Colloidal transport and diffusion over a tilted periodic potential: dynamics of individual particles

Soft Matter ◽  
2015 ◽  
Vol 11 (6) ◽  
pp. 1182-1196 ◽  
Author(s):  
Xiao-guang Ma ◽  
Pik-Yin Lai ◽  
Bruce J. Ackerson ◽  
Penger Tong
Keyword(s):  
Glass Substrate ◽  
Periodic Potential ◽  
Bottom Layer ◽  
Colloidal System ◽  
Colloidal Transport ◽  
Colloidal Spheres ◽  
Transport And Diffusion ◽  
Crystalline Pattern ◽  
And Diffusion ◽  
Individual Particles

A tilted two-layer colloidal system is constructed for the study of force-assisted barrier-crossing dynamics over a periodic potential. The periodic potential is provided by the bottom layer colloidal spheres forming a fixed crystalline pattern on a glass substrate.

WEAK DISORDER IN PERIODIC POTENTIALS: ANOMALOUS TRANSPORT AND DIFFUSION

2012 ◽  
Vol 11 (01) ◽  
pp. 1240004 ◽  
Author(s):  
KATJA LINDENBERG ◽  
J. M. SANCHO ◽  
M. KHOURY ◽  
A. M. LACASTA
Keyword(s):  
Periodic Potential ◽  
Model Parameters ◽  
Weak Disorder ◽  
Periodic Potentials ◽  
Normal Diffusion ◽  
Random Components ◽  
Transport And Diffusion ◽  
And Diffusion ◽  
Deterministic Force ◽  
Pronounced Peak

Particles driven through a periodic potential by an external constant force are known to exhibit a pronounced peak of the diffusion around the critical deterministic force that defines the transition between locked and running states. It has recently been shown both experimentally and numerically that this peak is greatly enhanced if some amount of spatial disorder is superimposed on the periodic potential. Here, we show that this enhancement is a fingerprint of a broad phenomenology that goes well beyond a simple augmentation. For some values of the model parameters, including the characteristic distances associated with the periodic and random components of the potential, the magnitude of the external force, and the temperature, the system can exhibit a rich variety of regimes from normal diffusion to superdiffusion, subdiffusion and even subtransport.

scholarly journals Nocturnal Low-Level Jet in a Mountain Basin Complex. Part II: Transport and Diffusion of Tracer under Stable Conditions

2006 ◽  
Vol 45 (5) ◽  
pp. 740-753 ◽  
Author(s):  
Lisa S. Darby ◽  
K. Jerry Allwine ◽  
Robert M. Banta
Keyword(s):  
Surface Pressure ◽  
Salt Lake ◽  
Low Level ◽  
Stable Conditions ◽  
Basin Scale ◽  
Flow Features ◽  
Transport And Diffusion ◽  
Low Level Jet ◽  
The City ◽  
And Diffusion

Abstract Differences in nighttime transport and diffusion of sulfur hexafluoride (SF6) tracer in an urban complex-terrain setting (Salt Lake City, Utah) are investigated using surface and Doppler lidar wind data and large-scale surface pressure differences. Interacting scales of motion, as studied through the URBAN 2000 field program combined with the Vertical Transport and Mixing (VTMX) experiment, explained the differences in the tracer behavior during three separate intensive operating periods. With an emphasis on nighttime stable boundary layer conditions, these field programs were designed to study flow features responsible for the nighttime transport of airborne substances. This transport has implications for air quality, homeland security, and emergency response if the airborne substances are hazardous. The important flow features investigated included thermally forced canyon and slope flows and a low-level jet (LLJ) that dominated the basin-scale winds when the surface pressure gradient was weak. The presence of thermally forced flows contributed to the complexity and hindered the predictability of the tracer motion within and beyond the city. When organized thermally forced flows were present, the tracer tended to stay closer to the city for longer periods of time, even though a strong basin-scale LLJ did develop. When thermally forced flows were short lived or absent, the basin-scale low-level jet dominated the wind field and enhanced the transport of tracer material out of the city.

Pollution plume transport and diffusion studies using fluorescence lidar

1980 ◽  
Vol 19 (15) ◽  
pp. 2524 ◽  
Author(s):  
Burton G. Schuster ◽  
Thomas G. Kyle
Keyword(s):  
Diffusion Studies ◽  
Transport And Diffusion ◽  
Plume Transport ◽  
And Diffusion

Aircraft Observations of Transport and Diffusion in Cumulus Clouds

1986 ◽  
Vol 25 (12) ◽  
pp. 1959-1970 ◽  
Author(s):  
Jeffrey L. Stith ◽  
Don A. Griffith ◽  
R. Lynn Rose ◽  
John A. Flueck ◽  
James R. Miller ◽  
...  
Keyword(s):  
Cumulus Clouds ◽  
Aircraft Observations ◽  
Transport And Diffusion ◽  
And Diffusion
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