Thermodynamically Stable Dispersions of Quantum Dots in a Nematic Liquid Crystal

Prodanov, Maksym F.; Pogorelova, Nataliya V.; Kryshtal, A. P.; Klymchenko, Andrey S.; Mély, Yves; Semynozhenko, V.P.; Krivoshey, Alexander I.; Reznikov, Yurii; Yarmolenko, Sergey; Goodby, John W.; Vashchenko, V. V.

doi:10.1021/la401475b

Cited by 77 publications

(67 citation statements)

References 61 publications

(116 reference statements)

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“…Recently, dendrimer-like ligands were also successfully designed to optimize QD dispersion in a liquid crystal. [27] ODA-functionalized QDs were supplied by NNlabs Inc. The mesogenic ligand (11) was synthesized as shown in Scheme 1 Figure 1.…”

Section: Quantum-dot Synthesis and Characterizationmentioning

confidence: 99%

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Tuning Quantum‐Dot Organization in Liquid Crystals for Robust Photonic Applications

et al. 2014

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Mesogenic ligands have the potential to provide control over the dispersion and stabilization of nanoparticles in liquid crystal (LC) phases. The creation of such hybrid materials is an important goal for the creation of soft tunable photonic devices, such as the LC laser. Herein, we present a comparison of isotropic and mesogenic ligands attached to the surface of CdSe (core‐only) and CdSe/ZnS (core/shell) quantum dots (QDs). The mesogenic ligand′s flexible arm structure enhances ligand alignment, with the local LC director promoting QD dispersion in the isotropic and nematic phases. To characterize QD dispersion on different length scales, we apply fluorescence microscopy, X‐ray scattering, and scanning confocal photoluminescent imaging. These combined techniques demonstrate that the LC‐modified QDs do not aggregate into the dense clusters observed for dots with simple isotropic ligands when dispersed in liquid crystal, but loosely associate in a fluid‐like droplet with an average interparticle spacing >10 nm. Embedding the QDs in a cholesteric cavity, we observe comparable coupling effects to those reported for more closely packed isotropic ligands.

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Section: Quantum-dot Synthesis and Characterizationmentioning

confidence: 99%

“…To address this problem, there have been recent attempts to design nanoparticles with mesogenic liquid-crystal-like ligands using gold [24][25][26] and semiconductor [27] nanocrystals. These strategies have proved effective in modulating nanoparticle dispersal in the nematic phase.…”

Section: Introductionmentioning

confidence: 99%

Tuning Quantum‐Dot Organization in Liquid Crystals for Robust Photonic Applications

et al. 2014

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“…Self assembly of sub-micron particles, such as gold nanoparticles, 1 quantum dots, 2 and magnetic particles [3][4][5][6][7][8] into superstructures, hosted in functional matrices, provides an avenue for producing multi-stimuli responsive materials. Liquid crystalline (LC) matrices are functional mediums that exhibit a plethora of ordering motives connected with directional and translational sensitivity to external stimuli.…”

Section: Introductionmentioning

confidence: 99%

Orientational order and translational dynamics of magnetic particle assemblies in liquid crystals

Peroukidis

Klapp

2016

Soft Matter

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Implementing extensive molecular dynamics simulations we explore the organization of magnetic particle assemblies (clusters) in a uniaxial liquid crystalline matrix comprised of rodlike particles. The magnetic particles are modelled as soft dipolar spheres with diameter significantly smaller than the width of the rods. Depending on the dipolar strength coupling the magnetic particles arrange into headto-tail configurations forming various types of clusters including rings (closed loops) and chains. In turn, the liquid crystalline matrix induces long range orientational ordering to these structures and promotes their diffusion along the director of the phase. Different translational dynamics are exhibited as the liquid crystalline matrix transforms either from isotropic to nematic or from nematic to smectic state. This is caused due to different collective motion of the magnetic particles into various clusters in the anisotropic environments. Our results offer a physical insight for understanding both the structure and dynamics of magnetic particle assemblies in liquid crystalline matrices.

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“…We will discuss our approaches to producing liquid crystal-based materials with defined nanoparticle distributions, focusing specifically on quantum dots owing to their unique size-tunable luminescent properties. Nanoparticle ligands can be designed to respond to the ordered molecular environment of a liquid crystal phase, inducing dispersion [12], clustering [13] or assembly at the interface of a liquid crystal phase transition [14]. These techniques can provide easily scalable methods for producing a rich variety of quantum dot and nanoparticles assemblies.…”

Section: Introductionmentioning

confidence: 99%

Quantum Dot/Liquid Crystal Nanocomposites in Photonic Devices

et al. 2015

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Quantum dot/liquid crystal nano-composites are promising new materials for a variety of applications in energy harvesting, displays and photonics including the liquid crystal laser. To realize many applications, however, we need to control and stabilize nano-particle dispersion in different liquid crystal host phases and understand how the particles behave in an anisotropic fluid. An ideal system will allow for the controlled assembly of either well-defined nano-particle clusters or a uniform particle distribution. In this paper, we investigate mesogen-functionalized quantum dots for dispersion in cholesteric liquid crystal. These nanoparticles are known to assemble into dense stable packings in the nematic phase, and such structures, when localized in the liquid crystal defects, can potentially enhance the coupling between particles and a cholesteric cavity. Controlling the dispersion and assembly of quantum dots using mesogenic surface ligands, we demonstrate how resonant fluid photonic cavities can result from the co-assembly of luminescent nanoparticles in the presence of cholesteric liquid crystalline ordering.

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Thermodynamically Stable Dispersions of Quantum Dots in a Nematic Liquid Crystal

Cited by 77 publications

References 61 publications

Tuning Quantum‐Dot Organization in Liquid Crystals for Robust Photonic Applications

Tuning Quantum‐Dot Organization in Liquid Crystals for Robust Photonic Applications

Orientational order and translational dynamics of magnetic particle assemblies in liquid crystals

Quantum Dot/Liquid Crystal Nanocomposites in Photonic Devices

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