Periodic Architecture for High Performance Shock Absorbing Composites

Misra, Abha; Kumar, Praveen

doi:10.1038/srep02056

Cited by 16 publications

(19 citation statements)

References 31 publications

(38 reference statements)

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“…This problem is also exacerbated by polymers such as polydimethylsiloxane (PDMS) and silicon rubber [ 7 ]. PDMS behaves linear elastic at strains less than 25% and became non-linear at larger strains [ 11 , 12 ]. This is a factor needs to be considered in measuring cell traction forces based on PDMS micropillar because large deformations of PDMS micropillars are usually observed when cells adhered to the micropillars [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Tracking Traction Force Changes of Single Cells on the Liquid Crystal Surface

et al. 2015

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Cell migration is a key contributor to wound repair. This study presents findings indicating that the liquid crystal based cell traction force transducer (LCTFT) system can be used in conjunction with a bespoke cell traction force mapping (CTFM) software to monitor cell/surface traction forces from quiescent state in real time. In this study, time-lapse photo microscopy allowed cell induced deformations in liquid crystal coated substrates to be monitored and analyzed. The results indicated that the system could be used to monitor the generation of cell/surface forces in an initially quiescent cell, as it migrated over the culture substrate, via multiple points of contact between the cell and the surface. Future application of this system is the real-time assaying of the pharmacological effects of cytokines on the mechanics of cell migration.

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Section: Introductionmentioning

confidence: 99%

Tracking Traction Force Changes of Single Cells on the Liquid Crystal Surface

et al. 2015

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“…Demand is increasing for porous nanomaterials that can absorb and dissipate energy for civil and military applications. 1 In recent years, a variety of nanoporous materials have been developed for use as light-weight energy dissipation materials, such as ultralight metallic microlattices and nanosilica, 2,3 molecularly intercalated nanoakes, 4,5 periodic bicontinuous composites, [6][7][8][9] and carbon nanomaterials. [10][11][12][13][14] Selection of appropriate materials and design of the geometrical structure are two effective approaches to construct energy dissipation materials with high mass-or volume-specic energy absorption.…”

Section: Introductionmentioning

confidence: 99%

Integrated random-aligned carbon nanotube layers: deformation mechanism under compression

et al. 2014

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Carbon nanotubes have the potential to construct highly compressible and elastic macroscopic structures such as films, aerogels and sponges. The structure-related deformation mechanism determines the mechanical behavior of those structures and niche applications. Here, we show a novel strategy to integrate aligned and random nanotube layers and reveal their deformation mechanism under uniaxial compression with a large range of strain and cyclic testing. Integrated nanotube layers deform sequentially with different mechanisms due to the distinct morphology of each layer. While the aligned layer forms buckles under compression, nanotubes in the random layer tend to be parallel and form bundles, resulting in the integration of quite different properties (strength and stiffness) and correspondingly distinct plateau regions in the stress-strain curves. Our results indicate a great promise of constructing hierarchical carbon nanotube structures with tailored energy absorption properties, for applications such as cushioning and buffering layers in microelectromechanical systems.

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“…15 The details of the fabrication procedure of the two types of composites, with uniform and architectured microstructures, are outlined below. PDMS was chosen as it is one of most widely used polymers with well-dened mechanical behavior.…”

Section: Methodsmentioning

confidence: 99%

Novel architecture for anomalous strengthening of a particulate filled polymer matrix composite

et al. 2015

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We propose an architecture for dramatically enhancing the stress bearing and energy absorption capacities of a polymer based composite. Different weight fractions of iron oxide nano-particles (NPs) are mixed in a poly(dimethylesiloxane) (PDMS) matrix either uniformly or into several vertically aligned cylindrical pillars.These composites are compressed up to a strain of 60% at a strain rate of 0.01 s À1 following which they are fully unloaded at the same rate. Load bearing and energy absorption capacities of the composite with uniform distribution of NPs increase by $50% upon addition of 5 wt% of NPs; however, these properties monotonically decrease with further addition of NPs so much so that the load bearing capacity of the composite becomes 1/6 th of PDMS upon addition of 20 wt% of NPs. On the contrary, stress at a strain of 60% and energy absorption capacity of the composites with pillar configuration monotonically increase with the weight fraction of NPs in the pillars wherein the load bearing capacity becomes 1.5 times of PDMS when the pillars consisted of 20 wt% of NPs. In situ mechanical testing of composites with pillars reveals outward bending of the pillars wherein the pillars and the PDMS in between two pillars, located along a radius, are significantly compressed. Reasoning based on effects of compressive hydrostatic stress and shape of fillers is developed to explain the observed anomalous strengthening of the composite with pillar architecture.

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Periodic Architecture for High Performance Shock Absorbing Composites

Cited by 16 publications

References 31 publications

Tracking Traction Force Changes of Single Cells on the Liquid Crystal Surface

Tracking Traction Force Changes of Single Cells on the Liquid Crystal Surface

Integrated random-aligned carbon nanotube layers: deformation mechanism under compression

Novel architecture for anomalous strengthening of a particulate filled polymer matrix composite

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