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Temperature gradient-based method for preparing three-dimensional colloidal crystal

A temperature gradient, three-dimensional colloid technology, used in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems of slow temperature stable response, limited control accuracy, etc., and achieve the effect of stable and rapid control

Active Publication Date: 2015-07-08
东莞市三航军民融合创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies are all based on a single control of the temperature field, but the steady response of the temperature is relatively slow, and the control accuracy is limited

Method used

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  • Temperature gradient-based method for preparing three-dimensional colloidal crystal
  • Temperature gradient-based method for preparing three-dimensional colloidal crystal
  • Temperature gradient-based method for preparing three-dimensional colloidal crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment is a method for preparing a colloidal single crystal based on directional solidification, and the specific process is:

[0023] Step 1, prepare PNIPAM colloidal suspension. PNIPAM colloidal particles are used, and the monodispersity of the colloidal particles is less than 5%. The colloidal particles are dissolved with deionized water as a solvent; when the temperature of the deionized water is 25° C., the hydrodynamic diameter of the colloidal particles is 750 nm. Obtain PNIPAM colloidal suspension.

[0024] Step 2, control the volume fraction of PNIPAM colloidal suspension

[0025] The volume fraction of the PNIPAM colloidal suspension was controlled by a centrifuge. Set the temperature of the centrifuge to 32° C., the rotational speed of the centrifuge to 5000 r / min, and the centrifugation time to 50 min. The obtained PNIPAM colloidal suspension is placed in the centrifuge for centrifugation. After the centrifugation ends, the supernatant in the c...

Embodiment 2

[0028] This embodiment is a method for preparing a colloidal single crystal based on directional solidification, and the specific process is:

[0029] Step 1, prepare PNIPAM colloidal suspension. Using PNIPAM colloidal particles, the monodispersity of the colloidal particles is less than 5%. The colloidal particles are dissolved with deionized water as a solvent; when the temperature of the deionized water is 25° C., the hydrodynamic diameter of the colloidal particles is 750 nm. Obtain PNIPAM colloidal suspension.

[0030] Step 2, controlling the volume fraction of the PNIPAM colloidal suspension.

[0031]The volume fraction of the PNIPAM colloidal suspension was controlled by a centrifuge. Set the temperature of the centrifuge to 32° C., the rotational speed of the centrifuge to 5000 r / min, and the centrifugation time to 100 min. The obtained PNIPAM colloidal suspension is placed in the centrifuge for centrifugation. After the centrifugation ends, the supernatant in the...

Embodiment 3

[0034] This embodiment is a method for preparing a colloidal single crystal based on directional solidification, and the specific process is:

[0035] Step 1, prepare PNIPAM colloidal suspension. PNIPAM colloidal particles are used, and the monodispersity of the colloidal particles is less than 5%. The colloidal particles are dissolved with deionized water as a solvent; when the temperature of the deionized water is 25° C., the hydrodynamic diameter of the colloidal particles is 750 nm. Obtain PNIPAM colloidal suspension.

[0036] Step 2, controlling the volume fraction of the PNIPAM colloidal suspension.

[0037] The volume fraction of the PNIPAM colloidal suspension was controlled by a centrifuge. Set the temperature of the centrifuge to 32° C., the rotational speed of the centrifuge to 5000 r / min, and the centrifugation time to 40 minutes. The obtained PNIPAM colloidal suspension is placed in the centrifuge for centrifugation. After the centrifugation ends, the superna...

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Abstract

The invention discloses a temperature gradient-based method for preparing a three-dimensional colloidal crystal. By utilizing the characteristic that the effective diameters of temperature-sensitive PNIPAM colloidal particles change along with the change of temperature, the PNIPAM-based colloidal crystal growth behavior can be realized by adopting a controlled temperature field. The colloidal crystal growth process can be stably and rapidly controlled by virtue of a precise orientation displacement platform under the condition that a constant temperature field is controlled, so that a single crystal of the colloidal crystal is prepared. According to the method disclosed by the invention, the three-dimensional colloidal crystal can be rapidly obtained, and the possibility is provided for large-scale application of the colloidal crystal. Meanwhile, the single crystal of the prepared colloidal crystal serves as a template, the other types of photonic crystals can be further obtained, the problem that the three-dimensional colloidal crystal cannot be rapidly prepared is solved, and the method has the extremely high application value in the fields of light control and optical integration.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-periodic materials, and relates to a rapid preparation method of colloidal crystals crystallized based on temperature changes, in particular to a method for rapidly preparing three-dimensional colloidal crystal single crystals through directional solidification with a temperature platform of a pulling mechanism. Background technique [0002] Colloidal crystals are a class of substances with a three-dimensional ordered structure formed by monodisperse micron or submicron inorganic or organic particles (also called colloidal particles). Colloidal crystals have special optical properties and can be used to prepare optical devices such as photonic crystals, optical switches, and ion probes, and have important applications in microwave communications, filtering technology, and stealth technology. At present, there are many materials and methods for preparing colloidal crystals, which are ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/58C30B21/02
Inventor 王理林王志军李俊杰王锦程
Owner 东莞市三航军民融合创新研究院
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