Uniformization of silica particles by theory directed rate-zonal centrifugation to build high quality photonic crystals

	Uniformization of silica particles by theory directed rate-zonal centrifugation to build high quality photonic crystals
	Hu, Can; Chen, Yi
刊名	CHEMICAL ENGINEERING JOURNAL
	2015-07-01
卷号	271 页码:128-134
关键词	Particle uniformization Density gradient centrifugation Theoretical guidance Photonic crystal
英文摘要	Non-uniform size distribution can be observed in the synthesis of nanoparticles. There is thus a compelling need for post-synthesis separation of nanoparticles. Herein, a theory directed rate-zonal centrifugation method was proposed to unify the as-synthesized silica spheres. A formula that quantitatively links the centrifugal time with centrifugal conditions was derived. Under the guidance of the formula, various silica particles with size from 80 nm up to 5 mu m were successfully uniformed and/or separated in ca. 1 min by centrifugation. The polydispersity index improved largely, e.g., from 0.116, 0.084, 0.071 and 0.102 to 0.013, 0.007, 0.006 and 0.009 for 80 nm, 260 nm, 740 nm and 5 mu m silica particles, respectively. The separation time and efficiency were easily adjusted by regulating the centrifugal speed, gradient formulation and fractionation size. With the uniformed particles, better photonic crystals (PCs) were assembled, with stopband width largely sharpened, e.g., from 66 nm to 16 nm for a 260-nm-silica-assembled PC, and stopband reflectivity extensively enhanced from 75% up to even 99%. This method can also be extended to unify other spherical particles. (C) 2015 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/28645]
专题	化学研究所_活体分析化学实验室
作者单位	Chinese Acad Sci, Inst Chem, Key Lab Analyt Chem Living Biosyst, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Hu, Can,Chen, Yi. Uniformization of silica particles by theory directed rate-zonal centrifugation to build high quality photonic crystals[J]. CHEMICAL ENGINEERING JOURNAL,2015,271:128-134.
APA	Hu, Can,&Chen, Yi.(2015).Uniformization of silica particles by theory directed rate-zonal centrifugation to build high quality photonic crystals.CHEMICAL ENGINEERING JOURNAL,271,128-134.
MLA	Hu, Can,et al."Uniformization of silica particles by theory directed rate-zonal centrifugation to build high quality photonic crystals".CHEMICAL ENGINEERING JOURNAL 271(2015):128-134.