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3D printed liquid cooling interface for a deep-UV-LED-based flow-through absorbance detector

Lam, SC, Gupta, V ORCID: 0000-0003-1458-824X, Haddad, PR and Paull, B ORCID: 0000-0001-6373-6582 2019 , '3D printed liquid cooling interface for a deep-UV-LED-based flow-through absorbance detector' , Analytical Chemistry, vol. 91, no. 14 , 8795−8800 , doi: 10.1021/acs.analchem.9b01335.

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Abstract

Ultraviolet (UV)-light-emitting diodes (LEDs) are now widely used in analytical absorbance-based detectors; as compared to conventional UV lamps, they offer lower cost, faster response time, and higher photon conversion efficiency. However, current generation deep-UV-LEDs produce excess heat when operated at normal operating currents, which affects output stability and reduces their overall performance and lifespan. Herein a 3D printed liquid cooling interface has been developed for a deep-UV-LED-based optical detector, for capillary format flow-through detection. The interface consists of a circular channel that is tightly wrapped around the LED to provide active liquid cooling. The design also facilitates easy plug-and-play assembly of the various essential components of the detector: specifically, a 255 nm UV-LED, a capillary Z-cell, and a broadband UV photodiode (PD). The unique liquid cooling interface improved the performance of the detector by reducing the LED temperature up to 22°C, increasing the spectral output up to 34%, decreasing the required stabilization time by up to 6-fold, and reducing the baseline noise and limits of detection (LODs) by a factor of 2. The detector was successfully used within a capillary HPLC system and could offer a miniaturized, rapidly stabilized, highly sensitive, and low-cost alternative to conventional UV detectors.

Item Type: Article
Authors/Creators:Lam, SC and Gupta, V and Haddad, PR and Paull, B
Keywords: deep-UV-LED, liquid cooling, 3D printing, capillary LC, detector
Journal or Publication Title: Analytical Chemistry
Publisher: American Chemical Society
ISSN: 0003-2700
DOI / ID Number: 10.1021/acs.analchem.9b01335
Copyright Information:

Copyright 2019 American Chemical Society

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