UV-LED photopolymerised monoliths

Ābele, Silvija; Nie, Fu-Qiang; Foret, František; Paull, Brett; Macka, Mirek

doi:10.1039/b802693a

Cited by 34 publications

(28 citation statements)

References 19 publications

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“…Abele et al proposed the use of 3-(trimethoxysilyl)propyl methacrylate to promote surface attachment of the monolith to the COC surface [28]. The mechanism of this method is unclear due to the lack of surface hydroxyl groups typically required for the silanising reaction.…”

Section: Coc Capillariesmentioning

confidence: 98%

“…Light sources for the formation of photoinitiated monoliths vary from expensive dedicated flood exposure systems [26] to more common UV tubes [27] or UV LEDs [28][29]. Despite the importance of the light source for the quality of the monolith, poor spectral matches between the light source, the photoinitiator and the photodegradation products can result in non-homogenous and irreproducible monolith formation, little attention is paid to justification of the light source and photoinitiator in the literature.…”

Section: Introductionmentioning

confidence: 99%

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UV initiated formation of polymer monoliths in glass and polymer microreactors

Deverell

Rodemann

Smith

et al. 2011

Sensors and Actuators B: Chemical

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Section: Coc Capillariesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

UV initiated formation of polymer monoliths in glass and polymer microreactors

Deverell

Rodemann

Smith

et al. 2011

Sensors and Actuators B: Chemical

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“…Better spatial control of monolith formation is possible with photoinitiatedpolymerisation than other techniques including thermal polymerisation. Recently it has been demonstrated that Light Emitting Diodes (LEDs) with wavelengths in the UV and visible region can be used as light sources for successful photoinitiatedpolymerisation of monoliths [7][8][9]. LEDs are an interesting alternative to traditional (incandescent and fluorescent) light sources having low cost, long life and unique spectral properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical model for light propagation and light intensity distribution inside coated fused silica capillaries

Piasecki

Macka

Paull

et al. 2011

Optics and Lasers in Engineering

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Numerical simulations of light propagation through capillaries have been reported to a limited extent in the literature for uses such as flow-cell design. These have been restricted to prediction of light path for very specific cases to date. In this paper, a new numerical model of light propagation through multi-walled cylindrical systems, to represent coated and uncoated capillaries is presented. This model allows for light ray paths and light intensity distribution within the capillary to be predicted. Macro-scale (using PMMA and PC cylinders) and micro-scale (using PTFE coated fused silica capillaries) experiments were conducted to validate the model's accuracy. These experimental validations have shown encouragingly good agreement between theoretical predictions and measured results, which could allow for optimisation of associated regions for monolith synthesis and use in fluidic chromatography, optical detection systems and flow cells for capillary electrophoresis and flow injection analysis.

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“…There are many factors which influence this stability such as the nature and surface area of the packed bed and packing material, the Joule heating [43] and ''frit effect'' [44][45][46][47]. In this study, short section (or layer) photopolymethacrylate monolithic frits with isooctane/toluene as the porogen (Fig.…”

Section: Generation Of Stable Eof For Reproducible Cecmentioning

confidence: 99%

Monodispersed submicron porous silica particles functionalized with CD derivatives for chiral CEC

Wang

Young

et al. 2010

Electrophoresis

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Rapid and efficient enantioseparation of halogen aryl alcohols and beta-blockers propranolol and pindolol in packed bed CEC (p-CEC) using as-prepared submicron porous silica chiral stationary phases (CSPs) has been achieved. Monodispersed 0.66 and 0.81 microm chiral submicron porous silica spheres were prepared using tetramethoxysilane and hexadecyltrimethylammonium bromide, followed by a hydrothermal treatment method with ammonia-ethanol to expand the pore of silica spheres without changing their spherical morphology. A proper specific surface of ca. 230 m(2)/g and pore sizes average of 6-8 nm were obtained by this method. The submicron porous silica spheres were modified with mono-6-phenylcarbamoylated beta-CD via thiol-en radical addition. They were packed into 9 cm 50 microm id capillary columns with photopolymerized monolithic frits. These submicron CSPs showed greater column efficiency (about 476 000 plates/m for 4-iodophenyl-1-ethanol) and higher resolution than the corresponding 3 microm CSP.

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UV-LED photopolymerised monoliths

Abstract: For the first time photopolymerisation of polymer monoliths has been realised with UV-light emitting diodes (LEDs) as light source and demonstrated with polymethacrylate monoliths created in fused silica capillaries and plastic chips.

Cited by 34 publications

References 19 publications

UV initiated formation of polymer monoliths in glass and polymer microreactors

UV initiated formation of polymer monoliths in glass and polymer microreactors

Numerical model for light propagation and light intensity distribution inside coated fused silica capillaries

Monodispersed submicron porous silica particles functionalized with CD derivatives for chiral CEC

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