physics, Applied
Zaicheng Zhang, Muhammad Arshad, Vincent Bertin, Samir Almohamad, Elie Raphael, Thomas Salez, Abdelhamid Maali
Summary: This study reports a contactless method to measure the viscoelastic rheological properties of soft gels, and demonstrates the elastohydrodynamic coupling between flow induced by probe oscillation and viscoelastic deformation of the gels.
PHYSICAL REVIEW APPLIED
(2022)
Article
Polymer Science
Malak Alaa Eddine, Sabrina Belbekhouche, Sixtine de Chateauneuf-Randon, Thomas Salez, Artem Kovalenko, Bruno Bresson, Cecile Monteux
Summary: Hydrogel membranes have emerged as promising systems for filtration applications. By adding polyethylene glycol (PEG) chains, the water permeability of the membranes can be controlled. The highest water permeability is achieved when the PEG concentration reaches its critical overlap concentration. Additionally, the flow rate of water through the membranes varies nonlinearly with pressure, due to the deformability of the membranes.
Article
Physics, Multidisciplinary
Alexandre Vilquin, Vincent Bertin, Elie Raphael, David S. Dean, Thomas Salez, Joshua D. McGraw
Summary: This study focuses on the spatial distribution and dispersion of charged nanoparticles in near-surface shear flows under the influence of electrostatic repulsion and absorption. By varying electrolyte concentrations, the electrostatic repulsion between particles and the charged surface can be adjusted. The particles leaving the field of vision are excluded from further analysis, making the experimental ensemble equivalent to Taylor dispersion with absorption. These two factors significantly modify the particle distribution and lead to a tenfold reduction in the spreading dynamics compared to the noninteracting case.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Raphael Saiseau, Christian Pedersen, Anwar Benjana, Andreas Carlson, Ulysse Delabre, Thomas Salez, Jean-Pierre Delville
Summary: This study investigates the spreading of droplets in a near-critical phase-separated liquid mixture. The researchers verified the robustness of Tanner's law, which describes the spreading of viscous droplets, when the critical temperature is neared. It was also found that the precursor film thickness decreases when approaching the critical temperature.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Haggai Bonneau, Maxence Arutkin, Rainni Chen, James A. Forrest, Elie Raphael, Thomas Salez
Summary: Thin polymer films with high molecular weights show an unusual decrease in the glass-transition temperature as the film thickness decreases. The sliding mechanism proposed by De Gennes does not explain the observed features in experiments.
EUROPEAN PHYSICAL JOURNAL E
(2023)
Article
Chemistry, Physical
Elodie Millan, Maxime Lavaud, Yacine Amarouchene, Thomas Salez
Summary: Brownian motion is a fundamental concept in science, and the study of its effects in confined spaces has gained increasing attention. When a particle is confined near a wall, its motion is significantly slower due to friction. This confinement-induced slowdown results in the appearance of multiplicative noises and non-Gaussianities, which are difficult to accurately analyze.
EUROPEAN PHYSICAL JOURNAL E
(2023)
Article
Chemistry, Physical
Junjie Yin, Christian Pedersen, Michael F. Thees, Andreas Carlson, Thomas Salez, James A. Forrest
Summary: We studied the liquid-like response of vapor-deposited glassy films of polystyrene with gold nanoparticles on the surface. The buildup of polymer material was measured over time and temperature for both as-deposited and rejuvenated films. The surface evolution of the films followed the characteristic power law of capillary-driven surface flows and showed enhanced behavior compared to bulk. The measured relaxation times and particle embedding provided insights into surface mobility and bulk dynamics.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Arthur Alexandre, Maxime Lavaud, Nicolas Fares, Elodie Millan, Yann Louyer, Thomas Salez, Yacine Amarouchene, Thomas Guerin, David S. Dean
Summary: This study investigates the diffusion of particles in single-wall and double-wall planar channel geometries with a dependence of local diffusivities on the distance to the boundaries. The displacement parallel to the walls is Brownian but non-Gaussian, exhibiting a nonzero fourth cumulant. The fourth cumulant and the tails of the displacement distribution are calculated, incorporating diffusivity tensors and potentials generated by the walls or external factors like gravity. Experimental and numerical studies confirm the accuracy of the predicted fourth cumulants, while surprising findings indicate that the tails of the displacement distribution are Gaussian rather than exponential. Overall, this research provides important insights and constraints for understanding force maps and local transport properties near surfaces.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Caroline Kopecz-Muller, Vincent Bertin, Elie Raphael, Joshua D. McGraw, Thomas Salez
Summary: When a rigid object approaches a soft material in a viscous fluid, hydrodynamic stresses deform the soft material, leading to a soft-lubrication coupling. In addition, soft elastomers and gels are often porous, which further complicates the description due to their permeability to the surrounding fluid. This study focuses on the point-force response of a permeable poroelastic substrate and its application in contactless colloidal-probe methods.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Chemistry, Physical
Arnaud Saint-Jalmes, Corentin Tregouet
Summary: This study investigates the impact of continuous flow on the coarsening dynamics of foams and introduces a new experimental protocol to monitor the relative variation of bubble size over time. The results show that the coarsening rate of foam is strongly affected by the applied shear rate, with a continuous reduction above a critical shear rate. This reduction is attributed to the out-of-equilibrium and shear-dependent film thickness.
Article
Physics, Multidisciplinary
Denis Dumont, Haggai Bonneau, Thomas Salez, Elie Raphael, Pascal Damman
Summary: Macroscopic and microscopic properties of dense granular flows on inclined planes are investigated using Discrete-Element-Method simulations. The simulations include both frictionless and frictional grains, and reveal the occurrence of a critical stress, the Bagnold velocity profile, and well-defined friction and dilatancy laws in dense granular flows. Analysis of the microscopic grain motion shows the formation of transient clusters, and a theoretical scaling model is derived without any empirical input, providing a quantitative explanation for the fundamental laws of dense granular flows.
PHYSICAL REVIEW RESEARCH
(2023)
Review
Chemistry, Physical
Lionel Bureau, Gwennou Coupier, Thomas Salez
Summary: The aim of this review is to analyze and gather literature on the impact of boundary effects on lift forces, in order to facilitate discussion within the associated communities and guide future research.
EUROPEAN PHYSICAL JOURNAL E
(2023)
Article
Chemistry, Physical
Jean-Christophe Ono-Dit-Biot, Pierre Soulard, Solomon Barkley, Eric R. Weeks, Thomas Salez, Elie Raphael, Kari Dalnoki-Veress
Summary: This study investigates the elastic and yielding properties of defect-free mono-crystals made of highly monodisperse droplets. The crystals undergo successive row-reduction transitions as they are compressed, eventually fracturing in a catastrophic event. The elastic properties are captured by a simple analytical model of capillary springs, while the yielding properties are described by a minimal bond breaking model.
