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Method for preparing functional modified hollow mesoporous or core/shell mesoporous silicon dioxide nanometer granules

A nanoparticle and gold nanoparticle technology, applied in the field of nanomaterials, can solve the problems of cumbersome process and difficult adjustment of the particle size of gold nanoparticles.

Inactive Publication Date: 2012-07-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The catalytic research of gold nanoparticles has been studied for many years. In order to make them have good toxicity resistance and recyclability, many researches using gold nanoparticles as catalysts are based on the traditional gold nanoparticles as the core and then coated with a layer. Shell, its disadvantage is that in the heterogeneous structure formed, gold nanoparticles are usually pre-synthesized, and the particle size of gold nanoparticles is not easy to control; and this method is cumbersome and uses a strong reducing agent

Method used

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  • Method for preparing functional modified hollow mesoporous or core/shell mesoporous silicon dioxide nanometer granules
  • Method for preparing functional modified hollow mesoporous or core/shell mesoporous silicon dioxide nanometer granules
  • Method for preparing functional modified hollow mesoporous or core/shell mesoporous silicon dioxide nanometer granules

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Experimental program
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Embodiment 1

[0041] Preparation of Amino-functionalized Hollow Mesoporous SiO 2 Ball: Mix 71.6 mL of absolute ethanol, 10 mL of deionized water and 3.14 mL of ammonia water, stir at 30°C for 30 min; quickly add 6 mL of tetraethyl orthosilicate, and magnetically stir for 40 min; Ethyl ester and 2 mL of 3-aminopropyltrimethoxysilane were uniformly mixed, then quickly added to the above solution, stirred magnetically for 80 min, and the product was centrifuged to obtain highly dispersed homogeneous solid core / shell mesoporous SiO 2 nanospheres. The centrifuged product is dispersed with 0.6 mol / L Na 2 CO 3 in solution. The dispersed sol was stirred at 80 °C for 30 min. After centrifugation, the product was washed three times with deionized water and freeze-dried.

Embodiment 2

[0043] According to the synthesis process of Example 1, the homogeneous solid core / shell mesoporous SiO was first obtained 2 nanospheres. The centrifuged product was dispersed in 0.6 mol / L Na 2 CO 3 solution and treated at 80°C for 8 min. Subsequent processing was as in Example 1. Preparation of homogeneous core / shell mesoporous SiO with hybrid shell pore size expansion 2 nanoparticles.

Embodiment 3

[0045] According to the synthesis process of Example 1, 60 ml of absolute ethanol and 20 ml of ammonia water (28wt%) were stirred and mixed evenly at 30°C, and 20 ml of a mixture of TEOS and absolute ethanol with a volume ratio of 18:2 was added, reacted for 20 min, and then Add 4 ml TEOS and absolute ethanol with a volume ratio of 19:1 to N-[3-(trimethoxysilyl)propyl]ethylenediamine N-[3-(trimethoxysilyl)propyl) dropwise, respectively. ]Ethylenediamine mixed solution, reacted for 2h, and the product was centrifuged to obtain highly dispersed homogeneous solid core / shell mesoporous SiO 2 nanospheres. If the preparation of long-chain amino-functionalized hollow mesoporous SiO 2 Subsequent treatment of nanomaterials is as in Example 1; if long-chain amino functionalized homogeneous core / shell mesoporous SiO is prepared 2 Nanoparticle material, subsequent processing is as embodiment 2.

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Abstract

The invention relates to a method for preparing functional modified hollow mesoporous or core / shell mesoporous SiO2 nanometer granules. The method comprises the following steps of: (1) synthesizing, namely mixing a silane coupling agent with long-chain functional groups and a silicon source uniformly, adding the mixture into an alkaline solution containing monodisperse SiO2 nanometer particles, and performing centrifugal separation on a reaction product to prepare solid core / shell mesoporous SiO2 nanometer spheres; and (2), dispersing the solid core / shell mesoporous SiO2 nanometer spheres prepared in the synthetic process in the alkaline solution, and performing hydro-thermal reaction to obtain the functional modified hollow mesoporous or core / shell mesoporous SiO2 nanometer granules. According to the method, the synthesis and functional modification of the hollow or core / shell mesoporous SiO2 nanometer granules can be implemented synchronously by the process. By the process for synthesizing the functional hollow or core / shell mesoporous SiO2 spheres 'synchronously', the blockage of pore channels in shells by a post modification method is avoided, and the process is simple and easy, pollution-free, high in yield, low in cost and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a hollow or core / shell structure mesoporous SiO with controllable particle size, monodispersity, large aperture and uniform size. 2 The preparation of spheres and the simultaneous realization of functional modification of different functional groups. Background technique [0002] Since 1992 MCM-41 mesoporous SiO 2 Since molecular sieves were synthesized by Mobil scientists, mesoporous SiO2 materials have shown broad application prospects in chemical catalysis, medicine, nanobiotechnology and other fields due to their high specific surface area, large pore volume, and uniform pore structure. Especially hollow mesoporous SiO 2 Nanoparticles, one of the most practical carriers, can be widely used in the fields of catalysis, adsorption, separation and targeted delivery of drugs. However, relevant modifications must be carried out for these applications, and the current modific...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y40/00B22F9/24B22F1/02
Inventor 张坤陈航榕施剑林陈雨王霞马明
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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