4.4.3. Colloidal Stability of MSN-PEI Suspensions The 1 and 5 mg/mL MSN-PEI suspensions were irradiated in the near infrared region (air = 850 nm) with an electroluminescent diode using multiple light scattering (MLS, Turbiscan MA2000, FormulAction, Tolouse, France) to evaluate the colloidal...