Graphene oxide microsphere and graphene microsphere and preparation methods thereof
A graphene and graphene sheet technology, applied in the field of nanomaterials or inorganic functional materials, materials science, can solve the problems of easy overlapping, inability to have a high specific surface area of graphene, application limitations, etc., and achieve easy availability of raw materials and production costs. Low, easy to control effect
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[0041] Further, in order to obtain graphene microspheres, the aforementioned preparation method may further include the following steps:
[0042] ⑶ Reduction: hydrazine hydrate reduces graphene oxide microspheres to obtain graphene microspheres.
[0043] The voltage of the applied electric field in the foregoing step (1) can be 0-30 KV to form an electrostatic field. The graphene oxide suspension droplets are affected by their own surface tension at the nozzle nozzle to maintain the crescent shape. When a high voltage is applied, under the induction of the electric field force, a large amount of electric charge is accumulated inside the graphene oxide suspension, and the droplets are subjected to a and Electric field force with the opposite surface tension. As the intensity of the electric field gradually increases, the droplet at the nozzle elongates from a spherical shape to a cone shape, which is called a Taylor cone. When the electric field strength continues to increase and ...
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[0061] Example 1:
[0062] The 12.5 mg / ml graphene oxide suspension was electrosprayed and received with stirring with 0.35 mg / ml CTAB aqueous solution. Electrostatic spray-wet collection device such as figure 1 Shown, including propulsion device, static electricity generating device and receiving device. Inhale a certain amount of graphene oxide suspension into a 2 ml plastic syringe with an inner diameter of 0.50 mm. Connect the positive pole of the high-voltage power supply to the needle tip, and ground the coagulation liquid of the receiving device. A stable jet is formed under the conditions of a bolus injection speed of 0.05 mm / min and an applied voltage of 9 KV. When the stirring speed is 2 and the CTAB concentration is 0.35 mg / ml, graphene oxide microspheres are received to obtain graphene oxide hollow microspheres. The ball is observed through a high-power optical microscope and a scanning electron microscope.
[0063] figure 2 It is an optical microscope photo of the...
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[0064] Example 2:
[0065] The 12.5 mg / ml graphene oxide suspension was electrosprayed and received with 0.55 mg / ml CTAB aqueous solution under stirring. Inhale a certain amount of graphene oxide suspension into a 2 ml plastic syringe with an inner diameter of 0.50 mm. Connect the positive pole of the high-voltage power supply to the needle tip, and ground the coagulation liquid of the receiver. A stable jet is formed under the conditions of a bolus injection speed of 0.05 mm / min and an applied voltage of 9 KV. When the stirring speed is 2 and the CTAB concentration is 0.55 mg / ml, the graphene oxide microspheres are received to obtain graphene oxide hollow microspheres. The sphere and part are graphene oxide red blood cell structures, which are observed by high-power optical microscope and scanning electron microscope.
[0066] Figure 4 It is an optical microscope photo of the above-mentioned graphene oxide microsphere. It can be seen from the figure that its size is relatively...
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