Patent ID: 7825283

Claim:
A nanoparticle comprising a chain oligomer section having a hydrophilic group and fluoroalkyl groups respectively at its opposite terminals, a three-dimensional silica network section, and an organic chain having fluorine or silicon, and has a structure represented by the following formula (1): where R′ is independent H or independent alkyl group; X is the hydrophilic group and is selected from the group consisting of an OH group, an NCO group, an NH 2 group, an NHR group (where R is alkyl group) and a COY group (where Y is hydrophilic group); R F is the fluoroalkyl group having a carbon number of 2 to 10 and a molecular weight of 119 to 1000; 3D-SN is the three-dimensional silica network section; B is selected from the group consisting of an O, O═C—O, NH—C═O and NR—C═O (where R is alkyl group); E is O, O═C—O, NH—C═O or NR—C═O (where R is alkyl group); G is [(CH 2 O) 1 —[Si(CH 3 ) 2 O] k —(CH 2 O) 1 ], (CF 2 ) j or (CF 2 O) h ); n is 1≦n≦10; m is 1≦m≦n; k is 1≦k≦500; 1 is 0≦1≦10; j is 0≦j≦20; and h is 1≦h≦20.