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Organic/inorganic nano composite luminescent hydrogel based on layered hydroxide and preparation method thereof

A layered hydroxide and inorganic nanotechnology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems that hydrogels do not have luminescent properties, achieve high quantum yield, wide luminous range, and long luminescent life Effect

Inactive Publication Date: 2017-03-29
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Layered double hydroxides, which are similar in structure to layered rare earth hydroxides, have been used to prepare nanocomposite hydrogels with ultrahigh mechanical properties [Z. Hu, et al , Adv. Mater.,26, 5950 (2014); L. Y. Wu, et al , Soft Matter, 11, 9038 (2015)], but this hydrogel does not have luminescent properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) One-step co-precipitation method to prepare layered rare earth hydroxides containing a single rare earth element: Gd(NO 3 ) 3 ×6H 2 O or Tb(NO 3 ) 3 ×6H 2 O or Eu(NO 3 ) 3 ×6H 2 O Any aqueous solution (0.2 mol L -1 ) and 0.25 mol L -1 Aqueous NaOH solution was simultaneously added dropwise to NaNO 3 Aqueous solution (1 mol L -1 ), carefully adjust the pH of the mixed solution to about 6.9. The water used is freshly boiled and cooled pure water. After the dropwise addition, the mixture was stirred at room temperature for 30 min, then aged at 75 °C for 24 h, and the whole reaction was carried out under N 2 in the atmosphere. The obtained solution was centrifugally washed with water for more than 3 times, and freeze-dried to obtain layered rare earth hydroxides containing only Gd, layered rare earth hydroxides containing only Tb, and layered rare earth hydroxides containing only Eu;

[0025] (2) Exfoliate and disperse a certain amount of layered rare eart...

Embodiment 2

[0032] According to the method and steps described in Example 1, only the layered rare earth hydroxide containing two rare earth elements is prepared in step (1), and the hexahydrate selected is Gd(NO 3 ) 3 ×6H 2 O or Tb(NO 3 ) 3 ×6H 2 O or Eu(NO 3 ) 3 ×6H 2 Any two substances in O, what is obtained is a layered rare earth hydroxide containing any two rare earth elements of Gd, Tb and Eu. The finally obtained nanocomposite hydrogel was placed under a 365 nm ultraviolet lamp, and the nanocomposite hydrogel containing two rare earth elements, Gd and Tb, was green, and the same content as the nanocomposite hydrogel containing only Tb rare earth element Compared with the darker color, the nanocomposite hydrogel containing Gd and Eu two rare earth elements is blue-purple, while the nanocomposite hydrogel containing Tb and Eu two rare earth elements, according to the different Eu content (0-1) , showing different colors such as green, yellow-green, yellow, orange, orange-red...

Embodiment 3

[0034] According to the method and steps described in Example 1, only the layered rare earth hydroxide containing three rare earth elements is prepared in step (1), and the hexahydrate selected is Gd(NO 3 ) 3 ×6H 2 O, Tb(NO 3 ) 3 ×6H 2 O and Eu(NO 3 ) 3 ×6H 2 O three kinds of substances, in which the ratio of Gd to the total rare earth elements is fixed at 0.5, and the ratio of Eu to the total rare earth elements is 0~0.5 (excluding 0 and 0.5), the obtained is three kinds of materials containing Gd, Tb and Eu Layered rare earth hydroxides of rare earth elements. The final nanocomposite hydrogel was placed under a 365 nm ultraviolet lamp, and it showed different colors such as green, yellow-green, yellow, yellow-orange, orange, red and blue-purple according to the content of Eu.

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Abstract

The invention relates to organic / inorganic nano composite luminescent hydrogel based on layered hydroxide and a preparation method thereof, and in particular relates to nano composite luminescent hydrogel with layered rare earth hydroxide as an inorganic component and polyacrylamide as a gel matrix and a preparation method thereof. The layered rare earth hydroxide is prepared by adopting the traditional one-step co-precipitation method, a high-concentration amino acid liquid strips the layered rare earth hydroxide into single nano sheets, sodium salicylate is introduced as a photosensitizer, an acrylamide monomer is added at low temperature, and in-situ free radical polymerization is carried out, so that the nano composite hydrogel with an excellent luminescent property is prepared. According to the invention, by regulating the components of the layered rare earth hydroxide, the content of the layered rare earth hydroxide and the excitation wavelength and by virtue of an energy transfer process between the photosensitizer and rare earth elements, nano composite hydrogel capable of emitting polychromatic light is provided, and a new easy-to-operate preparation method of the green and pollution-free nano composite hydrogel with an excellent luminescent property is provided.

Description

technical field [0001] The invention belongs to the field of organic / inorganic nanocomposite hydrogels, in particular to an organic / inorganic nanocomposite luminescent hydrogel based on layered hydroxides and a preparation method thereof. Background technique [0002] Nanocomposite hydrogel is a unique micro-network structure composed of uniformly dispersed inorganic nanoparticles and cross-linked flexible polymer chains, which has excellent mechanical properties [K. Haraguchi, et al , Adv. Mater., 18, 2250(2006)]. In addition to the widely studied clays, the nanoparticles involved are graphene oxide, layered double hydroxides, etc. Recent researchers' work mainly focuses on improving the mechanical properties of nanocomposite hydrogels, and there are few studies on nanocomposite hydrogels with luminescent properties. The property of endowing nanocomposite hydrogels with photofunctionality is also very important for expanding the application of nanohydrogels. [0003] Lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F2/44C08K9/04C08K3/22C08K5/098C09K11/78
CPCC08F120/56C08F2/44C08K3/22C08K5/098C08K9/04C08K2003/221C08K2201/011C09K11/7783
Inventor 陈光明吴连英李志波高彩艳
Owner INST OF CHEM CHINESE ACAD OF SCI
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