Shear ordering in polymer photonic crystals

被引：34
|
作者：
Snoswell, D. R. E. [1 ]
Kontogeorgos, A. [1 ]
Baumberg, J. J. [1 ]
Lord, T. D. [2 ]
Mackley, M. R. [2 ]
Spahn, P. [3 ]
Hellmann, G. P. [3 ]
机构：
[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
[2] Univ Cambridge, Dept Chem Engn & Biotechnol, Cambridge CB3 0HE, England
[3] DKI, D-64289 Darmstadt, Germany
来源：
PHYSICAL REVIEW E | 2010年 / 81卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
COLLOIDAL CRYSTALS; CRYSTALLIZATION; SUSPENSIONS; RHEOLOGY; BEHAVIOR; SPHERES;
D O I：
10.1103/PhysRevE.81.020401
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Optical scattering spectra are recorded in situ on flowing colloidal polymeric nanocomposites which are sheared into photonic crystals at 150 degrees C using a high-pressure quartz-cell multipass rheometer. Broadband spectroscopy of the resonant Bragg scattering peak allows the direct observation of crystal formation and melting of monodisperse core-shell particles. A range of flow conditions of this solventless, highly viscous melt reveals four distinct regimes of crystal growth and decay which match a simple rheological model. Extraction of crystal thickness, order and lattice spacing are validated by one-dimensional electromagnetic simulations.
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页数：4
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