Article
Chemistry, Physical
Lili Zeng, Walter W. Reisner
Summary: This study investigates the non-equilibrium physics of two nanochannel-confined semiflexible polymers using molecular dynamics simulation. The results reveal that the internal organization of the polymers can lead to mixing or demixing depending on chain stiffness and flow speed.
EUROPEAN PHYSICAL JOURNAL E
(2023)
Article
Chemistry, Physical
Hong Gong, Yao Wang, Xiao Zheng, Rui-Xue Xu, YiJing Yan
Summary: In this work, we develop a method based on the dissipaton-equation-of-motion theory to evaluate the work distributions in quantum impurity system-bath mixing processes with non-Markovian and strong couplings. Our results accurately reproduce the Jarzynski equality and Crooks relation and provide rich information on large deviation.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Davide Venturelli, Andrea Gambassi
Summary: We investigate the nonequilibrium dynamics of two particles coupled to a thermally fluctuating scalar field and confined in separate harmonic potentials. When one of these particles is subjected to an external periodic driving, their motion synchronizes due to the field-mediated effective interaction, leading to a nonequilibrium periodic state. We analyze the nonlinear response of the second particle as a function of the driving frequency, particularly far from the adiabatic regime, and compare the perturbative, analytic solution to its adiabatic approximation, validating our predictions through numerical simulations.
Article
Chemistry, Physical
D. Truzzolillo
Summary: Motivated by observations of the heterogeneous domain structure on the surface of cells and vesicles, this study considers a minimal quasi-2D model to describe the structure of binary mixtures on the surface of a spherical particle. The effect of miscibility and adsorbing particle addition on the mixture structure is studied, and a new scalar quantity called the geodesic mixing parameter is defined to analyze the role of miscibility and preferential affinity of adsorbing particles. The study also examines the distribution of void sizes and identifies the factors controlling the transition from exponentially tailed to fat-tailed distributions.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
S. L. Fussell, C. P. Royall, J. S. van Duijneveldt
Summary: In this study, the temperature-dependent phase behavior of mixtures of pNIPAM microgel colloids and PEO-PPO-PEO surfactant was investigated. The role of heating rate in the aggregation mechanism was found to change from depletion-driven at low temperatures to association-driven at high temperatures. The heating-rate-dependent response of the system allowed for the exploration of multiple structures for the same system composition.
Article
Physics, Fluids & Plasmas
Hideki Kobayashi, Paul B. Rohrbach, Robert Scheichl, Nigel B. Wilding, Robert L. Jack
Summary: The study used a two-level simulation method to analyze the critical point associated with demixing of binary hard sphere mixtures. The results showed a strong and unexpected dependence of the critical point on the size ratio between large and small particles, which is related to three-body effective interactions and the geometry of the underlying hard-sphere packings.
Article
Physics, Fluids & Plasmas
A. Cavagna, P. M. Chaikin, D. Levine, S. Martiniani, A. Puglisi, M. Viale
Summary: Collective behavior displays a rich combination of different kinds of order, making it difficult to define phases clearly. Compression-based entropies, such as computable information density, have proven useful in describing different phases of out-of-equilibrium systems. These entropies can be effective tools in distinguishing various noise regimes and transitions between different phases, even when certain parameters are not explicitly used.
Review
Chemistry, Multidisciplinary
Keiko Nishikawa
Summary: This paper introduces the method of density fluctuation and concentration fluctuation to describe solution structures, emphasizing the fluctuations of solutions in the mesoscale region. The relationship with solution thermodynamics is discussed, and the features of experiments to measure fluctuations are described.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2021)
Article
Mechanics
Alen Pavlic, Cooper Lars Harshbarger, Luca Rosenthaler, Jess Gerrit Snedeker, Juerg Dual
Summary: This study presents a technique utilizing acoustically excited sharp edges to generate strong mixing flow in a microfluidic chip. The chip is capable of precise manipulation of fluids and objects on the microscale, making it crucial for various applications in life sciences and chemical engineering.
Article
Multidisciplinary Sciences
Ikjong Park, Han Sang Park, Hong Kyun Kim, Wan Kyun Chung, Keehoon Kim
Summary: The study found that increasing needle insertion speed can lead to a rise in intraocular pressure at the moment of penetration, but this effect is reduced as needle size decreases. Injection speed is also related to intraocular pressure elevation during the drug injection stage.
Article
Chemistry, Physical
Weifeng Lin, Nir Kampf, Jacob Klein
Summary: This study investigates the difference in surface lubricity between neutral lipid-PMPC conjugates and negatively charged lipid/polyphosphocholine conjugate modified liposomes. The results show that neutral polyphosphocholinated liposomes exhibit superlubricity, while negatively charged lipid/polyphosphocholine conjugate modified liposomes are unable to adsorb on negatively charged surfaces.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Physics, Multidisciplinary
Weicheng Ye, Sung-Sik Lee, Liujun Zou
Summary: The study reveals that through UV-IR mixing, higher-loop processes can enhance coupling at low energies, shrinking the basin of attraction for the weakly coupled fixed point of a (2+1)dimensional MFL to a measure-zero set in the low-energy limit. This effect is caused by gapless virtual Cooper pairs that spread over the entire FS through marginal long-range interactions, signaling a breakdown of the patch description for the MFL and questioning the validity of using the MFL as the base theory in a controlled scheme for non-Fermi liquids arising from relevant long-range interactions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Thermodynamics
Zezhao Nan, Xianqiao Zhao, Yaru Li, Keyuan Zhang, Naihua Wang
Summary: This study investigates mixing characteristics and temperature fluctuations in T-junctions of 90 degrees and 45 degrees using visualization experiments and Large Eddy Simulations. The branch flow incidence of 45 degrees makes the mixing uniformity worse, with shear layer vortices playing a key role in controlling the dominant frequency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Marine
Changliang Ye, Yuan Tang, Dongsen An, Fujun Wang, Yuan Zheng, B. P. M. van Esch
Summary: This study establishes a calculation strategy that considers the transition effect of centrifugal pump stall and reveals the relationship between the calculated microscopic flow structure and the pump head characteristics. The dynamic mode decomposition method is used to extract characteristic frequencies and modes of the stall flow field with transition. These findings can provide guidance for centrifugal pump design and operation.
Article
Multidisciplinary Sciences
Hye Min Seo, Seulwoo Kim, Sangwoo Kwon, YongJoo Kim, Minchul Sung, Jongryeol Yang, Boryeong Lee, Jongbaek Sung, Min -Ho Kang, Jungwon Park, Kyounghee Shin, Won Bo Lee, Jin Woong Kim
Summary: A smart polymer laminate film system with direction-controlled phase separation behavior was developed in this study, where liquid nanodrops were uniformly confined in a polymer laminate film through the layer-by-layer deposition of oppositely charged emulsion nanodrops and polyelectrolytes.
Article
Mechanics
David S. Dean, Paul Gersberg, Peter C. W. Holdsworth
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2020)
Article
Chemistry, Physical
M. Mangeat, T. Guerin, D. S. Dean
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Physics, Multidisciplinary
David S. Dean, Bing Miao, Rudolf Podgornik
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2020)
Article
Physics, Multidisciplinary
David S. Dean, Pierre Le Doussal, Satya N. Majumdar, Gregory Schehr, Naftali R. Smith
Summary: The study presents a general method for computing the quantum correlations of N non interacting spinless fermions in their ground state, expressed in terms of a two-point function called the kernel. The method allows for a simple derivation of the local density approximation and the sine kernel in smooth potentials in one dimension, and recovers the density and kernel of the Airy gas at the edge of the trap. Additionally, the method can analyze quantum correlations in the ground state when the potential has a singular part with fast spatial variation.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Physics, Multidisciplinary
David S. Dean, Pierre Le Doussal, Satya N. Majumdar, Gregory Schehr
Summary: The study focuses on the properties of spin-less non-interacting fermions trapped in a one-dimensional confining potential with one or more impurities modeled by delta function potentials. The method based on the single particle Green's function is employed to calculate the effects of impurities on the Fermi gas density and the effective potential. Results show interesting transitions and modifications in the density and potential when impurities are placed at different locations, such as near the edge of the trap or in the bulk.
Article
Mechanics
A. Alexandre, T. Guerin, D. S. Dean
Summary: The study focuses on Taylor dispersion of tracer particles in microfluidic channels with strong confinement, highlighting the influence of channel walls on diffusivity and interactions with the tracer particles. A simple and general formula is provided for calculating the effective diffusion constant along the channel and the first non-trivial finite time correction, applicable to various flow conditions, interaction potentials, and diffusion tensors. The formulas are particularly useful for numerical implementation and comparison with experiments.
Article
Mechanics
Matthieu Mangeat, Thomas Guerin, David S. Dean
Summary: This paper presents an exact solution for the steady state statistics of overdamped Brownian particles in an optical trap subjected to a non-conservative scattering force. The results include certain marginals of the full three-dimensional steady state probability distribution and toroidal probability currents. The analytical results are confirmed by numerical solutions of the steady state Fokker-Planck equation.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Physics, Multidisciplinary
A. Alexandre, M. Mangeat, T. Guerin, D. S. Dean
Summary: Using a general adsorption desorption model with surface diffusion, this study analytically shows that making surfaces or obstacles attractive can accelerate dispersion.
PHYSICAL REVIEW LETTERS
(2022)
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
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
Mechanics
David S. Dean, Satya N. Majumdar, Gregory Schehr
Summary: This paper investigates the problem of leakage or effusion of an ensemble of independent stochastic processes from a region where they are initially randomly distributed. The case of Brownian motion, initially confined to the left half line with uniform density and leaking into the positive half line, has been extensively studied. The authors derive new results for the average number and variance of the number of leaked particles for arbitrary Gaussian processes initially confined to the negative half line, and also derive its joint two-time probability distribution, both for the annealed and the quenched initial conditions. They show that the strong memory effects in the variance of the particle number on the positive real axis for Brownian particles persist for arbitrary Gaussian processes and also at the level of two-time correlation functions.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2023)
Article
Optics
Benjamin De Bruyne, David S. Dean, Pierre Le Doussal, Satya N. Majumdar, Gregory Schehr
Summary: This study investigates the structure of the Wigner function in the quantum region, particularly focusing on the edge of the Fermi surface, identifying three distinct edge regions and their scaling functions. Additionally, a striking algebraic tail is found for very large momenta, well beyond the Fermi momentum, reminiscent of a similar phenomenon in interacting quantum systems. These results are then extended to higher dimensions, revealing a universal scaling function near the edge of the box, independent of the dimension.
Article
Physics, Fluids & Plasmas
David S. Dean, Satya N. Majumdar, Hendrik Schawe
Summary: A class of stochastic processes is studied in which the behavior changes with different values of n, with a localization transition occurring at n = 1/2. The position distribution exhibits different characteristics for different n values, with a transition to a stationary form for n < 1/2.
Article
Optics
Naftali R. Smith, David S. Dean, Pierre Le Doussal, Satya N. Majumdar, Gregory Schehr
Article
Physics, Multidisciplinary
David S. Dean, Pierre Le Doussal, Satya N. Majumdar, Gregory Schehr
