We present a microfluidic reactor that utilizes meandering microchannel shape to mix reagents inside droplets in a carrier fluid to synthesize silica and silica coated nanoparticles. Meandering channels decrease mixing time due to reduced diffusion lengths. Moreover, droplet-based flow provides uniform reaction times due to the circulating flow profile inside droplets as opposed to parabolic flow profile in straight channels. Before fabricating our device, we have simulated the mixing performance of droplets at different channel cross-sections and meandering geometries using Comsol Multiphysics©. As a result, we have concluded that channel cross-section and meandering dimensions should be as small as possible for faster mixing. Accordingly, we have fabricated our device in PDMS by using soft lithography technique and introduced chemicals to the microsystem by using syringe pumps. We will use this system to understand the effect of solvent concentration and residence time on silica formation to obtain better coating thickness distribution than in batch-wise methods. As a preliminary study, we tested the silica formation inside droplets and we obtained 102 nm ± 4 nm of silica nanoparticles. In the synthesis we followed a modified method of synthesis in the literature where droplets of solution composed of 20 mL Cyclohexane, 2.6 mL IGEPAL and 300 μL TEOS were formed inside the carrier fluid NH4OH at a flow rate ratio of 2:1. It is observed that nanoparticles were synthesized as a result of diffusion and mixing of NH4OH inside droplets. Currently, we are working on introducing QDs in droplets and coating them with silica shells inside the microreactor. We will also study the effects of NH4OH concentration, residence time on silica shell thickness and compare with batch-wise silica synthesis and coating of quantum dots and present these results at the conference.
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ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems
July 6–9, 2015
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division
- Fluids Engineering Division
ISBN:
978-0-7918-5687-1
PROCEEDINGS PAPER
Silica Synthesis and Coating of Quantum Dots in Droplet Based Microreactors Available to Purchase
Alican Özkan,
Alican Özkan
Bilkent University, Ankara, Turkey
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Yusuf Keleştemur,
Yusuf Keleştemur
Bilkent University, Ankara, Turkey
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Hilmi Volkan Demir,
Hilmi Volkan Demir
Bilkent University, Ankara, Turkey
Nanyang Technological University, Singapore
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E. Yegan Erdem
E. Yegan Erdem
Bilkent University, Ankara, Turkey
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Alican Özkan
Bilkent University, Ankara, Turkey
Yusuf Keleştemur
Bilkent University, Ankara, Turkey
Hilmi Volkan Demir
Bilkent University, Ankara, Turkey
Nanyang Technological University, Singapore
E. Yegan Erdem
Bilkent University, Ankara, Turkey
Paper No:
ICNMM2015-48765, V001T05A001; 9 pages
Published Online:
November 18, 2015
Citation
Özkan, A, Keleştemur, Y, Demir, HV, & Erdem, EY. "Silica Synthesis and Coating of Quantum Dots in Droplet Based Microreactors." Proceedings of the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. San Francisco, California, USA. July 6–9, 2015. V001T05A001. ASME. https://doi.org/10.1115/ICNMM2015-48765
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