title: Anomalous diffusion of poly(ethylene oxide) in agarose gels.
abstract: We report on the effect of probe size and diffusion time of poly(ethylene) oxide in agarose gels. Time-dependence of the diffusion coefficient, reflecting anomalous diffusion, was observed for poly(ethylene) oxide chains with hydrodynamic radii exceeding about 20nm at an agarose concentration of 2%. The main conclusion is that the pore distribution includes pores that are only several nm across, in agreement with scattering reports in the literature. Interpretation of the diffusion coefficient dependence on the probe size based on a model of entangled rigid rods yielded a rod length of 72nm.
authors: Graduate School of Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-Ku, Tokyo 108-8477, Japan; Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyoda, Tokyo 102-8554, Japan.
authors: Tom
authors: T
authors: Brenner
authors: Graduate School of Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-Ku, Tokyo 108-8477, Japan. Electronic address: matsukaw@kaiyodai.ac.
authors: Shingo
authors: S
authors: Matsukawa
mesh_terms: D004058:Diffusion; D005782:Gels; D007700:Kinetics; D008956:Models, Chemical; D011092:Polyethylene Glycols / Q000737:chemistry*; D012212:Rheology; D012685:Sepharose / Q000737:chemistry*
chemical_list: D005782:Gels; D011092:Polyethylene Glycols; D012685:Sepharose
keywords: Anomalous diffusion; Gel permeability; Pore size; Tracer diffusion