Morphology nanometric domain

In this work, nanocomposite supports formed by nanometric domains of alumina dispersed on a-Al203 beads were synthesized by a modified incipient wetness impregnation method in order to improve specific surface area and surface reactivily of a-Al203 large porosity precursor. The obtained composites were characterized by conventional physical methods like N2 adsorption-desorption, mercury porosimetry, TEM and SEM, in order to describe the evolution of the composite textural properties with the impregnated phase morphology. 

The nascent powder sample has quite a different morphology compared to the solution-crystallised or melt-crystallised samples. The nascent powder morphology mainly consists of particles connected by fibrils, which is called the "cobweb" structure.26 27 The nascent powder does not have any typical lamellar morphology but has a domain structure where crystalline domains distribute within the whole powder globule (Figure 3C). The domain size has a wide range of several tens of nanometres radius. 

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