scholarly journals Single-file and normal diffusion of magnetic colloids in modulated channels

2014 ◽  
Vol 89 (3) ◽  
Author(s):  
D. Lucena ◽  
J. E. Galván-Moya ◽  
W. P. Ferreira ◽  
F. M. Peeters
Keyword(s):  
Single File ◽  
Normal Diffusion ◽  
Magnetic Colloids

Displacement correlation as an indicator of collective motion in one-dimensional and quasi-one-dimensional systems of repulsive Brownian particles

2015 ◽  
Vol 29 (34) ◽  
pp. 1550221 ◽  
Author(s):  
Takeshi Ooshida ◽  
Susumu Goto ◽  
Takeshi Matsumoto ◽  
Michio Otsuki
Keyword(s):  
Collective Motion ◽  
Static Structure Factor ◽  
Static Structure ◽  
One Dimensional ◽  
Point Space ◽  
Single File ◽  
Brownian Particles ◽  
Time Correlations ◽  
Collective Motions ◽  
Normal Diffusion

While the slow dynamics in glassy liquids are known to be accompanied by collective motions undetectable with static structure factor and requiring four-point space-time correlations for their detection, it is usually difficult to calculate such correlations analytically. In the present study, a system of Brownian particles in a (quasi-)one-dimensional passageway is taken as an example to demonstrate the usefulness of displacement correlation. In the purely one-dimensional case (known as the single-file diffusion) with overtaking forbidden, the diffusion slows down and collective motion is captured by displacement correlation both calculated here numerically and analytically. On the other hand, displacement correlation vanishes if overtaking is allowed, which leads to normal diffusion.

scholarly journals Diffusive properties of colloidal charged particles in a quasi-one-dimensional confinement

2021 ◽  
Vol 10 (12) ◽  
pp. e403101220595
Author(s):  
Levi Rodrigues Leite ◽  
Jorge Luiz Bezerra de Araújo ◽  
Leandro Jader Pitombeira Xavier ◽  
Vagner Henrique Loiola Bessa ◽  
João Cláudio Nunes Carvalho ◽  
...  
Keyword(s):  
Interaction Potential ◽  
Dimensionless Parameter ◽  
Charged Particles ◽  
Mean Square Displacement ◽  
Colloidal Crystals ◽  
One Dimensional ◽  
Single File ◽  
Normal Diffusion ◽  
Small Clusters ◽  
Diffusive Behaviour

Diffusive properties of colloidal crystals in a quasi-one-dimensional channel are studied using numerical simulations. In order to study the influence of the attractive interaction between particles, it was introduced as an artificial dimensionless parameter β in the attractive term of the interaction potential. Changing the value of β, we can tune the effect of attraction between particles. We show that charged particles can change their mobility and the diffusion exponent of a one-chain like system. Variation on exponent diffusion can be induced by tuning the attractive part of interaction potential, making possible the existence of diffusive regimes between single-file diffusion (SFD) and normal diffusion, without changing confinement strength. System stoichiometry was changed, imposing particles in different arrangements in small clusters, which varies the diffusive behaviour. If stoichiometry is different from 1:1, it is possible to have particles with equal charges but with different mobilities. Another important observation is that mean-square displacement (MSD) for different charges is different for different values.

One-dimensional Gaussian-core fluid: ordering and crossover from normal diffusion to single-file dynamics

Soft Matter ◽  
2016 ◽  
Vol 12 (44) ◽  
pp. 9047-9057 ◽  
Author(s):  
Salvador Herrera-Velarde ◽  
Gabriel Pérez-Angel ◽  
Ramón Castañeda-Priego
Keyword(s):  
One Dimensional ◽  
Single File ◽  
Normal Diffusion

Relationship between single-file diffusion of mixed and pure gases in dipeptide nanochannels by high field diffusion NMR

2015 ◽  
Vol 51 (69) ◽  
pp. 13346-13349 ◽  
Author(s):  
Akshita R. Dutta ◽  
Poorvajan Sekar ◽  
Muslim Dvoyashkin ◽  
Clifford R. Bowers ◽  
Kirk J. Ziegler ◽  
...  
Keyword(s):  
High Field ◽  
Diffusion Nmr ◽  
Single File ◽  
Field Diffusion ◽  
Normal Diffusion ◽  
Diffusion Rates ◽  
First Time ◽  
The Relationship ◽  
Single File Diffusion

Under single-file confinement, the relationship between diffusion rates of mixed and pure gases is studied experimentally for the first time and observed to differ from that for normal diffusion.

Enhanced flow in smooth single-file channel

2007 ◽  
Vol 127 (5) ◽  
pp. 054706 ◽  
Author(s):  
Shashwati Roy Majumder ◽  
Niharendu Choudhury ◽  
Swapan K. Ghosh
Keyword(s):  
Single File

scholarly journals Single-File Water Flux Through Two-Dimensional Nanoporous Membranes

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Myung Eun Suk
Keyword(s):  
Water Flux ◽  
Interaction Strength ◽  
High Water ◽  
Potential Of Mean Force ◽  
Proximal Region ◽  
Dominant Factor ◽  
Chemical Characteristics ◽  
Nanoporous Membranes ◽  
Two Dimensional ◽  
Single File

Abstract Recent advances in the development of two-dimensional (2D) materials have facilitated a wide variety of surface chemical characteristics obtained by composing atomic species, pore functionalization, etc. The present study focused on how chemical characteristics such as hydrophilicity affects the water transport rate in hexagonal 2D membranes. The membrane–water interaction strength was tuned to change the hydrophilicity, and the sub-nanometer pore was used to investigate single-file flux, which is known to retain excellent salt rejection. Due to the dewetting behavior of the hydrophobic pore, the water flux was zero or nominal below the threshold interaction strength. Above the threshold interaction strength, water flux decreased with an increase in interaction strength. From the potential of mean force analysis and diffusion coefficient calculations, the proximal region of the pore entrance was found to be the dominant factor degrading water flux at the highly hydrophilic pore. Furthermore, the superiority of 2D membranes over 3D membranes appeared to depend on the interaction strength. The present findings will have implications in the design of 2D membranes to retain a high water filtration rate.

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