Polypyrrole (PPy) is one of the most commonly studied conducting polymers due to its good stability, high conductivity, ease of preparation and non-toxicity. The stability of the conductivity of polypyrrole films depends on the choice of dopant anion, the method of preparation, and the conditions of.....
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This invention provides water-dispersible polyurethanes made by reacting a difunctional alcohol, a difunctional isocyanate, and a chain extender containing reactive hydrogen groups, and then neutralizing. This invention also provides aqueous polyurethane dispersions.
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A Capacitive Micromachined Ultrasonic Transducer (CMUT) having a membrane operatively connected to a top electrode and having a bottom electrode having a concave void. When a DC bias voltage is applied, the membrane is deflected towards the bottom electrode such that a peripheral edge region of the .....
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