Abstract: A tracer tool for tracking a state of a dissolvable downhole tool includes a medium dissolvable under downhole conditions, and at least one tracer material embedded in the medium, and releasable from the medium during dissolution of the medium. The tracer tool is mechanically separate from the dissolvable downhole tool.

Abstract: A piezoelectric device includes a piezoelectric film and a carbon-nanotube (CNT)-based electrode layer directly disposed on at least one side of the piezoelectric film. The CNT-based first electrode layer has a sheet resistance of less than 300 ohm/sq.

Abstract: A degradable adsorbent includes a porous degradable polymeric substrate, and nanoparticles bound to the porous degradable polymeric substrate. A method for removing an impurity from a fluid includes immersing a degradable adsorbent in the fluid containing the impurity, adsorbing the impurities in the degradable adsorbent, and disintegrating the degradable adsorbent in an aqueous solvent to produce a mixture containing the aqueous solvent, a degraded substrate and the impurity.

Abstract: A piezoelectric sensing module includes a polyvinylidene fluoride (PVDF) piezoelectric film, a first electrode layer that includes multiple receiver electrodes arranged in a first pattern enabling a sensing of a position of an input object on a touch surface using the PVDF piezoelectric film, and a second electrode layer that includes at least one common electrode. The PVDF piezoelectric film is arranged between the first electrode layer and the second electrode layer, with the second electrode layer between the PVDF piezoelectric film and the touch surface.