METHOD OF DEPOSITING DIAMOND PHASE NUCLEATION CENTRES ONTO SUBSTRATE Russian patent published in 2010 - IPC C30B25/18 C30B29/04 C23C16/02 

FIELD: chemistry.

SUBSTANCE: method involves preparation of a suspension with weight concentration of nanodiamond particles in a water-based solution selected from the relationship: K=α(ρ_a/ρ_b)(r/R)₃, feeding the suspension into a gas stream having spraying nozzle velocity from 100 m/s to 400 m/s in order to spray the suspension of nanodiamond particles and deposit them onto a substrate placed at a distance from the sprayer equal to 1-2 times its diametre for a period of time defined the relationship: t=(Sr)/(β(ρ_b/ρ_a)KQ), where: K is the weight concentration of nanodiamond particles in the suspension, wt %; a is a coefficient 1≤α≤10; ρ_a is density of nanodiamond particles, ρ_a=3.2 g/cm³; ρ_w is density of water, ρ_w=1 g/cm³; r is average radius of the nanodiamond particles, r=(4-15) nm; R is average radius of the sprayed droplets, R=(0.5-10) mcm; t is time for depositing the particles, min; β is a coefficient of proportionality, 0.05≤β≤0.1; S is surface area of the substrate, cm²; Q is flow rate of the suspension, Q=(0.06-6.0) cm³/min.

EFFECT: higher efficiency of depositing diamond phase nucleation centres onto a substrate owing to increase in their surface density and uniformity of deposition with technologically expedient deposition time.

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