期刊
JOURNAL OF CHEMICAL PHYSICS
卷 140, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4884024
关键词
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资金
- European Community through DAAD [PIRSES-GA-2011-295302]
- St. Petersburg State University of the Deutsche Forschungsgemeinschaft [Bl 142/11-1]
- Fonds der Chemischen Industrie
We study the orientational properties of labeled segments in semiflexible dendrimers making use of the viscoelastic approach of Dolgushev and Blumen [J. Chem. Phys. 131, 044905 (2009)]. We focus on the segmental orientational autocorrelation functions (ACFs), which are fundamental for the frequency-dependent spin-lattice relaxation times T-1(omega). We show that semiflexibility leads to an increase of the contribution of large-scale motions to the ACF. This fact influences the position of the maxima of the [1/T-1]-functions. Thus, going from outer to inner segments, the maxima shift to lower frequencies. Remarkably, this feature is not obtained in the classical bead-spring model of flexible dendrimers, although many experiments on dendrimers manifest such a behavior. (C) 2014 AIP Publishing LLC.
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