Net motion of a charged macromolecule in a ratchet-slit

Wang, Zilu; Jia, Zhe; He, Xuehao

doi:10.1039/c3sm52011k

Cited by 8 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ratchet Potential (RP) or Brownian Ratchet has been studied and investigated in several researches, its intrinsic core design characterized by Feynman Ratchets [1] , that is proposed to extract energy from random Brownian motion of gas particles [2][3][4] . The Ratchet Potential working principle is the directional transport of classical or quantum particles in systems that are dominated by random diffusion [5] .…”

Section: Introductionmentioning

confidence: 99%

Ionized Gas Thermoelectric Generator: Theoretical Evaluation and Efficiency Estimation

Bqoor¹,

Hamdan²,

Janajreh³

2021

Preprint

View full text Add to dashboard Cite

The novel Ionized Gas Thermoelectric Generator (IG-TEG) system that has been studied theoretically showing capabilities to continually extracting energy from the thermal energy of the ambient air, at low temperatures within the standard room temperature and below. This system does not need a temperature gradient in order to work, unlike the other TEGs that use Seebeck effect, and therefore this new system can be utilized for cooling purposes, by extracting energy instead of wasting energy in compressing the gas for cooling. This novel system was designed based on Static Ratchet Potential (SRP), which is known as a spatially asymmetric electric potential produced by an array of positive and negative electrodes. The ratchet potential produces electrical current from random Brownian Motion of charged particles that are driven by thermal energy. Ratchet potential was studied and investigated by several researches in the fields of sensing and energy harvesting. The main ratchet potential system parameter is the particles transportation, this parameter was studied under the condition of flashing ratchet potentials, and was analyzed based on several methods. In this study, a different approach is pursued to estimate particles transportation, by evaluating the charged particles distribution, and applying the other conditions of the SRP.

show abstract

Section: Introductionmentioning

confidence: 99%

Ionized Gas Thermoelectric Generator: Theoretical Evaluation and Efficiency Estimation

Bqoor¹,

Hamdan²,

Janajreh³

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In this context, there have recently been several experimental [38][39][40] and numerical [41][42][43][44][45][46][47][48] studies on polymer ratchet devices. A large majority of these studies consists of an external periodic potential field and does not have any geometric restrictions on the system.…”

Section: Introductionmentioning

confidence: 99%

“…Also, they observe a resonant activation like enhancement in chain velocity at an optimum driving frequency. Recently, Wang and co-workers 48 have studied the role of hydrodynamic interactions in an entropic polymer ratchet system using explicit solvent molecular dynamics simulation technique. They found complex responses from the associated ratchet device to the structural asymmetry, frequency of the external electric field, and the nature of charge distribution on the PE.…”

Section: Introductionmentioning

confidence: 99%

“…In short, Refs. [46][47][48] show that the broken reflection symmetry of a confined channel provides a space dependent asymmetric entropic potential on the confined macromolecules and in the presence of other essential ratcheting ingredients an entropic polymer ratchet device can be realized. In a different geometric setup, the broken spatial reflection symmetry of geometric obstacles in a micro-fabricated sieve has been found to be useful for separation of macromolecules and PEs of different sizes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ratchet rectification effect on the translocation of a flexible polyelectrolyte chain

Mondal

Muthukumar

2016

The Journal of Chemical Physics

View full text Add to dashboard Cite

We report a three dimensional Langevin dynamics simulation of a uniformly charged flexible polyelectrolyte chain, translocating through an asymmetric narrow channel with periodically varying cross sections under the influence of a periodic external electric field. When reflection symmetry of the channel is broken, a rectification effect is observed with a favored direction for the chain translocation. For a given volume of the channel unit and polymer length, the rectification occurs below a threshold frequency of the external periodic driving force. We have also observed that the extent of the rectification varies non-monotonically with increasing molecular weight and the strength of geometric asymmetry of the channel. Observed non-monotonicity of the rectification performance has been interpreted in terms of a competition between two effects arising from the channel asymmetry and change in conformational entropy. An analytical model is presented with predictions consistent with the simulation results.

show abstract

“…3 However, solid surfaces can be designed to control the structure and dynamics of macromolecules. For example, a nano-patterned surface, 4 an entropic trap, 5 a ratchet slit, 6 and an orthogonal surface 7 enhance the fractionation of DNA and other macromolecules compared to a smooth surface. A polymer chain in such constrained geometries experiences anomalous diffusion, entropic trapping, loop-train conformation, adsorption-desorption, and reptation, etc.…”

Section: Introductionmentioning

confidence: 99%

Localization and stretching of polymer chains at the junction of two surfaces

Patra

Singh

2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

We present a molecular dynamics study on the stretching of a linear polymer chain that is adsorbed at the junction of two intersecting flat surfaces of varying alignments. We observe a transition from a two-dimensional to one-dimensional (1D) structure of the adsorbed polymer when the alignment, i.e., the angle between the two surfaces that form a groove, θ, is below 135°. We show that the radius of gyration of the polymer chain Rg scales as Rg ∼ N(3/4) with the degree of polymerization N for θ = 180° (planer substrate), and the scaling changes to Rg ∼ N(1.0) for θ < 135° in good solvents. At the crossover point, θ = 135°, the exponent becomes 1.15. The 1D stretching of the polymer chain is found to be 84% of its contour length for θ ⩽ 90°. The center of mass diffusion coefficient D decreases sharply with θ. However, the diffusion coefficient scales with N as D ∼ N(-1), and is independent of θ. The relaxation time τ, for the diffusive motion, scales as τ ∼ N(2.5) for θ = 180° (planar substrate), which changes to τ ∼ N(3.0) for θ ⩽ 90°. At the crossover point, the exponent is 3.4, which is slightly higher than the 1D value of 3.0. Further, a signature of reptation-like dynamics of the polymer chain is observed at the junction for θ ⩽ 90° due to its strong 1D localization and stretching.

show abstract

Net motion of a charged macromolecule in a ratchet-slit

Cited by 8 publications

References 24 publications

Ionized Gas Thermoelectric Generator: Theoretical Evaluation and Efficiency Estimation

Ionized Gas Thermoelectric Generator: Theoretical Evaluation and Efficiency Estimation

Ratchet rectification effect on the translocation of a flexible polyelectrolyte chain

Localization and stretching of polymer chains at the junction of two surfaces

Contact Info

Product

Resources

About