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Phase-change microsphere as well as preparation method and application thereof

A technology of phase-change microspheres and microspheres, which is applied in the field of nanoporous materials and phase-change energy storage, can solve the problems of high specific surface area, inapplicability, high porosity, etc., and achieve simple preparation process, large enthalpy value, excellent The effect of conductivity

Active Publication Date: 2018-01-23
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this large size in traditional applications cannot be applied to current micro devices and increasingly miniaturized electronic circuits, so there are airgel microspheres of different sizes. For example, in Chinese patent 201610355135, inkjet printing-liquid The graphene airgel microspheres obtained by the marble-supercritical fluid technology have good monodispersity, good electrical conductivity, hydrophobicity, high porosity and high specific surface area, and the size is between 500nm and 5mm. It will become the best support material choice for phase change materials in the application of micro devices and micro electronic circuits

Method used

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  • Phase-change microsphere as well as preparation method and application thereof
  • Phase-change microsphere as well as preparation method and application thereof
  • Phase-change microsphere as well as preparation method and application thereof

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preparation example Construction

[0046] Another aspect of the embodiments of the present invention provides a method for preparing the aforementioned phase-change microspheres. In a typical embodiment, the preparation method includes: using airgel microspheres as templates, filling them by melt impregnation, and filling the airgel microspheres The phase change material is introduced into the three-dimensional network of the spheres, and the external residual phase change material is removed, followed by cooling to obtain functional phase change microspheres.

[0047] As one of the preferred solutions, the preparation method includes: providing airgel microspheres as a template, and impregnating the airgel microspheres in a molten phase change material at 30-150°C under vacuum or normal pressure environment , standing for 0.5 to 12 hours, melt-filled, cooled and solidified to obtain phase-change microspheres.

[0048] Further, the preparation method further includes: placing the phase-change microspheres on fi...

Embodiment 1

[0070] (1) Selecting graphene airgel microspheres with a diameter of 300 μm as a template for preparing phase change microspheres;

[0071] (2) Put the graphene airgel microspheres and solid paraffin together in a vacuum at 80° C. for 3 hours.

[0072] (3) The microspheres impregnated with the phase change material were taken out, placed on filter paper, and left to stand at 80° C. for 1 hour to remove excess phase change material on the outer surface of the microspheres.

[0073] (4) cooling the above microspheres at room temperature to obtain the phase change microspheres. figure 1 The SEM photo of the phase change microspheres obtained by the present embodiment is shown, figure 2 The TG curve of the phase change microspheres obtained by the present embodiment is shown, image 3 The DSC curve of the phase change microspheres obtained in this example is shown.

[0074] (5) Heat flow stabilizer: apply a voltage across the phase change microspheres, Figure 4 A schematic d...

Embodiment 2

[0076] (1) Select PI-based carbon airgel microspheres with a diameter of 400 μm as templates for preparing phase-change microspheres;

[0077] (2) Put the PI-based carbon airgel microspheres and solid paraffin together in a vacuum at 70° C. for 5 hours.

[0078] (3) The microspheres impregnated with the phase change material were taken out, placed on filter paper, and allowed to stand at 70° C. for 1 hour to remove excess phase change material on the outer surface of the microspheres.

[0079] (4) cooling the above microspheres at room temperature to obtain the phase change microspheres.

[0080] (5) Heat flow stabilizer: apply an alternating current with a pulse width of 1 ms at both ends of the phase change microsphere, Figure 6 The current signal of the phase-change microspheres in the present embodiment is shown, Figure 7 The voltage change of the phase change microspheres in this embodiment is shown, and please refer to Table 1 for other parameters.

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Abstract

The invention discloses a phase-change microsphere as well as a preparation method and application thereof. The phase-change microsphere is mainly composed of an aerogel microsphere and a phase-changematerial, wherein the aerogel microsphere has a three-dimensional porous network structure; the phase-change material is uniformly distributed in the three-dimensional porous network structure. The preparation method comprises the following steps: taking the aerogel microsphere as a template; immersing the aerogel microsphere into the molten-state phase-change material; melting and filling, and cooling and curing to obtain the phase-change microsphere. The phase-change microsphere disclosed by the invention has unique electric properties, resistance sudden changes, adjustable resistance, highheat enthalpy and good circulating stability; the phase-change microsphere has high sensitivity on heat when being applied to a hot flow stabilizer; the phase-change microsphere can have the resistance sudden changes by utilizing extremely low heat, so that a circuit is protected; the phase-change microsphere can have excellent heat sensitivity and resistance sudden change performance in high-frequency current, low-frequency current, constant current and alternating current / constant current cross-varying circuits and has a great application prospect.

Description

technical field [0001] The invention relates to a novel functional microsphere, in particular to a functional phase change microsphere and its preparation method and application, belonging to the technical field of nanoporous materials and phase change energy storage. Background technique [0002] The generation of airgel originated in the 1930s, a substance accidentally invented by chemist Sterven.S.Kistler of California Pacific University, commonly known as "frozen smoke", which extracts the water in silica gel, and then uses such as Made by displacing water with a gas such as carbon dioxide. After more than 80 years of development, airgel materials have been gradually commercialized and have important applications in many fields. [0003] The latent heat storage of phase change energy storage materials is the most feasible method for the utilization of waste heat generated by the surrounding environment, solar energy and locomotives or electronic devices. Organic solid-...

Claims

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Application Information

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IPC IPC(8): B01J13/06C09K5/06
CPCY02P20/54
Inventor 张学同李广勇
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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