Improvement of the Centrifugal Force in Gravity Driven Method for the Fabrication of Highly Ordered and Submillimeter-Thick Colloidal Crystal

In this paper, we propose a modified gravity method by introducing centrifugal force to promote the stacking of silica particles and the order of formed colloidal crystals. In this method, a monodispersed silica colloidal solution is filled into empty cells and placed onto rotation arms that are des...

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Bibliographic Details
Published in:Polymers 2021-02, Vol.13 (5), p.692
Main Authors: Chen, Ting-Hui, Huang, Shuan-Yu, Huang, Syuan-Yi, Lin, Jia-De, Huang, Bing-Yau, Kuo, Chie-Tong
Format: Article
Language:English
Subjects:
Centrifugal force
Colloiding
Crystal defects
Crystal structure
Crystals
Experiments
Glass substrates
Gravitation
Methods
Particle size
Reflectance
Silicon dioxide
Stacking
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Summary:In this paper, we propose a modified gravity method by introducing centrifugal force to promote the stacking of silica particles and the order of formed colloidal crystals. In this method, a monodispersed silica colloidal solution is filled into empty cells and placed onto rotation arms that are designed to apply an external centrifugal force to the filled silica solution. When sample fabrication is in progress, silica particles are forced toward the edges of the cells. The number of defects in the colloidal crystal decreases and the structural order increases during this process. The highest reflectivity and structural order of a sample was obtained when the external centrifugal force was 18 G. Compared to the samples prepared using the conventional stacking method, samples fabricated with centrifugal force possess higher reflectivity and structural order. The reflectivity increases from 68% to 90%, with an increase in centrifugal force from 0 to 18 G.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13050692