| 摘要 |
<p>PCT No. PCT/EP96/01756 Sec. 371 Date Oct. 29, 1997 Sec. 102(e) Date Oct. 29, 1997 PCT Filed Apr. 26, 1996 PCT Pub. No. WO96/34829 PCT Pub. Date Nov. 7, 1996A description is given of a process for producing weakly agglomerated, densified and/or crystallized nanosize particles which is characterized in that either (a) a suspension containing amorphous or partially crystalline nanosize particles is produced in a conventional manner from precursors for the nanosize particles, where the nanosize particles are produced in a solvent which has no solvent capability, or only a low solvent capability, for the particles and in the presence of at least one surface-blocking substance, or (b) an already formed powder comprising amorphous or partially crystalline nanosize particles is suspended in the solvent specified under (a) in the presence of the surface-blocking substance or substances specified under (a), or (c) a sol containing amorphous or partially crystalline nanosize particles is suspended in the solvent specified under (a) in the presence of the surface-blocking substance or substances specified under (a); and the suspension thus produced is subjected to conditions which lead to a densification and/or crystallization of the nanosize particles.</p> |
