| 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 is a nanoparticle comprising an oxide of Sr, Ba, Y, La, Ti, Zr, Hf, Nb or Ta, wherein the nanoparticle has a weight average diameter of 1 to 30 nm, The invention relates to nanoparticles, wherein the organic compound of the general formula (I), (II) or (III) or an organic compound containing at least two carboxylic acid groups is present on the surface of the nanoparticle. Wherein a is 0 to 5, b and c are independently 1 to 14, n is 1 to 5, and f is 0 to 5. , P and q are each independently 1 to 14, and e and f are each independently 0 to 12.) |