Emulsion Droplet Diameter The diameter of the dispersed water droplets in the emulsion was measured using a DT-100 acoustic spectrometer from Dispersion Technology Inc. The attenuation spectra were analyzed using Dispersion Technology software for polydisperse emulsions. The emulsions were formed as described for typical hBN composites, except no initiator or cross-linker was added. The sample was allowed to settle for 15 min before analysis.