| abstract |
The present invention is in the field of nanoparticles, their preparation and their use as pinning centers in superconductors. In particular, the present invention relates to nanoparticles comprising oxides of Sr, Ba, Y, La, Ti, Zr, Hf, Nb or Ta, wherein the nanoparticles have a weight average diameter of 1-30 nm, and wherein the nanoparticles are An organic compound of general formula (I), (II) or (III) or an organic compound comprising at least two carboxylic acid groups is present on its surface, wherein a is 0-5, and b and c are independently of each other 1-14 , n is 1-5, f is 0-5, p and q are 1-14 independently of each other, e and f are 0-12 independently of each other. |