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Preparation method for gold-shell magnetic ellipsoid

An ellipsoid and magnetic technology, which is applied in the field of preparation of multi-layer core-shell structure ellipsoids, can solve the problems of low photothermal and photoelectric conversion efficiency, and achieve the effects of good conversion effect, improved monodispersity, and increased reaction rate.

Active Publication Date: 2013-06-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of low photothermal and photoelectric conversion efficiency in photonic crystals assembled from existing core-shell magnetic ellipsoids, and to provide a method for preparing a magnetic ellipsoid coated with a gold shell to improve light absorption. rate, improved optical performance

Method used

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specific Embodiment approach 1

[0024] Specific embodiment 1: This embodiment is a method for preparing a gold shell magnetic ellipsoid, which is specifically completed according to the following steps:

[0025] 1. First, completely dissolve iron perchlorate, sodium dihydrogen phosphate and urea in deionized water to obtain a homogeneous mixture, and then transfer the homogeneous mixture to a polytetrafluoroethylene reactor and seal it at a temperature of 100℃~140 Reaction at ℃ for 8h-16h, and then centrifuged at 5000r / min~7000r / min for 8min~12min, and the solid obtained by centrifugation is washed with deionized water at a centrifugal speed of 5000r / min~7000r / min 2 to 5 times, a single centrifugal washing time is 5min to 10min, and finally drying at a temperature of 40℃~60℃ until constant weight, that is, spindle-shaped α-Fe is obtained 2 O 3 Particles; the molar ratio of iron perchlorate and sodium dihydrogen phosphate described in step one is (20-25):1; the concentration of iron perchlorate in the uniform mix...

specific Embodiment approach 2

[0035] Embodiment 2: The difference between this embodiment and Embodiment 1 is: in step 1, ferric perchlorate, sodium dihydrogen phosphate and urea are completely dissolved in deionized water to obtain a homogeneous mixed solution, and then the homogeneous mixed solution Transfer to a Teflon reactor and seal, and react at 110℃~130℃ for 10h~14h, then centrifuge at 5500r / min~6500r / min for 9min~11min, and centrifuge the obtained solid Use deionized water at a centrifugal speed of 5500r / min~6500r / min for centrifugal water washing 2~5 times, a single centrifugal water washing time is 6min~9min, and finally drying at a temperature of 45℃~55℃ until constant weight, that is Get spindle-shaped α-Fe 2 O 3 particle. Others are the same as the first embodiment.

specific Embodiment approach 3

[0036] Specific embodiment three: this embodiment is different from specific embodiment one or two in that: in step two, the spindle-shaped α-Fe 2 O 3 The particles are dispersed in deionized water to obtain spindle-shaped α-Fe 2 O 3 Particle dispersion, then add polyvinylpyrrolidone at a stirring speed of 250r / min~350r / min, and react at a stirring speed of 250r / min~350r / min for 20h~28h, and then centrifuge at a speed of 6500r / min~7500r Centrifuge for 7min-9min at 1 / min, and centrifuge the solid obtained by centrifugation with deionized water at a centrifugal rotation speed of 6500r / min-7500r / min for 3-6 times, and the washing time for a single centrifugation is 7min-9min. Others are the same as the first or second embodiment.

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Abstract

The invention discloses a preparation method for a gold-shell magnetic ellipsoid and relates to a preparation method for a multi-layer nuclear shell structure ellipsoid. The preparation method is used for solving the problem that a photonic crystal assembled by the existing magnetic ellipsoid with the nuclear shell structure is low in photo-thermal conversion efficiency and photoelectric conversion efficiency. The preparation method comprises the following steps: 1. preparing a spindly alpha-Fe2O3 particle; 2. firstly obtaining alpha-Fe2O3 particle dispersing solution, and then adding polyvinylpyrrolidone for modification; 3. carrying out silicon dioxide coating to obtain a silicon dioxide coated ellipsoidal particle; 4. adding a poly dimethyl diallyl ammonium chloride aqueous solution and NaCl to prepare a silicon dioxide coated ellipsoidal aqueous solution adsorbing polyelectrolyte; 5. preparing a gold solution; 6. adding the gold solution into the silicon dioxide coated ellipsoidalaqueous solution adsorbing polyelectrolyte to obtain alpha-Fe2O3 / SiO2 / Au ellipsoidal particles; and 7. carrying out hydrogen reduction to obtain the Fe3O4 / SiO2 / Au ellipsoid. The preparation method ismainly used for preparing the gold-shell magnetic ellipsoid.

Description

Technical field [0001] The invention relates to a preparation method of a multilayer core-shell structure ellipsoid. Background technique [0002] The opal-structured three-dimensional photonic crystal is a three-dimensional periodic structure formed by densely packed monodisperse microspheres of submicron size, and its lattice structure is a face-centered cubic lattice or a small amount of hexagonal lattice. When a light wave propagates in a photonic crystal, it is modulated due to Bragg scattering to form a photonic band gap (PBG). Photons with energy in the photonic band gap cannot enter the photonic crystal. This characteristic of the photonic crystal makes it widely used in the optical field. Applications. [0003] According to theoretical calculations, in the face-centered cubic stacking structure composed of spherical structural elements, symmetry leads to the merger of W- and U- points in the first Brillouin zone of the three-dimensional photonic crystal, making a complete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B01J13/02C01G49/06C01G49/08
Inventor 赵九蓬张鑫李垚徐洪波
Owner HARBIN INST OF TECH
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