Preparation of multi-cavity carbon spheres by a self-assembly method driven by surface energy and its application

A self-assembly and cavity technology, applied in the preparation/purification of carbon, nano-carbon, nanotechnology, etc., can solve the problem that microfluidic technology is difficult to produce large quantities of products

Active Publication Date: 2019-07-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, only a few literatures have reported the method of preparing multi-cavity spheres through specially designed microfluidic devices, but the size distribution of the products is mostly hundreds of nanometers to several microns, and it is difficult to achieve mass production of products by microfluidic technology[ J.Am.Chem.Soc.2008,130,7800]

Method used

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  • Preparation of multi-cavity carbon spheres by a self-assembly method driven by surface energy and its application
  • Preparation of multi-cavity carbon spheres by a self-assembly method driven by surface energy and its application
  • Preparation of multi-cavity carbon spheres by a self-assembly method driven by surface energy and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 100mg of surfactant F127, add it into 10ml of deionized water, stir and dissolve at 40°C for 2h. Dissolve 50 mg of stearic acid in 0.5 mL of n-hexane, pour it into an aqueous solution of surfactant, and sonicate for 30 min to obtain a translucent white emulsion. Distill under reduced pressure at 50°C for 0.5h to remove n-hexane in the emulsion to obtain solution A. Weigh 275mg resorcinol, 210mg hexamethylenetetramine, 90ml deionized water, stir well at 40°C, add solution A, stir slowly and mix well to obtain solution B. The reaction solution B was transferred to a hydrothermal kettle, and hydrothermally reacted at 110°C for 4 hours to obtain a monodisperse multi-cavity polymer colloid solution C, which was centrifuged, washed with water and ethanol, and dried to obtain a dry multi-cavity polymer.

Embodiment 2

[0033] The multi-cavity polymer prepared in Example 1 was placed in a carbonization furnace for carbonization, protected by argon at 3°C / min to 150°C, kept at a constant temperature for 120min, and then raised to a carbonization temperature of 600°C at a heating rate of 5°C / min. Constant temperature for 120min, carbonization to obtain multi-cavity carbon spheres with shape retention.

[0034] The cavity size of multi-cavity carbon spheres obtained in this embodiment is 12 ± 2nm, the number of cavities is 40 ± 5, and the diameter of carbon spheres is 105 ± 10nm. The transmission electron microscope shows figure 1 shown.

Embodiment 3

[0036]Take 50ml of solution B in Example 1, add 50ml of deionized water, mix and stir evenly, transfer the obtained solution into a hydrothermal kettle, and perform a hydrothermal reaction at 110°C for 4h to obtain a monodisperse multi-cavity polymer colloid solution. Centrifuge, wash with water and ethanol, and dry to obtain a dry multi-cavity polymer. The multi-cavity polymer prepared in this example was placed in a carbonization furnace for carbonization, and the method was the same as in Example 2 to obtain multi-cavity carbon spheres.

[0037] The cavity size of multi-cavity carbon spheres obtained in this embodiment is 12 ± 2nm, the number of cavities is 10 ± 2, and the diameter of carbon spheres is 70 ± 5nm. The transmission electron microscope shows figure 2 shown.

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Abstract

The invention discloses a surface energy-driven self-assembly method for preparing multi-cavity carbon spheres and application thereof. The keys of synthesis are as follows: firstly, a nano emulsion droplet is prepared, or a Ludox is selected as a base unit; then, a polymer is pre-polymerized on the surface of the nano emulsion droplet or Ludox so as to obtain a small-size secondary structure unit with high surface energy; along with the proceeding of hydrothermal reaction, the free energy of the system is reduced to cause self-aggregation and assembly of secondary units to form an aggregate with a multi-cavity structure, and the size of each cavity and the number of cavities can be adjusted by virtue of the size of the nano emulsion droplet and the concentration of the polymer; and the multi-cavity polymer can be pyrolyzed in the space of an inert silica limited range to obtain multi-cavity carbon spheres with expanded cavity sizes. When the prepared multi-cavity carbon spheres are used as carriers, because of strong adsorption potential in the cavities, the internal cavity volume can be fully occupied and utilized by object species.

Description

technical field [0001] The present invention relates to the controllable preparation and application of multi-cavity polymer spheres and multi-cavity carbon spheres, and more specifically relates to a self-assembly method driven by surface energy to prepare cavities with adjustable diameter and controllable number of cavities Multicavity carbon nanospheres and their application as hosts to encapsulate guest species. Background technique [0002] Carbon microcapsules have the unique structural characteristics of large internal cavity volume and abundant external shell wall pores, and are recognized as an ideal carrier. The large cavity volume can achieve high encapsulation of guest species, and the external carbon wall can effectively prevent the leakage of encapsulated species, and at the same time prevent the entry of external chemical substances, ensuring the formation of a unique chemical microenvironment in the cavity. [0003] The size of the cavity relative to the mol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15C01B32/05B82Y40/00
CPCB82Y40/00C01P2004/04C01P2004/34C01P2004/64
Inventor 陆安慧张鲁华李文翠
Owner DALIAN UNIV OF TECH
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