34 research outputs found
Density profiles around A+B -> C reaction-diffusion fronts in partially miscible systems:Â A general classification
Various spatial density profiles can develop in partially miscible stratifications when a phase A dissolves with a finite solubility into a host phase containing a dissolved reactant B. We investigate theoretically the impact of an A+B -> C reaction on such density profiles in the host phase and classify them in a parameter space spanned by the ratios of relative contributions to density and diffusion coefficients of the chemical species. While the density profile is either monotonically increasing or decreasing in the non reactive case, reactions combined with differential diffusivity can create eight different types of density profiles featuring up to two extrema in density, at the reaction front or below it.We use this framework to predict various possible hydrodynamic instability scenarios inducing buoyancy-driven convection around such reaction fronts when they propagate parallel to the gravity field.info:eu-repo/semantics/publishe
Dynamics due to combined buoyancy- and Marangoni-driven convective flows around autocatalytic fronts
Maze Solving Using Fatty Acid Chemistry
This
study demonstrates that the Marangoni flow in a channel network
can solve maze problems such as exploring and visualizing the shortest
path and finding all possible solutions in a parallel fashion. The
Marangoni flow is generated by the pH gradient in a maze filled with
an alkaline solution of a fatty acid by introducing a hydrogel block
soaked with an acid at the exit. The pH gradient changes the protonation
rate of fatty acid molecules, which translates into the surface tension
gradient at the liquid–air interface through the maze. Fluid
flow maintained by the surface tension gradient (Marangoni flow) can
drag water-soluble dye particles toward low pH (exit) at the liquid–air
interface. Dye particles placed at the entrance of the maze dissolve
during this motion, thus exhibiting and finding the shortest path
and all possible paths in a maze
Acoustic microscopy in the food industry
info:eu-repo/semantics/publishe