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Method for controllably preparing nanometer compounds with core-shell structures on basis of adsorption driving force

A technology of nanocomposite and core-shell structure, which is applied in the field of controllable preparation of core-shell structure nanocomposite based on adsorption driving force, can solve the problem that it is difficult to realize the controllability and regulation of the core size, and achieves wide practical application value, dispersion Good sex and uniform appearance

Active Publication Date: 2018-04-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to achieve controllable adjustment of the kernel size
Therefore, for the preparation of core-shell structure ZIFs@mSiO with ZIFs as the core 2 Nanocomposites present many challenges

Method used

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  • Method for controllably preparing nanometer compounds with core-shell structures on basis of adsorption driving force
  • Method for controllably preparing nanometer compounds with core-shell structures on basis of adsorption driving force
  • Method for controllably preparing nanometer compounds with core-shell structures on basis of adsorption driving force

Examples

Experimental program
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preparation example Construction

[0031] Preparation of pure ZIF-8 nanoparticles

[0032] Take by weighing 8mmol zinc nitrate hexahydrate and dissolve in 100mL methanol solvent to form A solution; weigh excess (33mmol) 2-methylimidazole and dissolve in 100mL methanol solvent to form B solution; pour B solution into A solution, and Stirring was continued for 2 hours at a stirring speed of 400r / min to produce a stable precipitated sample, which was centrifuged, washed, and vacuum-dried at 40°C to finally obtain ZIF-8 nanoparticles.

[0033] Preparation of Cu-doped ZIF-8 (Cu-ZIF-8) Nanoparticles

[0034] Weigh 0.4mmol copper nitrate hexahydrate and 8mmol zinc nitrate hexahydrate and dissolve in 100mL methanol solvent to form A solution; weigh excess (33mmol) 2-methylimidazole and dissolve in 100mL methanol solvent to form B solution; pour B solution into into solution A, and continuously stirred for 2 hours at a stirring speed of 400r / min to produce a stable precipitated sample, which was centrifuged, washed, an...

Embodiment 1

[0036] Disperse the prepared 50mg ZIF-8 into 100mL water solvent (corresponding to 0% methanol-water mixed solution), add 5mL 0.1mol / L NaOH solution under stirring, adjust the pH to 8-10, weigh 0.2g CTAB and add Stir into the system for 5 minutes, add 1.2mL TEOS dropwise (control the dropping rate at 0.05mL / s), continue to stir for 5 minutes, let stand for 5 minutes, centrifuge, wash, and vacuum dry at 40°C to obtain a hollow core-shell structure ZIF-8@mSiO 2 Nanomaterials, the TEM images of the prepared samples are shown in figure 1 .

Embodiment 2

[0038] Disperse the prepared 50mg ZIF-8 into 100mL alcohol solvent (corresponding to 100% methanol-water mixed solution), add 5mL 0.1mol / L NaOH solution under stirring, adjust the pH to 8-10, weigh 0.2g CTAB and add Stir into the system for 5 minutes, add 1.2mL TEOS dropwise (control the dropping rate at 0.5mL / s), continue to stir for 5 minutes, let stand for 5 minutes, centrifuge, wash, and dry under vacuum at 40°C, separate from water-alcohol Add ZIF-8@mSiO with the same adsorption system and no bell-shaped structure 2 Core-shell nanomaterials to obtain a solid core-shell structure ZIF-8@mSiO 2 Nanomaterials, the TEM images of the prepared samples are shown in figure 2 .

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Abstract

The invention discloses a method for controllably preparing nanometer compounds with core-shell structures on the basis of adsorption driving force. The method includes carrying out adsorption and dispersion treatment on prepared ZIFs nanometer particles via different alcohol-water systems by the aid of porous structures and alcohol-water selective adsorption difference of the ZIFs nanometer particles, regulating systems by the aid of NaOH solution until the systems are weakly alkaline, catalytically hydrolyzing tetrabutyl orthosilicate to form mesoporous silicon dioxide on ZIFs surfaces and preparing ZIFs nanometer compounds coated by the mesoporous silicon dioxide by the aid of one-step processes under selective etching effects of weak alkali; allowing reaction products to stand still after reaction is completed, centrifuging and washing precipitates, and then drying the precipitates under vacuum conditions. Alcohol-water proportions can be adjusted and increased, accordingly, the sizes of inner cores of the nanometer compounds can be controllably adjusted by means of etching, and the bell-shaped core-shell structures with high specific surface areas can be formed. The method hasthe advantages that the nanometer compounds prepared by the aid of the method are good in dispersibility and hydrophilicity, uniform in morphology and particle size and high in medicine carrying ability, and the method includes simple processes and is high in repeatability.

Description

Technical field: [0001] The invention relates to the preparation technology and method of hydrophobic zeolite-like imidazolate metal-organic framework modified nanocomposites. Under the action of adsorption driving force, the core-shell structure zeolite-like imidazolate metal-organic framework-mesoporous dioxide is controllably synthesized Silicon (hereinafter referred to as ZIFs@mSiO 2 ) nanocomposites. Specifically, taking advantage of the porous structure of ZIFs nanoparticles and the difference in selective adsorption of alcohol-water, the prepared ZIFs nanoparticles are subjected to adsorption and dispersion treatment with different alcohol-water mixtures or a single component system. Under the action of sodium hydroxide (NaOH) solution to adjust the system to weak alkaline (pH = 8 ~ 10), catalytic hydrolysis of tetrabutyl silicate to form mesoporous silica on the surface of ZIFs, under the selectivity of weak base Mesoporous silica-coated ZIFs nanocomposites were prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00A61K31/704A61K47/04A61K47/34A61P35/00
CPCA61K31/704A61K47/02A61K47/34C08G83/008
Inventor 刘惠玉王伟伟孙晓潘雪婷申鹤云
Owner BEIJING UNIV OF CHEM TECH
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