The developed methods using tetraethoxysilane and trifunctional silanes were applied to obtain Fe 3 O 4 magnetic particles that contain amino groups with compositions of ≡Si(CH 2 ) 3 NH 2 , ≡Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , and [≡Si(CH 2 ) 3 ] 2 NH. The XRD data show that the nuclei of nanoparticles in the obtained materials preserve the structure of the primary carrier, namely, that of Fe 3 O 4 magnetite. The ther mograms show a high thermal stability of the applied surface layers, i.e., their destruction was found to start at temperature above 250°C. The DRIFT spectra indicate the formation of the silica bond framework in the surface layers of nanoparticles and also the existence of hydrogen bonds between amino groups and silanol groups with the participation of water molecules aided. All of the obtained materials exhibit magnetic prop erties and offer promising application in medicine.

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New bis(triethoxysilanes) containing a urea functional group >NC(O)N< and having the composition (C 2 H 5 O) 3 Si(CH 2 ) 3 NHC(O)NRR`[R = R`= n-C 3 H 7 ; R = H, R`= (CH 2 ) 3 Si(CH 3 )(OC 2 H 5 ) 2 ] and [(C 2 H 5 O) 3 Si(CH 2 ) 3 NHC(O)NH] 2 (C n A m ) x (A = H, x = 2, 4, 12, n = 1, m = 2; A = H, CH 3 , x = 1, n = 6, m = 4; A = H, x = 1, n = 10, m = 6) were prepared in high yields and with satisfactory purity by reactions of primary amines (or diamines) with 3-(triethoxysilyl)propyl isocyanate.

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