The Rheological Properties of Organosilica Suspensions with Different Ratio of Silanol and Trymethylsilyl Groups
Journal Title: Фізика і хімія твердого тіла - Year 2014, Vol 15, Issue 2
Abstract
The rheological properties of water organosilica suspensions with different ratio of silanol and trymethylsilyl groups are investigated in the article. It is set that substitution of 50 % silanols on fumed silica surface for (CH3)3Si-groups is results in decrease of hydrophilicity coefficient of superfine silica from 2,0 to 1,4. The grafted groups change substantially the electrostatic potential distribution on SiO2 surface. The areas with negative potential appear near Si atoms of grafted groups. Suspensions of modified silicas have higher equilibrium viscosity compared to that of base silica. Superfine particles do not lose a thickening power even at destruction of their fractal structure by the ultrasonic field. New rheological properties of modified silicas are conditioned by domination on its surface areas with negative electrostatic potential, which reduces the interparticle interaction in suspension and increases the interaction of the surface with molecules of aqueous medium.
Authors and Affiliations
I. F. Myronyuk, V. I. Mandzyuk, N. A. Bezruka, Ye. P. Voronin, O. V. Goncharuk, V. M. Ogenko
Keywords
Related Articles
- EP ID EP316081
- DOI -
- Views 63
- Downloads 0
Analysis of Defect Subsystem ZnSe, Doped with Transition Metals (Co, Ni)
The crystal-quasichemical formulae of doping at the Crystals n-ZnSе:Cо(Ni) аnd p-ZnSе:Cо(Ni) are suggested. The dependence on point defects concentration, on free chargecarrier concentration and Hall concentration of the...
Crystalchemistry Models of Defect Subsystem in Nonstoichiometric Cadmium Telluride Crystals
Analysis of the defective subsystems in clean cadmium telluride was performed using methods of crystal chemistry. There were developed crystalquasichemical formulae for the non-stoichiometric n-CdTe, p-CdTe crystals, det...
Electrical Parameters of SnO2 Based Varistor Ceramics with CaO and BaO Additions
In the tested SnO2-Co3O4-Nb2O5-Cr2O3-CuO varistor ceramics the adding of CaO or BaO oxides leads to the decrease of the electric conductivity in the low electric field and correlated increase of the potential barrier hei...
Microstructure and Properties of AlCrCoNiCuFeх (х =0 – 2.0) High-Entropy Alloys
AlCrCoNiCuFeх (x values in molar ratio, x = 0; 0,5; 1,0; 2) high-entropy alloys were prepared using a vacuum arc melting method. The effects of Fe addition on microstructure and mechanical properties were investigated. T...
Optical Studies of the Interactions CdS and CdTe Nanoparticles with a Human Serum Albumin
The interaction between CdS , CdTe nanoparticles and human serum albumin (HSA) was studied by absorption and photoluminescence spectroscopy. The performed transmission electron microscopy (TEM) analysis suggests of spher...