Subjects -> CHEMISTRY (Total: 928 journals)     - ANALYTICAL CHEMISTRY (59 journals)    - CHEMISTRY (661 journals)    - CRYSTALLOGRAPHY (23 journals)    - ELECTROCHEMISTRY (28 journals)    - INORGANIC CHEMISTRY (45 journals)    - ORGANIC CHEMISTRY (47 journals)    - PHYSICAL CHEMISTRY (65 journals) PHYSICAL CHEMISTRY (65 journals)
 Showing 1 - 64 of 64 Journals sorted alphabetically ACS Central Science       (Followers: 9) ACS Physical Chemistry Au       (Followers: 7) ACS Sensors       (Followers: 7) Acta Physico-Chimica Sinica Advances in Image and Video Processing       (Followers: 20) Advances in Physical Chemistry       (Followers: 13) Annual Review of Physical Chemistry       (Followers: 14) Applied Materials Today       (Followers: 1) Biophysical Chemistry       (Followers: 8) Catalysis, Structure & Reactivity       (Followers: 2) Chemical Physics       (Followers: 18) Chemical Physics Letters       (Followers: 17) Chemistry and Physics of Lipids       (Followers: 2) Chinese Journal of Chemical Physics       (Followers: 1) Colloids and Surfaces A: Physicochemical and Engineering Aspects       (Followers: 6) Current Physical Chemistry       (Followers: 1) Doklady Physical Chemistry EPJ B - Condensed Matter and Complex Systems       (Followers: 1) EPJ E - Soft Matter and Biological Physics       (Followers: 3) Friction       (Followers: 4) Geochemistry, Geophysics, Geosystems       (Followers: 35) Glass Physics and Chemistry       (Followers: 1) Handbook on the Physics and Chemistry of Rare Earths       (Followers: 2) Indian Journal of Biochemistry and Biophysics (IJBB)       (Followers: 3) Indian Journal of Chemistry - Section A       (Followers: 9) International Journal of Polymeric Materials       (Followers: 6) International Journal of Quantum Chemistry       (Followers: 5) International Reviews in Physical Chemistry       (Followers: 3) Journal of Biophysical Chemistry       (Followers: 3) Journal of Chemical Physics       (Followers: 36) Journal of Chromatographic Science       (Followers: 15) Journal of Macromolecular Science, Part B: Physics       (Followers: 2) Journal of Physical and Chemical Reference Data       (Followers: 4) Journal of Physical Chemistry A       (Followers: 28) Journal of Physical Chemistry B       (Followers: 48) Journal of Physical Chemistry C       (Followers: 36) Journal of Physical Chemistry Letters       (Followers: 26) Journal of Physics and Chemistry of Solids       (Followers: 3) Journal of Quantum Chemistry       (Followers: 1) Journal of Radiation Research       (Followers: 3) Macromolecular Chemistry and Physics       (Followers: 2) Molecular Physics: An International Journal in the Field of Chemical Physics       (Followers: 24) Nature Communications       (Followers: 322) Open Journal of Physical Chemistry Physical Chemistry       (Followers: 2) Physical Chemistry Chemical Physics       (Followers: 29) Physical Chemistry Research       (Followers: 1) Physical Review A       (Followers: 23) Physical Review Accelerators and Beams       (Followers: 3) Physical Review B       (Followers: 33) Physical Review D       (Followers: 11) Physical Review E       (Followers: 41) Physical Review Letters       (Followers: 134) Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B Physics and Chemistry of Liquids: An International Journal Physics and Chemistry of the Earth, Parts A/B/C       (Followers: 10) Plasma Processes and Polymers       (Followers: 2) Protection of Metals and Physical Chemistry of Surfaces       (Followers: 15) Revista Fuentes Russian Journal of Physical Chemistry A, Focus on Chemistry Russian Journal of Physical Chemistry B, Focus on Physics Solid State Ionics       (Followers: 5) The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics       (Followers: 29) The European Physical Journal Special Topics       (Followers: 1)
Similar Journals
 EPJ E - Soft Matter and Biological PhysicsJournal Prestige (SJR): 0.489 Citation Impact (citeScore): 1Number of Followers: 3      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1292-8941 - ISSN (Online) 1292-895X Published by Springer-Verlag  [2469 journals]
• Actomyosin contractility requirements and reciprocal cell–tissue
mechanics for cancer cell invasion through collagen-based channels

Abstract: The interstitial tumor microenvironment is composed of heterogeneously organized collagen-rich porous networks as well as channel-like structures and interfaces which provide both barriers and guidance for invading cells. Tumor cells invading 3D random porous collagen networks depend upon actomyosin contractility to deform and translocate the nucleus, whereas Rho/Rho-associated kinase-dependent contractility is largely dispensable for migration in stiff capillary-like confining microtracks. To investigate whether this dichotomy of actomyosin contractility dependence also applies to physiological, deformable linear collagen environments, we developed nearly barrier-free collagen-scaffold microtracks of varying cross section using two-photon laser ablation. Both very narrow and wide tracks supported single-cell migration by either outward pushing of collagen up to four times when tracks were narrow, or cell pulling on collagen walls down to 50% of the original diameter by traction forces of up to 40 nN when tracks were wide, resulting in track widths optimized to single-cell diameter. Targeting actomyosin contractility by synthetic inhibitors increased cell elongation and nuclear shape change in narrow tracks and abolished cell-mediated deformation of both wide and narrow tracks. Accordingly, migration speeds in all channel widths reduced, with migration rates of around 45-65% of the original speed persisting. Together, the data suggest that cells engage actomyosin contraction to reciprocally adjust both own morphology and linear track width to optimal size for effective cellular locomotion. Graphic abstract
PubDate: 2022-05-16

• Translation–deformation coupling effects on the Rayleigh instability of
an electrodynamically levitated charged droplet

Abstract: The breakup pathway of the Rayleigh fission process observed in the past experiments carried out using high-speed imaging of a charged drop levitated in an AC quadrupole trap has shown to exhibit several cycles of shape and center-of-mass oscillations followed by asymmetric breakup by ejecting a jet in the upward direction (i.e., opposite to the direction of gravity). We recently attempted to explain this using boundary integral simulations in the Stokes flow limit, wherein the position of the droplet and the polarity of the end cap electrodes were assigned using physical arguments, and the center-of-mass motion was not estimated consistently invoking quasi-static conditions. In this work, we explain the experimental observation of upward breakup of charged droplets in a quadrupolar field, using numerical calculations based on the boundary element method considering inviscid droplets levitated electrodynamically using quadrupole electric fields. The center-of-mass motion and the end cap are consistently calculated in the numerical scheme. The simulations show that the gravity-induced downward shift in the equilibrium position of the drop in the trap causes significant, large-amplitude shape oscillations superimposed over the center-of-mass oscillations of the drop. An important observation here is that the shape oscillations due to the applied quadrupole fields result in sufficient deformations that act as triggers for the onset of the instability below the Rayleigh limit, thereby admitting a subcritical instability. The center-of-mass oscillations of the droplet within the trap, which follow the applied frequency, are out of phase with the applied AC signal. Thus the combined effect of shape deformations and dynamic position of the drop leads to an asymmetric breakup such that the Rayleigh fission occurs upward via the ejection of a jet at the north pole of the deformed drop. Graphical abstract
PubDate: 2022-05-13

• Correction to: A biaxial tensional model for early vertebrate
morphogenesis

Abstract: A Correction to this paper has been published: 10.1140/epje/s10189-022-00184-4
PubDate: 2022-05-12

• Thermogravitational separation in porous vertical and horizontal
cylindrical annular cells saturated by a binary mixture

Abstract: In this paper, analytical and numerical studies of species separation in vertical and horizontal porous, cylindrical annular cells were presented. The binary fluid, saturating the porous medium, is a water–ethanol mixture. The thickness e of the horizontal and vertical columns is equal to $$R_o-R_i$$ , where $$R_i$$ and $$R_o$$ are, respectively, the internal and the external radii. H is the height of the vertical cell, and the length of the horizontal cell. Constant temperatures, $$T_{\mathrm{hot}}$$ and $$T_{\mathrm{cold}}$$ , were imposed on the inner and outer cylinders. Since an important species separation, in thermogravitational column (TGC), is obtained for $$e<<H$$ , the same assumption was made for the two configurations. The analytical solution was obtained using the parallel flow approximation for both configurations. The governing equations were solved numerically for 2D and 3D configurations using two different software (Comsol Multiphysics and a spectral collocation method with Gauss–Lobatto–Chebyshev points). Velocity, temperature, mass fraction fields and time to reach steady state were compared for the two configurations. The amount of species separated at the top or the bottom of each cell was also compared for each configuration. Graphical abstract
PubDate: 2022-05-12

• Measuring the average cell size and width of its distribution in cellular
tissues using Fourier transform

Abstract: We present an in-depth investigation of a fully automated Fourier-based analysis to determine the cell size and the width of its distribution in 3D biological tissues. The results are thoroughly tested using generated images, and we offer valuable criteria for image acquisition settings to optimize accuracy. We demonstrate that the most important parameter is the number of cells in the field of view, and we show that accurate measurements can already be made on volume only containing $$3\times 3\times 3$$ cells. The resolution in z is also not so important, and a reduced number of in-depth images, of order of one per cell, already provides a measure of the mean cell size with less than 5% error. The technique thus appears to be a very promising tool for very fast live local volume cell measurement in 3D tissues in vivo while strongly limiting photobleaching and phototoxicity issues. Graphic abstract
PubDate: 2022-05-09

• Effect of an excess of surfactant on thermophoresis, mass diffusion and
viscosity in an oily surfactant-stabilized ferrofluid

Abstract: The effect of an excess of surfactant on the thermophoresis of a sterically stabilized ferrofluid is investigated experimentally by forced Rayleigh scattering (FRS). The experiments are performed with a stable magnetic fluid sample to which controlled amounts of surfactant are added. A decrease in the thermally induced transport of magnetic nanoparticles is observed while increasing the temperature T. The positive Soret coefficient $$S_{\mathrm{T}}$$ decreases by adding 2 vol% of surfactant at room temperature. As shown by FRS relaxation, this decreasing is mainly associated with a reduction of the interaction between the carrier fluid and individual nanoparticles. No significant effect of extra surfactant on the sign of $$S_{\mathrm{T}}$$ is observed at higher T’s (up to $$\sim \,85\,^{\circ }$$ C). Dynamic light scattering at room temperature reveals the presence of a small amount of clusters/aggregates in the samples, which are hardly detectable by FRS relaxation. The presence of these small clusters/aggregates is confirmed by a rheological probing of the fluid properties. Whatever T, a small amount of added surfactant first causes a decrease of the ferrofluid viscosity, associated with a 10% decreasing of the flow activation energy. Further on, viscosity and activation energy both recover at higher excess surfactant concentrations. These results are analyzed in terms of saturation of the surfactant layer, concentration of free surfactant chains and heat of transport of the nanoparticles. Graphic abstract
PubDate: 2022-05-05

• Predicting thermodiffusion in simple binary fluid mixtures

Abstract: The predictive capabilities of some existing theoretical models to quantify thermodiffusion have been investigated in this work. To do so, the tests have been performed on two model fluids, the hard-sphere and the Lennard-Jones (including spheres and dimers) ones, exploring different mixtures and thermodynamic conditions thanks to extensive molecular simulations. It has been confirmed that the thermal diffusion factor should be expressed as the sum of one term related to the isotope effect and one term related to the “chemical” effects and that a kinetic term is required to quantify thermodiffusion from the gas state to the liquid state. In addition, regarding the isotope effects, it has been obtained that none of the available theoretical models are able to yield a reasonable prediction relatively to the molecular simulations results and that the moment of inertia contribution is one order of magnitude smaller than the mass contribution in the liquid state. Finally, concerning the chemical effects, it has been shown the Shukla and Firoozabadi model, complemented with a kinetic term, is probably the most reasonable option to estimate the chemical contribution to the thermal diffusion factor, even if it fails in capturing the effect of the asymmetry in size and in shape between the species. Overall, this works confirms that there is still a lack of a generic model able to predict accurately thermal diffusion factors, or equivalently Soret coefficient, in simple binary mixtures from the gas state to the liquid state. Graphical abstract
PubDate: 2022-05-04

• Soret separation and thermo-osmosis in porous media

Abstract: When a temperature difference is applied over a porous medium soaked with a fluid mixture, two effects may be observed, a component separation (the Ludwig–Soret effect, thermodiffusion) and a pressure difference due to thermo-osmosis. In this work, we have studied both effects using non-equilibrium thermodynamics and molecular dynamics. We have derived expressions for the two characteristic parameters, the Soret coefficient and the thermo-osmotic coefficient in terms of phenomenological transport coefficients, and we show how they are related. Numerical values for these coefficients were obtained for a two-component fluid in a solid matrix where both fluid and solid are Lennard–Jones/spline particles. We found that both effects depend strongly on the porosity of the medium and weakly on the interactions between the fluid components and the matrix. The Soret coefficient depends strongly on whether the fluid is sampled from inside the porous medium or from bulk phases outside, which must be considered in experimental measurements using packed columns. If we use a methane/decane mixture in bulk as an example, our results for the Soret coefficient give that a temperature difference of 10 K will separate the mixture to about 49.5/50.5 and give no pressure difference. In a reservoir with 30% porosity, the separation will be 49.8/50.2, whereas the pressure difference will be about 15 bar. Thermo-osmotic pressures with this order or magnitude have been observed in frost-heave experiments. Graphic abstract
PubDate: 2022-05-03

• Nonlinearities in shadowgraphy experiments on non-equilibrium fluctuations
in polymer solutions

Abstract: Giant thermal and solutal non-equilibrium fluctuations are observed in shadowgraphy experiments on liquid mixtures subjected to a temperature gradient. For large temperature differences, both the temperature and the composition dependence of the relevant thermophysical parameters and the nonlinear terms in the diffusion equation need to be taken into account, leading to a nonlinear concentration profile. For temperature differences exceeding the inverse of the Soret coefficient, in our example approximately 10 K, the usual data evaluation yields increasingly wrong diffusion and Soret coefficients that are off by almost a factor of two for a temperature difference of 50 K. A local model that treats the measured shadowgraph signal as a superposition of the contributions from every layer of the sample is able to capture the essential trend and yields a good agreement with experimental data. The results are important for the application of shadowgraphy as a tool for the measurement of Soret and diffusion coefficients, where large temperature gradients promise a good signal-to-noise ratio. Graphical abstract
PubDate: 2022-04-26

• Hydrodynamics of electro-capillarity propelled non-Newtonian droplets
through micro-confinements

Abstract: In this article, we theoretically explore the dynamics of droplet motion and its evolution during electro-capillarity propelled actuation within microfluidic systems. The study covers a wide gamut of fluids, wherein we investigate the dynamics of both pseudoplastic and dilatant fluid droplets. It is observed that change in the fluid rheology of the non-Newtonian fluids leads to significant morphing of the droplet dynamics during the actuation and propulsion event when compared to the Newtonian counterparts. We validate the theory using experimental reports on similar systems employing Newtonian droplets. The influence of governing parameters such as the actuation voltage and its transients, dielectric layer thickness on the electrodes and electrode spacing is probed. We also explore the influence of the interfacial properties of the system, such as channel wall friction, droplet wettability, and capillary friction, and establish that the fluid rheology, in conjunction with the interfacial features regulate the electro-actuation and propulsion of the droplets. We further provide theoretical estimates on the optimal design of the electro-actuation system in terms of a proposed electro-interfacial tension parameter. The findings may hold significance towards design and development of microfluidics with electro-actuation systems. Graphical
PubDate: 2022-04-25

• Traveling waves of a colloidal suspension in a closed cell

Abstract: Two-dimensional oscillatory flows in the convective cell filled with a colloidal suspension are investigated. We consider transient and permanent evolution scenarios of the traveling wave that were found in experimental investigation (Donzelli et al. in Phys Rev Lett 102:104503, 2009). The nanoparticle transport mechanisms (thermodiffusion and gravity settling) are analyzed and elucidated with the help of finite-difference numerical simulations for Hyflon MFA colloidal suspension. The spatiotemporal characteristics of the stable (permanent) traveling waves are determined. The dependence of the Rayleigh number on the Lewis number at the boundary of existence of the stable traveling wave is obtained. Graphic abstract
PubDate: 2022-04-25

• Mass effects for thermodiffusion in dilute aqueous solutions

Abstract: Thermodiffusion is the phenomenon by which molecules in a mixture present concentration gradients in response to an imposed temperature gradient. Despite decades of investigations, this effect remains poorly understood at a molecular level. A common, phenomenological approach is to individuate the molecular factors that influence the Soret coefficient, the parameter that quantifies the resulting concentration-gradient. Experimental studies, often performed on organic mixtures, as well as simulations of model particle systems have evidenced that the difference in masses between the mixture components has an important effect on the amplitude of the Soret coefficient. Here, we use molecular dynamics simulations of a thermophoretic setting to investigate the mass dependence of the Soret coefficient in dilute aqueous solutions. An advantage of simulation approaches is that they are not limited in the range of explored molecular masses, which is often limited to isotopic substitutions in the experiments. Our simulations reveal that the mass dependence of the Soret coefficient in these solutions is in agreement with previous experimental and simulation work on molecular-size systems. In particular, it is sensitive to the relative mass difference between the solute and the solvent, but not to their absolute mass. Adjusting the mass of the solvent and of the solute can turn a thermophobic solution into a thermophilic one, where solute accumulation is reversed. This demonstrates that the mass effect can indeed compensate for the other contributions to the Soret coefficient. Finally, we find that changing the molecular moments of inertia has a much more limited impact as compared to a change in the total molecular mass. Graphical
PubDate: 2022-04-21

• Finite dimension and particle heterogeneous DLAs

Abstract: We study heterogeneous Diffusion Limited Aggregates (DLAs) i.e. those formed by a mixture, in different proportions, of 4-legged and 2-legged particles. We fixed the total number of particles, let the proportions vary, and computed their finite dimension, a recent addition to the list of “fractal” dimensions. At one extreme, when all particles are 4-legged, the corresponding DLAs are complex, fractal structures whose appearance resembles very much that of the DLAs that occur in Nature. At the other extreme, when almost all particles are 2-legged, the DLAs lose much of their complexity and acquire long rectilinear stretches so that their appearance resembles more and more the structure of the underlying lattice. We expected the complexity in between would decrease monotonically, and this would be reflected in the finite dimension of the corresponding DLAs. However, the finite dimension first increases and then, when the proportion of 4-legged to 2-legged particles is about 30 to 70, starts decreasing. In the paper, we study and explain the mechanisms behind this unexpected, counter-intuitive behaviour. Graphical abstract
PubDate: 2022-04-20

• Force-velocity relation and load-sharing in the linear polymerization
ratchet revisited: the effects of barrier diffusion

Abstract: We study the velocity-force (V-F) relation for a Brownian ratchet consisting of a linear rigid polymer growing against a diffusing barrier, acted upon by a opposing constant force (F). Using a careful mathematical analysis, we derive the V-F relations in the extreme limits of fast and slow barrier diffusion. In the first case, V depends exponentially on the load F, in agreement with the well-known formula proposed by Peskin, Odell and Oster (1993), while the relationship becomes linear in the second case. For a bundle of two filaments growing against a common barrier, equal sharing of load in the corresponding V-F relation is predicted by a mean-field argument in both limits. However, the scaling behaviour of velocity with the number of filaments is different for the two cases. In the limit of large D, the validity of the mean-field approach is tested, and partially supported by a detailed and rigorous analysis. Our principal predictions are also verified in numerical simulations. Graphic abstract
PubDate: 2022-04-13

• Correction to: Efficient event-driven simulations of hard spheres

PubDate: 2022-04-11

• Inter-nucleosomal potentials from nucleosomal positioning data

Abstract: Abstract No systematic method exists to derive inter-nucleosomal potentials between nucleosomes along a chromosome consistently across a given genome. Such potentials can yield information on nucleosomal ordering, thermal as well as mechanical properties of chromosomes. Thus, indirectly, they shed light on a possible mechanical genomic code along a chromosome. To develop a method yielding effective inter-nucleosomal potentials between nucleosomes, a generalized Lennard-Jones potential for the parameterization is developed based on nucleosomal positioning data. This approach eliminates some of the problems that the underlying nucleosomal positioning data have, rendering the extraction difficult on the individual nucleosomal level. Furthermore, patterns on which to base a classification along a chromosome appear on larger domains, such as hetero- and euchromatin. An intuitive selection strategy for the noisy optimization problem is employed to derive effective exponents for the generalized potential. The method is tested on the Candida albicans genome. Applying k-means clustering based on potential parameters and thermodynamic compressibilities, a genome-wide clustering of nucleosome sequences is obtained for C. albicans. This clustering shows that a chromosome beyond the classical dichotomic categories of hetero- and euchromatin is more feature-rich.
PubDate: 2022-04-11

• A physical mechanism underlying the torque generation of the bacterial
flagellar motor

Abstract: This study proposes a physical mechanism underlying the torque generation of a bacterial flagellar motor (BFM), in which the torque for the rotation of the rotor can be generated from impulsive forces resulting from collisions between the randomly moving stator and rotor. The torque required for the rotation of the rotor may be generated through two coexisting mechanisms: mechanism (A), in which the stator collides with the rotor, whose rotation axis fluctuates asymmetrically, generating a torque in the direction of the rod, and mechanism (B), in which physical collisions between the stator and the asymmetric $$\hbox {FliG}_{{\mathrm{N}}\, }$$ and $$\hbox {FliG}_{{\mathrm{M}}}$$ generate the torque in the direction of the rod. Mechanism (A) might be related the bidirectional rotation and the tumbling of the motion of the cell. Mechanism (B) might be related to occurrence of the steps in the time traces of the rotational angle, backward stepping or switching of the rotational direction, and the knee-shaped $$\uptau _{{\mathrm{ext}}}$$ – $$\upomega$$ relation. The above-mentioned characteristics of the rotation of BFM are reproduced in a model device designed to confirm the applicability of the proposed concept to real BFM. Moreover, a prediction of the disappearance of the knee-shaped $$\uptau _{\mathrm{ext}}$$ – $$\upomega$$ relation of the actual BFM at a high temperature is proposed. Graphic abstract
PubDate: 2022-04-11

• A biaxial tensional model for early vertebrate morphogenesis

Abstract: We propose a simple biaxial tensional model which is able to reproduce at a qualitative level several aspects of early stages of vertebrate morphogenesis. The model is based on subsequent excitable contractions of an orthoradial and periclinal (radial) set of contracting lines, which generate first the basic embryonic pattern (a motile tube), and second the lateral orifices such as ears, eyes, mouth, gills, etc. An important aspect of the model is the self-arresting character of the process, akin to wound healing. At later stages, the biaxial lines may also work in extension, and this generates a developmental feedback which is quadratic with respect to curvature. Graphic abstract
PubDate: 2022-04-08

• Spontaneous flow created by active topological defects

Abstract: Topological defects are at the root of the large-scale organization of liquid crystals. In two-dimensional active nematics, two classes of topological defects of charges $$\pm 1/2$$ are known to play a major role due to active stresses. Despite this importance, few analytical results have been obtained on the flow-field and active-stress patterns around active topological defects. Using the generic hydrodynamic theory of active systems, we investigate the flow and stress patterns around these topological defects in unbounded, two-dimensional active nematics. Under generic assumptions, we derive analytically the spontaneous velocity and stall force of self-advected defects in the presence of both shear and rotational viscosities. Applying our formalism to the dynamics of monolayers of elongated cells at confluence, we show that the non-conservation of cell number generically increases the self-advection velocity and could provide an explanation for their observed role in cellular extrusion and multilayering. We finally investigate numerically the influence of the Ericksen stress. Our work paves the way to a generic study of the role of topological defects in active nematics, and in particular in monolayers of elongated cells. Graphical abstract
PubDate: 2022-04-07

• Effect of varying load in moving period of a step on dynamics of molecular
motors

PubDate: 2022-03-23

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