The "Music" of Core-Shell Spheres and Hollow Capsules: Influence of the Architecture on the Mechanical Properties at the Nanoscale

被引：48
作者：
Still, T. [1 ]
Sainidou, R. [2 ]
Retsch, M. [1 ]
Jonas, U. [1 ,3 ]
Spahn, P. [4 ]
Hellmann, G. P. [4 ]
Fytas, G. [1 ,3 ]
机构：
[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
[2] CSIC, Inst Opt, E-28006 Madrid, Spain
[3] FORTH, Dept Mat Sci, Iraklion 71110, Greece
[4] Deutsch Kunststoff Inst Darmstadt, D-64289 Darmstadt, Germany
来源：
NANO LETTERS | 2008年 / 8卷 / 10期
关键词：
D O I：
10.1021/nl801500n
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We report on the first measurement of elastic vibrational modes in core-shell spheres (silica-poly(methyl methacrylate), SiO2-PMMA) and corresponding spherical hollow capsules (PMMA) with different particle size and shell thickness using Brillouin light scattering, supported by numerical calculations. These localized modes allow access to the mechanical moduli down to a few tens of nanometers. We observe reduced mechanical strength of the porous silica core, and for the core-shell spheres a striking increase of the moduli in both the SiO2 core and the PMMA shell. The peculiar behavior of the vibrational modes in the hollow capsules is attributed to antagonistic dependence on overall size and layer thickness in agreement with theoretical predictions.
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收藏
页码：3194 / 3199
页数：6
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