Contrasting nanoparticles diffusion in synthetic and biopolymer solutions

We investigated the dynamics of gold nanospheres (AuNS) and nanorods (AuNR) in synthetic polymer (polyethylene glycol) and biopolymer (bovine serum albumin and mucin) solutions. The variables are particle size and shape, polymer volume fraction, etc. The fluctuation correlation spectroscopy (FCS) was used to measure the translational (D$_{\mathrm{T}})$ and rotational diffusion (D$_{\mathrm{R}})$ of gold nanoparticles. Comparison will be made for the nano-viscosities at different length scales. The nanoparticle dynamics within the mucus gel will be presented.