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Magnetic field induced patterned assembly and erasable magnetically controlled phase-change material and preparation method thereof

A phase-change material and pattern-induced technology, which is applied in the direction of diamagnetic/paramagnetic materials, magnetic materials, magnetic objects, etc., can solve the problems of stable pattern shape, pattern can not be erased, etc., to achieve simple method and low material cost Effect

Active Publication Date: 2019-10-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In view of the problems that the existing magnetic field-induced patterned assembly cannot keep the pattern shape stable and cannot be erased after the pattern is formed, this application provides a magnetic field-induced patterned assembly and erasable magnetic control phase change material, and at the same time , the present invention also provides a preparation method of the magnetron phase change material

Method used

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  • Magnetic field induced patterned assembly and erasable magnetically controlled phase-change material and preparation method thereof
  • Magnetic field induced patterned assembly and erasable magnetically controlled phase-change material and preparation method thereof
  • Magnetic field induced patterned assembly and erasable magnetically controlled phase-change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of Surface Nonpolar Modified Superparamagnetic Nanomaterials / Low Temperature Phase Change Nonpolar Polymer Composite

[0042] (1) Weigh 0.5g nanometer Fe 3 o 4 Add to 80mL of anhydrous N,N-dimethylformamide (DMF), ultrasonic for half an hour to ensure stable dispersion, dropwise add 1mL of ethanol containing 20% ​​γ-glycidyl etheroxypropyltrimethoxysilane surfactant solution, the solution was added into a three-necked flask, mechanically stirred and reacted at 70°C for 2 hours, washed with ethanol and dried after the reaction;

[0043] (2) Add the dried product to 100mL DMF, add 0.8g octadecylamine, react at 80°C for 5 hours, magnetically separate after the end, wash with DMF hot solution, remove residual octadecylamine, and use tetrachloride Dissolve superparamagnetic nanomaterials with carbonized carbon, remove insoluble matter by suction filtration, and evaporate the solution to obtain modified superparamagnetic nanomaterials. Its TEM and infrared spect...

Embodiment 2

[0053] Preparation of Surface Polarity Modified Superparamagnetic Nanomaterials / Low Temperature Phase Change Polar Polymer Composite

[0054] (1) Weigh 0.5g nanometer Fe 3 o 4 Add to 10mL water, add 3mL dimethyloctadecyl[3-trimethoxysilylpropyl]ammonium chloride methanol solution (mass fraction is 40%), add dropwise ammonia solution with pH=12, adjust pH to 10 , stirred and aged at room temperature for 24 hours, washed with water and methanol for several times, magnetically separated, dissolved in tetrahydrofuran, removed by suction filtration, and evaporated to dry the solution to obtain a superparamagnetic nanomaterial with a quaternary ammonium salt function on the surface;

[0055] (2) Take 10 g of polyethylene glycol monomethyl ether with a molecular weight of 2000, add 0.5 g of sulfamic acid and 0.08 g of urea, heat to 120 ° C for 5 hours, dissolve with 100 mL of ethanol after the reaction is completed, filter, evaporate to dryness, A polymer salt having a sulfonate en...

Embodiment 3

[0060] With reference to Example 1, the superparamagnetic nanomaterial / low temperature phase change nonpolar polymer composite material of surface nonpolar modification is prepared, the difference is that in step (2), the nanomagnetic material with epoxy group and alkane The reaction temperature of the amine was 65° C., and the reaction time was 4 hours.

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Abstract

The invention discloses a magnetic field induced patterned assembly and erasable magnetically controlled phase-change material and a preparation method thereof. As for the magnetically controlled phase-change material, a polar or non-polar low-temperature phase-change high polymer material is taken as a matrix material, a surface polarity or non-polarity modified superparamagnetic nano-material istaken as a magnetic field response unit, and the mass ratio of the magnetic field response unit to the matrix material is (0.2 to 0.5):1, wherein the molecular polarity of the matrix material is thesame as that of the magnetic field response unit. By modifying the surfaces of superparamagnetic particles, the superparamagnetic particles have the surface property of being dissolved into the corresponding phase-change material and then are effectively and stably composited with a phase-change substrate, and the magnetically controlled phase-change material capable of rapidly responding to a magnetic field can be obtained through uniform dispersion; and the material is subjected to patterned assembly through a magnetic field array at the high temperature, when the temperature is decreased below a melting point, the pattern has shape stability when no magnetic field exists, and when the temperature is increased above the melting point, the material can realize pattern erasing through self-leveling under the non-magnetic-field effect.

Description

technical field [0001] The invention relates to a magnetically controlled phase change material, in particular to a magnetically controlled phase change material induced by a magnetic field to pattern assembly and erasable and a preparation method thereof, which belongs to the application field of surface pattern construction and surface functionalization. Background technique [0002] Material surface functionalization and patterning technology has been paid close attention to by people. Traditional surface preparation techniques mainly include printing, spraying, engraving and compression molding. These technologies are widely used in the fields of large-area surface treatment and templated surface processing. Modern surface preparation techniques include chemical etching, self-assembly and photolithography. These technologies can well make up for the defects contained in traditional technologies, and play a very important role in the surface modification of modern infor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L91/06C08L71/02C08K9/06C08K9/04C08K3/22H01F1/00
CPCC08K9/06C08K9/04C08K9/08C08K3/22H01F1/0018C08K2201/011C08K2003/2275C08L91/06C08L71/02
Inventor 方亮陈顺平王帅陆春华许仲梓
Owner NANJING UNIV OF TECH
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