Tailoring Material Stiffness by Filler Particle Organization

Tsai, Pei-Ying; Ghosh, Subir; Wu, Peidong; Puri, Ishwar K.

doi:10.1021/acsami.6b10895

Cited by 13 publications

(12 citation statements)

References 28 publications

(42 reference statements)

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“…The effect of Ni‐MWNT alignment coupled with better directional dispersion improves the load bearing capability of the nanocomposite. These results clarify that nanoparticle organization can be used to tailor the mechanical properties of a nanocomposite .…”

Section: Resultssupporting

confidence: 52%

Tailoring the properties of a polymer nanocomposite with a magnetic field

2018

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The properties of nanocomposites can be tailored by organizing nanoparticles within the polymer matrix, that is, for potential aerospace, automobile, and infrastructure applications. Multiwalled carbon nanotubes are coated with nickel to produce hybrid Ni‐MWNT nanoparticles. These magnetized nanoparticles are introduced into an epoxy matrix at a relatively low 0.25%–1% volume fraction and oriented along particular directions with an external magnetic field . Changing this alignment makes it possible to tailor the properties of the resulting composite material, that is, its tensile strength, microscopic elastic modulus, and electrical resistivity. The alignment imparts anisotropic properties to the bulk material, but when the nanoparticles are aligned in perpendicular directions in two sequential layers, this coupled orientation produces an overall isotropic composite material. The tensile strength of a nanocomposite containing 0.25 vol% of aligned Ni‐MWNT nanoparticles is ∼9% higher than of pure epoxy. Its AC electrical resistivity along the alignment direction is reduced by ∼20% in comparison with an epoxy composite containing a similar volume fraction of randomly dispersed nanoparticles. These outcomes reveal that, even at a relatively low nanoparticle volume fraction, the alignment of Ni‐MWNTs in epoxy with an external magnetic field induces property anisotropy, which can be tuned through multidirectional alignment. POLYM. COMPOS., 40:779–788, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 52%

Tailoring the properties of a polymer nanocomposite with a magnetic field

2018

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“…The addition of conductive filler particles into an elastomer matrix improves the bulk relative permittivity of the composite, predictions of which can be based on mixing rules or effective medium theory. [3][4][5] However, since predictive methods only consider the volume fractions of the constituents, the geometrical arrangement of the filler particles, which also influences the bulk properties of the composite, 6,7 is not appropriately represented.…”

mentioning

confidence: 99%

Influence of particle arrangement on the permittivity of an elastomeric composite

et al. 2017

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Elastomers are used as dielectric layers contained between the parallel conductive plates of capacitors. The introduction of filler particles into an elastomer changes its permittivity ε. When particle organization in a composite is intentionally varied, this alters its capacitance. Using numerical simulations, we examine how conductive particle chains introduced into polydimethylsiloxane (PDMS) alter ε. The effects of filler volume fraction ψ, interparticle d and interchain spacing a, zigzag angle θ between adjacent particles and overall chain orientation, particle size r, and clearance h between particles and the conductive plates are characterized. When filler particles are organized into chainlike structures rather than being just randomly distributed in the elastomer matrix, ε increases by as much as 85%. When particles are organized into chainlike forms, ε increases with increasing ψ and a, but decreases with increasing d and θ. A composite containing smaller particles has a higher ε when ψ<9% while larger particles provide greater enhancement when ψ is larger than that value. To enhance ε, adjacent particles must be interconnected and the overall chain direction should be oriented perpendicular to the conductive plates. These results are useful for additive manufacturing on electrical applications of elastomeric composites.

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“…37 The mechanical properties can be tuned over a wide range of Young’s modulus if the particles are internally ordered. 38…”

Section: Introductionmentioning

confidence: 99%

“…The flow-through reactor configuration of our microfluidic cell lends itself well to additive manufacturing and rapid prototyping platforms, leading to an increase in throughput, material yield, reduced operating costs, and improved production time. Future work will focus on mitigating defects in assembled structures and applying this platform to additive manufacturing of polymer–particle composites, where the degree of order between particles can influence composite mechanical 38 or optical 39 properties.…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Acoustofluidic Self-Assembly of Colloidal Crystals

Akella

Juárez

2018

ACS Omega

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Colloidal crystals are encountered in a variety of energy-harvesting applications, where they serve as waveguides or filters for electromagnetic and electro-optic energy. Techniques such as electric or magnetic assembly are used to assemble colloidal crystals, but are limited by crystal size, yield, and throughput. This article demonstrates the continuous, high-throughput assembly of two-dimensional (2D)-colloidal crystals in an acoustofluidic flow cell. The device is fabricated using off-the-shelf components and does not require a clean-room access. An experimental state diagram shows how the fluid flow rate and voltage applied to the piezoelectric element in our device can tune the crystal microstructure. Highly ordered colloidal crystals are continuously assembled in less than a minute with a throughput yield of several hundred particles per minute using this device. The acoustically assembled ordered 2D crystals are immobilized using a UV-curable resin and extracted as ordered polymer–particle fibers, demonstrating the ability of using acoustic fields to assemble ordered structures embedded in bulk materials. Particle tracking is used to construct the cross-channel particle distribution to understand the effect of acoustic compression on colloidal crystal assembly. Microparticle image velocimetry data is compared to a theoretical transport model to quantify the effect fluid flow and acoustic trapping has on the colloidal crystal ensemble.

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Tailoring Material Stiffness by Filler Particle Organization

Cited by 13 publications

References 28 publications

Tailoring the properties of a polymer nanocomposite with a magnetic field

Tailoring the properties of a polymer nanocomposite with a magnetic field

Influence of particle arrangement on the permittivity of an elastomeric composite

High-Throughput Acoustofluidic Self-Assembly of Colloidal Crystals

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