Mechanoelectrical properties of a GnF/PDMS composite controlled by the aspect ratio and concentration of GnF

Park, Sung Min; Nam, Gyungmok; Choi, Young-Tai; Woo, Seungpyo; Uhm, Won-Young; Park, Sang‐Hyun; Yoon, Sang‐Hee

doi:10.1016/j.compscitech.2018.02.032

Cited by 16 publications

(8 citation statements)

References 23 publications

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“…The conductive networks in conductive polymer composites (CPCs) are susceptible to external stimuli and can be used to monitor changes of temperature, strain, damage, and environments such as gas and liquids . During the past decade, great and continuous attention has been paid to improve the piezoresistive behavior of CPCs containing anisotropic carbon-based fillers for application as strain sensors. − …”

Section: Introductionmentioning

confidence: 99%

Tuning the Piezoresistive Behavior of Poly(Vinylidene Fluoride)/Carbon Nanotube Composites Using Poly(Methyl Methacrylate)

Tang

Pötschke

Pionteck

et al. 2020

ACS Appl. Mater. Interfaces

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In conductive polymer composites (CPCs), which can be used as both strain sensors and materials with self-diagnosis capabilities for structural health monitoring, the piezoresistive sensitivity can be tuned by changing the electrical filler network structure, mainly influenced by the conductive filler content. Typically, the electrical resistance increases exponentially with strain, and the piezoresistive sensitivity and linearity cannot be improved simultaneously. In this work, we report a facile method to tune the piezoresistive behavior of melt-mixed poly(vinylidene fluoride) (PVDF)/carbon nanotube (CNT, 0.75−2.0 wt %) composites using blending with poly(methyl methacrylate) (PMMA, 5−30 wt %). PVDF and PMMA are completely miscible in the melt state regardless of the proportion. For PVDF-rich blends, the crystallization of PVDF induces separation of the PVDF crystal region from the miscible PVDF/PMMA amorphous blend part during the cooling process. Addition of PMMA tuned the piezoresistive strain behavior and improved the electrical conductivity and toughness at the same time. The PVDF/PMMA/CNT composites show higher sensitivity at low strains than their PVDF/CNT counterparts with comparable initial resistivity. For example, ΔR/R 0 at 5% strain is 18.6% for the PVDF(80)/ PMMA(20) blend containing 0.75 wt % CNT versus 11.0% for PVDF containing 1 wt % CNT, both having a volume resistivity of around 10 4 Ω•cm. The PVDF/PMMA/CNT blend composites also show a less steep exponential increase in the sensing response at higher strains, indicating better linearity. These differences are due to the altered microstructure of the composites and the more homogeneous distribution of CNTs between the smaller and less numerous PVDF crystallites when PMMA is added. The concept of modifying the composite microstructure by adding another commercially available miscible polymer offers a simple and effective way to tune the piezoresistive behavior and improve mechanical properties of CPC sensor materials.

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Section: Introductionmentioning

confidence: 99%

Tuning the Piezoresistive Behavior of Poly(Vinylidene Fluoride)/Carbon Nanotube Composites Using Poly(Methyl Methacrylate)

Tang

Pötschke

Pionteck

et al. 2020

ACS Appl. Mater. Interfaces

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“…From the point of view of structural mechanics, material property and the thickness of the top wall will influence the top wall deformation and which in turn will have an effect on the flow inside the channel. The density of PDMS is assumed to be constant = 965 𝑘𝑔/𝑚 3 for this study (Park et al 2018;Zhao et al 2022). However, the stiffness value can vary depending on the base/curing agent ratio and curing temperature (Johnston et al, 2014;Lötters et al, 1997), and it will have an influence on the wall flexibility.…”

Section: Parameters Influencing Flow In the Channel And The Induced D...mentioning

confidence: 99%

Pressure-flow characteristics of a microchannel combining super- hydrophobicity and wall compliance

Kumar

Assam

Raj

2023

Preprint

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This paper reports a computational and theoretical investigation of pressure-flow characteristics of a microchannel having a superhydrophobic bottom wall with embedded air-cavities and, thin deformable membrane as the top wall. Two-way fluid-structure interaction (FSI) and unsteady volume of fluid (VOF) methods are employed for fluid-solid boundary and liquid-air interface at ridge-cavity, respectively. A novel theoretical model has been developed for the pressure-flow characteristics of microchannel with deformable top and superhydrophobic bottom wall. The theoretical and numerical results for pressure drop across the microchannel have shown a good agreement with a maximum deviation of 6.69%. Four distinct types of microchannels viz, smooth (S) (rigid non-textured), smooth with deformable top (SDT), smooth with superhydrophobic bottom (SSB) and, smooth with superhydrophobic bottom and deformable top wall (SSBT) have been investigated for the comparison of their pressure-flow characteristics. The Poiseuille Numbers (fRe) for SSBDT microchannel is found to be lowest with an average of 18.7% and maximum of 23.5% lower than S microchannel at 𝑅𝑒 = 60. Up to 48.59% of reduction in pressure drop was observed for the SSBDT microchannel as compared to smooth (S) microchannel of same dimensions. Further, critical Reynolds Number (Recritical) (at which the air-water interface breaks and super-hydrophobicity vanishes) was found to be ∼ 20% higher for SSBDT microchannel compared to SSB microchannel. Thus, the wall compliance in SSBDT microchannel is found to increase the capability to sustain the super-hydrophobicity at higher Re numbers.

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“…Such graphene/PDMS nanocomposites sensors showed sensitive electromechanical response to static and dynamically applied forces, which can be used to develop force sensors capable of describing human pressure perception ability. By mixing graphene nanoflakes with PDMS, Park et al [135] manufactured composites tunable materials properties, which can be used as smart sensors. The aspect ratio and concentration of the graphene fillers are found to have significant influences on the electromechanical behaviors of the nanocomposites (as shown in Figure 22).…”

Section: Gn Epoxymentioning

confidence: 99%

“…To further understand the electromechanical behaviors of their manufactured graphene/PDMS composites, Park et al [135] discussed empirical models predicting the electrical and mechanical properties of the nanocomposites and addressed their limitations. The work is expected to help develop graphene-reinforced PDMS composite-based sensors for potential application in structural health monitoring.…”

Section: Theoretical Modelingmentioning

confidence: 99%

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Electromechanical Behaviors of Graphene Reinforced Polymer Composites: A Review

et al. 2020

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Graphene (including its derivatives)-reinforced polymer composites (GRPCs) have been drawing tremendous attention from academic and industrial communities for developing smart materials and structures. Such interest stems from the excellent combination of the mechanical and electrical properties of these composites while keeping the beneficial intrinsic attributes of the polymers, including flexibility, easy processability, low cost and good biological and chemical compatibility. The electromechanical performances of these GRPCs are of great importance for the design and optimization of engineering structures and components. Extensive work has been devoted to this topic. This paper reviews the recent studies on the electromechanical behaviors of GRPCs. First the methods and techniques to manufacture graphene and GRPCs are introduced, in which the pros and cons of each method are discussed. Then the experimental examination and theoretical modeling on the electromechanical behaviors of the nanocomposites are presented and discussed.

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Mechanoelectrical properties of a GnF/PDMS composite controlled by the aspect ratio and concentration of GnF

Cited by 16 publications

References 23 publications

Tuning the Piezoresistive Behavior of Poly(Vinylidene Fluoride)/Carbon Nanotube Composites Using Poly(Methyl Methacrylate)

Tuning the Piezoresistive Behavior of Poly(Vinylidene Fluoride)/Carbon Nanotube Composites Using Poly(Methyl Methacrylate)

Pressure-flow characteristics of a microchannel combining super- hydrophobicity and wall compliance

Electromechanical Behaviors of Graphene Reinforced Polymer Composites: A Review

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