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Fullerene Liquid Crystal Compounds Containing Double Bonds and Their Applications

A technology of liquid crystal compounds and fullerenes is applied in the application field of preparing tunable photonic crystals, which can solve the problem of low refractive index contrast of photonic crystals, and achieve the effects of high refractive index contrast and excellent optical performance.

Active Publication Date: 2020-10-09
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the refractive index of liquid crystal filling materials currently used to prepare photonic crystals is generally between 1.5 and 1.6; for example, in commonly used colloidal crystal templates, the refractive index of silicon dioxide is 1.45, and that of polystyrene 1.59, therefore, the refractive index contrast of photonic crystals obtained by the above materials is not high

Method used

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  • Fullerene Liquid Crystal Compounds Containing Double Bonds and Their Applications
  • Fullerene Liquid Crystal Compounds Containing Double Bonds and Their Applications
  • Fullerene Liquid Crystal Compounds Containing Double Bonds and Their Applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1 8-(3,4,5-tris(octenyloxy)benzoate) octanediol ester of 1-fullerene acetate (C 8 -C 8 -C 60 -ene) (molecular structure such as Figure 1 Shown) Preparation:

[0046] (1) Synthesis and characterization of 8-bromo-1-octene

[0047] To a THF (100 mL) solution containing potassium tert-butoxide (0.12 mol), was added a THF (50 mL) solution of 1,8-dibromooctane (0.1 mol), and stirred at room temperature for 1 hour. Afterwards, the reaction solution was poured into deionized water (200 mL), extracted with ether (3×60 mL), and the organic phase was collected. The organic phase was sequentially washed with 5% Na 2 CO 3 The solution was washed twice with water and three times with deionized water, dried over anhydrous sodium sulfate, filtered, and rotary evaporated. The collected crude product was distilled by distillation under reduced pressure to obtain the pure product as a colorless liquid. The above reaction process is as follows:

[0048]

[0049] NMR c...

Embodiment 2

[0067] Example 2 Preparation and Performance Testing of Photonic Crystals

[0068] (1) Silicon dioxide (SiO 2 ) preparation of microspheres

[0069] use Monodisperse SiO with different particle sizes prepared by method 2 particles. The specific operation process is as follows: Into a 250mL round bottom flask, add 65.5mL ethanol, 20mL deionized water, 10mL ammonia water, and 4.5mL tetraethyl orthosilicate (TEOS), stir vigorously for 1min, then reduce the stirring speed and react at room temperature for 3h. The reaction solution was centrifuged, then dispersed with absolute ethanol, and centrifuged again. Anhydrous ethanol dispersion and centrifugation were performed twice. Finally, the prepared SiO 2 Particles were preserved in absolute ethanol to obtain SiO 2 particle dispersion. SiO with different sizes obtained by adjusting the ratio of ammonia / deionized water / TEOS 2 particles. Such as Figure 6 shown.

[0070] (2) SiO 2 Preparation of colloidal crystal templat...

Embodiment 3

[0076] Example 3: Preparation and testing of photonic crystals

[0077] (1) Preparation of polymer (P(St-MMA-AA)) microspheres

[0078] In a 250mL three-neck round bottom flask, first add 100mL deionized water and a certain amount of sodium dodecylbenzenesulfonate (SDBS), weigh the monomer styrene (19g, St), methyl methacrylate (1g, MMA), acrylic acid (1.2g, AA), and crosslinking agent divinylbenzene (0.9g, DVB) were mixed evenly, and then the monomer mixture was added to the SDBS aqueous solution. Access to N 2 , after timing for 5 minutes, the system began to heat up while stirring at a stirring speed of 350 rpm. Prepare 0.5 g of ammonium persulfate (APS) in 20 mL of deionized water. When the temperature of the reaction solution was raised to 90° C., 8 mL of APS aqueous solution was added to the reaction solution, and the timing was started. After reacting for 2 hours, 6 mL of APS aqueous solution was added, and after continuing to react for 2 hours, the remaining 6 mL o...

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Abstract

The invention discloses a fullerene liquid crystal compound which has a high refractive index and contains double-bond functional groups, a preparation method of the liquid crystal compound, and an application of the liquid crystal compound serving as a filling material in the field of photonic crystals. The fullerene liquid crystal molecular structure is composed of three parts, namely a rigid fullerene acid part, a flexible double bond-containing gallic acid derivative part, and a flexible chain segment part connecting the rigid fullerene acid part and the flexible double-bond-containing gallic acid derivative part; the precursor of the flexible chain segment is diol; and two ends of the flexible chain segment are respectively connected with the fullerene acid part and the double bond-containing gallic acid derivative part through ester bonds. The fullerene liquid crystal compound has high refractive index, so that the compound can well replace a liquid crystal molecule with low refractive index to serve as the filling material of the photonic crystal, and the photonic crystal with high refractive index contrast ratio and excellent performance is obtained.

Description

technical field [0001] The invention relates to a liquid crystal compound and the application of the liquid crystal compound in preparing tunable photonic crystals. Background technique [0002] Photonic crystals are materials with ordered structures formed by arranging two or more materials with different dielectric constants in a certain periodic order in space. When the electromagnetic wave propagates in this material with a periodic structure, it will be modulated by the periodic potential field formed by the dielectric, thus forming a photonic energy band similar to the semiconductor energy band structure. If there is no overlap between the photonic energy bands, a photonic bandgap or a photonic bang gap (PBG) will be formed. Liquid crystal has a very large optical anisotropy and is very sensitive to changes in the external environment (electric field, magnetic field, temperature or polarized light, etc.), so it has attracted great attention as one of the filling mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/92C09K19/32C07C67/29C07C67/08C07C67/31C07C17/25C07C21/14C07C51/09C07C65/28
CPCC07B2200/11C07C17/25C07C51/09C07C67/08C07C67/29C07C67/31C07C69/92C09K19/32C07C21/14C07C65/28
Inventor 张小艳丛海林于冰单玉领
Owner QINGDAO UNIV
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