puma slides

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puma slides

Postprzez ArchibaldBuck » Wt, 7 kwi 2020, 08:30

We recently reported a new UV-curable polyurethane-meth-acrylate (PUMA) resin that is puma creepers non-elastomeric and has excellent qualities as a disposable microfluidic substrate, especially for clinical diagnostic applications. 18 This PUMA substrate is transparent optically, resistant to biofouling, compatible with many chemicals encountered in microfluidic applications, curable to a typical thickness (about the thickness of glass slides), bondable to form enclosed devices easily.

Providing nominally 80 mW/cm 2 at 365 nm) for 80 sec (expose through resin side), followed by an additional 40 sec (expose through mold). Once released from the mold, PUMA substrate was conformally bonded to another PUMA-coated (cured) glass coverslip with gentle mechanical pressure. This conformal bond was converted to permanent bond by placing the PUMA chip under the UV puma fenty flood source for an additional 10 min. Material layout during molding of PUMA chip. 1 : PDMS mold; 2 .

Causing delamination from the adhesive. The best tubing among those evaluated was the 1/16-in OD PTFE tubing. Although it is puma slides nearly impossible to chemically bond to PTFE tubings, that can be circumvented by covering the external surface with a polyolefin heat-shrink. Then the PTFE tubing may be inserted either directly into a 1/16-in diameter hole and secured with additional resin, or into a 1/8-in hole with a supplemental PU tubing (1/8-in OD) as a shear anchor, and lastly secured with additional resin.

For creating small through-holes in PUMA, we found laser-cutting to be more convenient than embedding and then removing PTFE puma rihanna posts. Sharpened punches do not produce clean holes in PUMA as they do in PDMS. We had tested an Epilog Helix CO 2 laser-cutting system (45W; laser made by Coherent) which is commonly used as a computer-controlled souvenir or sign engraver. We noticed two minor issues with laser-cutting: (1) sputtering of melted plastic could damage structures or block channels; and (2) rastering rate.

A 180° bend was incorporated in the design to help troubleshooting if there were directional issues in either the replication or demolding process. As evident in Fig. 2A , the columns produced in PUMA had a sharp vertical profile with no evidence of leaning.We found that for low-aspect-ratio features the cured PUMA resin could be released from the PDMS mold either by (1) peeling the mold slightly away from the cured resin or (2) wedging puma suede classic a scalpel between the resin and the mold to gently lift up the resin.

After UV curing, the PUMA-PDMS assembly was placed on the base suction cup and the vacuum pump was turned on. The base suction cup held the PDMS mold in place while the upper suction cup was slowly brought down to contact the transparent polypropylene cover on top of the cured resin. The touch-down speed should be sufficiently slow such that minimal downward force was exerted on the resin. Once the vacuum gauge on the pump dropped Obrazek from atmospheric pressure to the ultimate pressure of the pump.
ArchibaldBuck
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Dołączył(a): Wt, 7 kwi 2020, 08:17

Postprzez » Wt, 7 kwi 2020, 08:30

 

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