Method for preparing gradient-controllable colloidal photonic crystal

A colloidal photonic crystal and gradient technology, applied in the field of materials, can solve problems such as difficulty in obtaining photonic modes, and achieve the effect of simple operation and good stability

Inactive Publication Date: 2013-12-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In photonic crystal structures, the acquisition of photonic modes with low group velocities is more difficult due to the higher reflectivity and impedance mismatch of propagation modes due to lower group velocities

Method used

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  • Method for preparing gradient-controllable colloidal photonic crystal
  • Method for preparing gradient-controllable colloidal photonic crystal
  • Method for preparing gradient-controllable colloidal photonic crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of hydrophilic silicon wafers

[0027] The silicon wafer used is a single crystal silicon wafer (100), and the silicon wafer is cut to a size of 4cm long and 3cm wide with a glass knife, and is placed in a mixed solution of concentrated sulfuric acid (98% by mass) and hydrogen peroxide (30% by mass). (The volume ratio is 7:3) in a water bath and heated to 80°C for 5 hours to obtain a hydrophilic silicon wafer; then pour the mixed solution into a waste liquid bottle, and repeatedly wash the obtained hydrophilic silicon wafer with deionized water 3~5 times, keep in deionized water for later use.

Embodiment 2

[0028] Example 2: Purification of monomers and initiators

[0029] Put styrene and 10wt% sodium hydroxide aqueous solution into the separatory funnel, shake to make the polymerization inhibitor (hydroquinone) in styrene react chemically with sodium hydroxide to generate the sodium salt of hydroquinone, and separate liquid Then repeat washing 3 times until colorless; then wash with distilled water to pH=7, and use anhydrous sulfuric acid to remove water; collect fractions by vacuum distillation, and directly collect fractions by vacuum distillation of methyl methacrylate and acrylic acid.

[0030] At 40°C, ammonium persulfate was dissolved in deionized water, filtered and the filtrate was cooled with ice, and the filtrate was filtered out after crystallization, repeated filtration three times, and dried at room temperature before use.

Embodiment 3

[0031] Example 3: Preparation of P (St-MMA-AA) microspheres with a diameter of 253 nm

[0032] Install the electromagnetic stirrer, condenser tube and nitrogen tube into a 250mL three-necked flask, and then add 120mL deionized water after exhausting the air with nitrogen; dissolve 0.42g ammonium persulfate and 0.8g ammonium bicarbonate in deionized water; add 20mL deionized water. A mixture of styrene, methyl methacrylate, and acrylic monomers in a volume ratio of 90:5:5 was distilled under pressure. After passing nitrogen to remove oxygen, at a stirring speed of 400 rpm, the water bath was heated to 70 ° C, and the reaction was stable for 7 h under nitrogen atmosphere; after the polymerization was completed, the unpolymerized monomer was removed by volatilization under continuous stirring, and the agglomerated colloidal particles in the emulsion were removed by suction filtration. The spheres were centrifuged and washed three times to remove impurities, thereby obtaining P (S...

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Abstract

The invention belongs to the technical field of materials and particularly relates to a method for preparing gradient-controllable colloidal photonic crystal. An improved convection self-assembly method is adopted to prepare polymer colloidal photonic crystal with controllable layer number, and the colloidal photonic crystal with controllable longitudinal gradient is prepared by etching of isotropic oxygen plasmas. The whole process is simple and convenient to operate, low in consumption, clean and high in controllability, and the colloidal photonic crystal with controllable longitudinal gradient has excellent stability. Layer number of the colloidal photonic crystal is controlled by regulating concentration of microsphere dispersion solution and pulling speed, and three-dimensional colloidal photonic crystals with different dimensional gradient structures can be prepared by regulating etching power and etching time in the etching process of isotropic oxygen plasmas. The position of photonic forbidden bands can be adjusted through the gradient structure, so that the gradient-controllable colloidal photonic crystal can be used for fluorescene enhancement, sensing and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a colloidal photonic crystal with a controllable gradient. Background technique [0002] Photonic crystals can control the transmission of light in the same way that semiconductors control the movement of electrons. In view of the problems of high energy consumption and slow information transmission caused by the thermal effect of semiconductor integrated circuits, the idea of ​​using photons as information carriers has attracted extensive attention of researchers. It is the dream of scientists to design "integrated optical circuits" similar to integrated circuits and eventually develop into all-optical communication, photonic computers and other photonic industries. In the preparation of photonic crystal structures, the self-assembly of colloidal microspheres has the characteristics of simple method and low cost. In recent years, colloidal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/14C08F220/06C30B29/58
Inventor 张刚陈俊波黄贺
Owner JILIN UNIV
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