Diffusion of Nanoparticles in Entangled Poly(vinyl
alcohol) Solutions and Gels
Posted on 2019-01-11 - 20:14
We studied the diffusion of gold
nanoparticles within entangled solutions and gels formed by high molecular
weight (Mw = 89000 g/mol) poly(vinyl alcohol)
(PVA) in water by using fluctuation correlation spectroscopy (FCS).
The nanoparticle size (2R) was varied between 5 and
30 nm, and the PVA volume fraction (ϕ) was chosen to be in the
entangled regime. We found that existing hydrodynamic and obstruction
models are inadequate to describe the size dependence of the particle
diffusion coefficient (D). For size ratios x = 2R/ae ≈
0.5–2.5, where ae is the entanglement
tube diameter in the solution, our results suggest a functional form
for D ∼ exp(−κx), where κ ≈ 1.4. This result qualitatively agrees with
the scaling theory prediction of hopping motion for particles within
entangled polymer solutions. For larger particles at higher volume
fractions, an additional sharp slowing down of the particle motion
was observed, which also exhibited an exponential dependence on the
size ratio, but with a much higher value of κ ≈ 7.5.
Such a rare hopping process can be explained qualitatively by recently
developed force-based nonlinear Langevin theory.
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Senanayake, Kavindya K.; Fakhrabadi, Ehsan Akbari; Liberatore, Matthew W.; Mukhopadhyay, Ashis (2019). Diffusion of Nanoparticles in Entangled Poly(vinyl
alcohol) Solutions and Gels. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.8b01917
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AUTHORS (4)
KS
Kavindya K. Senanayake
EF
Ehsan Akbari Fakhrabadi
ML
Matthew W. Liberatore
AM
Ashis Mukhopadhyay