Particle-settling in iper-viscous liquids and its use for time measurement

Materials for time measurement represent a new class of functional materials, that can be used to fabricate a variety of devices useful for industrial applications, like for example the shelf-life indicators, solid-state chronometers, compact detonators, etc. Materials for time measurement require to have a continuously self-changing property that vary linearly during the time. The particle-settling phenomenon can be advantageously used to fabricate this type of materials. A theoretical model based on simple fluid-dynamics considerations for Newtonian fluids has been developed to obtain the temporal evolution of the electrical conductance for these materials, in order to verify its linear behaviour.