Instantaneous catalytic carbon-carbon bond forming reactions were achieved in a microchannel reactor having a polymeric palladium complex membrane. The catalytic membrane was constructed inside the microchannel via self-assembling complexation at the interface between the organic and aqueous phases flowing laminarly, where non-cross-linked polymer-bound phosphine and ammonium tetrachloropalladate dissolved, respectively. A palladium-catalyzed coupling reaction of aryl halides and arylboronic acids was performed using the microchannel reactor to give quantitative yields of biaryls within 4 s of retention time in the defined channel region.
[Show abstract][Hide abstract] ABSTRACT: A microfluidic system with a wide surface area per unit volume has the potential for use in highly efficient chemical synthesis, separation, and extraction. In the case of efficient water/oil separation and material extraction, it be-comes important to form a stable two-layer laminar flow interface. Previously, we developed a silicon/glass microfluidic reactor, in which microchannel inner walls were modified to produce hydrophilic/hydrophobic surface. In this work, flow behavior and separation of this microreactor was evaluated. This microfluidic chip made it possible to form a stable two-layer laminar flow interface between a flow of heavier water and lighter hexane, which were introduced into the upper and lower inlets, respectively. The efficiency in separation was examined using water and hexane. Under certain conditions including the pressure difference between the two outlet surfaces, complete phase separation was achieved. This result in-dicates that the highly efficient separation and stable interface formed by this microfluidic chip can be applied to immisci-ble liquid-liquid operations with the complete separation of the liquids at the outlets.
[Show abstract][Hide abstract] ABSTRACT: This paper proposes a new integrated diagnostic system for
induction machine electrical fault diagnosis by means of a neurofuzzy
approach. New features that are of multiple frequency resolutions are
extracted by wavelet packet decomposition of the stator current. These
features can then clearly differentiate the healthy and faulty
conditions. Features with different frequency resolutions together with
the slip speed of the induction motor am used as the input sets for a
neuro -fuzzy inference system. Two common electrical faults, the rotor
bar breakage and the air gap eccentricity are considered. The system is
validated on a 5 HP three-phase induction motor. Successful
implementation of the proposed diagnostic system has been demonstrated
IFSA World Congress and 20th NAFIPS International Conference, 2001. Joint 9th; 08/2001
[Show abstract][Hide abstract] ABSTRACT: (Figure Presented) Drudgery minimized, efficiency maximized: By combining catalysis and separation in microcapillaries greater than 2 cm in length, it is possible to efficiently determine the reaction kinetics for entire libraries of substrates. This was demonstrated for hydrogenations over highly active Pd nanoparticles and ring-closing metatheses over the Grubbs 2nd generation catalyst. R: reagents, P: products.
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