Dissipative particle dynamics simulation of the soft micro actuator using polymer chain displacement in electro-osmotic flow

Zakeri, Ramin

doi:10.1080/08927022.2019.1648810

Cited by 9 publications

(10 citation statements)

References 25 publications

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“…As can be seen, changes in and electric field have a linear relationship with increasing velocity, but the ion concentration non-linearly increases to a certain velocity and no significant change is seen after a certain amount. Also, the validation of polymer chain in nano channel has been reported in ref 31 . It can be concluded that on a particle scale, the DPD method has a proper accuracy in analyzing the complex test cases such as electro-osmotic flow and can be simulated for more complex situations such as simulation of a micro myosin performance in EOF.…”

Section: Resultsmentioning

confidence: 99%

“…The radius of gyration indicator can describe the distribution the dimensions of a polymer chain. The radius of gyration is the root mean square distance ( of particle from the center of mass (cm) which is presented as 31 – 33 , 37 , 38 in which, is the mean position of the polymer chain, and n is the beads number in a monomer. Also, for calculation of VACF, at the first, velocity of the center-of-mass of the polymer chain ( should be calculated: where is iteration number of time step and consequently it will use for updating and label of the register.…”

Section: Methodsmentioning

confidence: 99%

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Towards bio-inspired artificial muscle: a mechanism based on electro-osmotic flow simulated using dissipative particle dynamics

Zakeri

2021

Sci Rep

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One of the unresolved issues in physiology is how exactly myosin moves in a filament as the smallest responsible organ for contracting of a natural muscle. In this research, inspired by nature, a model is presented consisting of DPD (dissipative particle dynamics) particles driven by electro-osmotic flow (EOF) in micro channel that a thin movable impermeable polymer membrane has been attached across channel width, thus momentum of fluid can directly transfer to myosin stem. At the first, by validation of electro-osmotic flow in micro channel in different conditions with accuracy of less than 10 percentage error compared to analytical results, the DPD results have been developed to displacement of an impermeable polymer membrane in EOF. It has been shown that by the presence of electric field of 250 V/m and Zeta potential − 25 mV and the dimensionless ratio of the channel width to the thickness of the electric double layer or kH = 8, about 15% displacement in 8 s time will be obtained compared to channel width. The influential parameters on the displacement of the polymer membrane from DPD particles in EOF such as changes in electric field, ion concentration, zeta potential effect, polymer material and the amount of membrane elasticity have been investigated which in each cases, the radius of gyration and auto correlation velocity of different polymer membrane cases have been compared together. This simulation method in addition of probably helping understand natural myosin displacement mechanism, can be extended to design the contraction of an artificial muscle tissue close to nature.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Towards bio-inspired artificial muscle: a mechanism based on electro-osmotic flow simulated using dissipative particle dynamics

Zakeri

2021

Sci Rep

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“…Some scholars have noticed that using soft material and power of fluid can pressurize bag or be evacuated for deflation, called origami-inspired artificial muscles [28], these mechanism are reported that can lift objects more than 1000 times more than own weights. To specify behavior of this component, simulation of inflation of AMF is carried out for the first time using dissipative particle dynamics (DPD) [39][40][41][42][43]. DPD is a particle based method for simulation of fluids especially in the case of interaction of fluid particles and membrane particles or polymer chain, this approach has been recently applied for this type of simulation.…”

Section: Dpd-numerical Simulation Of Ammentioning

confidence: 99%

New Artificial Muscle Filament Mechanism Based on Fluids Chemical Reaction and Natural Principle

Zakeri¹,

Reza²

2020

Int J Robot Eng

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In this research, an artificial muscle filament (AMF) as a novel mechanism and small part of the artificial muscle is proposed in which, considering the real natural mechanism and necessity and constructability of industrial manufacturing engineering, AMF with no electric power supply for expansion/contraction provides the conspicuous strong and fast displacement. AMF, inspired by nature, based on the sliding filament theory and combination of advantages of soft and hard materials, employs artificial actin (AA, scissor mechanism) and artificial myosin (AM, soft material). Volume change of AM for displacement of AA is resulted from proposed chemical reaction of sodium bicarbonate (NaHCO3 (s)) solution with water (l) and acetic acid (CH3COOH (l)) which the main advantages of high power to weight ratio (more than 10 times), mimicking nature and expandable to artificial muscle are obtained in simple module structure. Response speed of AMF can be adjusted by controlling the flow rate and gas output from less than 1 second to desired amount. In this study, by applicable notice on numerical simulation of particle dynamics and experimental tests of AM, a laboratory model of AMF with displacement of 50 mm has been fabricated which for various ranges of flow rate and loading condition is evaluated. The AMF based on the filament theory close to nature, due to overcoming the limitation of conventional artificial muscle and correspondingly advantages of simplicity in fabrication and modularity, low cost and weight, high power and fast response time, the proposed mechanism may be employed especial place for the some future industrial applications.

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“…They also studied the laws of the gyration radius and normal and parallel components. Zakeri 39 used the DPD method to simulate the performance of a soft polymer micro-stimulator in an electrosmotic flow (variable force) in a simple micro-channel and a divergent convergent.…”

Section: Introductionmentioning

confidence: 99%

Simulation of nano elastic polymer chain displacement under pressure gradient/electroosmotic flow with the target of less dispersion of transition

Zakeri

Lee

2021

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Since non-scattering transfer of polymer chain in nanochannel is one of the important issue in biology, in this research, the behavior study of a long polymer chain in the nanofluid in two modes of free motion and restricted motion (fixed two ends) under two different forces including constant force (pressure gradient (PG)) and variable force (electroosmotic force (EOF)) has been investigated using dissipative particle dynamics (DPD) method. Our aim is that displacement of polymer chain carries out with less dispersion. Initially, without the presence of polymer, the results have been validated in a nanochannel by analytical results for both cases (PG, EOF) with an error of less than 10%. Then, assuming 50 beads of polymer chain, the polymer chain motion in free motion and fixed two ends modes has been examined by different spring coefficients between beads and different forces including PG (0.01 DPD unite) and EOF (zeta potential = − 25 mV, electric field = 250 V/mm, kh parameter = 8). The results show that in free polymer motion-PG mode, by increasing 1.6 times of spring coefficient of the polymer, a 40% reduction in transition of polymer is achieved, which high dispersion of polymer chain is resulted for this mode. In the EOF, the spring coefficient has a slight effect on transferring of polymer and also, EOF moves the polymer chain with extremely low polymer chain scattering. Also, for fixed two ends-PG mode, a 36% reduction in displacement is achieved and in the same way, in EOF almost 39% declining in displacement is resulted by enhancing the spring coefficients. The results have developed to 25 and 100 beads which less dispersion of polymer chain transfer for free polymer chain-EOF is reported again for both circumstances and for restricted polymer chain state in two PG and EOF modes, less differences are reported for two cases. The results show that the EOF has the benefit of low dispersion for free polymer chain transfer, also, almost equal displacement for restricted polymer chain mode is observed for both cases.

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Dissipative particle dynamics simulation of the soft micro actuator using polymer chain displacement in electro-osmotic flow

Cited by 9 publications

References 25 publications

Towards bio-inspired artificial muscle: a mechanism based on electro-osmotic flow simulated using dissipative particle dynamics

Towards bio-inspired artificial muscle: a mechanism based on electro-osmotic flow simulated using dissipative particle dynamics

New Artificial Muscle Filament Mechanism Based on Fluids Chemical Reaction and Natural Principle

Simulation of nano elastic polymer chain displacement under pressure gradient/electroosmotic flow with the target of less dispersion of transition

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