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Dendritic silicon dioxide@carbon dot compound nano-particle and preparation method thereof

A composite nanoparticle and silicon dioxide technology, applied in chemical instruments and methods, nanotechnology, nanotechnology and other directions, can solve the problem of high CDs loading, achieve the effect of simple and easy preparation method, improved utilization, and large yield

Inactive Publication Date: 2019-01-25
南京纳科伟业纳米技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a dendritic silica@carbon dot composite nanoparticle and a preparation method thereof. The method successfully prepares dendritic silica@carbon dot composite nanoparticle with high CDs loading, which not only solves the problem of CDs Due to the small size (below 10nm), it is not easy to stay in the organism, and the disadvantages such as high-concentration aggregation fluorescence quenching limit its application, and it retains the excellent fluorescence properties of CDs, especially because CDs are loaded on silica, making composite particles Convenient for centrifugation, which greatly optimizes and simplifies the post-processing steps of CDs in use

Method used

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  • Dendritic silicon dioxide@carbon dot compound nano-particle and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] (1) Preparation of dendritic silica nanoparticles

[0055] Add 68 mg of triethanolamine (TEA) to 25 mL of water, and continue stirring at 80°C for 30 minutes; add 380 mg of CTAB and 168 mg of sodium salicylate (molar ratio is 1:1), and stir for 1 hour; add 4 mL of tetraethyl orthosilicate, and stir at 80°C 2h; centrifuge at 12000r5min, wash twice with ethanol (Beijing Chemical Plant, analytically pure, 100%), centrifugally disperse in hydrochloric acid / methanol mixture (1:9 by volume); stir at 60°C for 6h, centrifuge, wash with water to obtain branches shaped silica nanoparticles. The dendritic silica nanoparticles can be dispersed in 100 mL of ethanol to obtain an ethanol dispersion of dendritic silica nanoparticles.

[0056] figure 1 The transmission electron microscope (TEM) and scanning electron microscope (SEM) photos of the obtained dendritic silica nanoparticles are shown, the results show that the dendritic silica nanoparticles are successfully prepared, and t...

Embodiment 2

[0062] (1) Preparation of dendritic silica nanoparticles (same as Example 1)

[0063] (2) Preparation of carbon dot nanoparticles (same as Example 1)

[0064] (3) Preparation of dendritic silica@carbon dot composite nanoparticles

[0065] Disperse dendritic silica nanoparticles obtained in (1) in an aqueous solution, add the aqueous dispersion of CDs obtained in (2), the concentration of dendritic silica nanoparticles is 5.5mol / L, and the concentration of CDs is 1.0×10 -1 mol / L. Use 1.0×10 -1 mol / L ammonia water to adjust the pH value of the solution to 14, then add 2.0×10 -4 mol / L 3-Aminopropyltrimethoxysilane. The resulting reaction mixture was reacted at 25° C. for 3 hours; finally centrifuged, separated, washed, and the obtained precipitate was dried to obtain dendritic silica@carbon dot composite nanoparticles.

Embodiment 3

[0067] (1) Preparation of dendritic silica nanoparticles (same as Example 1)

[0068] (2) Preparation of carbon dot nanoparticles (same as Example 1)

[0069] (3) Preparation of dendritic silica@carbon dot composite nanoparticles

[0070] The dendritic silica nanoparticles obtained in (1) are dispersed in aqueous solution, and the aqueous dispersion of CDs obtained in (2) is added, and the concentration of dendritic silica nanoparticles is 3.0×10 -4 mol / L, the concentration of CDs is 10mol / L. Use 1.0×10 - 1 mol / L ammonia water to adjust the pH value of the solution to 14, and then add 8.0×10 -7 mol / L3-Aminopropyltrimethoxysilane. The resulting reaction mixture was reacted at 25°C for 24 hours; finally centrifuged, separated, washed, and the obtained precipitate was dried to obtain dendritic silica@carbon dot composite nanoparticles.

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Abstract

The invention discloses a dendritic silicon dioxide@carbon dot compound nano-particle and a preparation method thereof. According to the preparation method, the dendritic silicon dioxide@carbon dot compound nano-particle can be successfully prepared; CDs capacity is high; the preparation method is simple in operation, high in yield and easy for large-scale production. The preparation method comprises the following steps: adding carbon dot into an aqueous dispersion of dendritic silicon dioxide nano-particle; regulating pH to 7.5-14, and then adding a silane coupling agent with an amino functional group, thereby acquiring a reaction mixture; reacting for 3-24 hours at 25-40 DEG C, thereby acquiring the dendritic silicon dioxide@carbon dot compound nano-particle. In the reaction mixture, theconcentration of dendritic silicon dioxide nano-particle is 3.0*10<-4>-5.5mol / L, the concentration of carbon dot is 1.0*10<-3>-10mol / L and the concentration of 3-amino propyl trimethoxy silane is 8.0*10<-7>-2.0*10<-4>mol / L.

Description

technical field [0001] The invention relates to the technical field of inorganic nanocomposite materials, in particular to a dendritic silica@carbon dot composite nanoparticle and a preparation method thereof. Background technique [0002] Carbon dots (CDs) have attracted extensive attention of scientists immediately upon their discovery due to their stable optical properties, water solubility, toxicity, biocompatibility, chemical inertness, and easy functionalization. CDs are a kind of spherical carbon particles with extremely small size (below 10nm), and their excellent properties make them expected to be used in many fields, such as biological imaging, medical diagnosis, catalysis, and optoelectronic devices. [0003] But CDs have encountered some technical difficulties in biomedical applications. The most prominent problem is the light weight. The size of CDs is very small (usually less than 10nm), and the main composition is carbon. The mass difference between CDs and ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65C09K11/59B82Y30/00B82Y40/00G01N21/64
CPCB82Y30/00B82Y40/00C09K11/02C09K11/592C09K11/65G01N21/643
Inventor 周丽丽
Owner 南京纳科伟业纳米技术有限公司
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