TY - JOUR
T1 - Nanoparticle diffusion in methycellulose thermoreversible association polymer
AU - Jee, Ah Young
AU - Curtis-Fisk, Jaime L.
AU - Granick, Steve
N1 - Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2014/8/26
Y1 - 2014/8/26
N2 - Solutions of aqueous methylcellulose, a hydrophobically modified polymer (molecular weight â‰̂270 kg/mol, methyl content â‰̂30%), are mixed with either dilute coumarin fluorescent dye or carboxylated latex (20 nm diameter), and the tracer diffusion is contrasted as a function of temperature and polymer concentration (from dilute to 36 times the overlap concentration) in deionized water. From two-photon fluorescence correlation spectroscopy (FCS), mean-square displacement is inferred. At room temperature, which is the fluid state, we observe Fickian diffusion provided that the tracer particle size is less than the polymer mesh size, whereas tighter meshes produce subdiffusion followed by Fickian diffusion at long times. At elevated temperature, which is the gel state, subdiffusion is observed over the entire experimental time window. To quantify subdiffusion, the data are described equally well as two discrete relaxations or a stretched exponential, and the former is analyzed in detail as it is considered to be more meaningful physically. These measurements allow us to discuss the structure and degree of inhomogeneity of methylcellulose in the gel state. This industrially relevant polymer produces simple, physically meaningful diffusion patterns that we find to be repeatable, obeying systematic patterns described quantitatively in this paper.
AB - Solutions of aqueous methylcellulose, a hydrophobically modified polymer (molecular weight â‰̂270 kg/mol, methyl content â‰̂30%), are mixed with either dilute coumarin fluorescent dye or carboxylated latex (20 nm diameter), and the tracer diffusion is contrasted as a function of temperature and polymer concentration (from dilute to 36 times the overlap concentration) in deionized water. From two-photon fluorescence correlation spectroscopy (FCS), mean-square displacement is inferred. At room temperature, which is the fluid state, we observe Fickian diffusion provided that the tracer particle size is less than the polymer mesh size, whereas tighter meshes produce subdiffusion followed by Fickian diffusion at long times. At elevated temperature, which is the gel state, subdiffusion is observed over the entire experimental time window. To quantify subdiffusion, the data are described equally well as two discrete relaxations or a stretched exponential, and the former is analyzed in detail as it is considered to be more meaningful physically. These measurements allow us to discuss the structure and degree of inhomogeneity of methylcellulose in the gel state. This industrially relevant polymer produces simple, physically meaningful diffusion patterns that we find to be repeatable, obeying systematic patterns described quantitatively in this paper.
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U2 - 10.1021/ma501331z
DO - 10.1021/ma501331z
M3 - Article
AN - SCOPUS:84906693608
SN - 0024-9297
VL - 47
SP - 5793
EP - 5797
JO - Macromolecules
JF - Macromolecules
IS - 16
ER -