Entropic transport in confined media: a challenge for computational studies in biological and soft-matter systems
Entropic transport in confined media: a challenge for computational studies in biological and soft-matter systems
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受限介质中的熵传输：生物和软物质系统计算研究的挑战
DOI：
10.3389/fphy.2013.00021
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发表时间：
2013
影响因子：
3.1
通讯作者：
J. Rubí
中科院分区：
文献类型：
--
作者：
P. Malgaretti;I. Pagonabarraga;J. Rubí
小规模生物和软物质系统中的传输通常发生在限制条件下，在这种条件下，粒子通过可能显著改变其轨迹的障碍物和边界不规则性。将这种限制归结为存在势垒的输运模型提供了一种有效的方法来量化势垒对粒子流和扩散系数的影响。我们回顾了熵输运的主要特征，并处理了两个限制效应起关键作用的例子，出现了突现性质。势垒的存在改变了平均首次通过时间的分布，因此在离子在微纳米通道中的输运过程中起着非常重要的作用。分子马达被建模为布朗棘轮，当马达在可能构成另一个整流源的受限介质中进行时，其功能受到强烈影响。棘轮和熵整流之间的相互作用导致了各种各样的动力学行为，当布朗马达在无界介质中前进时，这些行为是不能观察到的。熵传输为传输控制和粒子操纵提供了新的场所，并为设计更有效的纳米级传输设备提供了新的方法。
Transport in small-scale biological and soft-matter systems typically occurs under confinement conditions in which particles proceed through obstacles and irregularities of the boundaries that may significantly alter their trajectories. A transport model that assimilates the confinement to the presence of entropic barriers provides an efficient approach to quantify its effect on the particle current and the diffusion coefficient. We review the main peculiarities of entropic transport and treat two cases in which confinement effects play a crucial role, with the appearance of emergent properties. The presence of entropic barriers modifies the mean first-passage time distribution and therefore plays a very important role in ion transport through micro- and nano-channels. The functionality of molecular motors, modeled as Brownian ratchets, is strongly affected when the motor proceeds in a confined medium that may constitute another source of rectification. The interplay between ratchet and entropic rectification gives rise to a wide variety of dynamical behaviors, not observed when the Brownian motor proceeds in an unbounded medium. Entropic transport offers new venues of transport control and particle manipulation and new ways to engineer more efficient devices for transport at the nanoscale.
有死角的管中的瞬时扩散。
DOI：
10.1063/1.2805068
发表时间：
2007
期刊：
The Journal of chemical physics
影响因子：
--
作者：
Dagdug,Leonardo;Berezhkovskii,AlexanderM;Makhnovskii,YuriiA;Zitserman,VladimirYu
通讯作者：
Zitserman,VladimirYu
影响因子：
4.4
作者：
Berezhkovskii, A. M.;Pustovoit, M. A.;Bezrukov, S. M.
通讯作者：
Bezrukov, S. M.
DOI：
10.1039/c3cp53105h
发表时间：
2012-09
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
--
作者：
Jan-Frederik Pietschmann;Marie-Therese Wolfram;Martin Burger;Christina Trautmann;Gael Nguyen;M. Pevarnik;Veronika Bayer;Z. Siwy
通讯作者：
Jan-Frederik Pietschmann;Marie-Therese Wolfram;Martin Burger;Christina Trautmann;Gael Nguyen;M. Pevarnik;Veronika Bayer;Z. Siwy