Method for preparing photonic crystal material through ordered self-assembly of emulsion

A photonic crystal and self-assembly technology, applied in the direction of organic dyes, etc., can solve the problems of cumbersome process, complicated operation, long time consumption, etc., to avoid danger, simplify the preparation process, and reduce the cost.

Active Publication Date: 2020-07-03
TIANJIN UNIV
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Problems solved by technology

[0007] Aiming at the defects or improvement needs of the existing photonic crystal material preparation technology, the object of the present invention is an efficient preparation of an ordered porous photonic crystal material, wherein the molecular structure control and preparation conditions (such as mass concentration) of key raw materials in the method are , ratio and environmental factors) etc., can be easily and efficiently prepared the above photonic crystal materials, avoiding the cumbersome process, time-consuming, complicated operation and harsh preparation conditions of traditional preparation methods.

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  • Method for preparing photonic crystal material through ordered self-assembly of emulsion
  • Method for preparing photonic crystal material through ordered self-assembly of emulsion
  • Method for preparing photonic crystal material through ordered self-assembly of emulsion

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preparation example Construction

[0043] The preparation method of the photonic crystal comprises the following contents and steps:

[0044] (1) dissolving the amphiphilic branched block polymer in a water-immiscible organic solvent to form a polymer solution with a mass concentration of 0.1wt% to 10wt%; adding the polymer solution to deionized water or In the aqueous solution containing surfactants, the types of surfactants include CTAB (cetyltrimethylammonium bromide), SDS (sodium dodecyl sulfate), PVA (polyvinyl alcohol), etc., and the molecular weight of PVA is 1 ×10 4 ~5×10 5 g / mol, the molecular weight distribution (PDI) is 1-10, the mass concentration of the surfactant is 0.1wt%-10wt%, and a layered oil-water two-phase solution is formed due to phase separation, and the polymer solution accounts for the volume percentage of the water phase 1% to 35%;

[0045] Alternatively, the polymer solution is emulsified by SPG (Shirasu Porous Glass) membrane emulsification technology, microfluidic technology or ...

Embodiment 1

[0050] The preparation method of the ordered porous amphiphilic branched block polymer photonic crystal material in this embodiment comprises the following steps:

[0051] (1) Dissolving the amphiphilic branched block polymer PS-b-PEO in toluene to obtain a solution with a mass concentration of 2 wt%. Next, the toluene solution was made into micron-sized droplets with uniform size by using microfluidic technology, and the obtained droplets were dispersed into an aqueous PVA solution, wherein the mass concentration of PVA in water was 2 wt%. The setting parameters of the microfluidic equipment include: the inner diameter of the chip channel used is 150 μm, the flow rate of the dispersed phase is 240 μL / h, the flow rate of the continuous phase is 1920 μL / h, and the obtained droplet diameter is 120 μm. The molecular weight of PS-b-PEO used is 24×10 4 g / mol, the degree of polymerization of the lipophilic block PS in the main chain is 30 repeat units, the polymerization degree of ...

Embodiment 2

[0054] The preparation method of the ordered porous amphiphilic branched block polymer photonic crystal material in this embodiment comprises the following steps:

[0055] (1) The amphiphilic branched block polymer PtBA-b-PEO was dissolved in chloroform to obtain a solution with a mass concentration of 2 wt%. Next, the chloroform solution was made into micron-sized droplets with uniform size by using microfluidic technology, and the obtained droplets were dispersed into an aqueous PVA solution, wherein the mass concentration of PVA in water was 2 wt%. The setting parameters of the microfluidic equipment include: the inner diameter of the chip channel used is 150 μm, the flow rate of the dispersed phase is 240 μL / h, the flow rate of the continuous phase is 3600 μL / h, and the obtained droplet diameter is 30 μm. The molecular weight of the PtBA-b-PEO is 33×10 4g / mol, the degree of polymerization of the lipophilic block PtBA in the main chain is 30 repeat units, the degree of pol...

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Abstract

The invention relates to a method for preparing a photonic crystal material through ordered self-assembly of an emulsion. The method comprises the following steps: dissolving an amphiphilic branched block polymer in a water-insoluble organic solvent to form a polymer solution, and dispersing the polymer solution in an aqueous solution containing a surfactant to form micron-sized liquid drops; under the conditions that the temperature is 0-60 DEG C and the relative humidity is 5-80%, completely volatilizing the organic solvent in the amphiphilic branched block polymer solution, carrying out reversed-phase emulsification in the volatilization process to form a water-in-oil-in-water double emulsion, and self-assembling nano-water drops in an oil phase to form an ordered arrangement structurein order to obtain the solid photonic crystal material with the ordered porous structure. The photonic crystal material comprises the ordered porous structure, and the color of reflected light coversthe whole visible light range. The preparation method provided by the invention is simple to operate and high in repeatability, and the problems of tedious process, long consumed time, complex operation, harsh preparation conditions and the like of a traditional preparation method are avoided.

Description

technical field [0001] The invention belongs to the field of preparation methods of photonic crystal materials, and in more detail, relates to a new method for preparing photonic crystal materials with porous structures by orderly self-assembly of water-in-oil-in-water (w / o / w) double emulsions. The branched block copolymer self-assembles to form an ordered porous structure, including the preparation method of the emulsion and the photonic crystal material of the porous structure. Background technique [0002] In 1987, S.John and E.Yablonovitch independently proposed the concept of photonic crystals (Photonic Crystal), that is, photonic crystals are materials with different refractive indices assembled into submicron highly ordered periodic structures. In conducting crystals, electrons travel as waves, and waves that meet certain criteria can pass through a periodic potential without scattering. However, because there are gaps in the crystal's band structure, electrons are p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/12C08J3/03C09B69/10C08L53/00C08L87/00C08L83/12
CPCC08J9/28C08J3/12C08J3/03C09B69/109C08J2353/00C08J2387/00C08J2383/12
Inventor 宋东坡陈曦李悦生
Owner TIANJIN UNIV
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