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Core-shell-structure photomagnetic double-function nano composite material and preparation method thereof

A technology of nanocomposite material and core-shell structure is applied in the field of preparation of core-shell structure multifunctional nanocomposite materials, and achieves the effects of wide design practicability, high product purity, and overcoming low fluorescence/magnetic intensity.

Inactive Publication Date: 2013-02-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, there are no reports or routes that have general significance and can be applied to different high-temperature pyrolysis methods to prepare high-performance optomagnetic functional nanocomposites.

Method used

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  • Core-shell-structure photomagnetic double-function nano composite material and preparation method thereof
  • Core-shell-structure photomagnetic double-function nano composite material and preparation method thereof
  • Core-shell-structure photomagnetic double-function nano composite material and preparation method thereof

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specific Embodiment approach ( 1

[0023] (1) Preparation of up-conversion fluorescent NaGdF by high-temperature pyrolysis 4 : Yb, Tm nanocrystalline core material. First, weigh a total amount of 1mmol rare earth oleate Gd(C 18 h 33 o 2 ) 3 , Yb(C 18 h 33 o 2 ) 3 and Tm(C 18 h 33 o 2 ) 3 , placed in a three-neck flask. Another 0.21 g NaF, 15 mL oleic acid and 15 mL octadecene were added. Heat up to 100°C and pass N 2 Air for 30 minutes. in N 2 Under air protection, the system was warmed up to 280°C, and kept warm for 2.5h. After the reaction was finished, it was naturally cooled until the temperature was reduced to 70° C., and ethanol was added to precipitate the product. Wash twice more with ethanol and cyclohexane. The product is stored in 5mL cyclohexane to obtain Yb and Tm co-doped NaGdF 4 (expressed as NaGdF 4 :Yb, Tm) nanocrystalline core material.

[0024] (2) Preparation of core-shell structure NaGdF by high temperature pyrolysis 4 :Yb,TmNaGdF 4 : Yb, Tm nanomaterials. The specif...

specific Embodiment approach ( 2

[0028] (1) Preparation of up-conversion fluorescent NaGdF by high-temperature pyrolysis 4 : Yb, Tm nanocrystalline core material. First, weigh a total amount of 0.8mmol rare earth oleate Gd(C 18 h 33 o 2 ) 3 , Yb(C 18 h 33 o 2 ) 3 and Tm(C 18 h 33 o 2 ) 3 , placed in a three-neck flask. Another 0.16 g NaF, 12 mL oleic acid and 12 mL octadecene were added. Heat up to 100°C and pass N 2 Air for 30 minutes. in N 2 Under air protection, the system was warmed up to 280° C. and kept for 1 h. After the reaction was finished, it was naturally cooled until the temperature was reduced to 70° C., and ethanol was added to precipitate the product. Wash twice more with ethanol and cyclohexane. The product is stored in 5mL cyclohexane to obtain NaGdF 4 : Yb, Tm nanocrystalline core material.

[0029] (2) Preparation of core-shell structure NaGdF by high temperature pyrolysis 4 :Yb,TmNaGdF 4 : Yb, Tm nanomaterials. The specific experimental steps are as follows: 0.16g N...

specific Embodiment approach ( 3

[0031] (1) Preparation of up-conversion fluorescent NaGdF by high-temperature pyrolysis 4 : Yb, Tm nanocrystalline core material. First, weigh a total amount of 1.2mmol rare earth oleate Gd(C) with a stoichiometric ratio of 80:17:3 18 h 33 o 2 ) 3 , Yb(C 18 h 33 o 2 ) 3 and Tm(C 18 h 33 o 2 ) 3 , placed in a three-neck flask. Another 0.25 g NaF, 18 mL oleic acid and 18 mL octadecene were added. Heat up to 100°C and pass N 2 Air for 30 minutes. in N 2 Under air protection, the system was warmed up to 280°C, and kept warm for 5h. After the reaction was finished, it was naturally cooled until the temperature was reduced to 70° C., and ethanol was added to precipitate the product. Wash twice more with ethanol and cyclohexane. The product is stored in 5mL cyclohexane to obtain NaGdF 4 : Yb, Tm nanocrystalline core material.

[0032] (2) Preparation of core-shell structure NaGdF by high temperature pyrolysis 4 :Yb,TmNaGdF 4 : Yb, Tm nanomaterials. The specific...

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Abstract

The invention provides a core-shell-structure photomagnetic double-function nano composite material and a preparation method thereof. The preparation method comprises the following steps: preparing an NaGdF4:Yb,Tm upconversion fluorescent nanocrystal nuclear material by high-temperature pyrolysis; coating an active upconversion fluorescent layer made of the same material on the surface of the NaGdF4:Yb,Tm upconversion fluorescent nanocrystal nuclear material by high-temperature pyrolysis; and coating an Fe3O4 magnetic shell on the surface of the core-shell structure by high-temperature pyrolysis to obtain the NaGdF4:Yb,Tm@NaGdF4:Yb,Tm@Fe3O4 core-shell-structure photomagnetic double-function nano composite material. The composite material provided by the invention has strong upconversion luminescence property and magnetic properties; and the middle active fluorescent layer enhances the fluorescence intensity, inhibits the quenching effect between the nuclear material and the strong-magnetism shell material, and improves the fluorescence of the finally prepared photomagnetic double-function composite material of which the particle size is only 20nm or so.

Description

technical field [0001] The invention relates to a multifunctional nanocomposite material with a core-shell structure, and also relates to a preparation method for the multifunctional nanocomposite material with a coreshell structure. Background technique [0002] In the past decade, multifunctional nanocomposites with unique magnetic and fluorescent properties have received great attention because of their promising applications in biomedical fields, such as sustained drug release carriers, diagnostic assays, and magnetic response imaging. , bioseparation and fluorescent labeling. Among them, the traditional fluorescent materials are mainly semiconductor nanocrystals and organic dye molecules. However, rare earth nanoluminescent materials, which have developed rapidly in the past ten years, have excellent properties such as large Stokes shift, narrow emission spectrum, long fluorescence lifetime, high chemical / photochemical stability, low toxicity and low photobleaching. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85C09K11/02H01F1/01
Inventor 杨飘萍盖世丽杨桂欣吕锐婵张圣欢牛娜贺飞
Owner HARBIN ENG UNIV
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