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Foo, Choon Chiang

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Choon Chiang

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Foo, Choon Chiang

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2012 - 20142

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Author's Publications: search.filters.isAuthorOfPublication.3b5b1d41-f17b-439f-8c7a-dc4e0f65ee65

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    Natural rubber for sustainable high-power electrical energy generation
    (Royal Society of Chemistry (RSC), 2014) Kaltseis, Rainer; Keplinger, Christoph; Adrian Koh, Soo Jin; Baumgartner, Richard; Goh, Yu Feng; Ng, Wee Hoe; Kogler, Alexander; Tröls, Andreas; Foo, Choon Chiang; Suo, Zhigang; Bauer, Siegfried
    Clean, renewable and abundant sources of energy, such as the vast energy of ocean waves, are untapped today, because no technology exists to convert such mechanical motions to electricity economically. Other sources of mechanical energy, such as motions of people and vibrations of buildings and bridges, can potentially power portable electronics and distributed sensors. Here we show that natural rubber can be used to construct generators of high performance and low cost. Natural rubber has higher elastic modulus, fracture energy and dielectric strength than a commonly studied acrylic elastomer. We demonstrate high energy densities (369 mJ g−1) and high power densities (200 mW g−1), and estimate low levelized cost of electricity (5–11 ct kW−1 h−1). Soft generators based on natural rubber enable clean, low-cost, large-scale generation of electricity.
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    Giant, Voltage-Actuated Deformation of a Dielectric Elastomer under Dead Load
    (American Institute of Physics, 2012) Huang, Jiangshui; Li, Tiefeng; Foo, Choon Chiang; Zhu, Jian; Clarke, David; Suo, Zhigang
    Far greater voltage-actuated deformation is achievable for a dielectric elastomer under equal-biaxial dead load than under rigid constraint usually employed. Areal strains of 488% are demonstrated. The dead load suppresses electric breakdown, enabling the elastomer to survive the snap-through electromechanical instability. The breakdown voltage is found to increase with the voltage ramp rate. A nonlinear model for viscoelastic dielectric elastomers is developed and shown to be consistent with the experimental observations.