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Bezrukov A, Galyametdinov Y. Dynamic Flow Control over Optical Properties of Liquid Crystal-Quantum Dot Hybrids in Microfluidic Devices. MICROMACHINES 2023; 14:mi14050990. [PMID: 37241613 DOI: 10.3390/mi14050990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/27/2023] [Accepted: 04/29/2023] [Indexed: 05/28/2023]
Abstract
In this paper, we report developing approaches to tuning the optical behavior of microfluidic devices by infusing smart hybrids of liquid crystal and quantum dots into microchannel confinement. We characterize the optical responses of liquid crystal-quantum dot composites to polarized and UV light in single-phase microflows. In the range of flow velocities up to 10 mm/s, the flow modes of microfluidic devices were found to correlate with the orientation of liquid crystals, dispersion of quantum dots in homogeneous microflows and the resulting luminescence response of these dynamic systems to UV excitation. We developed a Matlab algorithm and script to quantify this correlation by performing an automated analysis of microscopy images. Such systems may have application potential as optically responsive sensing microdevices with integrated smart nanostructural components, parts of lab-on-a-chip logic circuits, or diagnostic tools for biomedical instruments.
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Affiliation(s)
- Artem Bezrukov
- Department of Physical and Colloid Chemistry, Kazan National Research Technological University, 420015 Kazan, Russia
| | - Yury Galyametdinov
- Department of Physical and Colloid Chemistry, Kazan National Research Technological University, 420015 Kazan, Russia
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Kurilov AD, Chausov DN, Osipova VV, Sagdeev DO, Chekulaev IS, Kucherov RN, Belyaev VV, Galyametdinov YG. Concentration-dependent dielectric and electro-optical properties of composites based on nematic liquid crystals and CdS:Mn quantum dots. SOFT MATTER 2023; 19:2110-2119. [PMID: 36857700 DOI: 10.1039/d2sm01352e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Composites in a wide concentration range of 0-0.6 wt% based on a nematic liquid crystal mixture and CdS quantum dots doped with manganese ions (Mn 6%) are presented. The effect of the CdS:Mn quantum dots on the phase diagram and electronic structure of composites was studied using differential scanning calorimetry and fluorescence analysis. Nonmonotonic concentration-dependent changes in the clearing point, which correlate with the fluorescence quenching behavior of the main CdS:Mn peak, were found. Dielectric spectroscopy and electro-optic studies revealed a corresponding increase in the dielectric permittivity anisotropy and birefringence in the 0.2-0.4 wt% range, where thermodynamic changes occur. The initiating factors behind this effect are supposed to be the self-assembly of quantum dots, and the distortion of the orientation order of liquid crystal molecules at a higher mass concentration of quantum dots.
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Affiliation(s)
- Alexander D Kurilov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova St, Moscow, 119991, Russia.
- Moscow Region State University, 24 Very Voloshinoy St., 141014, Mytishchi, Russia
| | - Denis N Chausov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova St, Moscow, 119991, Russia.
- Moscow University for Industry and Finance "Synergy", 2 Izmailovsky Val St., Moscow, 105318, Russia
| | - Valentina V Osipova
- Kazan National Research Technological University, 68 K. Marx St., 420015, Kazan, Russia
| | - Dmitriy O Sagdeev
- Kazan National Research Technological University, 68 K. Marx St., 420015, Kazan, Russia
| | - Igor S Chekulaev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova St, Moscow, 119991, Russia.
- Moscow Region State University, 24 Very Voloshinoy St., 141014, Mytishchi, Russia
| | - Roman N Kucherov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova St, Moscow, 119991, Russia.
- Moscow Region State University, 24 Very Voloshinoy St., 141014, Mytishchi, Russia
| | - Victor V Belyaev
- Moscow Region State University, 24 Very Voloshinoy St., 141014, Mytishchi, Russia
| | - Yuriy G Galyametdinov
- Kazan National Research Technological University, 68 K. Marx St., 420015, Kazan, Russia
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Kovalchuk O, Kovalchuk T, Tomašovičová N, Timko M, Zakutanska K, Miakota D, Kopčanský P, Shevchuk O, Garbovskiy Y. Dielectric and electrical properties of nematic liquid crystals 6CB doped with iron oxide nanoparticles. The combined effect of nanodopant concentration and cell thickness. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bezrukov AN, Osipova VV, Galyametdinov YG. Orientational behavior of a nematic liquid crystal and its composite with quantum dots in a microfluidic channel. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3631-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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