scholarly journals Manipulating shear-induced non-equilibrium transitions in colloidal films by feedback control

Soft Matter ◽  
2015 ◽  
Vol 11 (2) ◽  
pp. 406-413 ◽  
Author(s):  
Tarlan A. Vezirov ◽  
Sascha Gerloff ◽  
Sabine H. L. Klapp
Keyword(s):  
Shear Stress ◽  
Feedback Control ◽  
Brownian Dynamics ◽  
Colloidal Films ◽  
Non Equilibrium

Using Brownian Dynamics (BD) simulations we investigate non-equilibrium transitions of sheared colloidal films under controlled shear stress σxz.

scholarly journals Active binary switching of soft colloids: stability and structural properties

Soft Matter ◽  
2021 ◽  
Author(s):  
Michael Bley ◽  
Joachim Dzubiella ◽  
Arturo Moncho Jorda
Keyword(s):  
Density Functional Theory ◽  
Phase Behavior ◽  
Structural Properties ◽  
Brownian Dynamics ◽  
Density Functional ◽  
Equilibrium Structure ◽  
Functional Theory ◽  
Binary Switching ◽  
Soft Colloids ◽  
Non Equilibrium

We employ reactive dynamical density functional theory (R-DDFT) and reactive Brownian dynamics (R-BD) simulations to study the non-equilibrium structure and phase behavior of an active dispersion of soft Gaussian colloids...

scholarly journals Quantification of fast molecular adhesion by fluorescence footprinting

2021 ◽  
Author(s):  
Adam B. Yasunaga ◽  
Isaac T.S. Li
Keyword(s):  
Shear Stress ◽  
Dynamic Range ◽  
Force Distribution ◽  
Equilibrium Conditions ◽  
Ligand Dissociation ◽  
Molecular Adhesion ◽  
Molecular Force ◽  
Adhesion Complex ◽  
Non Equilibrium

AbstractRolling adhesion is a unique process in which the adhesion events are short-lived and operate under highly non-equilibrium conditions. These characteristics pose a challenge in molecular force quantification, where in situ measurement of such forces cannot be achieved with most molecular force sensors that probe near equilibrium. In this report, we demonstrated a quantitative adhesion footprint assay combining DNA-based non-equilibrium force probes and modelling to measure the molecular force involved in fast rolling adhesion. We were able to directly profile the ensemble molecular force distribution during rolling adhesion with a dynamic range between 0 – 18 pN. Our results showed that the shear stress driving bead rolling motility directly controls the molecular tension on the probe-conjugated adhesion complex. Furthermore, the shear stress can steer the dissociation bias of components within the molecular force probe complex, favouring either DNA probe dissociation or receptor-ligand dissociation.

Suboptimal control of turbulent channel flow for drag reduction

1998 ◽  
Vol 358 ◽  
pp. 245-258 ◽  
Author(s):  
CHANGHOON LEE ◽  
JOHN KIM ◽  
HAECHEON CHOI
Keyword(s):  
Shear Stress ◽  
Feedback Control ◽  
Drag Reduction ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Suboptimal Control ◽  
Local Distribution ◽  
Friction Drag ◽  
Control Laws ◽  
Simple Feedback

Two simple feedback control laws for drag reduction are derived by applying a suboptimal control theory to a turbulent channel flow. These new feedback control laws require pressure or shear-stress information only at the wall, and when applied to a turbulent channel flow at Reτ=110, they result in 16–22% reduction in the skin-friction drag. More practical control laws requiring only the local distribution of the wall pressure or one component of the wall shear stress are also derived and are shown to work equally well.

Membranes under shear stress: visualization of non-equilibrium domain patterns and domain fusion in a microfluidic device

Soft Matter ◽  
2016 ◽  
Vol 12 (23) ◽  
pp. 5072-5076 ◽  
Author(s):  
Flurin Sturzenegger ◽  
Tom Robinson ◽  
David Hess ◽  
Petra S. Dittrich
Keyword(s):  
Shear Stress ◽  
Microfluidic Device ◽  
Domain Fusion ◽  
Non Equilibrium

scholarly journals Non-equilibrium chromosome looping via molecular slip-links

2016 ◽  
Author(s):  
C. A. Brackley ◽  
J. Johnson ◽  
D. Michieletto ◽  
A. N. Morozov ◽  
M. Nicodemi ◽  
...  
Keyword(s):  
Motor Activity ◽  
Osmotic Pressure ◽  
Brownian Dynamics ◽  
Ratchet Effect ◽  
Single Slip ◽  
Exactly Solvable ◽  
Set Up ◽  
Dynamics Simulations ◽  
Brownian Dynamics Simulations ◽  
Non Equilibrium

AbstractWe propose a model for the formation of chromatin loops based on the diffusive sliding of a DNA-bound factor which can dimerise to form a molecular slip-link. Our slip-links mimic the behaviour of cohesin-like molecules, which, along with the CTCF protein, stabilize loops which organize the genome. By combining 3D Brownian dynamics simulations and 1D exactly solvable non-equilibrium models, we show that diffusive sliding is sufficient to account for the strong bias in favour of convergent CTCF-mediated chromosome loops observed experimentally. Importantly, our model does not require any underlying, and energetically costly, motor activity of cohesin. We also find that the diffusive motion of multiple slip-links along chromatin may be rectified by an intriguing ratchet effect that arises if slip-links bind to the chromatin at a preferred "loading site". This emergent collective behaviour is driven by a 1D osmotic pressure which is set up near the loading point, and favours the extrusion of loops which are much larger than the ones formed by single slip-links.

scholarly journals Elasticity-based polymer sorting in active fluids: a Brownian dynamics study

2017 ◽  
Vol 19 (28) ◽  
pp. 18338-18347 ◽  
Author(s):  
Jaeoh Shin ◽  
Andrey G. Cherstvy ◽  
Won Kyu Kim ◽  
Vasily Zaburdaev
Keyword(s):  
Brownian Dynamics ◽  
Polymer Chains ◽  
Polymer Dynamics ◽  
Non Equilibrium

While the dynamics of polymer chains in equilibrium media is well understood by now, the polymer dynamics in active non-equilibrium environments can be very different.

scholarly journals Non-Equilibrium Molecular Dynamics to Simulate Shear Stress on Angiotensin II Type 1 (AT1) Receptor

2016 ◽  
Vol 110 (3) ◽  
pp. 325a
Author(s):  
Matheus Malta de Sa ◽  
Silvestre Massimo Modestia ◽  
Carlota Oliveira Rangel-Yagui ◽  
José Eduardo Krieger
Keyword(s):  
Molecular Dynamics ◽  
Shear Stress ◽  
Angiotensin Ii ◽  
At1 Receptor ◽  
Non Equilibrium Molecular Dynamics ◽  
Non Equilibrium
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