Static micromixers for modular chip reactor arrangements in two-step reactions and photochemical activated processes

Kirner, T.; Albert, Jens; Günther, M.; Mayer, Günter; Reinhäckel, K; Köhler, J. Michael

doi:10.1016/j.cej.2003.10.029

Cited by 40 publications

(18 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1) was composed of four PCcontrolled syringe pumps delivering the fluids at a constant flow rate, a static micro-static micro-mixer (Statmix 6, IPHT Jena [42]) used for mixing of reactants, an injector for segment formation and PTFE tube coil placed inside a thermostat allowing the application of temperatures up to 150 • C. A micro-flow-through photometer (LED peak at 610 nm, Agilent, Santa Clara CA, United States) mounted between the injector and thermostat was applied to detect the segments.…”

Section: Experimental Arrangement and Devicesmentioning

confidence: 99%

Effect of water content on growth and optical properties of ZnO nanoparticles generated in binary solvent mixtures by micro-continuous flow synthesis

Meierott

Köhler

2010

Chemical Engineering Journal

View full text Add to dashboard Cite

Section: Experimental Arrangement and Devicesmentioning

confidence: 99%

Effect of water content on growth and optical properties of ZnO nanoparticles generated in binary solvent mixtures by micro-continuous flow synthesis

Meierott

Köhler

2010

Chemical Engineering Journal

View full text Add to dashboard Cite

“…A three chip sandwich technology including two glass chips at the bottom and the top and a silicon chip between them was applied in order to get a good splitting and reshaping behavior at the fluid stream. The construction and preparation technology of the micro mixer class was described previously [39]. …”

Section: Methodsmentioning

confidence: 99%

Formation and Fluorimetric Characterization of Micelles in a Micro-flow Through System with Static Micro Mixer

Schuch

Groß

Köhler

2007

Sensors

View full text Add to dashboard Cite

The formation and behaviour of micelles of sodium dodecylsulfate in water by use of a static micro mixer were studied. Trisbipyridylruthenium(II) was applied as indicator dye, 9-methylanthracene was used for fluorescence quenching. All experiments were carried out by a micro fluid arrangement with three syringe pumps, a 2+1 two-step static micro mixer (IPHT Jena) and a on-line micro fluorimetry including a luminescence diode for excitation, a blue glass filter (BG 7, Linos), two edge filters (RG 630, Linos) and a photo counting module (MP 900, Perkin Elmer). It was possible to measure the fluorescence inside the PTFE tube (inner diameter 0.5 mm) directly. A linear dependence of fluorescence intensity from dye concentration was observed in absence of quencher and surfactant as expected. An aggregation number of about 62 was found in the flow rate range between 300 and 800 μL/min. The fluorescence intensity increases slightly, but significant with increasing flow rate, if no quencher is present. In the presence of quencher, the fluorescence intensity decreases with decreasing surfactant concentration and with enhanced flow rate. The strength of the flow rate effect on the fluorescence increases with decreasing surfactant concentration. The size of micelles was determined in micro channels by the micro fluorimetric method in analogy to the conventional system. The micelles extract the quencher from the solution and lower, this way, the quenching effect. The size of micelles was estimated and it could be shown, that the flow rate has only low effect on the aggregation number at the investigated flow rates. The effect of flow rate and surfactant concentration on the fluorescence in the presence of quencher was interpreted as a shift in the micelle concentration due to the shear forces. It is expected, that the fluorescence intensity is lowered, if more quencher molecules are molecular disperse distributed inside the solution. Obviously, the lowered fluorescence intensity at higher flow rates suggests a reduction of the micelle density causing an increase of quencher concentration outside the micelles.

show abstract

“…The channel depth and width are about 0.2 mm and 0.4 mm, respectively. The microchannels generated by anodic bonding of the micropatterned substrates are forming a static micromixer of the split-and-recombine type with eight microchannel units for separation, reshaping, and reunification of liquid flow [25,26].…”

Section: Methodsmentioning

confidence: 99%

Continuous-Microflow Synthesis and Morphological Characterization of Multiscale Composite Materials Based on Polymer Microparticles and Inorganic Nanoparticles

Kraus¹,

Li²,

Knauer³

et al. 2014

J Flow Chem

View full text Add to dashboard Cite

This paper presents a new route to the synthesis of uniform and size-controlled inorganic/organic composite microparticles by means of microreaction technology. Au-nanoparticles in the range of 3 to 14 nm are synthesized by reduction of tetrachloroauric acid, while ZnO-nanoparticles (200-2000 nm) are synthesized in a continuous-flow twostep process using microtube arrangements for microsegmented flow. Both inorganic nanoparticles have a wellcontrolled size and narrow size distribution. Upon surface modification, the nanoparticles are then mixed on one hand with an acrylate-based monomer and, on the other hand, with an aqueous solution of acrylamide. Both solutions were then emulsified into uniform core-shell droplets by means of a capillary-based microfluidic device. Droplet's shell was hardened through UV-induced polymerization, whereas the core led to a hydrogel upon thermal-induced polymerization. Core-shell polymer microparticles (200-300 µm) with inorganic nanoparticles selectively incorporated into the core and the shell are thus obtained as proven by extensive morphological characterizations using electronic and optical microscopies.

show abstract

Static micromixers for modular chip reactor arrangements in two-step reactions and photochemical activated processes

Cited by 40 publications

References 9 publications

Effect of water content on growth and optical properties of ZnO nanoparticles generated in binary solvent mixtures by micro-continuous flow synthesis

Effect of water content on growth and optical properties of ZnO nanoparticles generated in binary solvent mixtures by micro-continuous flow synthesis

Formation and Fluorimetric Characterization of Micelles in a Micro-flow Through System with Static Micro Mixer

Continuous-Microflow Synthesis and Morphological Characterization of Multiscale Composite Materials Based on Polymer Microparticles and Inorganic Nanoparticles

Contact Info

Product

Resources

About