A method for the preparation of hollow core-shell composites induced by non-synchronous shrinkage

Abstract

A method for preparing hollow core-shell composites induced by non-synchronous shrinkage. Disperse 9.0mL pyrrole into 480mL distilled water and stir evenly, then add 0.8g FeCl 2 ·4H 2 O is dissolved in the solution, and 40 mL of oxidant H is added while stirring. 2 O 2 , PPy microspheres can be obtained after 12 hours of reaction; disperse 0.4g PPy microparticles into a mixed solution of 400mL absolute ethanol, 100mL water and 10mL ammonia water. After ultrasonic for 30 minutes, add 1mL ethyl orthosilicate dropwise at room temperature. After 12 hours of reaction, wash with ethanol several times to obtain PPy@SiO 2 Microspheres; the obtained PPy@SiO 2 The microspheres were calcined at 700°C for 4 hours under nitrogen conditions in a tube furnace to obtain C@C@SiO 2 , and then the obtained C@C@SiO 2 0.8g of microspheres are dispersed into 150mL with a concentration of 1mol·L ‑1 In the KOH solution, stir for 24 hours at 45°C; after etching with KOH and washing with distilled water several times, hollow core-shell composite C@C microspheres can be obtained.

Description

technical field [0001] The invention relates to a method for preparing a hollow core-shell composite material through asynchronous shrinkage induction, and belongs to the technical field of methods for preparing hollow core-shell composite materials. Background technique [0002] With the continuous innovation of science and technology, nanomaterials are widely used in various fields, and the design of nanomaterial microstructure has become an important means to improve the performance of materials. Among various microstructures, hollow core-shell composites are the most widely used, such as lithium-ion batteries, catalysis, drug gene delivery systems, gas sensing and supercapacitors, etc. In recent years, this hollow core-shell structure material has also been applied in the field of electromagnetic wave absorption. This hollow core-shell composite material can effectively adjust the dielectric constant, optimize the impedance matching characteristics, realize multiple ref...

AI Technical Summary

Problems solved by technology

One technical difficulty of this method is that the surface of silica is relatively smooth, and it may be difficult for external materials to coat it. Generally, surface modification treatment is required, which makes the preparation process more cumbersome.

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