Surface coverage is an important parameter in describing the kinetics of adsorption interface science, theory macromolecules (e.g., proteins, DNA) on biomaterial surface, stability colloids...

Abstract A stainless steel template for the fabrication of plastic microfluidic devices has been developed by photolithography and chemical etching technique. The preparation process is simple, rapid, low‐cost. cross sectional profiles raised microchannels on are trapezoidal. surface roughness templates was controlled down to 190 nm. can be used repeatedly generate reproducibly. poly(methyl methacrylate) (PMMA) were fabricated in situ polymerization using templates. reproducibility...

A mean-field model is developed to predict the layer-thickness of sparse and salt-free polyelectrolyte brushes, exposed an external electric field, which attracts polyelectrolytes substrate. In molecular dynamics simulations, it shown that a fraction polymers collapses entirely screen charge The remaining brushes are then treated as field-free at reduced grafting density. may thus be applied both in their osmotic weak regimes. It yields simple, closed equations for brush height partition...

Using molecular dynamics simulations and scaling theory, we present a systematic study of the function cylindrical nanopores which are decorated with polymer brushes. Our focus is on regimes in these systems able to as switchable gates for bulky nanoparticles. The process switching triggered through addition smaller component solvent, acts co-nonsolvent, causing discontinuous collapse brush opening central passway nanopore. We quantify conditions under agents different diameters allowed pass...

The solvophobicity-driven directional self-assembly of polymer-coated gold nanorods is a well-established phenomenon. Yet, the kinetics this process, origin site-selectivity in self-assembly, and interplay (attractive) solvophobic brush interactions (repulsive) electrostatic forces are not fully understood. Herein, we use combination time-resolved (vis/NIR) extinction spectroscopy finite-difference time-domain (FDTD) simulations to determine conversion profiles for assembly with polystyrene...

We analyze the mean-field theory of polymer brushes inside cylindrical channels to predict properties collapse transitions brush, related with an opening channel, upon changes solvent quality. The interplay compressibility brush under poor conditions and surface tension due a central void in channel lead discontinuous phase transition, which is characterized by bi-stable free energy landscape. Our model can be extended describe copolymer modified end-groups. different solubility two monomer...

We consider polymer brushes in poor solvent that are grafted onto planar substrates and the internal external surfaces of a cylinder using molecular dynamics simulation, self-consistent field (SCF), mean-field theory. derive unified expression for mean free energy three geometrical classes. While low grafting densities, effect chain elasticity can be neglected conditions, it becomes relevant at higher densities and, particular, concave geometries. Based on analysis end monomer distribution,...

Wind energy is known as one of the most efficient clean renewable sources and has attracted extensive research interests in both academic industry fields. In this study, effects turbulent wind voltage disturbance on a turbine drivetrain are analyzed, dynamic model combined with electric doubly fed induction generator established. The proposed able to account for interaction between wind, disturbance, mechanical system. Also, time-varying meshing stiffness, transmission error, bearing...

With the assistance of molecular dynamics simulations, we investigate nanoparticles (NPs) that are driven through a polymer brush-decorated cylindrical channel in marginally poor solvent. The NPs tend to form clusters due repulsive interaction with respect brush. Depending on number within and driving force, either individually propagating droplets or continuous flow state is obtained. We derive approximate scaling relations between volume NP cluster particles both states as well relation...

Nanoparticles (NPs) that are forcefully driven through a brush-decorated nanochannel form nonequilibrium system with rich physical behavior, including dynamical phase transition between two modes of propagation correspond to either separate clusters NPs or continuous flow channel. The peculiar properties this make it an ideal benchmark candidate for comparison three thermostat settings, the dissipative particle dynamics (DPD), Langevin (LGV) dynamics, and modified LGV setup, denoted as...

A novel array-pattern ring microfluidic chip has been designed and fabricated with ITO glass, a low-cost, easy-to-use active magnetic mixer is developed. The consists of externally driven stir plates ferromagnetic microneedles as mobile stirrers in the microchannel. Mixing performance experimentally characterized by chemiluminescence immunoassay human thyrotropin (TSH) compared tube-based immunoassay. mixing method proposed this study can be readily applied to integrated systems, such...

During the ultra-precision grinding of a large aperture mirror made RB-SiC, wheel becomes dull rapidly, which will lead to an increase force and decrease ratio. In this paper, diamond sticks were dressed with micro SiC abrasive water jet jet. Through single factorial experiments, influence pressure on dressing performance was investigated. To analyze evaluate effect quantitatively, 3D roughness topography measured compared laser scanning confocal microscope before after dressing. The...

In molecular dynamics simulations we investigate the self-organized formation of droplets from a continuous flow incoming nanoparticles. This transformation is facilitated by cylindrical channel that decorated with polymer brush in marginally poor solvent. We analyze droplet and propagation means simple scaling arguments which are tested simulations. Polymer brushes solvents serve as pressure feedback system, exhibit collapse transition under moderate incident flow, without need for...