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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: 2012-07-04
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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  • Preparation method for gold-shell magnetic ellipsoid

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specific Embodiment approach 1

[0024] 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 ferric perchlorate, sodium dihydrogen phosphate and urea in deionized water to obtain a homogeneous mixture, then transfer the homogeneous mixture to a polytetrafluoro reactor to seal it, and heat it at a temperature of 100°C to 140°C React at ℃ for 8h to 16h, then centrifuge at a centrifugal speed of 5000r / min to 7000r / min for 8min to 12min, and wash the solid obtained by centrifugation with deionized water at a centrifugal speed of 5000r / min to 7000r / min 2 to 5 times, single centrifugal washing time is 5min to 10min, and finally dried at a temperature of 40°C to 60°C until constant weight, that is, the spindle-shaped α-Fe 2 o 3 Particle; The mol ratio of ferric perchlorate described in step 1 and sodium dihydrogen phosphate is (20~25): 1; The concentration of ferric perchlorat...

specific Embodiment approach 2

[0035] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, ferric perchlorate, sodium dihydrogen phosphate and urea are first completely dissolved in deionized water to obtain a homogeneous mixed solution, and then the homogeneous mixed solution Transfer to a PTFE reactor and seal it, and react at a temperature of 110°C to 130°C for 10h to 14h, then centrifuge at a centrifugal speed of 5500r / min to 6500r / min for 9min to 11min, and centrifuge the obtained solid Use deionized water at a centrifugal speed of 5500r / min to 6500r / min for 2 to 5 centrifugal washes, and the time for a single centrifugal wash is 6min to 9min, and finally dry at a temperature of 45°C to 55°C until constant weight, that is, Get spindle-shaped α-Fe 2 o 3 particle. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step two, the spindle-shaped α-Fe is first 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 to 350r / min, and react at a stirring speed of 250r / min to 350r / min for 20h to 28h, and then centrifuge at a speed of 6500r / min to 7500r Centrifuge for 7min to 9min at 1 / min, and centrifuge the solid obtained by centrifugation for 3 to 6 times with deionized water at a centrifugal speed of 6500r / min to 7500r / min, and the time for a single centrifugal washing is 7min to 9min. Others are the same as in 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 three-dimensional photonic crystal of the opal structure is a three-dimensional periodic structure formed by close packing of submicron-sized monodisperse microspheres, and its lattice structure is a face-centered cubic lattice or a small amount of hexagonal lattice. When light waves propagate in photonic crystals, they are modulated by Bragg scattering to form a photonic band gap (PBG), and photons whose energy is within the photonic band gap will not be able to enter the photonic crystal. This characteristic of photonic crystals makes it widely used in the field of optics. Applications. [0003] According to theoretical calculations, in the face-centered cubic stacking structure composed of spherical structural units, the symmetry leads to the annexation of energy levels at the W- and U-points in the first Brillouin zone of...

Claims

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Application Information

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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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