17nm polycrystalline nanodiamond is a kind of ultra-fine and ultra-dispersed nano-sized diamond (UFDD) prepared by special processes. This nanodiamond can be suspended in water for a long time without precipitation. The particle size distribution can be divided into two types: finer than 17nm the other is finer than 10nm.
Transmission Electron Microscopy (TEM)
1)17nm
2）10nm
From the TEM the particles are spherical, single-particle size is less than 10nm, at 4-6nm, and it is a polycrystalline structure. The TEM pictures are taken when water is the dispersion medium, when taking a picture the required state is dry therefore the agglomeration state is displayed. But in the water solution-state, the particle size smaller than 10nm can be displayed with good dispersion.
Particle Size Distribution (PSD)
We use the dynamic light scattering principle device to test the particle size, device name and model is Dandong Baite Bt-90(+) nano size analyzer. The specific particle size detection results are as follows:
1)17nm
Test Results Report of Nanometer Laser Particle Size Distribution Instrument
2）10nm
Test Results Report of Nanometer Laser Particle Size Distribution Instrument
Analysis of Test Results
- 10nm: the detection concentration is O.65%, the particle size is concentrated in 6.5 nm to 10.6 nm, the particle concentration n=(D90-D10)/D50=0. 325, the particle concentration is high, D50=8.2 nm, the volume average value D [4, 3] =8.25 nm, the area average value D[3, 2]=8.13, which is very close, indicating that the particle morphology is relatively smooth.
- 17nm: the detection concentration is 1%, the particle size is concentrated in 10.1 nm to 17.2 nm, the particle concentration n=(D90-D10)/D50=0.364, the particle concentration is high, D50=12.9 nm, the volume average value D[4, 3 ]=13 nm, the area average value D[3, 2]=12.8 nm. The three values are close to each other, indicating that the particle morphology is relatively smooth.
X-ray Diffraction (XRD)
The XRD results show that the diffraction peaks at 43.7°, 75°, 90° are matched with the (111), (220) and (311crystal faces of the diamond phase, indicating that the phase composition of the material is the diamond phase.
Fourier Transform Infrared Spectrometer (FTIR)
From the FTR spectrum, it can be seen that the surface of the nano diamond is rich in hydrophilic OH functional groups, which is conducive to composite with other materials and surface modification.
UV-vis
The pictures show the effect picture of 10nm and 17nm nano diamond suspension with a laser pen. It can be seen from the picture that the nano diamond suspension is evenly dispersed and has an obvious Dingdar Effect. It is a kind of colloidal solution. The dispersion of the system is stable and can be kept stable for a long time. Up to now, it has been standing for 15 months without agglomeration and precipitation, and the PH value of the dispersed solution is low 7, neutral.
Samples Picture
10nm&17nm
