Patent ID: 9566604
Date: 2017-02-14
CPC Classifications: B05D,B82Y,C12Q,G01N,Y10S,Y10T

Claim:
1. A method for preparing a continuous gradient of deposited and electrically charged nanoparticles along a solid surface, comprising: immersing the solid surface into a solution comprising electrically charged nanoparticles; diffusing a salt solution into the solution comprising the electrically charged nanoparticles and the solid surface, the salt solution diffusing along the solid surface and creating a salt concentration gradient in the solution comprising the electrically charged nanoparticles; and depositing the electrically charged nanoparticles on the solid surface; wherein the density of electrically charged nanoparticles that are deposited on the solid surface forms a gradient as a result of the salt concentration gradient; and wherein the distance between the electrically charged nanoparticles is regulated through controlling electrostatic repulsion amongst the electrically charged nanoparticles.