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    Low voltage electrowetting of non-aqueous fluorescent quantum dot nanofluids

    Year: 2022

    Journal: J. Mol. Liq., Volume 359, AUG 1

    Authors: Tohgha, Urice N.; Watson, Alexander M.; Godman, Nicholas P.

    Organizations: Materials and Man-ufacturing Directorate within the Air Force Research Laboratory (AFRL) [FA8650-16-D5404-0009]

    Keywords: QD nanofluids; Electrowetting; Voltage; Contact angle; Non-aqueous; Fluorescent QDs

    We present electrowetting studies of diverse non-aqueous CdSe quantum dot (QD) nanofluids with desirable optical properties for electrowetting and electrofluidic display applications. The QD-nanofluids investigated herein include QD-2.9 (CdSe/ZnS: average size 2.9 nm), QD-18 (CdSe/CdS: 2.9 nm core with thick gradient shell for average size 18 nm), and QD-T (CdSe/ZnS tetrapods: 4.7 nm and 3.5 nm average arm length and width respectively). Low voltage and reversible droplet wettability was achieved while maintaining the fluorescent properties of QD nanofluids in both dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). Maximum contact angle (CA) change with minimal voltage application (delta theta(10V) = 78 +/- 3) was achieved for QD-T and QD-2.9 DMF-based nanofluids which is desired for practical applications. Conversely, there was comparable wettability of QD-18 nanofluids in DMF and DMSO, stemming from QD size effects. The robust electrowetting of non-aqueous QD nanofluids has important implications for droplet-driven display and digital microfluidic applications. Published by Elsevier B.V.
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