Revised Einstein–Helfand and revised Green–Kubo relations accurately predict viscosity trend with polymer length in DPD simulations.

The shear viscosity of a two-dimensional liquid-state dusty plasma was measured experimentally. A monolayer of highly charged polymer microspheres, with a Yukawa interaction, was suspended in a plasma sheath. Two counterpropagating Ar+ laser beams pushed the particles, causing shear-induced melting of the monolayer and a shear flow in a planar Couette configuration. By fitting the particle velo...

Simulations of viscoplastic materials are traditionally governed by continuum mechanics. The viscous behavior is typically modeled as an internal force, defined by diverse quantities. This work introduces a fluid model to simulate the viscoplastic effect of solid materials, such as plastic, wax, clay and polymer. Our method consists in modeling a solid object through a non-Newtonian fluid with ...

Many polymer-made objects show a trend of melting and dripping in fire, behavior that may be modified by adding flame retardants (FRs). These affect materials properties, e.g., heat absorption viscosity. In this paper, the effect retardant on fire polymers UL 94 scenario is studied. This goal achieved essentially applying new computational strategy combines particle finite element method for po...

Photophysical parameters and lasing properties of Coumarin 540A dye molecules are studied in solutions of increasing viscosity, from liquid solutions in 1,4-dioxane to solid solutions in poly~methyl methacrylate!. The fluorescence quantum yield and lasing efficiencies decrease as the viscosity of the solution increases, reflecting the strong influence of the rigidity of the medium on the radiat...

A recently developed microscope, allowing the visualization of monolayers at liquid surfaces without the addition of fluorescent molecules, is used to study molecular layers of a polymer, poly(dimethylsiloxane), on water. Coexistence of domains of different surface density is observed, both at low concentrations and at concentrations above collapse. Small isolated domains are circular ; charact...

The past decade has seen a resurgence in the study of the glass transition, particularly using computational approaches. Advances in computer architectures and algorithms have allowed the study of larger system sizes for longer time scales, which has enabled computational scientists to explore both new aspects of supercooled liquids, glasses, and the glass transition, as well as to re-investiga...

We have previously presented a microelectromechanical system (MEMS) based viscometric sensor for continuous glucose monitoring using protein Concanavalin A (Con A). To address its drawbacks, including immunotoxicity and instability issues, we have synthesized stable, biocompatible copolymers poly(acrylamide-ran-3-acrylamidophenylboronic acid) (PAA-ran-PAAPBA) for viscosity based glucose sensing...