期刊
PHYSICAL REVIEW LETTERS
卷 93, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.206103
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Spreading of a polymer drop on a solid substrate was monitored with molecular resolution. Three characteristic rates, i.e., the spreading rate of the precursor film D-spread=(3.9+/-0.2)x10(3) nm(2)/s, the flow-induced diffusion rate of molecules within the film D-induced=1.3+/-0.1 nm(2)/s, and the thermal diffusion coefficient of single molecules D(therm)less than or equal to0.10+/-0.03 nm(2)/s, were independently measured. Since D-spread>D-induced, the plug flow of polymer chains was identified as the main mass-transport mechanism of spreading with an insignificant contribution from the molecular diffusion.
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