Second resonance mode phase overlaid on topography of a silica filled blend of epoxied natural rubber (ENR) and polybutadiene rubber (BR), 3µm scan. The black dots correspond to silica particles, the light patches (yellow and orange) to the ENR regions, and the dark patches (purple and black) to the BR regions. This differentiation is only apparent in the second mode phase and is directly related to the local elasticity. Sample courtesy R. Davies and S. Cook, TARRC, UK.
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