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A kind of colloidal crystal preparation method based on lb membrane method

A technology of colloidal crystal and LB film, which is applied in the field of colloidal crystal preparation based on LB film method, can solve the problems of uncontrollable process, difficulty of colloidal crystal, poor repeatability, etc., and achieve repeatable and high-quality results

Active Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large number of influencing parameters, it is extremely difficult to obtain high-perfect colloidal crystals by spin coating
Self-assembly at the gas-liquid interface is an effective method to prepare large-scale monolayer colloidal crystals, but the process is uncontrollable and reproducible when transferring the 2D crystal array on the interface to a solid substrate using manual methods

Method used

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  • A kind of colloidal crystal preparation method based on lb membrane method
  • A kind of colloidal crystal preparation method based on lb membrane method
  • A kind of colloidal crystal preparation method based on lb membrane method

Examples

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preparation example Construction

[0035] see figure 1 , a colloidal crystal preparation method based on the LB film method according to the embodiment of the present invention is a method for preparing colloidal crystals by the LB film method, comprising the following steps:

[0036] Step 1, preparing a dispersion of colloidal particles, mixing water and an organic solvent that aids dispersion in a volume ratio of 1:N, and ultrasonicating for 30 minutes;

[0037] Step 2, slowly dispersing the colloidal particles on the liquid surface of the LB tank 3 through the guide sheet inserted into the water obliquely; wherein, the liquid 4 placed in the LB tank 3 can be water;

[0038] Step 3, use the sliding stick 1 to compress the single-layer film on the liquid surface, and after reaching the preset surface film pressure, the sliding stick reciprocates to adjust the arrangement of the colloidal particles; the surface pressure sensor 2 is used to measure the surface film pressure;

[0039] Step 4, set the appropriate...

Embodiment 1

[0050] A method for preparing colloidal crystals by an LB film method in an embodiment of the present invention comprises the following steps:

[0051] Step 1, prepare an aqueous dispersion of polystyrene colloidal particles, mix it with ethanol at a volume ratio of 1:1, and sonicate for 30 minutes.

[0052] Step 2: Slowly disperse the polystyrene microspheres on the liquid surface of the LB tank through the hydrophilic silicon chip inserted into the water obliquely, wherein the angle between the silicon chip and the water surface is 30°.

[0053] In step 3, the single-layer film on the liquid surface is compressed using a sliding stick, and the moving speed of the sliding stick is 0.2 mm / s. After reaching the set surface membrane pressure of 20mN / m, the slide rod reciprocates 3 times to adjust the arrangement of colloidal particles. This process is also known as film formation.

[0054] Step 4, set the surface membrane pressure to 40mN / m, use a sliding stick to control the ...

Embodiment 2

[0059] A method for preparing colloidal crystals based on the LB film method in the embodiment of the present invention comprises the following steps:

[0060] Step 1, the pre-prepared colloidal particle dispersion is dispersed on the liquid surface of the LB tank through the guide sheet;

[0061] Step 2, use the slide stick to compress the single-layer film on the liquid surface; after reaching the preset surface film pressure, the slide stick reciprocates to adjust the arrangement of the colloidal particles; where the preset surface film pressure is 5mN / m;

[0062] Step 3, preset the surface film pressure, sliding rod speed and film pulling speed to improve the coating method of the substrate and transfer the colloidal particles to the substrate;

[0063] In step 4, the surface of the substrate is completely covered by colloidal particles; drying to complete the preparation of colloidal crystals.

[0064] Step 5, changing the coating method, and repeating steps 2 to 4 in a ...

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Abstract

The invention discloses a method for preparing colloidal crystals based on an LB film method, comprising: dispersing colloidal particles in a mixing system of water and an organic solvent; dispersing the colloidal particles on the liquid surface of LB equipment by means of a slope-type guide piece; The density and self-assembly of colloidal particles on the water surface are controlled by the compression of the sliding rod and the setting of the surface film pressure; finally, the transfer of the colloidal particle array to the substrate is realized by selecting the appropriate film pulling speed, sliding rod speed and surface film pressure. The method of the present invention realizes the controllability, repeatability and high quality of preparing colloidal crystals by controlling relevant preparation parameters, and can make the colloidal crystals transferred to the substrate arranged uniformly and densely in a wide range.

Description

technical field [0001] The invention belongs to the technical field of colloidal crystal preparation, in particular to a colloidal crystal preparation method based on an LB membrane method (Langmuir-Blodgett membrane method, Langmuir-Blodgett membrane method). Background technique [0002] Colloidal crystals are a class of substances with ordered structures formed by dispersed micron-scale or sub-micron-scale inorganic or organic particles (also called colloidal particles). The structure of colloidal crystals is very similar to that of crystals composed of molecules or atoms, except that each lattice point in colloidal crystals is a colloidal particle with a larger size. Due to the periodic micro-nano structure, colloidal crystals have special properties and uses, and also show great application potential. In the field of micro-nano manufacturing, nanoparticle arrays formed by colloidal self-assembly processes using nanoparticles as raw materials can be used as masks for et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/64C30B5/00
CPCC30B5/00C30B29/64
Inventor 牛刚武和平任巍姜陆月
Owner XI AN JIAOTONG UNIV