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  A droplet-based microfluidic scheme for complex chemical reactions

Chokkalingam, V. (2010). A droplet-based microfluidic scheme for complex chemical reactions. PhD Thesis, Universität des Saarlandes, Saarbrücken.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-C3BA-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-C3BB-8
Genre: Thesis

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 Creators:
Chokkalingam, Venkatachalam1, Author              
Affiliations:
1Group Geometry of Fluid Interfaces, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063311              

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 Abstract: In the present work, a novel droplet-based microfluidic scheme is developed to perform chemical reactions. The chemical reactants are dispensed with precise volume control into pairs of droplets produced via step-emulsification. The reaction is activated by merging the pairs of droplets by a geometrical constriction and fast mixing inside the merged droplets. Furthermore, the post-processing of the chemical products is also included within the microfluidic device. This microfluidic reaction scheme allows performing precisely volume controlled reactions with long and stable operation conditions without any clogging even if precipitates or sticky gels are formed during the reaction. We demonstrate the potential of our microfluidic scheme by producing mesoporous silica particles from a rapid gelation optimized sol-gel synthesis route. The produced silica particles have a superior surface area of about 820 m2 g −1 and a narrow pore radius distribution around 2.4 nm. This microfluidic scheme is quite universal and therefore, only the chemical recipe needed slight modifications to produce platinum doped silica catalysts with superior catalytic behavior than commercially available catalysts.

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Language(s): eng - English
 Dates: 2010-12-15
 Publication Status: Accepted / In Press
 Pages: -
 Publishing info: Saarbrücken : Universität des Saarlandes
 Table of Contents: -
 Rev. Method: -
 Degree: PhD

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