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Fluorescent microcapsule and preparation method thereof

A microcapsule and fluorescence technology, applied in the directions of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problem that there is no research report on graphene quantum dots, and achieve good biocompatibility, fluorescence and luminescence stability. Good, simple preparation method

Active Publication Date: 2018-01-19
赫聪
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there is no research report on the use of graphene quantum dots as a material for the preparation of microcapsule walls.

Method used

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  • Fluorescent microcapsule and preparation method thereof
  • Fluorescent microcapsule and preparation method thereof
  • Fluorescent microcapsule and preparation method thereof

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Embodiment 1

[0027] 1. Preparation of fluorescent microcapsules

[0028] In this embodiment, the spherical core particle is a negatively charged spherical calcium carbonate core with a particle size of 4 μm, the cationic polyelectrolyte is polydiallyldimethylammonium chloride (PDDA), and negatively charged graphene quantum dots (GQDs ) is synthesized by a bottom-up method in the prior art, using 1,3,6-trinitropyrene as a carbon source and sodium hydroxide as a reaction medium (see Nature Communication, 2014, 5, 5357).

[0029] The layer-by-layer electrostatic self-assembly process of PDDA and negatively charged GQDs on the core material is as follows: at 25 °C, 10 mg of spherical calcium carbonate cores with a particle size of 4 μm were uniformly dispersed in 10 mL of positively charged GQDs with a concentration of 1.0 mg / ml. Assemble in PDDA solution, the assembly time is 30min, centrifuge to remove the supernatant, wash / centrifuge the particles twice with water, the first layer of assemb...

Embodiment 2

[0036] 1. Preparation of fluorescent microcapsules

[0037] In this embodiment, the spherical core particles are negatively charged polystyrene balls with a particle size of 2 μm, the cationic polyelectrolyte is dendritic polyethyleneimine (PEI), and the negatively charged graphene quantum dots (GQDs) are obtained by prior art Synthesized in a top-down method, using carbon black as a carbon source, and cleaved with hot nitric acid (see Journal of Materials Chemistry, 2012, 22, 8764).

[0038] The layer-by-layer electrostatic self-assembly process of PEI and negatively charged GQDs on the core material was as follows: 15 mg of polystyrene spheres with a particle size of 2 μm were uniformly dispersed in 10 mL of positively charged GQDs at a concentration of 0.8 mg / ml at 25 °C. The assembly time is 20min in PEI solution, the supernatant is removed by centrifugation, the microparticles are washed / centrifuged three times with water, and the first layer of assembly is completed; the...

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Abstract

The invention discloses a fluorescent microcapsule and a preparation method thereof. According to the invention, polyelectrolyte and graphene quantum dots are used as capsule wall materials; and through layer-by-layer electrostatic self-assembly of cationic polyelectrolyte and electronegative graphene quantum dots, the fluorescent microcapsule is prepared. Based on fluorescence radiation characteristic and good biocompatibility of graphene quantum dots, the fluorescent microcapsule with advantages of simple preparation method, good fluorescence radiation stability and good biocompatibility canbe prepared. The technical problem that a capsule can be endowed with the fluorescent property only through complex fluorescent derivation of capsule wall materials in the prior art is solved.

Description

technical field [0001] The invention relates to the field of functional micro-nano materials, in particular to a fluorescent microcapsule and a preparation method thereof. Background technique [0002] Since scientists obtained microcapsules by alternating layer-by-layer (LBL) assembly on colloidal templates and removing the colloidal core in 2000, microcapsules have become widely studied materials for more than 20 years. In recent years, the research on functional microcapsules has been very active. Scientists have prepared microcapsules containing a variety of functionalized units, such as nanoparticles (SiO 2 Nanoparticles, Magnetic Nanoparticles, Gold Nanoparticles, Silver Nanoparticles, Carbon Nanotubes, Polymers (Dendrimers, Coordination Polymers, pH Responsive Polymers, Redox Polymers), Prussian Blue, and Biomacromolecules (DNA, peptide, protein) functional microcapsules. [0003] In general, the shape and size of microcapsules can be precisely controlled by the tem...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65B82Y30/00B82Y40/00B01J13/02
Inventor 刘吉洋和静博黄洁项雨倩
Owner 赫聪
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