A kind of dual-optical property smart material, preparation method and application thereof
A smart material, dual optics technology, applied in the field of materials
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[0023] The present invention also provides a method for preparing the above-mentioned smart material with dual optical properties, comprising the following steps:
[0024] A) In the presence of a catalyst, add tetraethyl orthosilicate dropwise to the modified dispersion of iron-containing nanoparticles to react, and the iron-containing nanoparticles are non-spherical;
[0025] B) Calcining the reaction product obtained in step B) under a reducing atmosphere to obtain a magnetic substance;
[0026] C) Dispersing the magnetic substance in a solvent to obtain a smart material with dual optical properties.
[0027] Firstly, in the presence of a catalyst, tetraethyl orthosilicate is added dropwise to the dispersion liquid of the modified iron-containing nanoparticles, and the reaction is carried out, and the iron-containing nanoparticles are non-spherical.
[0028] Wherein, the iron-containing nanoparticles are selected from α-Fe 2 o 3 nanoparticles or FeOOH nanoparticles.
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Embodiment 1
[0056] 1. Preparation of FeOOH: 1.623 g of FeCl 3 ·6H 2 O water was dissolved in 120 ml of deionized water, then added to a three-necked flask and heated at 90 °C for 4 hours. FeOOH nanorod particles with a size of 150 nm in long axis and 40 nm in short axis can be obtained. The particles are collected by centrifugation, washed 3 times with water, and dispersed in 12 ml of water to obtain about 120 mg of FeOOH nanorod particles.
[0057] 2. Modification of FeOOH and coated silica: 1 ml of PAA with a concentration of 7.2 mg / ml was added to 20 ml of water, and then dispersed in ultrasonic, and then 30 mg of FeOOH solution dissolved in 3 ml of water was dispersed in and stirred at room temperature for 12 hours. Afterwards, the nanorods were collected by a centrifuge, and the FeOOH nanorods were redispersed in 3 ml of water. Next, PAA-modified FeOOH dispersed in 3 mL of water was added to 20 mL of ethanol, followed by the addition of 1 mL of ammonium hydroxide (~28% wt) in soni...
Embodiment 2
[0065] 1. Preparation of FeOOH: 1.623 g of FeCl 3 ·6H 2 O water was dissolved in 120 ml of deionized water, then added to a three-necked flask, and HCl was added to adjust the pH of the reaction solution to 1.5, then stirred and heated to 90°C for 4 hours. The particles were collected by centrifugation, washed well 3 times with water, and dispersed in 12 ml of water. FeOOH nanorod particles with a long axis of 165nm and a short axis of 25nm can be obtained
[0066] 2. FeOOH modification and coated silica: Usually, add 1 ml of PAA (7.2 mg / ml) to 20 ml of water to disperse in ultrasonic, then disperse 3 ml of FeOOH solution in it and stir at room temperature 12 hours. Afterwards, the nanorods were collected by a centrifuge, and the FeOOH nanorods were redispersed in 3 ml of water. Next, PAA-modified FeOOH dispersed in 3 mL of water was added to 20 mL of ethanol, followed by the addition of 1 mL of ammonium hydroxide (~28% wt) in sonication, and three minutes later, 100 μL of...
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