The use of chemical or precise surface area to achieve colloidal nanoparticle surface patterning more and more attention, in the medical diagnosis, imaging, sensing and colloidal nanoparticle assembly, stability and other areas of research are of great significance!
Micron and sub-micron grade patch-type colloidal particles are now very common, the difficulty is: size in the tens of nanometer scale interval of inorganic colloidal nanoparticle surface pattern! Nano-particles with excellent optical and electromagnetic properties, these properties are subject to size, shape of the decision. Moreover, the new assembly may produce new properties. At present, the surface pattern of nanoparticles has little effect.
The researchers dispersed mercapto-terminated polystyrene-modified Au nanoparticles in DMF. Since DMF was a good solvent for PS molecules, the polystyrene molecules appeared as regular brush-type arrays. Then, water is added to the DMF solvent. As the solvent dissolution quality deteriorates, the mercapto polystyrene molecules on the surface of the Au nanoparticles form a micelles fixed on the surface from a regular brush-type array (mercapto ensures that the polymer Close to the Au surface, and the poor solubility leads to isolation into multiple sheet micelles). After optical crosslinking, the patch can be permanently retained on the nanoparticle surface.
Consistent with the theoretical calculation, this method can actually regulate the size, spatial distribution and number of surface patches of each nanoparticle. In the Au nanoparticle surface modification of a variety of different sizes, shapes and composition of the patch, can achieve different types of polymer bolt together, by different external stimulus response.
In summary, this patch-type Colloidal Particle for the colloidal nanotechnology to promote the overall study has a good reference!