2.2.3 Dynamic Light Scattering and Zeta Potential Measurements
The hydrodynamic diameter of the PDA-PAR30 particles was measured by dynamic light scattering (Malvern Nano ZS) in a backscattering configuration (θ=173°) and at a wavelength of 632.8 nm (HeNe laser). The intensity autocorrelation function obtained from a 1mL suspension (after dialysis) was analyzed with the Contin algorithm. The volume distribution as a function of the hydrodynamic diameter was obtained thereof using a refractive index of 1.73 ± 0.02i at the wavelength of the experiment. At least three measurements were realized for each sample.
Zeta potential measurements were performed using Nano-ZS device (Malvern Instruments, UK). At least three measurements were realized for each sample in order to compare zeta potential between PDA NPs and PDA-PAR30 NPs.