Network Polydispersity and Deformation‐Induced Damage in Filled Elastomers

Tehrani, Mohammad; Moshaei, Mohammad Hossein; Sarvestani, Alireza S.

doi:10.1002/mats.201700038

Cited by 8 publications

(11 citation statements)

References 60 publications

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“…In the studies by [33] and [34] the strand length distribution is exponential or close to exponential and therefore very broad. As outlined by [70] random crosslinking gives a Flory-Schulz distributed chain length polydispersity, i.e. a geometrical distribution or in good approximation an exponential distribution [70].…”

Section: Chain Length Polydispersitymentioning

confidence: 99%

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Cell Model Approaches for Predicting the Swelling and Mechanical Properties of Polyelectrolyte Gels

Landsgesell

Holm

2019

Macromolecules

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We present two successive mean-field approximations for describing the mechanical properties and the swelling equilibrium of polyelectrolyte gels in contact with a salt solution. The first mean-field approximation reduces the many-chain problem of a gel to a corresponding single chain problem. The second mean-field step integrates out the degrees of freedom of the flexible chain and the ions. It replaces the particle-based description of the polyelectrolyte with suitable charge distributions and an effective elasticity term. These simplifications result in a computationally very efficient Poisson-Boltzmann cell-gel description. Despite their simplicity, the single chain cell-gel model shows excellent and the PB model very good agreement with explicit molecular dynamics simulations of the reference periodic monodisperse network model for varying chain length, polymer charge fraction, and external reservoir salt concentrations. Comparisons of our models to the Katchalsky model reveal that our approach is superior for strongly charged chains and can also predict the bulk moduli more accurately. We further discuss chain length polydispersity effects, investigate changes in the solvent permittivity, and demonstrate the robustness of our approach to parameter variations coming from several modeling assumptions.

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Section: Chain Length Polydispersitymentioning

confidence: 99%

“…As outlined by [70] random crosslinking gives a Flory-Schulz distributed chain length polydispersity, i.e. a geometrical distribution or in good approximation an exponential distribution [70]. For simplicity, we assume that the chain length is distributed e according to this geometric or Flory-Schulz distribution [72,73]:…”

Section: Chain Length Polydispersitymentioning

confidence: 99%

Cell Model Approaches for Predicting the Swelling and Mechanical Properties of Polyelectrolyte Gels

Landsgesell

Holm

2019

Macromolecules

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“…To couple the velocity and pressure, the SIMPLE scheme is employed (Mashayekhi et al , 2017; Sarlak et al , 2017). Moreover, the convergence criterion is considered 10 −6 for the residuals of all parameters (Shamsi et al , 2017; Parsaiemehr et al , 2018; Rahmati et al , 2018; Toghraie et al , 2018; Tehrani and Sarvestani, 2017a; Tehrani et al , 2018, 2017; Tehrani and Sarvestani, 2017b).…”

Section: Governing Equations [16]mentioning

confidence: 99%

Investigation of laminar fluid flow and heat transfer of nanofluid in trapezoidal microchannel with different aspect ratios

Bakhshi

Khodabandeh

Akbari

et al. 2018

HFF

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Purpose In the present study, laminar steady flow of nanofluid through a trapezoidal channel is studied by using of finite volume method. The main aim of this paper is to study the effect of changes in geometric parameters, including internal and external dimensions on the behavior of heat transfer and fluid flow. For each parameter, an optimum ratio will be presented. Design/methodology/approach The results showed that in a channel cell, changing any geometric parameter may affect the temperature and flow field, even though the volume of the channel is kept constant. For a relatively small hydraulic diameter, microchannels with different angles have a similar dimensionless heat flux, while channels with bigger dimensions show various values of dimensionless heat flux. By increasing the angles of trapezoidal microchannels, dimensionless heat flux per unit of volume increases. As a result, the maximum and minimum heat transfer rate occurs in a trapezoidal microchannel with 75° and 30 internal’s, respectively. In the study of dimensionless heat flux rate with hydraulic diameter variations, an optimum hydraulic diameter (Dh) was observed in which the heat transfer rate per unit volume attains maximum value. Findings This optimum state is predicted to happen at a side angle of 75° and hydraulic diameter of 290 µm. In addition, in trapezoidal microchannel with higher aspect ratio, dimensionless heat flux rate is lower. Changing side angles of the channels and pressure drop have the same effect on pressure drop. For a constant pressure drop, if changing the side angles causes an increase in the rectangular area of the channel cross-section and the effect of the sides are not felt by the fluid, then the dimensionless heat flux will increase. By increasing the internal aspect ratio (t_2/t_3), the amount of t_3 decreases, and consequently, the conduction resistance of the hot surface decreases. Originality/value The effects of geometry of the microchannel, including internal and external dimensions on the behavior of heat transfer and fluid flow for pressure ranges between 2 and 8 kPa.

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“…The high initial cost of such systems, as well as the cheap supply of oil and gas [7][8][9], had hindered the development of these systems. One of the most demerits of fossil fuels is the storage problems like shell damage during corrosion or buckling, which lead to many environmental problems [10][11][12][13][14][15]. There are many renewable and new generation energy sources like solar energy, and solid-state electrocatalysis plays a crucial role in the development of renewable energy to reshape current and future energy needs [16][17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of The Use of Titanium Dioxide Nanoparticles in Solar Cells

Luo

2020

MJMIE

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Today, nanoparticles have attracted the attention of many researchers due to their special properties as well as their many technological applications. Among these, titanium dioxide nanoparticles have many important applications in various industries due to their excellent optical, electrical and catalytic properties. These applications include use in industrial pigments, as photocatalysts in environmental cleansing, in sunscreens to protect the skin, in photovoltaic applications for solar cells, sensors, in electronic device components, and many more. Two important properties of this material that make it very efficient and useful in life are its photocatalytic and superhydrophobic properties. These two properties are used to purify water and wastewater, eliminate air pollution and buildings, accelerate photochemical reactions such as hydrogen production, fabricate surfaces and layers and self-cleaning glass. The properties of titanium dioxide nanoparticles are strongly dependent on the size of the doped particles, elements or compounds and the surface modifications made on them, which in turn are influenced by the nanoparticle synthesis method. For this reason, methods for the synthesis of titanium dioxide nanoparticles have received much attention today. As the size of the material gets smaller and smaller and reaches the nanoscale, new physical and chemical properties show up. Among the unique properties of nanomaterials, the motion of electrons and holes in semiconductor nanomaterials is dominated by quantum constraint, and the transfer properties of phonons and photons are strongly influenced by the size and geometry of the material. The effective surface area and surface to volume ratio increase with decreasing the material size. High effective levels are achieved by small particles, which will be useful in many 2TiO-based types of equipment in which the interaction of the common surface of the material is important.

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Network Polydispersity and Deformation‐Induced Damage in Filled Elastomers

Cited by 8 publications

References 60 publications

Cell Model Approaches for Predicting the Swelling and Mechanical Properties of Polyelectrolyte Gels

Cell Model Approaches for Predicting the Swelling and Mechanical Properties of Polyelectrolyte Gels

Investigation of laminar fluid flow and heat transfer of nanofluid in trapezoidal microchannel with different aspect ratios

Investigation of The Use of Titanium Dioxide Nanoparticles in Solar Cells

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