Microcapillary films

Plastic microcapillary flow disk (MFD) reactors have been constructed from a flexible, plastic microcapillary film (MCF), comprising parallel capillary channels with diameters in the range of 80-250 jxm. MCFs are wound into spirals and heat treated to form solid disks. These reactors are capable of carrying out continuous flow reactions at elevated temperatures and pressures with a controlled residence time. ... 

DeMello et al. reported the use of a microcapillary film (MCF) reactor for the aerobic oxidation of a-terpinene to ascaridole [45]. The MCF was manufactured... 

S. Bonyadi, M. Mackley, The development of novel microcapillary film membranes. Journal of Membrane Science 389 (2012) 137-147. 

The disc-shaped plastic micoreactors, termed microcapillary films (MCFs), contain 19 parallel microchannels, each with a mean internal diameter of 142 10 pm. The material was prepared using a melt extrusion process from an ethylene-vinyl alcohol copolymer (EVOH) [28]. Immobilization of palladium(0) on the wall surface inside the MCFs was performed by simple chemical deposition techniques (Scheme 7.3). The palladium-coated capillaries were used for transfer hydrt enation of ketones, imines, nitro compounds, alkenes, and alkynes with triethylsilane under flow conditions [29]. Microcapillaries whose inside surfaces were coated with copper or gold were also utilized for the continuous-flow reactions [30]. 

The thin cylindrical gel was placed in a sealed glass microcapillary of inner diameter of 1.35 mm. As is illustrated in Fig. 2, the capillary was encapsulated in a transparent cell, within which water was circulated to control the temperature. The glass microcapillary with the thin film gel was directly encapsulated in the cell. The temperature was regulated within + 0.05 °C. On the other hand, the film gel with glass plate was directly encapsulated in the transparent cell shown in Fig. 2. In both cases, the temperature of gels was not directly measured, but was obtained by measuring the difference between the circulated water temperature and the temperature of the places where gels were set in. 

Acetylcholineesterase and choline oxidase A glassy C electrode surface was modified with osmium poly (vinyl-pyridine) redox polymer containing horseradish peroxidase (Os-gel-HRP) and then coated with a co-immobilized layer of AChE and ChO. A 22 pL pre-reactor, in which ChO and catalase were immobilized on beads in series, was used to remove choline. The variation in extracellular concentration of ACh released from rat hippocampal tissue culture by electrical stimulation was observed continuously with the online biosensor combined with a microcapillary sampling probe. Measurement of ACh and Ch was carried out by using a split disc C film dual electrode. 

Deryaguin, B. V. (1964). Recent research into the properties of water in thin films and in microcapillaries. In The State and Movement of Water in Living Organisms XlXth Symposium of Society for Experimental Biology, pp. 55-60, Cambridge University Press. 

Therefore the primary goal is to force the bubbles to move inside the microcapillaries, pushing out the oil and dragging the oil film that covers the capillary walls down the capillary. This problem is similar to the problem of motion of a long (but finite) bubble inside a capillary filled with viscous liquid that was already mentioned in Section 17.3 (see Fig. 17.7). The difference is that it is neces-... 

Horak, J., Dincer, C., Bakirci, H., Urban, G., 2014. A disposable dry film photoresist-based microcapillary immunosensor chip for rapid detection of Epstein-Barr virus infection. Sensors and Actuators B Chemical 191, 813-820. 

Figure n.2 A metal thin film microcapillary reactor for microwave-assisted flow synthesis. (Reproduced with permission from Ref. [16b]. Copyright Wiley-VCH Verlag GmbH.)... 

Aksay and coworkers [20] produced mesoscopic patterning of oriented nan-ostructured silica thin films polymerized by a surfactant-templated sol-gel technique [21] in combination with a micromolding technique, which is another microfabrication technique without photolithography proposed by Xia and Whitesides [19]. A network pattern of microcapillaries (submicrometer scale) was transferred to an elastomeric PDMS stamp as a microreplica molding. An aqueous mixture of tetraethoxysilane and a cationic surfactant (CTAC cetyltri-methylammonium chloride) was introduced into the microcapillaries. After hydrolysis of tetraethoxysilane at the cationic interface of the tubular surfactant assemblies, a mesoscopic supramolecular structure hierarchically constituted from hexagonally packed nanoscopic tubules of silica was formed in the microscopic capillary. 

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