Extremely fine powder developed by constant temperature drying method
The AMP yield of tar pitch after oxidation by mixed acid is 120-130. The increase in AMP mass is mainly due to the increase of heteroatom content after oxidation reaction. In order to examine the existence of these increased heteroatoms and characteristic functional groups and their changes during carbonization.
X-ray diffraction analysis is an XRD pattern of nano-carbon powder and nano-carbon powder. It can be seen that the nano carbon powder is at 2=25°.
There is a diffraction peak that is narrower and more symmetrical. The peak is a characteristic diffraction peak of the graphite 002 surface, and the d002 value is 0.3472 nm.
Comparing the d002 value of graphite (0.3354 nm), it indicates that the carbon structure of the nano-carbon powder is an amorphous carbon structure. For the nano-carbon powder, the diffraction peak of 2=25° is obviously widened, and it shifts to the left, and the d002 value increases from 0.3472nm to 0.3723nm.
It shows that the carbon structure of nano carbon powder becomes more disordered. At the same time, a new peak appeared in the nano carbon powder near 2=43°, which is the 100-sided characteristic diffraction peak of graphite, indicating the presence of structurally ordered graphite crystallites in the nano-carbon powder. It can be inferred that the carbon structure of the nano-carbon powder is a disordered layered graphite structure.
Infrared spectroscopy Fig.1FT-IRspectra shows that in the spectrum a of the raw asphalt, the absorption peak of 3300-3500 cm-1 is attributed to the stretching vibration of hydroxyl and hydrogen bonds; the absorption peak of 3030 cm-1 belongs to the aromatic ring C-H Telescopic vibration; 2900～2970cm-1
And the absorption peak of 1440cm-1 is attributed to the "CH2" and "CH3 stretching vibration and deformation vibration of an alkane or a cycloalkane; the strong absorption peak near 1600cm-1 is attributed to the stretching vibration of the aromatic ring CC skeleton; and the vibration peak of 700 to 860cm-1 The C-H isotropic phase-bound bending vibration attributed to the substituted aromatic ring. It can be seen that the raw material high-temperature pitch is mainly composed of an aromatic compound and contains an alkane side chain.
TEM analysis of nano-carbon powder In order to examine the shape, surface morphology and dispersion of nano-carbon powder, it was observed and analyzed by transmission electron microscopy (TEM), and the results are shown. It can be seen that the nano-carbon powder particles obtained by heat treatment at 950 °C are relatively uniform and regular, and the shape is similar to a spherical shape. It is found by size enlargement that the contour of the nano-carbon powder particles is relatively clear, and the average particle size is
Around 20nm, the distribution is relatively uniform, but the particle agglomeration is more serious. This is mainly due to the bonding and melting between the nanoparticles during the carbonization process. In order to avoid the bonding in the particles and affect the final structure of the nano-carbon powder, this study is currently trying to reduce the cohesiveness of the nano-carbon powder by means of pre-oxidation to improve the dispersibility of the nano-carbon powder. Preliminary results indicate The use of pre-oxidation method has a certain effect on improving the agglomeration of nano-carbon powder.
It is feasible to prepare the nano-carbon powder by drying the gel at room temperature. The obtained nanoparticles have a loose appearance structure and a clear particle profile, and the distribution is relatively uniform, and the particle size is about 20 nm.
HUMGINE products: electric thermostatic blast drying oven, high temperature oven, vacuum drying oven, nitrogen filling oven, clean oven, high temperature oven,
Box, glue defoaming box, epoxy defoaming box, high temperature box.
The AMP yield of tar pitch after oxidation by mixed acid is 120-130. The increase in AMP mass is mainly due to the increase of heteroatom content after oxidation reaction. In order to examine the existence of these increased heteroatoms and characteristic functional groups and their changes during carbonization.
X-ray diffraction analysis is an XRD pattern of nano-carbon powder and nano-carbon powder. It can be seen that the nano carbon powder is at 2=25°.
There is a diffraction peak that is narrower and more symmetrical. The peak is a characteristic diffraction peak of the graphite 002 surface, and the d002 value is 0.3472 nm.
Comparing the d002 value of graphite (0.3354 nm), it indicates that the carbon structure of the nano-carbon powder is an amorphous carbon structure. For the nano-carbon powder, the diffraction peak of 2=25° is obviously widened, and it shifts to the left, and the d002 value increases from 0.3472nm to 0.3723nm.
It shows that the carbon structure of nano carbon powder becomes more disordered. At the same time, a new peak appeared in the nano carbon powder near 2=43°, which is the 100-sided characteristic diffraction peak of graphite, indicating the presence of structurally ordered graphite crystallites in the nano-carbon powder. It can be inferred that the carbon structure of the nano-carbon powder is a disordered layered graphite structure.
Infrared spectroscopy Fig.1FT-IRspectra shows that in the spectrum a of the raw asphalt, the absorption peak of 3300-3500 cm-1 is attributed to the stretching vibration of hydroxyl and hydrogen bonds; the absorption peak of 3030 cm-1 belongs to the aromatic ring C-H Telescopic vibration; 2900～2970cm-1
And the absorption peak of 1440cm-1 is attributed to the "CH2" and "CH3 stretching vibration and deformation vibration of an alkane or a cycloalkane; the strong absorption peak near 1600cm-1 is attributed to the stretching vibration of the aromatic ring CC skeleton; and the vibration peak of 700 to 860cm-1 The C-H isotropic phase-bound bending vibration attributed to the substituted aromatic ring. It can be seen that the raw material high-temperature pitch is mainly composed of an aromatic compound and contains an alkane side chain.
TEM analysis of nano-carbon powder In order to examine the shape, surface morphology and dispersion of nano-carbon powder, it was observed and analyzed by transmission electron microscopy (TEM), and the results are shown. It can be seen that the nano-carbon powder particles obtained by heat treatment at 950 °C are relatively uniform and regular, and the shape is similar to a spherical shape. It is found by size enlargement that the contour of the nano-carbon powder particles is relatively clear, and the average particle size is
Around 20nm, the distribution is relatively uniform, but the particle agglomeration is more serious. This is mainly due to the bonding and melting between the nanoparticles during the carbonization process. In order to avoid the bonding in the particles and affect the final structure of the nano-carbon powder, this study is currently trying to reduce the cohesiveness of the nano-carbon powder by means of pre-oxidation to improve the dispersibility of the nano-carbon powder. Preliminary results indicate The use of pre-oxidation method has a certain effect on improving the agglomeration of nano-carbon powder.
It is feasible to prepare the nano-carbon powder by drying the gel at room temperature. The obtained nanoparticles have a loose appearance structure and a clear particle profile, and the distribution is relatively uniform, and the particle size is about 20 nm.
HUMGINE products: electric thermostatic blast drying oven, high temperature oven, vacuum drying oven, nitrogen filling oven, clean oven, high temperature oven,
Box, glue defoaming box, epoxy defoaming box, high temperature box.
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