PAPERmaking! g FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 2, Number 1, 2016
Fig. 4 TEM micrographs of TiO 2 nanoparticles of a anatase, b anatase + brookite c rutile phase structures. Inset in a represents general view of anatase spherical nanoparticles. Inset in c is a general view of rutile needle clusters. Dotted circles refer to individual single needlelike structures Figure 5 shows the nitrogen adsorption – desorption curves of the prepared TiO 2 nanopigments. In general, the results reveal that the isotherms can be classified according to the IUPAC as reversible type IV. Type IV materials are characterised by mesoporosity with high energy of adsorption p/p°. It also shows hysteresis loop of type H1 where the two branches are almost vertical and nearly parallel indicated by the slit-shaped pores for anatase and rutile particles. This also implies the presence of regular even pores without interconnecting channels. The anatase manifested the highest BET surface area which amounted to 140.74m 2 /g, pore diameter amounted to 18.33Å, and the total volume of pores was 0.237cc/g. A lower BET specific surface area was demonstrated by rutile, which amounted to 60.621m 2 /g. A decrease in diameter and volume of pores could also be noted, which amounted to 14.669Å and 0.122cc/g, respectively.
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Article 3 – Titanium Coating Pigments
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