In this study, we have examined a crystallization effect of colloidal dispersion induced by the various elongational flows. Extremely strong electrostatic repulsion makes a crystal structure called ‘colloid crystal’. A colloid crystal has hundreds of nano-meters in grating scale and it reflects the visible light due to the Bragg diffraction. It has the potential to become different photonic devices such as an inexpensive photonic device and a planar laser source, but it requires the evolution of the process of making a single-crystal with external stimulus. The methods using flow operation described in this study are expected to the crystallization action of a colloidal dispersion. In the experiment, 2 types of the flow have been examined. The flows have a contraction or an expansion part between two parallel plates separated by 0.1 mm gap and it cause deformations of a contraction or an extension for the colloid. We have evaluated the crystallization effects by a spectroscopic observation of visible-lights reflection on the flow region. As a result, while expansion flows have no crystallization effect, contraction flows have shown it.
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ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
July 24–29, 2011
Hamamatsu, Japan
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4440-3
PROCEEDINGS PAPER
Flow Induced Crystallization of Colloidal Dispersion Available to Purchase
Shinji Toga,
Shinji Toga
Toyama National College of Technology, Imizu, Toyama, Japan
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Takatsune Narumi
Takatsune Narumi
Niigata University, Niigata, Niigata, Japan
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Shinji Toga
Toyama National College of Technology, Imizu, Toyama, Japan
Takatsune Narumi
Niigata University, Niigata, Niigata, Japan
Paper No:
AJK2011-14021, pp. 3363-3368; 6 pages
Published Online:
May 25, 2012
Citation
Toga, S, & Narumi, T. "Flow Induced Crystallization of Colloidal Dispersion." Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D. Hamamatsu, Japan. July 24–29, 2011. pp. 3363-3368. ASME. https://doi.org/10.1115/AJK2011-14021
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