METHOD OF DETERMINING CONCENTRATION AND AVERAGE SIZE OF NANOPARTICLES IN SOL Russian patent published in 2013 - IPC G01N15/02 B82B1/00 

FIELD: nanotechnology.

SUBSTANCE: reference samples with the predetermined initial concentration of nanoparticles are produced. Infrared spectra of the reference samples are recorded, the characteristic absorption peaks are identified. The infrared spectra of the reference samples are recorded during the coagulation process, the experimental dependence of the transmission coefficient of infrared radiation is created on the basis of the coagulation time. The infrared spectra of the reference samples are recorded and the concentrations C and the size of the nanoparticles d are determined according to the relations $$C\left(T\right)=\frac{C_0}{1+C_0\tau \left(T\right)K},$$ $$d\left(T\right)=\alpha {\chi }^{\frac{\ln \left(1+K\cdot C_0\cdot \tau \left(T\right)\right)}{\ln \left(\xi \right)}},$$ $$C_0=\frac{{\rho }_c{V}_c{N}_A}{M_c{V}_{sol}},$$ $$K=\frac{4kT}{3\eta }\psi ,$$ where C₀ is the initial concentration of the nanoparticles in the sol, K is the coagulation constant determined by the sol composition; ρ_c is the density of the sol component forming the nanoparticles; V_c is the volume of the sol component forming the nanoparticles; N_A is the Avogadro's number; M_c is the molar mass of the sol component forming the nanoparticles; U_sol is the amount of the sol; k is the Boltzmann constant; T=29S K is the temperature; η is the dynamic viscosity of the solution; ψ=10^-9 is the parameter characterising the effective probability of collision of the nanoparticles with each other; α is the size of the molecule forming the nanoparticle; χ=3 is growth coefficient in the diameter of the nanoparticle in the coagulation process; ξ=13 is the constant related to the fractality of the nanoparticle; τ(T) is the approximation of the experimental dependence of the transmission coefficient of infrared radiation through the sol on the basis of time.

EFFECT: creation of the method of determining the concentration and the average size of nanoparticles in sol undergoing coagulation by IR-spectroscopy.

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