期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 113, 期 11, 页码 3355-3359出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp809707y
关键词
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资金
- International Max Planck Research School (IMPRS)
We employed fluorescence correlation spectroscopy (FCS) to study the diffusion of molecular and macromolecular tracers in polystyrene solutions over a broad range of concentrations (c) and molecular weights (M-w,M-m) of the matrix polymer. Molecular tracer diffusion scales only with the matrix concentration and superimposes on a single, nonpolymer specific, curve. On the contrary, the diffusion of macromolecular tracers in solutions of matrix polymers with M-w,M-m sufficiently larger than the tracer molecular weight scales with c/c(p)*, where c(p)* is the tracer overlap concentration. We further demonstrate that FCS can address local and global dynamics simultaneously.
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