4.8 Article

Reactive Inkjet Printing of Functional Silk Stirrers for Enhanced Mixing and Sensing

期刊

SMALL
卷 15, 期 1, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201804213

关键词

enzymes; Marangoni effect; reactive inkjet printing; silk; stirrers

资金

  1. EPSRC [EP/N007174/1, EP/N023579/1, EP/J002402/1, EP/N033736/1, EP/J014850/1]
  2. Royal Society [RG160662]
  3. Jiangsu specially appointed professors program
  4. EPSRC [EP/N023579/1, EP/N007174/1, EP/J014850/1, EP/N033736/1, EP/J002402/1] Funding Source: UKRI

向作者/读者索取更多资源

Stirring small volumes of solution can reduce immunoassay readout time, homogenize cell cultures, and increase enzyme reactivity in bioreactors. However, at present many small scale stirring methods require external actuation, which can be cumbersome. To address this, here, reactive inkjet printing is shown to be able to produce autonomously rotating biocompatible silk-based microstirrers that can enhance fluid mixing. Rotary motion is generated either by release of a surface active agent (small molecular polyethylene glycol) resulting in Marangoni effect, or by catalytically powered bubble propulsion. The Marangoni driven devices do not require any chemicals to be added to the fluid as the fuel, while the catalytically powered devices are powered by decomposing substrate molecules in solution. A comparison of Marangoni effect and enzyme powered stirrers is made. Marangoni effect driven stirrers rotate up to 600 rpm, 75-100-fold faster than enzyme driven microstirrers, however enzyme powered stirrers show increased longevity. Further to stirring applications, the sensitivity of the motion generation mechanisms to fluid properties allows the rotating devices to also be exploited for sensing applications, for example, acting as motion sensors for water pollution.

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