News Finding: Microhydraulic actuators consist of thin layers of solid sheets separated by fluidic drops and move these layers relative to each other by internally modifying surface energy with electrowetting. They borrow in form and... 
Paper Finding: This results in a quadratic increase in force density as dimensions are reduced.
News Context: Microhydraulic actuators consist of thin layers of solid sheets separated by fluidic drops and move these layers relative to each other by internally modifying surface energy with electrowetting. They borrow in form and... 
Paper Context: Scaling to smaller dimensions: Force, power, and efficiency Increasing the power density of microhydraulic actuators is straightforward: Decreasing droplet pitch and height reduces the droplet mass per width quadratically, whereas force per droplet width stays constant, at approximately the surface tension. This results in a quadratic increase in force density as dimensions are reduced. The actuation velocity stays roughly constant, because the increased force is counterbalanced by increased viscous losses.