Article
Engineering, Chemical
Xiao Chen, K. B. Goh
Summary: This study presents a lattice-based molecular model to investigate the competitive sorption of monovalent and divalent ions in ion-exchange membranes. The model quantifies the ion sorption and coion repulsion, allowing for the understanding of ion partitioning and pairing site saturation. The results show that the competitive ion partitioning is highly influenced by entropy change, binding energy, osmotic pressure, and electrostatic interaction. These factors explain the favorable sorption of divalent counterions in cation-exchange membranes and monovalent counterions in anion ones, as previously reported.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Materials Science, Ceramics
Monika Kazancioglu, Richard Lehman, Thomas Emge, Masanori Hara
Summary: Silicate polymers containing both monovalent and divalent ions were synthesized using a new method. The addition of divalent ions reduced the hygroscopicity of the silicates, similar to the effect of adding Ca2+ ions to Na+ glass. Water vapor acted as a plasticizer for the silicate polymer until saturation, while an ionic liquid could act as a plasticizer beyond this limit through cation exchange reactions. The reduction of Tg value was found to be greater when the ionic liquid had better compatibility with the ionic groups, the monovalent-ion content in the glass was higher, and higher pressure was applied during compression molding. The reasons for these behaviors were discussed.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Tianchi Cao, Menachem Elimelech
Summary: The aggregation kinetics and surface charging properties of rod-like sulfated cellulose nanocrystals (CNCs) in aqueous suspensions with monovalent, divalent, or trivalent inorganic salts were investigated. The phenomenon of charge neutralization and charge reversal was observed with divalent and trivalent salts, impacting the colloidal stability of the CNCs significantly. These findings have important implications for applications of CNCs in nanotechnology and materials science.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Applied
Yu Kang, Xinyue Zhao, Xintong Han, Xiangling Ji, Quan Chen, Harald Pasch, Albena Lederer, Yonggang Liu
Summary: The conformation of chitosan in acetate buffer at low ionic strength was studied using asymmetric flow field-flow fractionation (AF4). The results showed that the size of chitosan decreases with increasing ionic strength, with the persistence length decreasing linearly with the Debye screening length.
CARBOHYDRATE POLYMERS
(2021)
Article
Biochemical Research Methods
Corbin J. England, Tanner C. Gray, Shubha R. L. Malla, Samantha A. Oliveira, Benjamin R. Martin, Gary W. Beall, L. Kevin Lewis
Summary: The precipitation of double-stranded DNA by group 2 metals at high pH levels was effective, particularly with calcium, leading to the retention of DNA structural integrity in the precipitates formed. Neutralization of negative surface charges and cation bridging were proposed as mechanisms for this process.
ANALYTICAL BIOCHEMISTRY
(2021)
Article
Chemistry, Physical
Martina Jezkova, Petr Jelinek, Ivana Sloufova, Miroslav Soos
Summary: Gold snowflake-like particles were prepared via chemical reduction using inorganic salts, showing enhanced electro-optical behavior. The addition of inorganic salts and specific concentration ratios played a key role in determining the size and morphology of the particles. Various reaction parameters were systematically tested to understand their influence on the shape development of the gold particles. A trapping method was developed to efficiently collect individual particles without damaging their surface structure, and their enhanced electro-optical behavior was confirmed through surface-enhanced Raman spectroscopy.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Civil
Arvind Kumar Shivanshi, Arvind Kumar Jha, Mohammad Parwez Akhtar
Summary: The impact of wetting-drying cycles on the behavior of lime treated soil exposed to sulphate contamination is investigated. The results show that the strength of lime treated soil is significantly influenced by sulphate concentration, types of sulphate compound, curing periods, and number of wetting-drying cycles. Adverse effects on strength and durability are pronounced at sulphate concentrations higher than 16000 ppm. Experimental results are further elucidated with physicochemical behavior and microanalyses.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Materials Science, Multidisciplinary
Marianna Mamusa, David Chelazzi, Michele Baglioni, Sergio Murgia, Emiliano Fratini, David Rivillo, Piet W. N. M. van Leeuwen, Henri S. Schrekker, Piero Baglioni
Summary: Solutions of weakly coordinating ionic liquids (ILs) in alkyl carbonates have attracted attention due to their green solvents properties, but the understanding of ILs' phase behavior and structure in organic polar solvents is lacking. This study investigates the interactions and nanoscale structure of a specific IL, [BMIm][BARF], in alkyl carbonate solvents. The results show that [BMIm][BARF] is mostly undissociated in these solvents and the presence of rod-like nanostructures in the IL/solvent mixtures. The study also reveals that the self-assembly of nano-sized structures is hindered by slower ion diffusion in alkyl carbonates with lower dielectric constants. The findings have implications in various fields including batteries, catalysis, extraction, and bio-applications.
APPLIED MATERIALS TODAY
(2023)
Article
Chemistry, Physical
Hiroshi Abe, Yuto Yoshiichi, Hiroaki Kishimura
Summary: Hydrogen/deuterium exchange in hydrophobic ionic liquid-propanol solutions was investigated by Raman spectroscopy. The study found that the type of ionic liquid and additives had an influence on the H/D exchange process.
Article
Engineering, Environmental
Hojae Song, Hyeonyong Chung, Kyoungphile Nam
Summary: The solutions of calcium and potassium ions were effective in removing strontium and cesium from soil near a nuclear power plant, while the solutions of magnesium and ammonium ions performed poorly. This difference may be due to the physicochemical similarities between calcium and strontium, as well as potassium and cesium.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Irina A. Sergeeva, Dmitry Klinov, Tilman E. Schaeffer, Evgeniy Dubrovin
Summary: The effect of Cr3+ treatment on the conformation and hydrodynamic properties of collagen was studied using AFM and DLS. The results showed an increase in flexibility and protein aggregation when collagen was treated with chromium (III) salt solutions. The aggregation kinetics of collagen were found to be dependent on the ionic strength. These findings provide new insights into the influence of chromium salts on the conformation and properties of collagen molecules.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Thermodynamics
Isabela Sales, Dinis. O. Abranches, Tania E. Sintra, Silvana Mattedi, Mara G. Freire, Joao A. P. Coutinho, Simao P. Pinho
Summary: This study investigates the impact of different solvents on the solubility of artemisinin. The results show that solvent properties, particularly the nonpolar factor and hydrogen bond acceptor character of the solvent, play an important role in enhancing the solubility. The model developed in this study accurately predicts the effects of solvent concentration and solvent properties on the solubility enhancement of artemisinin.
FLUID PHASE EQUILIBRIA
(2022)
Article
Physics, Fluids & Plasmas
Sarah N. Innes-Gold, David R. Jacobson, Philip A. Pincus, Mark J. Stevens, Omar A. Saleh
Summary: The study investigates the local stiffness of flexible biopolymers under varying salt conditions through high-precision single-molecule elasticity measurements. It reveals a power-law scaling relationship between the electrostatic persistence length and ionic strength in monovalent salt solutions, and a regime in mixed salt solutions where the stiffness of PEs is not affected by the addition of monovalent salt. This is attributed to a surrounding jacket of ions regulating the chain's effective charge density as ionic strength changes.
Article
Chemistry, Physical
Hiroshi Abe, Fumiya Nemoto, Kosuke Hiroi, Kazuki Ohishi, Shinichi Takata
Summary: In this study, the spontaneous formation of monodispersive nanoconfined water in hydrophilic ionic liquid was investigated. The presence and behavior of water pocket in the ionic liquid were characterized using small-angle neutron scattering, revealing the dependence on water concentration and temperature. The findings contribute to a better understanding of the behavior and properties of water in ionic liquids.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Polymer Science
Joseph B. Schlenoff, Khalil Akkaoui
Summary: By studying polyelectrolyte complexes, a simple analytical expression has been derived to quantitatively model the relaxation of amorphous polymers from T-g to higher temperatures, advancing the understanding and utilization of the glass-forming phenomenon.
Article
Genetics & Heredity
Annael Brunet, Frida Forsberg, Qiong Fan, Thomas Saether, Philippe Collas
FRONTIERS IN GENETICS
(2019)
Article
Biochemical Research Methods
Yves-Marie Boudehen, Maximilian Wallat, Philippe Rousseau, Olivier Neyrolles, Claude Gutierrez
Article
Chemistry, Physical
Julie Cornet, Nicolas Destainville, Manoel Manghi
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Multidisciplinary Sciences
Estelle Crozat, Catherine Tardin, Maya Salhi, Philippe Rousseau, Armand Lablaine, Tommaso Bertoni, David Holcman, Bianca Sclavi, Pietro Cicuta, Francois Cornet
NATURE COMMUNICATIONS
(2020)
Article
Cell Biology
Annael Brunet, Nicolas Destainville, Philippe Collas
Summary: The study utilized polymer simulations to investigate how physical parameters of chromatin affect its interactions with the nuclear lamina. It found that polymer stiffness has a greater impact on configurations at the lamina compared to stretching, leading to extended interactions and desorbed regions. The presence of an attraction potential results in persistent interaction and adsorption-desorption regimes, modulated by polymer stiffness and stretching.
Article
Chemistry, Physical
Manoel Manghi, John Palmeri, Francois Henn, Adrien Noury, Fabien Picaud, Guillaume Herlem, Vincent Jourdain
Summary: The field of ion transport through carbon nanotubes is characterized by varying reported values and uncertainties regarding channel and access resistances. By comparing experimental data with nanofluidic models, it is possible to determine the conditions under which different resistances predominate in CNTs. Most experimental conductance values can be explained by considering variations in slip length and surface charge density, but a few exceptionally high values cannot be accounted for even with extreme parameter values. Improving existing models and enhancing the statistical reliability of experimental data are important for the advancement of research in this field.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Alia Mejri, Kamel Mazouzi, Guillaume Herlem, Fabien Picaud, Theo Hennequin, John Palmeri, Manoel Manghi
Summary: Ultra-efficient transport of water and ions at the nanoscale is studied through molecular dynamics simulations. Carbon nanotubes are used as nanofluidic devices, and the transport of solvated ions inside the nanotubes is found to be dependent on the geometric parameters of the carbon structure and the water models used.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Biophysics
Julie Cornet, Pascal Preira, Laurence Salome, Frederic Daumas, Bernard Lagane, Nicolas Destainville, Manoel Manghi, Fabrice Dumas
Summary: In cell membranes, submicrometric nanodomains composed of proteins and lipids play important roles in specific functions. However, the detailed morphology of these nanodomains remains unknown. This study combines analytical calculations and Monte Carlo simulations to show that increasing protein concentration results in the elongation of membrane nanodomains. The findings suggest that protein abundance can modulate nanodomain shape and potentially impact their biological function.
BIOPHYSICAL JOURNAL
(2023)
Meeting Abstract
Biophysics
Julie Cornet, Matthieu Chavent, Manoel Manghi, Nicolas Destainville
BIOPHYSICAL JOURNAL
(2020)
Article
Physics, Fluids & Plasmas
Francois Sicard, Nicolas Destainville, Philippe Rousseau, Catherine Tardin, Manoel Manghi
Meeting Abstract
Biophysics
S. Guilbaud, L. Salome, N. Destainville, M. Manghi, C. Tardin
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
(2019)
Meeting Abstract
Biophysics
S. Guilbaud, L. Salome, N. Destainville, M. Manghi, C. Tardin
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
(2019)
Meeting Abstract
Biophysics
J. Cornet, M. Chavent, M. Manghi, N. Destainville
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
(2019)
Article
Physics, Fluids & Plasmas
Theo Hennequin, Manoel Manghi, John Palmeri
Summary: The recent study on the dielectric constant of water confined in nanometric slit pores sheds light on the interplay between different physical mechanisms for ion partitioning in nanopores. The role of the Born contribution in inducing ionic liquid-vapor phase separation is explored, showing that the abrupt change in the dielectric contribution of the potential of mean force with Debye-Huckel screening parameters favors this transition. By establishing phase diagrams and monitoring osmotic pressure, the study reveals the competition between exclusion effects and electrostatic attraction in charged nanopores, providing insights for experiments and simulations on ionic transport through nanopores.