[ANAL-23]Photothermal detection in microreactors using a luminescent temperature sensing layer

We used a thermal lens microscopy to detect photothermal effect of polydopamine (PDA) nanoparticles in a micro reactor. The change of temperature upon photothermal heating on PDA nanoparticles can be detected using a Ru(phen)3-PAN luminescent temperature sensing layer on bottom of micro reactor. PDA nanoparticles exhibited a photothermal effect with an increase of temperature over 10 K under a 532 nm laser excitation.

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[ANAL-22]A highly efficient microfluidic particles removal device with staggered herringbone micromixers

As the serios Particulate matter(PM) has caused health threat to human health. We present a conceptually new method (different from traditional filter-based approach) that uses a microfluidic device by patterning the microchannel walls with staggered herringbone micromixers (SHMs). Our device shows > 90% and > 99% removal efficiencies for PM2.5 and PM2.5-10 while it could supply the same range of flow rate with a lower pressure drop compared with commercial particulate masks.

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[ANAL-20]Micro flow reactors with an integrated optical trace oxygen sensor

The presented micro flow reactors with integrated optical trace oxygen sensor was fabricated in a mild and non-cleanroom environment. It was sensitive to the amount of dissolved oxygen in tetrahydrofuran. Under the luminescence microscope, it had KSV of 0.027 % v/v-1 and limit of detection of 0.14 % v/v oxygen in tetrahydrofuran. It will be used to monitor the concentration of oxygen in chemical syntheses.

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[ANAL-19]Continuous preparative separation of nanoparticles on a free-flow electrophoretic microchip

In this work, a low-cost, straightforward, and fast fabrication method by using poly(ethylene glycol) diacrylate (PEG-DA) was presented to produce a micro free-flow electrophoresis (µFFE) device; the photolithography of PEG-DA laminated between two glass slides allows simultaneous bonding and structural development of the microfluidic layout. The most encountered issue of electrolytic bubbles intrusion in the separation chamber was successfully solved via integration of conductive hydrogel walls, which provides physical isolation while maintaining the electrical conductivity between the channels.

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