Azobenzol liquid crystal holography storage material and preparation method thereof

A storage material and optical holography technology, applied in liquid crystal materials, information storage, recorded information storage and other directions, can solve the problems of easy loss of refractive index modulation of stored information, limited application, etc., achieve good optical properties, simple preparation method, improve The effect of diffraction efficiency

Inactive Publication Date: 2009-09-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, azobenzene compounds have problems such as destructive readout, easy loss of stored information, and low refractive index modulation, which limit their application in the field of optical holographic storage.

Method used

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  • Azobenzol liquid crystal holography storage material and preparation method thereof
  • Azobenzol liquid crystal holography storage material and preparation method thereof
  • Azobenzol liquid crystal holography storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] ①Synthesis of azobenzene unit

[0032] Add p-butoxyaniline (7.8g, 0.05mol) to a solution of 17ml (0.2mol) of concentrated hydrochloric acid and 10ml of water, stir and mix well. Heat with an oil bath to make the solution clear, then quickly put it into an ice-salt bath and stir to obtain good crystals. Keeping the temperature at 0-5°C, sodium nitrite (3.5 g, 0.05 mol) and 20 ml of water were added dropwise with stirring. After 30 min, an equal amount of urea was added to neutralize the remaining sodium nitrite, and the reaction progress was monitored by starch-potassium iodide test paper to obtain a diazonium salt solution. Phenol (4.9 g, 0.05 mol) was dissolved in 10% aqueous sodium hydroxide (4 g, 0.05 mol), and the mixture was cooled to below 10° C. in an ice bath, and then 20 g of ice was added. The above-mentioned diazonium salt solution was slowly added dropwise and stirred rapidly for 1 h, and then a saturated sodium acetate solution was added to adjust the pH ...

Embodiment 2

[0046] ①Synthesis of compounds containing azobenzene and liquid crystal groups

[0047] To 100 ml of dichloromethane were added 4-cyano-4'-carboxybiphenyl (8.3 g, 0.037 mmol), 4,4'-dihydroxyazobenzene (2.6 g, 0.012 mmol) and 4-dimethylaminopyridine (4.5g, 0.037mmol), mix well, pass nitrogen as a protective gas, and then add 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC·HCl). After the mixture was stirred at room temperature for 12 h, dichloromethane was added to dilute, and then saturated NH 4 Cl aqueous solution and saturated sodium chloride aqueous solution were washed. The organic layer was dried over anhydrous sodium sulfate, the solvent was evaporated to dryness, and purified by silica gel chromatography to obtain compound 4.

[0048] ② Preparation of optical holographic materials

[0049] Add 2.8 ml of water to γ-glycidyloxypropyltrimethoxysilane (9.4 g, 0.04 mol) and ethyl orthosilicate (2 g, 0.01 mol), and adjust the pH to about 3 with hydrochloric ...

Embodiment 3

[0054] ①Synthesis of azobenzene unit

[0055] p-Methoxyaniline (6.2 g, 0.05 mmol) was added to a solution of 17 ml of concentrated hydrochloric acid (0.2 mol) and 10 ml of water, and stirred to mix well. Heat it with an oil bath to make the solution clear, then quickly put it into an ice-salt bath and stir to get good crystals. Keeping the temperature at 0-5°C, sodium nitrite (3.5 g, 0.05 mol) and 20 mol of water were added dropwise and stirred. After 30 minutes, an equal amount of urea was added to neutralize the remaining sodium nitrite, and the reaction progress was monitored by starch-potassium iodide test paper to obtain a diazonium salt solution. Phenol (4.9 g, 0.05 mol) was dissolved in 10% aqueous sodium hydroxide (4 g, 0.05 mol), and the mixture was cooled to below 10° C. with an ice bath, and then 20 g of ice was added. The above diazonium salt solution was slowly added dropwise, stirred rapidly for 1 h, and then a saturated sodium acetate solution was added to adj...

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Abstract

The invention discloses an azobenzol liquid crystal holography storage material and a preparation method thereof. The material comprises silicon dioxide, a compound containing azobenzol radical and a compound containing liquid crystal radical, wherein mol ratio of the azobenzol radical to the liquid crystal radical is 0.5-10:1. The substrate material used in the azobenzol liquid crystal holography storage material has a silicon dioxide structure with excellent high-transparency and low scattered power, has lower refractive index, and can obtain high modulation index of the refractive index when the substrate material is matched with a photorefractive compound with higher refractive index. Existence of the liquid crystal radical can reinforce the photorefractive effect generated by the azobenzol radical in light, and improve diffraction efficiency, thereby improving information storage capacity; and regular arrangement of the liquid crystal radical cannot be affected by thermal motion and non signal light, so that data storage time can be greatly prolonged. Cis-trans isomers of the azobenzol radical can be converted with each other under radiation of signal light and induce the arrangement of the liquid crystal radical, and data can be repeatedly erased and written.

Description

technical field [0001] The invention is a new material for data storage and its preparation technology. Background technique [0002] The world-wide storage demand is increasing at a rate of 75% per year, and the huge amount of information makes people have an almost endless pursuit of high-density, high-transmission data storage means. Although traditional storage technologies, such as magnetic storage, traditional optical disk storage, and semiconductor storage, are constantly improving, these storage methods are gradually approaching their physical limits. Permanently recorded CDs consist of a series of pits and grooves etched into the surface, rewritable CDs employ surface crystallization / amorphization of a thin amorphous layer in which information is digitally encoded and read optically. Magnetic disks also store digital information in the form of magnetic domains arranged differently on the surface of the magnetic medium. Data storage based on two-dimensional (2D) me...

Claims

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Application Information

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IPC IPC(8): G11B7/241C09K19/12C09K19/06
Inventor 王彪方园滕东东汪琨王传志黄卓垚
Owner SUN YAT SEN UNIV
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