"The droplet goes in a flexible sandwich of the substance
polydimethylsiloxane,
or PDMS. The sensor acts as a variable electrical capacitor. When the
sensor is pressed down, the sensing droplet is squeezed over conductive
electrodes, increasing its capacitance," reports
PhysOrg. "The sensor also could be used in 'smart
gloves,' giving physicians an enhanced ability to measure the firmness
of tissues and detect tumors, and in 'smart contact lenses,' to monitor
intraocular pressure without affecting vision."
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