Usually, Cold Spray (CS) is used for deposition of particles with size 0.5-100 um. Nano-particles are not deposited well by CS because they are very easy loosing the velocity in bow shock area inside stagnation bubble close to surface of support. If you want to increase the adhesion of nano-particles to Al support you need to use special nozzle (which eliminate bow shock) and combine CS with electrostatic techniques.