2D-STEM micrograph of a dry acrylonitrile-butadiene-styrene (ABS) latex is observed in the left image. ABS latex with 36 % of solid content was synthetized by seeded semi-batch emulsion polymerization. For the sample preparation, the ABS latex was first dialyzed to remove adsorbed species on the surface of the particles, mainly to avoid staining of the surfactant used during the grafting reaction. Then, the polymer latex was dried on a Transmission Electron Microscopy (TEM) grid and stained with OsO4 for one hour, which selectively reacted with the vinylic bonds of the PB. In HAADF-STEM, the contrast of the image is opposite to common TEM micrographs, which means that the PB matrix phase stained with OsO4 will correspond to the bright area while the SAN phases (shell and clusters) to the dark. The image presents the 2D-STEM tomographic image at position OZ = 124 of the particle, where the OZ axis coincides with the direction of the electron beam, and the OY axis is the tilting axis. 

Micrografía SEM a 1.467X de magnitud, con un HV de 10.00kV (WD: 10.6 mm). Fractura de una película polimérica compuesta de metacrilatos (MMA/BA/HEMA) en precencia de nanotubos de carbono multipared (0.5%) mediante polimerización en miniemulsión. Los nanotubos previos a la polimerización fueros sometidos a un tratamiento de ultrasonido en agua y en presencia de polyvinilpirrolidona. Después de la polimerización a 70ºC, el látex obtenido fue de color negro y homógeno sin cuágulos y estable.