a preparation fe 3 o 4 @pvp@pnipam magnetic photonic crystal nanochain particle approach

A magnetic photonic crystal and nanoparticle technology, applied in the direction of magnetic objects, magnetic materials, chemical instruments and methods, etc., can solve the problems of complex process, high equipment and environmental requirements, and achieve simple control method, wide range of brightness and chromaticity control , good controllability and repeatability

Active Publication Date: 2021-07-20
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

At present, the color control of magnetic photonic crystal nanochains is mainly realized by adjusting the size of the assembly unit, the strength of the external magnetic field, and the environmental stimulus. These methods have the disadvantages of complex processes, high requirements for equipment and the environment, and the development of a simple, efficient, and controllable The method of preparing photonic crystal nanochains with different colors is of great significance

Method used

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  • a preparation fe <sub>3</sub> o <sub>4</sub> @pvp@pnipam magnetic photonic crystal nanochain particle approach
  • a preparation fe <sub>3</sub> o <sub>4</sub> @pvp@pnipam magnetic photonic crystal nanochain particle approach
  • a preparation fe <sub>3</sub> o <sub>4</sub> @pvp@pnipam magnetic photonic crystal nanochain particle approach

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Using the method in the literature (Adv.Mater.2014,26,1058–1064) to prepare superparamagnetic iron ferric oxide colloidal nanoparticles, the specific steps are as follows:

[0045] 0.13 millimoles polyvinylpyrrolidone (PVP), 0.06 millimoles tannic acid are joined in the beaker that fills 30 milliliters of ethylene glycol, heated and stirred at 80 degrees for 15 minutes to PVP completely dissolving, above-mentioned solution is cooled to room temperature, to Add 2.6 mmoles of ferric chloride hexahydrate, stir for 30 minutes, add 34 mmoles of anhydrous sodium acetate, stir for 40 minutes, transfer the resulting solution to the lining of a 50 ml polytetrafluoroethylene reactor, put the lining in React in a stainless steel kettle at 200°C for 10 hours, wash with ethanol and water magnetic separation after cooling, and finally disperse the product in 20 ml of absolute ethanol for later use.

[0046] (2) Preparation of pre-polymerization liquid:

[0047] Get the ethanol s...

Embodiment 2

[0052] The same steps as in Example 1, but the amount of methylene bisacrylamide in the prepolymerization solution is 0.0041 g (that is, the ratio of the amount of methylene bisacrylamide to N-isopropylacrylamide is 0.01), and the final product is dispersed in ethanol . The scanning electron microscope picture, bright field microscope picture, spectrogram and dark field microscope picture of the obtained product are as follows: Figure 10 –13 shown. It can be seen from the scanning electron microscope and the bright field microscope that the obtained product is a well-dispersed nanochain. It can be seen from the spectrum that the diffraction peak of the obtained nanochain is 647 nm, and the intensity of the diffraction peak increases with the increase of the magnetic field intensity. According to the Bragg equation, the interchain spacing of the obtained nanochains is 88 nm. The obtained photonic crystal chains are red in color according to the microscopic picture.

Embodiment 3

[0054] The same steps as in Example 1, but the amount of methylene bisacrylamide in the pre-polymerization liquid is 0.041 g (that is, the ratio of the amount of methylene bisacrylamide to N-isopropylacrylamide is 0.1), and the final product is dispersed in ethanol . The spectrum, scanning electron microscope, bright field microscope and dark field microscope of the resulting product are shown in Figure 12 , 14–16. It can be seen from the topography that the obtained product is a well-dispersed nanochain, and from the spectrum, it can be seen that the diffraction peak of the obtained nanochain is 560 nm, and the intensity of the diffraction peak increases with the increase of the magnetic field intensity. According to the Bragg equation, the interchain spacing of the obtained nanochains is 56 nm. The resulting photonic crystal chains are shown in green by dark-field microscopy.

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Abstract

The invention relates to a method for regulating Fe 3 o 4 @PVP@PNIPAM A simple and controllable method for interparticle spacing of photonic crystal nanochains, by adjusting the concentration of polyacrylic acid aqueous solution or / and the ratio of methylene bisacrylamide to N-isopropylacrylamide in the reaction system Fe 3 o 4 @PVP@PNIPAM The particle distance of magnetic photonic crystal nanochains, the concentration of the polyacrylic acid aqueous solution is changed in the range of 0.33-1.09g / L, and the ratio of the amount of methylenebisacrylamide to N-isopropylacrylamide is between Change within the range of 0.01 to 0.1. Compared with the prior art, the present invention has the following advantages and positive effects due to the adoption of the above-mentioned technical scheme: 1) the method is simple, efficient, low in cost, good in controllability and repeatability, and is easy to promote in industrial applications . 2) Its brightness and chromaticity control range is wide, and the control method is simple and efficient.

Description

technical field [0001] The invention relates to the technical field of magnetic nanomaterials, in particular to a method for regulating Fe 3 o 4 @PVP@PNIPAM A facile and controllable approach to interparticle spacing of photonic crystal nanochains. Background technique [0002] Compared with traditional inorganic pigments and organic dyes, structural color has the advantages of environmental protection, energy saving, non-fading, and easy adjustment. It has important potential applications in the fields of visual sensing, display, anti-counterfeiting, and camouflage. Magnetic photonic crystals are an important Structural chromatic materials have attracted much attention due to their advantages such as simple preparation method, fast response rate, and reversible response. According to Bragg's law, the structural color of one-dimensional magnetic photonic crystal nanochains is mainly determined by its particle size and particle distance. 3 o 4 ) preparation of one-dimensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/54C08F222/38C08F2/44C08F2/48C08L33/24C08L39/06C08L33/02C08K3/22C09K9/00H01F1/00
CPCC08F2/44C08F2/48C08F220/54C08K2003/2275C08L33/02C08L33/24C08L39/06C08L2205/02C08L2205/03C09K9/00C09K2211/1466H01F1/0018H01F1/0054H01F1/0081C08F222/385C08K3/22
Inventor 官建国刘云马会茹陈继涛
Owner WUHAN UNIV OF TECH
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