Freezing method of material with microcosmic lamellar structure

A freezing method and a layered structure technology are applied in the field of freezing for preparing materials with a microscopic layered structure, and can solve problems such as single microstructure

Inactive Publication Date: 2015-04-22
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microstructure of the materials prepared by the existing freezing methods is still relatively simple. In order to meet the application requirements in a wider range of fields, the freezing methods used in the control of the material microstructure still need further research and development.

Method used

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  • Freezing method of material with microcosmic lamellar structure
  • Freezing method of material with microcosmic lamellar structure
  • Freezing method of material with microcosmic lamellar structure

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Prepare 100mL of chitosan solution of 20mg / mL; 3 ) installed on the freezing surface of the stainless steel freezing device; pour 4mL of prepared chitosan solution into the mold, and then cool down with liquid nitrogen from one end of the freezing surface to -100°C, so that the freezing point from one end of the freezing surface Move to the other end, so that the ice in the mold grows along one end of the freezing surface to the other end until the solution in the entire mold is completely frozen; put the frozen ice cubes in a vacuum freeze dryer for deicing and drying After 48 hours, the layered chitosan scaffold material can be obtained, and the microstructure of the product is characterized by a scanning electron microscope. The results are as follows: figure 1 It can be seen from the figure that the product has an obvious layered structure.

Embodiment 2

[0027] Prepare 100 mL of 20 mg / mL chitosan solution, then weigh 1 g of LDH micro-tablets (synthesized according to the literature: Colloids and Surfaces A: Physicochem. Eng. Aspects 408 (2012) 71-78) and add to the above solution, ultrasonic treatment until uniform dispersion , to obtain a mixed solution; the silicone mold (mould capacity 2 × 2 × 2cm 3 ) on the freezing surface of the stainless steel freezing device; pour 4mL of the prepared mixed solution into the mold, and then use liquid nitrogen to cool down from one end of the freezing surface to -100°C, so that the freezing point moves from one end of the freezing surface to the other. One end moves, so that the ice in the mold grows along one end of the freezing surface to the other until the solution in the entire mold is completely frozen; the ice cubes that have been frozen are placed in a vacuum freeze dryer for deicing and drying for 48 hours, The layered chitosan hydroxyapatite composite material can be obtained, ...

Embodiment 3

[0029] Take 6 mg / mL graphene oxide nanosheet aqueous solution (synthesized by Hummers method, Hummers, W., Jr.; Offeman, R.J.Am.Chem.Soc.1958, 80, 1339.); Silicone mold (mould capacity 2 × 2 ×2cm 3 ) is installed on the freezing surface of a stainless steel freezing device; pour 4 mL of the prepared above-mentioned graphene oxide nanosheet aqueous solution into the mold, and then use liquid nitrogen to cool down from one end of the freezing surface to -100 ° C, so that the freezing point changes from freezing to One end of the surface moves to the other end, so that the ice in the mold grows along one end of the freezing surface to the other end until the solution in the entire mold is completely frozen; the ice cubes that have been frozen are placed in a vacuum freeze dryer for detachment After ice-drying for 48 hours, the layered graphene oxide material can be obtained, and the microstructure of the product is characterized by a scanning electron microscope. The results are ...

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Abstract

The invention discloses a freezing method of a material with a microcosmic lamellar structure. The freezing method is characterized by comprising the steps of firstly dispersing precursor components of a to-be-prepared lamellar material into a water solution to prepare a precursor solution, adding the precursor solution into a freezing mold, regulating and controlling the temperature gradient of a freezing surface to prompt ice crystals to perform parallel lamellar oriented growth in a freezing process of the solution to extrude the precursor components in the solution to be between the adjacent ice crystals so as to assemble the precursor components into corresponding parallel lamellar structures, and then carrying out freeze drying so as to obtain the material with the microcosmic lamellar structure. The freezing method is suitable for preparing an organic polymer bracket material with the microcosmic lamellar structure or a composite material of the organic polymer bracket material, is especially suitable for preparing a nanometer-material macro-function assembly with the microcosmic lamellar structure and therefore has an important application value in the field of novel materials.

Description

technical field [0001] The invention relates to a novel freezing method, which can be used to prepare polymer scaffold materials with microscopic layered structure, and is especially suitable for assembling nanometer elements into macroscopic functional assembly materials with microscopic layered structure. Background technique [0002] At present, freeze-drying technology is mainly used in the drying treatment of medicine and food industry. In the field of material research, this technology is used to prepare three-dimensional porous scaffold materials with a certain microstructure. The methods that have been developed so far mainly include: the disordered freezing method used to prepare random three-dimensional porous scaffold materials, and the oriented frozen method used to prepare scaffold materials with ordered microporous structures. These two freezing methods are mainly used to prepare tissue engineering scaffold materials and some porous ceramic materials. In addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L5/08C08L5/04C08L29/04C08K3/32C08K3/04C01B31/04
Inventor 俞书宏高怀岭茅瓅波
Owner UNIV OF SCI & TECH OF CHINA
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