Fluorescent mesoporous inorganic oxide nanoparticles with core-shell structure and preparation method thereof

A technology of inorganic oxides and nanoparticles, applied in chemical instruments and methods, dyeing organosilicon compound treatment, nanotechnology for materials and surface science, etc., can solve the difficulty of controlling and restricting the shape and particle size distribution of nanoparticles Application and development, shell structure reunion and other issues, to achieve good light absorption capacity, good fluorescence performance, easy to repeat the effect

Inactive Publication Date: 2018-05-29
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the synthesis process, problems such as agglomeration and uneven wrapping may occur in the shell structure, making it difficult to control the morphology and particle size distribution of the prepared nanoparticles, which restricts the further application and development of such materials.

Method used

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  • Fluorescent mesoporous inorganic oxide nanoparticles with core-shell structure and preparation method thereof
  • Fluorescent mesoporous inorganic oxide nanoparticles with core-shell structure and preparation method thereof
  • Fluorescent mesoporous inorganic oxide nanoparticles with core-shell structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1～4

[0035] The core-shell fluorescent mesoporous silica nanoparticles whose cores are dense silica nanoparticles were prepared by a mild and improved Stober method. Taking the sample whose fluorophore is biphenyl as an example, the specific preparation process is as follows:

[0036] 1) Preparation of dense silicon oxide core nanoparticles: Ammonia water (2.56 mL) and tetraethyl orthosilicate (TEOS, 1.42 mL) were added into absolute ethanol (33 mL) and reacted for 24 hours. The reaction solution was centrifuged and washed several times with absolute ethanol and secondary water, and the product filter cake was collected and vacuum-dried at room temperature to obtain the target nanoparticles;

[0037] 2) Preparation of core-shell silica nanoparticles: the above-mentioned silica nanoparticle core (200mg) was suspended in a mixed solution of absolute ethanol (18mL) and secondary water (41mL), ultrasonically dispersed for 20 minutes, and ammonia water (0.7 mL), then add the pre-prepare...

Embodiment 5-7

[0042] The core-shell fluorescent mesoporous silica nanoparticles whose core is iron oxide nanoparticles are also prepared by a mild modified Stober method. Taking the sample whose fluorophore is biphenyl as an example, the specific preparation process is as follows:

[0043] 1) Preparation of dense iron oxide nanoparticles: FeCl 3 .6H 2 O (0.85g), citric acid (0.48g), and sodium acetate (1.75g) were added to ethylene glycol (30mL), stirred for several hours, transferred to a hydrothermal kettle, reacted at 200°C for 10 hours, cooled to room temperature, and obtained The black nanoparticles were washed several times with absolute ethanol and deionized water, and dispersed in ethanol.

[0044] 2) Preparation of core-shell inorganic nanoparticles: 10 mL of the ferric oxide nano particle solution prepared above was added to 30 mL of deionized water, then CTAB (40 mg) was added, ammonia water (0.2 mL), TEOS ( 100 μL) and double-headed biphenyl silicon source (10 μL). After react...

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Abstract

The invention discloses a core-shell-structured fluorescent mesoporous inorganic oxide nanoparticle and a preparation method thereof. The fluorescent mesoporous inorganic oxide nanoparticle is of a core-shell structure, wherein the core is a small compact solid ball and a silicon oxide, iron oxide or manganese oxide inorganic nanoparticle, and the shell is an organic fluorescent group-modified mesoporous structure. The organic fluorescent group of the shell is an organic fluorescent double-end silicon source structure which is as shown in (R'O)3Si-R-Si(R'O)3, wherein R' is a C1-4 alkyl group, and R is fluorophore. The preparation method for the core-shell-structured fluorescent mesoporous inorganic oxide nanoparticle comprises the following three steps: 1) preparation of the inorganic oxide inorganic nanoparticle; 2) preparation of core-shell-structured oxide nanoparticle; and 3) removal of a mesoporous channel template in the shell. The invention has the following beneficial effects: the nanoparticle has structured morphology and good monodispersion; a skeleton is modified by organic fluorophore and has controllable fluorescence properties; and reaction conditions are mild, and preparation is simple and can be easily repeated.

Description

technical field [0001] The invention belongs to the technical field of advanced nanometer materials, and specifically relates to a novel core-shell fluorescent mesoporous inorganic oxide nanoparticle with regular appearance and good monodispersity and a preparation method thereof. Background technique [0002] Due to its high specific surface area, high brightness and other characteristics, fluorescent silicon oxide materials have good applications in the fields of sensors, drug tracers and biological imaging. However, at present, the fluorescent functional groups of most fluorescent nanoparticles are introduced into the surface or pores of the particles by deposition, loading or grafting, which reduces the utilization of the pores of the nanoparticles and easily causes dye bleeding. Leakage not only reduces the fluorescence properties of the particles, but also limits their application in the biological field, especially in the field of drug carriers. At the same time, as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C09C1/28C09C1/24C09C3/12B82Y30/00B82Y20/00
CPCB82Y20/00B82Y30/00C09C1/24C09C1/28C09C3/12C09K11/06
Inventor 卢德力韩生黄奇喻宁波仁济夫戴愈攻何慧红张金龙
Owner SHANGHAI INST OF TECH
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