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A method for cryopreserving two-dimensional nano-powder dispersion

A two-dimensional nanotechnology, cryopreservation technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of complex operation, high cost, low production efficiency, etc., and achieve simple process, low cost and easy operation. Effect

Active Publication Date: 2015-11-25
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is expensive, high energy consumption, complex operation and low production efficiency
The Chinese patent application number CN201310131520.1 proposes a method for rapid preparation of graphene powder by freeze filtration. By freezing the graphene dispersion to form ice cubes, and then separating the flocculent powder after thawing, this method can to a certain extent However, this method still cannot completely and effectively change the problem of agglomeration of two-dimensional nanomaterials.

Method used

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  • A method for cryopreserving two-dimensional nano-powder dispersion
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  • A method for cryopreserving two-dimensional nano-powder dispersion

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Experimental program
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Effect test

Embodiment 1

[0030] Step 1: Add the prepared graphene powder at a ratio of 1 mg / ml to a mixed solution containing 30% by volume of ethanol and water, and sonicate for 3 hours.

[0031] Step 2: Centrifuge the graphene dispersion at a speed of 500 rpm for 45 minutes, and then transfer the supernatant.

[0032] Step 3: Slowly pour the supernatant into a liquid nitrogen container, and at the same time stir rapidly with a glass rod to freeze powder.

[0033] Step 4: Transfer the processed frozen powder into a plastic container, quickly place it in the freezer of an ordinary refrigerator, and store it at a temperature of about -18°C for 1 month.

[0034] Step 5: When in use, transfer the frozen powder to room temperature to thaw to form a graphene dispersion.

Embodiment 2

[0036] Step 1: Add 3 mg / ml hexagonal boron nitride powder to a mixed solution containing 40% volume ratio of isopropanol and water; use jet cavitation method to treat at 30 MPa for 3 hours.

[0037] Step 2: Centrifuge the boron nitride dispersion at a speed of 500 rpm for 45 minutes, and then transfer the supernatant.

[0038] Step 3: Slowly pour the supernatant into a liquid nitrogen container, and at the same time stir it with a glass rod to form a frozen powder.

[0039] Step 4: Transfer the processed frozen powder into a plastic container, quickly place it in the freezer of an ordinary refrigerator, and store it at a temperature of about -20°C.

[0040] Step 5: When in use, transfer the frozen powder to normal temperature to thaw to form a two-dimensional nano boron nitride dispersion.

Embodiment 3

[0042]Step 1: Add molybdenum disulfide powder at a ratio of 5 mg / ml to a mixed solution of acetone and water at a ratio of 50% by volume; treat for 3 hours at 20 MPa by a jet cavitation method.

[0043] Step 2: Centrifuge the molybdenum disulfide dispersion at a speed of 500 rpm for 45 minutes, and then transfer the supernatant to a plastic container.

[0044] Step 3: Slowly pour the supernatant into a liquid nitrogen container, and at the same time stir it with a glass rod to form a frozen powder.

[0045] Step 4: Transfer the processed frozen powder into a plastic container, quickly place it in the freezer of an ordinary refrigerator, and store it at a temperature of about -24°C.

[0046] Step 5: When in use, transfer the frozen powder to normal temperature to thaw to form a two-dimensional nanomolybdenum disulfide dispersion.

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Abstract

A cryopreservation method for a two-dimension nano-powder dispersion solution comprises the steps: step 1, adding two-dimension nano-material sheets into a mixed solution to prepare a dispersion solution with a predetermined concentration, and mixing for a period; step 2, performing centrifugation processing on the above dispersion solution, after the processing is finished, standing for a period, and then transferring the supernatant to a container; step 3, employing a low-temperature liquid gas to rapidly cool the two-dimension nano-powder to obtain a refrigerated powder; step 4, transferring the refrigerated powder of the dispersion solution into a low-temperature apparatus for storage, and controlling the storage temperature to be lower than the freezing point of the dispersion medium; and step 5, transferring the refrigerated powder out from the low-temperature apparatus, and unfreezing to form the two-dimension nano-powder dispersion solution again. The two-dimension nano-powder dispersion solution forms a solid for long-term storage by employing a low-temperature liquid gas for rapid refrigeration, so that the method helps to effectively avoid the easily-appeared agglomeration and re-stacking problems of the two-dimension nano-powder dispersion solution in a liquid medium, and is beneficial for device manufacturing, standardization and micromation of nano-materials.

Description

Technical field: [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for cryopreserving a two-dimensional nanometer powder dispersion. Background technique [0002] Two-dimensional nanomaterials refer to materials in which only one dimension is at the nanometer level. Due to their unique structures and properties, more and more attention has been paid to them. Two-dimensional nanomaterials can be used alone as functional materials. For example, the excellent conductivity of graphene can be expected to be used as a new generation of electronic components or transistors. At the same time, two-dimensional nanomaterials can also be combined with other materials to form unique properties. , such as graphene as a carrier combined with noble metal catalysts to form more excellent composite catalytic materials, etc. [0003] Two-dimensional nanomaterials mainly include graphene, molybdenum disulfide, boron nitride, tungs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/46C09C3/04C09C3/08C09C1/00C01B31/04C01G39/06C01B21/064B82Y30/00B82Y40/00C01B32/194
Inventor 沈志刚刘磊张晓静麻树林
Owner BEIHANG UNIV
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