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Method for preparing two-dimensional or three dimensional colloid crystal

A technology of three-dimensional colloids and colloidal crystals, applied in colloid chemistry, colloid chemistry, chemical instruments and methods, etc., can solve problems such as self-organization, and achieve the effects of short preparation cycle, high efficiency, and simple technical process

Inactive Publication Date: 2005-04-13
NANJING UNIV
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Problems solved by technology

The reason is: for heavier microspheres, although the capillary attraction can continuously drive the solvent into the microchannel, the liquid flow formed in the microchannel cannot bring these heavier microspheres to the port of the channel and self-organize.

Method used

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  • Method for preparing two-dimensional or three dimensional colloid crystal
  • Method for preparing two-dimensional or three dimensional colloid crystal
  • Method for preparing two-dimensional or three dimensional colloid crystal

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Embodiment Construction

[0028] The invention prepares high-quality two-dimensional and three-dimensional colloidal crystals through the self-assembly process of colloidal microspheres in microcavities under the joint action of gravity and surface tension. See the implementation method figure 2 .

[0029] The present invention first selects a quartz plate as a substrate and lays it flat. Then place a U-row divider with a certain thickness on the quartz plate. Then cover it with a quartz plate of the same size. Finally, while maintaining the relative position of the two quartz plates, fix them.

[0030] The separator in the present invention can be a cylindrical or rectangular dielectric rod in cross section, such as figure 2 shown. The material of the spacer is selected from a dielectric material that can withstand a certain amount of extrusion without deformation.

[0031] The colloidal microsphere suspension of the present invention is dropped into the prepared microcavity, and after standin...

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Abstract

The present invention is the preparation process of 2D and 3D colloidal crystal. Inside the space between two parallel plates, one micro cavity system with three closed sides and one opened end is set and colloid suspension is injected into the micro cavity. Then, the opening of the micro cavity is inclined downward, so that the microballoons under gravitational force greater than buoyancy will first form one random dense arrangement on one substrate of the micro cavity. After that, in the process of drying the colloid suspension from the opening to the inside of the micro cavity or moving the liquid surface from the opening to the inside of the micro cavity, the microballoons under surface tension will be self organized to form ordered structure. The present invention has simple technological process, short preparation period and high efficiency, and can prepare great area and high quality 2D and 3D colloidal crystal in ordered structure.

Description

1. Technical field [0001] The present invention relates to the preparation of a kind of colloidal crystal material, especially through the double effect of self-assembly under gravity and the surface tension of liquid, the colloidal microsphere of large mass (especially for the silicon dioxide microsphere with diameter greater than 1 micron) ) are arranged into hexagonal close-packed monolayer (two-dimensional) and face-centered cubic multilayer (three-dimensional) structured colloidal crystals. 2. Background technology [0002] The study of two-dimensional and three-dimensional colloidal crystals composed of monodisperse, micron or submicron colloidal microspheres not only has important scientific research value, but also has important practical value. For example, it can be used as a template to prepare highly ordered porous materials and as a precursor to prepare high-strength ceramics. In addition, because colloidal crystals have special optical diffraction characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
Inventor 王振林董晗陈卓詹鹏董雯刘俊兵闵乃本
Owner NANJING UNIV
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