纳米流体
纳米颗粒
材料科学
拉曼光谱
拉曼散射
结晶度
化学工程
纳米技术
Zeta电位
化学物理
化学
复合材料
光学
物理
工程类
作者
Zehui Zhang,Bin Zhou,Mingtao Jia,Chunyan Wu,Tingting Niu,Feng Chen,Hongqiang Wang,Yanfeng Liu,Jialu Lu,Zhihua Zhang,Jun Shen,Ai Du
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2023-09-15
卷期号:9 (37)
被引量:2
标识
DOI:10.1126/sciadv.adi9108
摘要
Normally, stirring is regarded as a technology to disperse the substances in liquid evenly. However, Einstein's tea leaf paradox (ETLP) describes the phenomenon that tea leaves concentrate in a "doughnut" shape via a secondary flow effect while stirring. Herein, to demonstrate ETLP-induced concentration in nanofluid, we simulated the nanoparticle trajectory under stirring and made a grayscale analysis of SiO2 nanofluids during stirring and standing processes. Unexpectedly, a localized concentration effect in the layer flow was found beside the macroscopic ETLP effect. Subsequently, the localized concentration was applied to achieve the ultrafast aggregation of Au nanoparticles to form gold aerogels (GAs). The skeleton size of GAs was adjusted from about 10 to 200 nm by only adjusting the temperature of HAuCl4 solution. The fabricated GAs had extremely high purity and crystallinity, revealing potential applications in photocatalysis and surface-enhanced Raman scattering.
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