Microfluidic Devices for Flow-Through Supported Palladium Catalysis on Porous Organic Monolith

2008 ◽  
Vol 61 (8) ◽  
pp. 630 ◽  
Author(s):  
Allan J. Canty ◽  
Jeremy A. Deverell ◽  
Anissa Gömann ◽  
Rosanne M. Guijt ◽  
Thomas Rodemann ◽  
...  
Keyword(s):  
Fused Silica ◽  
Porous Polymer ◽  
Epoxide Ring ◽  
Internal Diameter ◽  
Long Term Stability ◽  
Fused Silica Capillaries ◽  
Polymer Monolith ◽  
Ethylene Dimethacrylate ◽  
Flow Through ◽  
Continuous Material

Flow-through microreactors are described, constructed of fused silica capillaries with an internal diameter of 100 μm and glass microchips with a channel dimension of 150 μm and involving the in situ UV-initiated synthesis of a poly(glycidyl methacrylate-co-ethylene dimethacrylate) porous polymer monolith. The monolith is a continuous material covalently bonded to the capillary or chip walls, with good flow-through properties. Epoxide ring-opening through amine attack by 5-amino-1,10-phenanthroline and coordination to dichloropalladium(ii) allows use of the microreactors for Suzuki–Miyaura catalysis. The long-term stability and reliability of the robust chip microreactor is demonstrated by operation for 96 h, exhibiting undiminished reactivity, and very low leaching of palladium.

Preconcentration of bisphenols by using calix[4]arene derivatives modified porous polymer monolith coupled with HPLC

RSC Advances ◽  
2016 ◽  
Vol 6 (43) ◽  
pp. 36256-36263 ◽  
Author(s):  
Huiqi Wang ◽  
Shigang Wei ◽  
Huihui Zhang ◽  
Qiong Jia
Keyword(s):  
Porous Polymer ◽  
Butyl Methacrylate ◽  
Polymer Monolith ◽  
Polymer Monolith Microextraction ◽  
Ethylene Dimethacrylate ◽  
Porous Polymer Monolith

A functionalized calix[4]arene (alkenyl@C[4]A) was introduced into the poly(butyl methacrylate-ethylene dimethacrylate) monolith inside a capillary to prepare a polymer monolith microextraction (PMME) material (poly(BMA-alkenyl@C[4]A-EDMA)).

A capillary and microchip-based nanoelectrospray emitter using a mesoporous membrane

2008 ◽  
Vol 86 (11) ◽  
pp. 1055-1062 ◽  
Author(s):  
Shuqin Su ◽  
Richard D Oleschuk
Keyword(s):  
Porous Membrane ◽  
Fused Silica ◽  
Porous Polymer ◽  
Outer Diameter ◽  
Microfluidic Chips ◽  
Flow Rates ◽  
Fused Silica Capillaries ◽  
Silica Capillaries ◽  
Fused Silica Capillary ◽  
Inner Diameter

A method is described for the fabrication of multipath electrospray emitters using hydrophobic porous polymer membranes. Polysulphone (PSF) and polycarbonate (PC) membranes, which possess pores with well-defined sizes, are glued onto the exit aperture of fused-silica capillaries or microfluidic chips to create multipaths to assist electrospray at moderate nano flow rates (e.g., 50–500 nL/min). A capillary-based multipath emitter fabricated with either PSF or PC membranes was prepared with a fused-silica capillary with 75 µm inner diameter and 360 µm outer diameter. Relative effects on electrospray performance at different flow rates, electrospray voltages, and solvent compositions are probed. The sensitivity and stability of electrospray signals were enhanced through spraying from multiple pores on the membrane. An embossed polycarbonate microchip was also interfaced to the mass spectrometer using the meso porous membrane approach.Key words: nanoelectrospray, membrane, emitter, multipaths, microchip.

Optimization and evaluation of the performance of arrangements for UV detection in high-resolution separations using fused-silica capillaries

1991 ◽  
Vol 559 (1-2) ◽  
pp. 163-181 ◽  
Author(s):  
G.J.M. Bruin ◽  
G. Stegeman ◽  
A.C. Van Asten ◽  
X. Xu ◽  
J.C. Kraak ◽  
...  
Keyword(s):  
High Resolution ◽  
Fused Silica ◽  
Uv Detection ◽  
Fused Silica Capillaries ◽  
Silica Capillaries

Study of Flow Boiling Characteristics of a Microchannel Using High Speed Visualization

2013 ◽  
Vol 135 (8) ◽  
Author(s):  
Rashid Ali ◽  
Björn Palm ◽  
Claudi Martin-Callizo ◽  
Mohammad H. Maqbool
Keyword(s):  
Heat Flux ◽  
Flow Pattern ◽  
Indium Tin Oxide ◽  
High Speed ◽  
Liquid Velocity ◽  
Flow Boiling ◽  
Fused Silica ◽  
Internal Diameter ◽  
Electrically Conductive ◽  
Heated Length

This paper presents the visualization results obtained for an experimental study of R134a during flow boiling in a horizontal microchannel. The microchannel used was a fused silica tube having an internal diameter of 781 μm, a heated length of 191 mm, and was coated with a thin, transparent, and electrically conductive layer of indium-tin-oxide (ITO) on the outer surface. The operating parameters during the experiments were: mass flux 100–400 kg/m2 s, heat flux 5–45 kW/m2, saturation temperatures 25 and 30 °C, corresponding to saturation pressures of 6.65 bar and 7.70 bar and reduced pressures of 0.163 and 0.189, respectively. A high speed camera with a close up lens was used to capture the flow patterns that evolved along the channel. Flow pattern maps are presented in terms of the superficial gas and liquid velocity and in terms of the Reynolds number and vapor quality plots. The results are compared with some flow pattern maps for conventional and micro scale channels available in the literature. Rigorous boiling and increased coalescence rates were observed with an increase in the heat flux.

A study of surface modification and anchoring techniques used in the preparation of monolithic microcolumns in fused silica capillaries

2006 ◽  
Vol 29 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Julien Courtois ◽  
Michal Szumski ◽  
Emil Byström ◽  
Agnieszka Iwasiewicz ◽  
Andrei Shchukarev ◽  
...  
Keyword(s):  
Surface Modification ◽  
Fused Silica ◽  
Fused Silica Capillaries ◽  
Silica Capillaries

Variation of zeta-potential with temperature in fused-silica capillaries used for capillary electrophoresis

2006 ◽  
Vol 27 (3) ◽  
pp. 672-676 ◽  
Author(s):  
Christopher J. Evenhuis ◽  
Rosanne M. Guijt ◽  
Miroslav Macka ◽  
Philip J. Marriott ◽  
Paul R. Haddad
Keyword(s):  
Capillary Electrophoresis ◽  
Zeta Potential ◽  
Fused Silica ◽  
Fused Silica Capillaries ◽  
Silica Capillaries
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