Preparation method of monodisperse core-shell particles capable of being magnetically assembled into high-color saturation photonic crystals in oleoresin

A technology of oleoresin and photonic crystals, which is applied in the field of preparation of monodisperse core-shell particles, can solve the problems of magnetochromism and other problems

Pending Publication Date: 2021-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the shell substances have a greater affinity for water, they generally can only be magnetochromic in a small number of highly polar hydrophilic solutions or monomers, but cannot be used in most oily polymers with lower polarity. Magnetochromism in monomers or resins, such as most oil-based acrylates, epoxies, polyurethanes, etc.

Method used

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  • Preparation method of monodisperse core-shell particles capable of being magnetically assembled into high-color saturation photonic crystals in oleoresin
  • Preparation method of monodisperse core-shell particles capable of being magnetically assembled into high-color saturation photonic crystals in oleoresin
  • Preparation method of monodisperse core-shell particles capable of being magnetically assembled into high-color saturation photonic crystals in oleoresin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) The magnetic particles (made of FeO x Inner core and polyvinylpyrrolidone coated on the surface of the inner core) (particle size is 100nm) dispersed into bisphenol A glycerol dimethacrylate, photoinitiator 2-hydroxyl-2-methyl-1-benzene A pre-polymerization liquid is formed in a dispersion medium composed of methyl acetone (HMPP), dimethyl sulfoxide and water. The concentration of bisphenol A glycerol dimethacrylate in the pre-polymerization liquid is 0.05mmol / ml, and the concentration of HMPP is bis 3% of the molar weight of phenol A glycerol dimethacrylate, the concentration of the magnetic particles in the prepolymer solution is 0.5 mg / ml, and the molar ratio of dimethyl sulfoxide to water is 8.5:1.5;

[0030] (2) Pour the pre-polymerization solution into a three-necked flask, insert a stirring paddle, adjust the stirring speed to 50 rpm, and irradiate with ultraviolet light for 4 minutes. After the reaction, the prepared core-shell magnetic particles are centrif...

Embodiment 2

[0034] (1) The magnetic particles (made of Fe (1-y) co y o x Inner core and polyvinylpyrrolidone coated on the surface of the inner core) (particle size: 120nm) dispersed into pentaerythritol triacrylate, N, N-dibutylaniline (DBAN), lauramide peroxide (LPO), n-butyl Alcohol and benzyl alcohol form the pre-polymerization solution in the dispersion medium, and join in the there-necked flask, the concentration of pentaerythritol triacrylate in the pre-polymerization solution is 1mmol / ml, the concentration of LPO is pentaerythritol triacrylate 0.5%, the concentration of DBAN 1% pentaerythritol triacrylate, the concentration of magnetic particles in the prepolymerization solution is 5 mg / ml, and the molar ratio of n-butanol to benzyl alcohol is 8:2;

[0035] (2) The pre-polymerization solution adopts the method of heat-induced polymerization, inserts the stirring paddle, adjusts the rotation speed to 150 rpm, and raises the oil bath heating temperature to 50 degrees Celsius, and ...

Embodiment 3

[0039] (1) The magnetic particles (made of Fe (1-y) Ni y o x Inner core and polyvinylpyrrolidone coated on the surface of the inner core) (particle size: 150nm) dispersed into glycerol dimethacrylate, cyclohexanone peroxide, cyclocobaltate, diethylene glycol monomethyl ether and water A pre-polymerization liquid is formed in the dispersed medium, the concentration of glyceryl dimethacrylate in the pre-polymerization liquid is 1.5mmol / ml, and the concentration of cyclohexanone peroxide and cyclocobaltate is 0.5% of glyceryl dimethacrylate and 0.1%, the concentration of magnetic particles in the pre-polymerization solution is 5mg / ml, and the molar ratio of diethylene glycol monomethyl ether to water is 9:1;

[0040] (2) The pre-polymerization solution adopts the method of thermally induced polymerization, inserts a stirring paddle, adjusts the rotating speed to 200 rpm, and reacts at room temperature. After the reaction, the prepared core-shell magnetic particles are centrifug...

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Abstract

The invention relates to the field of photonic crystal materials, in particular to a preparation method of monodisperse core-shell particles capable of being magnetically assembled into high-color saturation photonic crystals in oleoresin. The method comprises the following steps: (1) uniformly mixing magnetic particles with an oily polymerizable shell raw material, an initiator and a dispersion medium solvent to obtain a pre-polymerized solution; and (2) initiating polymerization of the pre-polymerization liquid in at least one mode of stirring light curing, stirring heat curing or magnetic heat, so that the polymer coats the surfaces of the magnetic particles. Compared with existing similar products, the monodisperse core-shell particles capable of achieving magneto-discoloration in the oleoresin are prepared through stirring photocuring or stirring thermocuring or a magnetocaloric method, the problem that the peak width of a magnetic photonic crystal material in the oleoresin is too large is solved, the monodisperse core-shell particles can serve as filler to be dispersed in the oleoresin, structural colors with high color saturation are diffracted under the action of different external magnetic fields, and the narrowest half-peak width of a diffraction spectrum can be below 30nm.

Description

technical field [0001] The invention relates to the field of photonic crystal materials, in particular to a method for preparing monodisperse core-shell particles that can be magnetically assembled into photonic crystals with high color saturation in oleoresin. Background technique [0002] Due to its unique periodic structure, one-dimensional magnetic photonic crystals can produce bright structural colors under the action of light refraction or diffraction and an external magnetic field. While changing the strength of the applied magnetic field, the lattice spacing of the magnetic nano-core-shell particles dispersed in the liquid will change accordingly, thereby diffracting structural colors of different wavelength bands. And its shell-core structure with a diameter of nanometer level is conducive to improving the modulation resolution of photonic crystals to light. In addition, this magnetic nano-core-shell particle is easy to manufacture and has high color saturation, so...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F271/02C08F222/14C08F222/20
CPCC08F292/00C08F271/02C08F222/103C08F222/102
Inventor 官建国蒲宇洋罗巍马会茹
Owner WUHAN UNIV OF TECH
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