Shear ordering in polymer photonic crystals

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...

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Bibliographic Details
Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2010-02, Vol.81 (2 Pt 1), p.020401-020401, Article 020401
Main Authors: Snoswell, D R E, Kontogeorgos, A, Baumberg, J J, Lord, T D, Mackley, M R, Spahn, P, Hellmann, G P
Format: Article
Language:English
Subjects:
Mechanical Phenomena
Nanocomposites - chemistry
Optical Phenomena
Photons
Polymers - chemistry
Temperature
Viscosity
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Summary: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.
ISSN:1539-3755
1550-2376
DOI:10.1103/PhysRevE.81.020401