Two-Step Laser Photolysis of Flavone and NaBH4 at Organic—Aqueous Liquid Interface Using a Microchannel Reactor: A Method to Avoid Secondary Thermal Side Reactions

Ouchi, Akihiko; Hyugano, Takeshi; Kaneda, Masayuki; Suzuki, Toshiaki; Liu, Chuanxiang

doi:10.1556/jfc-d-14-00025

Cited by 5 publications

(2 citation statements)

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“…The use of pulsed XeCl-excimer radiation or pulsed laser LEDs are rare examples. [37][38][39][40][41] This is even less comprehensible when considering that photochemical conversions often use solar light that is intrinsically unsteady during the course of the day as well as the year. Consequently, there is a knowledge gap on the impact of an unsteady irradiation on photocatalytic transformations.…”

Section: Introductionmentioning

confidence: 99%

Imposed dynamic irradiation to intensify photocatalytic reactions

2021

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Dynamic irradiation is a potent option to influence the interaction between photochemical reactions and mass transport to design high performant and efficient photochemical processes. To systematically investigate the impact of this parameter, the photocatalytic reduction of nitrobenzene was conducted as a test reaction. Dynamic irradiation was realized through provoked secondary flow patterns, multiple spatially distributed light emitting diodes (LEDs) and electrical pulsation of LEDs. A combined experimental and theoretical approach revealed significant potential to enhance photochemical processes. The reaction rate was accelerated by more than 70% and even more important the photonic efficiency was increased by more than a factor of 4. This renders imposed dynamic irradiation an innovative and powerful tool to intensify photoreactions on the avenue to large scale sustainable photochemical processes.

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Section: Introductionmentioning

confidence: 99%

Imposed dynamic irradiation to intensify photocatalytic reactions

2021

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“…Notably, the PDMS-based microchannel promises an innovative microfluidic approach that significantly impacts numerous applications [ 6 ], including biological analysis [ 7 ], microelectronics fabrication [ 8 ], analytical chemistry [ 9 ], and biological applications [ 10 ]. Moreover, the micropatterned PDMS is considered the attractive platform for a photochemical reaction regarding the enhanced reaction rate and high selectivity attributed mainly to its intrinsic light transmittance, large surface-area-to-volume ratio, enhanced mass transport, and ease of flow control [ 11 ]. In particular, these characteristics of PDMS-based microchannels could provide a promising approach for developing a process for the sphericalization of metal and ceramic nanoparticles through high-energy laser irradiation, which has recently received much attention [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Perforated PDMS Microchannel by Successive Laser Pyrolysis

Min

Lim

et al. 2021

Materials

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Poly(dimethylsiloxane) has attracted much attention in soft lithography and has also been preferred as a platform for a photochemical reaction, thanks to its outstanding characteristics including ease of use, nontoxicity, and high optical transmittance. However, the low stiffness of PDMS, an obvious advantage for soft lithography, is often treated as an obstacle in conducting precise handling or maintaining its structural integrity. For these reasons, a Glass-PDMS-Glass structure has emerged as a straightforward alternative. Nevertheless, several challenges are remaining in fabricating Glass-PDMS-Glass structure through the conventional PDMS patterning techniques such as photolithography and etching processes for master mold. The complicated techniques are not suitable for frequent design modifications in research-oriented fields, and fabrication of perforated PDMS is hard to achieve using mold replication. Herein, we utilize the successive laser pyrolysis technique to pattern thin-film PDMS for microfluidic applications. The direct use of thin film at the glass surface prevents the difficulties of thin-film handling. Through the precise control of photothermal pyrolysis phenomena, we provide a facile fabrication process for perforated PDMS microchannels. In the final demonstration, the laminar flow has been successfully created owing to the smooth surface profile. We envision further applications using rapid prototyping of the perforated PDMS microchannel.

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