20 papers · ranked by Valyu relevance
Mayumi Hamada, Pietro de Anna
Molecular diffusion in liquids is a key process in numerous systems: it is often the reaction rate limiting factor in biological or chemical reaction. Molecular diffusion has been recognized as the ultimate mechanism by which substances concentration get homogenized and, thus, their mixing and dilution occur. Here, we…
Gregory L. Eyink, Amir Homayoun Jafari
We discuss application of methods from the Kraichnan model of turbulent advection to the study of non-equilibrium concentration fluctuations arising during diffusion in liquid mixtures at high Schmidt numbers. This approach treats nonlinear advection of concentration fluctuations exactly, without linearization.…
Denis S. Grebenkov
We employ a general spectral approach based on the Steklov eigenbasis to describe imperfect diffusion-controlled reactions on bounded reactive targets in three dimensions. The steady-state concentration and the total diffusive flux onto the target are expressed in terms of the eigenvalues and eigenfunctions of the…
Christophe Tournassat, Carl I. Steefel, Patricia M. Fox, Ruth M. Tinnacher
'Ruth M. Tinnacher'] The reactive transport code CrunchClay was used to derive effective diffusion coefficients (D*e), clay porosities (ε), and adsorption distribution coefficients (K**D) from through-diffusion data while considering accurately the influence of unavoidable experimental biases on the estimation of these…
Marco Di Mambro, Paolo De Los Rios
Biomolecular condensates are thought to play a pivotal role in cellular organization by regulating biochemical reactants in space and time. Sustained molecular fluxes across condensate boundaries, together with the participation of phase-separating molecules in active chemical reactions such as ATP hydrolysis, call for…
Christopher J. Howland, Roberto Verzicco, Detlef Lohse
Motivated by the ablation of vertical ice faces in salt water, we use three-dimensional direct numerical simulations to investigate the heat and salt fluxes in two-scalar vertical convection. For parameters relevant to ice-ocean interfaces in the convection-dominated regime, we observe that the salinity field drives…
Charles Antoine, J. Talbot
Despite having been studied for decades, first passage processes remain an active area of research. In this contribution we examine a particle diffusing in an annulus with an inner absorbing boundary and an outer reflective boundary. We obtain analytic expressions for the joint distribution of the hitting time and the…
Authors not listed
Predicting how often molecules collide in dilute solution remains a long-standing challenge often with several orders of magnitude difference between theoretical values and experimental values also among different experimental values. Traditional frameworks from Smoluchowski and Langmuir rely on the formation of stable…
Jixin Chen
Predicting the reaction kinetics, that is, how fast a reaction can happen in a solution, is essential information for many processes, such as industrial chemical manufacturing, refining, synthesis and separation of petroleum products, environmental processes in air and water, biological reactions in cells, biosensing…
Jessica Venetz, Olga M. Żygadłowska, Nicky Dotsios, Anna J. Wallenius + 6 more
In the water column of coastal waters, methane-oxidizing bacteria (MOB) can form a methane biofilter. This filter can counteract high benthic methane fluxes and thereby lower methane emissions to the atmosphere. Recent metagenomic studies revealed that the metabolism of the MOB in the filter is versatile, and could…
Achuthan Raja Venkatesh, Kathy H. Le, David M. Weld, Onn Brandman
While inhomogeneous viscosity has been identified as a ubiquitous feature of the cellular interior, its implications for particle mobility and concentration at different length scales have remained unexplored. In this work, we use agent-based simulations of diffusion to investigate how diverse manifestations of…
Jixin Chen
Diffusive adsorption/association is a fundamental step in almost all chemical reactions in diluted solutions, such as organic synthesis, polymerization, self-assembly, biomolecular interactions, electrode dynamics, catalysis, chromatography, air and water environmental dynamics, and social and market dynamics. However…
Hoang-Thanh Nguyen, Anne Bouchaudy, Jean‐Baptiste Salmon
We have developed a microfluidic tool to measure the diffusion coefficient D of solutes in an aqueous solution, by following the temporal relaxation of an initially steep concentration gradient in a microchannel. Our chip exploits multilayer soft lithography and the opening of a pneumatic microvalve to trigger the…
Achuthan Raja Venkatesh, Kathy H Le, David M Weld, Onn Brandman + 2 more
'Pierre Sens' 'Aleksandra M Walczak'] While inhomogeneous diffusivity has been identified as a ubiquitous feature of the cellular interior, its implications for particle mobility and concentration at different length scales remain largely unexplored. In this work, we use agent-based simulations of diffusion to…
Olivier Destrian, Nicolas Moisan, René-Marc Mege, Benoit Ladoux + 2 more
Intracellular transport of macromolecules is crucial for the proper functioning of most cellular processes. Although intracellular crowding is known to strongly alter macromolecule mobility, how cytoplasmic structures physically modulate diffusion remains largely unexplored. Here we investigated the mechanisms by which…
Felix J. Meigel, Thomas Darwent, Leonie Bastin, Lucas Goehring + 1 more
'Karen Alim'] Understanding and controlling transport through complex media is central for a plethora of processes ranging from technical to biological applications. Yet, the effect of micro-scale manipulations on macroscopic transport dynamics still poses conceptual conundrums. Here, we demonstrate the predictive…
Srijana Pandey, Dinesh Gautam, Jixin Chen
Many interactions between small molecules and particles occur in solutions. They are surrounded by other molecules that do not react, for example, biological processes in water, chemical reactions in gas or liquid solutions, and environmental reactions in air and water. Predicting the rate of such interactions involves…
Steven J. Moran, Ryan Oglietti, Kathleen C. Smith, Jed C. Macosko + 2 more
Viral and cellular particles too large to freely diffuse have two different types of mobility in the eukaryotic cell cytoplasm: directed motion mediated by motor proteins moving along cytoskeletal elements with the particle as its load, and motion in random directions mediated by motor proteins interconnecting…
Jixin Chen
Predicting the reaction kinetics, that is, how fast a reaction can happen in a solution, is essential information for many processes, such as industrial chemical manufacturing, refining, synthesis and separation of petroleum products, environmental processes in air and water, biological reactions in cells, biosensing…
Jixin Chen
Predicting the reaction kinetics, that is, how fast a reaction can happen in a solution, is essential information for many processes, such as industrial chemical manufacturing, refining, synthesis and separation of petroleum products, environmental processes in air and water, biological reactions in cells, biosensing…