Hybrid fluorescent liquid crystalline composites: directed assembly of quantum dots in liquid crystalline block copolymer matrices

Bugakov, M. A.; Abdullaeva, Sharifa; Samokhvalov, Pavel; Abramchuk, S. S.; Shibaev, Valéry; Boiko, N. I.

doi:10.1039/d0ra02442b

Cited by 9 publications

(7 citation statements)

References 53 publications

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“…At the same time, diblock copolymers cannot form any bridges between nanoparticles because they have only one binding block. Indeed, as it was proved in our further investigation, QDs embedded in LC diblock copolymers containing PhM and VP blocks did not form any aggregates regardless of the polymerization degree of the diblock copolymers [25]. LC diblock copolymers thus appear more promising and flexible agents for stabilization of QD dispersions in LC phase than LC triblock copolymers.…”

Section: supporting

confidence: 65%

“…As the amorphous VP block cannot participate in the formation of cholesteric phase, the number of mesogenic groups per one molecules of the chiral additives should be higher for the The hybrid CLC material CLC-5%QDs@VP60 was prepared similar to the test mixtures but instead of a LC block copolymer, an LC polymer-QD composite was added. The LC polymer-QD composite was made of the LC diblock copolymer pVP 60 -b-pPhM 40 and CdSe/ZnS QDs as described previously [25]. Relying on the properties of the test mixtures discussed above, the weight fraction of the LC polymer-QD composite in CLC-5%QDs@VP60 was taken equal to 5 wt.…”

Section: mentioning

confidence: 99%

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Optimization of Chemical Structure of Compatibilizers Based on Liquid Crystalline Diblock Copolymers for Reconciliation Between Inorganic Quantum Dots and Organic Cholesteric Liquid Crystals

Bugakov¹,

Boiko²,

Шибаев³

2021

Liq. Cryst. and their Appl.

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One of the key challenge of designing hybrid liquid crystalline (LC) materials is to combine organic and inorganic constituents in one stable system. To overcome this challenge, specially designed substances called compatibilizers may be used but the chemical structure of these substances and their content in the system should be adjusted properly. In this work, we optimized the chemical structure and the weight fraction of a compatibilzer between CdSe/ZnS quantum dots (QDs) and low molecular weight cholesteric liquid crystalline (CLC) matrix. As compatibilizers we used LC diblock copolymers containing a mesogenic block consisting of phenyl benzoate monomer units and poly(vinylpyridine) block of different polymerization degree, which is capable of binding to the surface of various nanoparticles. Using polarized optical microscopy and absorbance spectroscopy we found that the polymerization degree of poly(vinylpyridine) block can exert the influence on the CLC matrix properties such as a photonic band gap width and light scattering. The obtained results allowed us to prepare the hybrid CLC materials, which combine the high loading of QDs and unique optical properties of the cholestric phase. Our approach to creation hybrid CLC materials might be employed as a "flexible template" for the design of many other hybrid LC systems.

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confidence: 65%

confidence: 99%

Optimization of Chemical Structure of Compatibilizers Based on Liquid Crystalline Diblock Copolymers for Reconciliation Between Inorganic Quantum Dots and Organic Cholesteric Liquid Crystals

Bugakov¹,

Boiko²,

Шибаев³

2021

Liq. Cryst. and their Appl.

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“…Fluorescence of QDs was excited by an KLM-473/h 150 laser (Plazma, Moscow, Russia) operating at 473 nm. An incident light intensity was equal to 50 mW/cm 2 as measured with Coherent LaserMate-Q intensity meter [ 56 ].…”

Section: Methodsmentioning

confidence: 99%

Monochelic Versus Telechelic Poly(Methyl Methacrylate) as a Matrix for Photoluminescent Nanocomposites with Quantum Dots

et al. 2021

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Nanocomposites based on CdSe or CdSe/ZnS quantum dots (QDs) and poly(methyl methacrylate) (PMMA) of different molecular weights and functionality were synthesized by ligand exchange of oleic acid with RAFT-based PMMA. The successful ligand exchange was confirmed by dynamic light scattering in combination with the approach “macromolecules—ghosts” and transmission electron microscopy. Comparative study of mono- and telechelics of PMMA revealed the similarities and differences in their behavior in formation of complexes with QDs and the optical properties of the corresponding nanocomposites. Telechelics exhibited higher efficiency in the complex formation and seemed to be promising candidates for the construction of devices based on QDs and polymer matrix for optical applications.

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“…In this vein, recent studies demonstrate dispersion of light-emitting quantum dots in non-LC domains of LC BCPs (Figure 7g,h). 81,90 We expect the use of such strategies to grow in the future, and work along such lines represents an exciting path forward for the development of functional anisotropic nanocomposites. crystal polymers and block copolymers.…”

Section: Complex Texture and Spatial Variation Of Propertiesmentioning

confidence: 99%

Section: Beyond Classical Nanopatterning: Complex Texture and Spatial...mentioning

confidence: 99%

100th Anniversary of Macromolecular Science Viewpoint: Opportunities for Liquid Crystal Polymers in Nanopatterning and Beyond

Lee

2021

ACS Macro Lett.

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Liquid-crystal polymers (LCPs) integrate at a molecular level the characteristics of two important material classes, i.e., liquid crystals (LCs) and polymers. As a result, they exhibit a wide variety of intriguing physical phenomena and have useful properties in various settings. In the nearly 50 years since the discovery of the first melt-processable LCPs, there has been a remarkable expansion in the field encompassing the development of new chain architectures, the incorporation of new classes of mesogens, and the exploration of new properties and applications. As engineering materials, LCPs are historically best known in the context of high strength fibers. In a more contemporary study, the pairing of LC mesophase assembly with block copolymer (BCP) self-assembly in LC BCPs has resulted in a fascinating interplay of ordering phenomena and rich phase behavior, while lightly cross-linked networks, LC elastomers, are extensively investigated as shape memory materials based on their thermomechanical actuation. As this Viewpoint describes, these and other examples are active areas of research in which new, compelling opportunities for LCPs are emerging. We highlight a few selected areas that we view as being potentially significant in the near future, with a particular emphasis on nanopatterning. Here, the ability to readily access small feature sizes, the fluidity of the LC mesophase, and LC-based handles for achieving orientation control present a compelling combination. Opportunities for LCPs are also presented under the broad rubric of “beyond nanopatterning”, and we discuss relevant challenges and potential new directions in the field.

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Hybrid fluorescent liquid crystalline composites: directed assembly of quantum dots in liquid crystalline block copolymer matrices

Abstract: Spatial distribution of QDs within hybrid composite films was programed by varying the molecular architecture of the host LC block copolymers.

Cited by 9 publications

References 53 publications

Optimization of Chemical Structure of Compatibilizers Based on Liquid Crystalline Diblock Copolymers for Reconciliation Between Inorganic Quantum Dots and Organic Cholesteric Liquid Crystals

Optimization of Chemical Structure of Compatibilizers Based on Liquid Crystalline Diblock Copolymers for Reconciliation Between Inorganic Quantum Dots and Organic Cholesteric Liquid Crystals

Monochelic Versus Telechelic Poly(Methyl Methacrylate) as a Matrix for Photoluminescent Nanocomposites with Quantum Dots

100th Anniversary of Macromolecular Science Viewpoint: Opportunities for Liquid Crystal Polymers in Nanopatterning and Beyond

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