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      Physical Properties of Composites Near Percolation

      , ,
      Annual Review of Materials Research
      Annual Reviews

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          Effective thermal conductivity of particulate composites with interfacial thermal resistance

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            An all-organic composite actuator material with a high dielectric constant.

            Electroactive polymers (EAPs) can behave as actuators, changing their shape in response to electrical stimulation. EAPs that are controlled by external electric fields--referred to here as field-type EAPs--include ferroelectric polymers, electrostrictive polymers, dielectric elastomers and liquid crystal polymers. Field-type EAPs can exhibit fast response speeds, low hysteresis and strain levels far above those of traditional piezoelectric materials, with elastic energy densities even higher than those of piezoceramics. However, these polymers also require a high field (>70 V micro m(-1)) to generate such high elastic energy densities (>0.1 J cm(-3); refs 4, 5, 9, 10). Here we report a new class of all-organic field-type EAP composites, which can exhibit high elastic energy densities induced by an electric field of only 13 V micro m(-1). The composites are fabricated from an organic filler material possessing very high dielectric constant dispersed in an electrostrictive polymer matrix. The composites can exhibit high net dielectric constants while retaining the flexibility of the matrix. These all-organic actuators could find applications as artificial muscles, 'smart skins' for drag reduction, and in microfluidic systems for drug delivery.
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              Physics of inhomogeneous inorganic materials

              Ce-Wen Nan (1993)
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                Author and article information

                Journal
                Annual Review of Materials Research
                Annu. Rev. Mater. Res.
                Annual Reviews
                1531-7331
                1545-4118
                June 2010
                June 2010
                : 40
                : 1
                : 131-151
                Article
                10.1146/annurev-matsci-070909-104529
                f773dfb5-9f37-4572-a298-9353f796a477
                © 2010
                History

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