What is the particle size range of SLN?

Could you please elaborate on the particle size range of Solid Lipid Nanoparticles (SLN)? Specifically, what is the typical range that researchers and manufacturers aim for in order to achieve optimal performance in terms of drug delivery, stability, and biocompatibility? Is there a standard range that is widely accepted in the industry, or does it vary depending on the specific application and intended use of the SLN? Furthermore, what factors influence the particle size distribution during the manufacturing process, and how can these factors be controlled to achieve the desired particle size range?