Diffusiophoresis at the macroscale

Self-Diffusiophoresis of Janus Particles in Near-Critical Mixtures.

We theoretically study the self-propulsion of a laser-heated Janus particle in a near-critical water-lutidine mixture, and we relate its velocity v_{p} and squirmer parameter β to the wetting properties of its two hemispheres. For nonionic surface forces, the particle moves the active cap at the front, whereas a charged hydrophilic cap leads to backward motion, in agreement with the experiment....

Metric-Resolution 2D River Modeling at the Macroscale: Computational Methods and Applications in a Braided River

Metric resolution digital terrain models (DTMs) of rivers now make it possible for multi-dimensional fluid mechanics models to be applied to characterize flow at fine scales that are relevant to studies of river hydraulic geometry (HG) and ecological habitat, or microscales. These developments are important for managing rivers because of the potential to better understand system dynamics, anthr...

Simulating macroscale brain circuits with microscale resolution

Macroscale Transformation Optics Enabled by Photoelectrochemical Etching.

Photoelectrochemical etching of silicon can be used to form lateral refractive index gradients for transformation optical devices. This technique allows the fabrication of macroscale devices with large refractive index gradients. Patterned porous layers can also be lifted from the substrate and transferred to other materials, creating more possibilities for novel devices.

Patch Dynamics for Multiscale Problems Bridging the Macroscale and Microscale

There are important systems—those that couple molecular dynamics with a material’s macroscale behavior or use a Boltzmann particle model to predict large-scale patterns in a fluid flow, for example—that must be modeled on relatively long time or space scales, but the dynamics can be advanced only on short time or space scales. First developed by Yannis Kevrekidis and his collaborators,1–5 patch...