Brownian molecular rotors: Theoretical design principles and predicted realizations

Schönborn, Jan Boyke; Herges, Rainer; Hartke, Bernd

doi:10.1063/1.3148223

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…Nature has created two distinct keys of molecular machines to operate the life forms. The keys are two types of protein-based molecular motors, one that runs under the electromagnetic or electric power supply, namely PS motor, and one that runs by diffusive fluid flow, namely BR. − Is it possible to combine the PS and BR concepts artificially in a single machine to resolve one of the key problems of energy harvesting? The fusion of these two widely varied concepts in a single molecule was never attempted before.…”

Section: Introductionmentioning

confidence: 99%

Radio Waveguide–Double Ratchet Rotors Work in Unison on a Surface to Convert Heat into Power

et al. 2020

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Synchronizing thousands of 100% efficient rotors in a macrodevice for harvesting noise is unapprehended. Thermodynamically, realizing a thermal gradient at the atomic scale is critical. Harvesting free thermal energy or noise by resonance has a hidden clause; either externally activating a directed self-powered motion or constructing a nanoscale power supply. To accomplish this, we combined two rotor concepts, Brownian rotor, BR, and power stroke, PS, rotors available in living systems in two planes of a single molecule. Quantum tunneling images reveal how a radio-wave guided synchronization of PS-BR combination tweaks rotational dynamics of a rotor to bypass the necessity of temperature gradient (ΔT). Live imaging of thermal noise movement as electron density between a pair of molecular planes helped in optimizing the rotor design. The rotor's monolayer harvests heat from the liquid's Brownian noise and electromagnetic noise, together delivering a finite, usable power. The chip supplies the power if we wet the surface or shine electric noise.

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Section: Introductionmentioning

confidence: 99%

Radio Waveguide–Double Ratchet Rotors Work in Unison on a Surface to Convert Heat into Power

et al. 2020

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“…For the damping rate γ • ≤ 10 8 (e.g. for the value 1.3 • 10 6 Hz for the nonpolar solvent as the environment for the internal rotation regarding the toluene molecule [21]), the typical rates of operation of the order of 10 −12 s [40][41][42][43] deeply fall in the quantum mechanical domain. That is, such operations are by 10 3 (i.e.…”

Section: Discussionmentioning

confidence: 99%

Dynamical stability of the one-dimensional rigid Brownian rotator: The role of the rotator's spatial size and shape

Jeknić-Dugić,

Petrović,

Arsenijević

et al. 2018

Preprint

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We investigate dynamical stability of a single propeller-like shaped molecular cogwheel modelled as the fixed-axis rigid rotator. In the realistic situations, rotation of the finite-size cogwheel is subject of the environmentally-induced Brownian-motion effect that we describe by utilizing the quantum Caldeira-Leggett master equation. Assuming the initially narrow (classical-like) standard deviations for the angle and the angular momentum of the rotator, we investigate dynamics of the first and second moments depending on the size, i.e., on the number of blades of both the free rotator as well as of the rotator in the external harmonic field. The larger the standard deviations, the less stable (i.e. less predictable) rotation. We detect the absence of the simple and straightforward rules for utilizing the rotator's stability. Instead, a number of the size-related criteria appear whose combinations may provide the optimal rules for the rotator dynamical stability and possibly control. In the realistic situations, the quantum-mechanical corrections, albeit individually small, may effectively prove non-negligible, and also revealing subtlety of the transition from the quantum to the classical dynamics of the rotator. As to the latter, we detect a strong size-dependence of the transition to the classical dynamics beyond the quantum decoherence process.

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“…One aspect is the biological molecular motors such as motor proteins like kinesins and dyneins, which exist in large quantity in the human body and are responsible for the transport of cell organelles along the cytoskeleton [1][2][3][4][5]. Another aspect is artificial molecular motors and nanomachines which help to utilize energy resources at the microscopic scale [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A generalized model of an irreversible thermal Brownian refrigerator and its performance

Chen

Ding

Sun

2011

Applied Mathematical Modelling

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a b s t r a c tA generalized model of an irreversible thermal Brownian refrigerator, which consists of Brownian particles moving in a periodic sawtooth potential with external forces and contacting with the alternating hot and cold reservoirs along the space coordinate, is established in this paper. The heat flows driven by both potential and kinetic energies of the particles as well as the heat leakage between the hot and cold reservoirs are taken into account. The optimum performance of the generalized model is analyzed using the theory and method of finite time thermodynamics. The analytical expressions for cooling load, coefficient of performance (COP) and power input of the Brownian refrigerator are derived. It is shown by numerical examples that due to the heat leakage between the heat reservoirs and heat flow via the change of kinetic energy of the particles, the Brownian refrigerator is always irreversible and the COP can never attain the Carnot COP. The influences of the heat leakage, the external force, barrier height of the potential, asymmetry of the sawtooth potential and temperature ratio of the heat reservoirs on the performance of the Brownian refrigerator are also investigated in detail. The effective regions of external force and barrier height of the potential in which the Brownian motor can operate as a refrigerator are determined. It is found that the performance of the Brownian refrigerator depends strictly on the design parameters. If these design parameters are properly chosen, the Brownian refrigerator can be controlled to operate in the optimal regimes. The results obtained herein about the general Brownian refrigerator model include those obtained in many previous literatures.

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Brownian molecular rotors: Theoretical design principles and predicted realizations

Cited by 12 publications

References 26 publications

Radio Waveguide–Double Ratchet Rotors Work in Unison on a Surface to Convert Heat into Power

Radio Waveguide–Double Ratchet Rotors Work in Unison on a Surface to Convert Heat into Power

Dynamical stability of the one-dimensional rigid Brownian rotator: The role of the rotator's spatial size and shape

A generalized model of an irreversible thermal Brownian refrigerator and its performance

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