FESEM photomicrographs of a) oven dried slaked lime putty showing agglomeration of platelike Ca(OH)₂nanocrystals, and b) commercial dry hydrated lime also displaying extensive agglomeration. In both a) and b), randomly oriented and crystallographically oriented aggregates are present. Details of representative oriented aggregate of Ca(OH)₂ nanoparticles attached by the (0001) planes are seen in c) and randomly oriented aggregates in freeze-dried slaked lime particles are seen in d). Photo: Carlos Navarro-Rodriguez.