Determination of Specific Surface of Sieve-Size Powders

1955 ◽  
Vol 27 (2) ◽  
pp. 302-305 ◽  
Author(s):  
Bernard Dubrow ◽  
Mary Nieradka
Keyword(s):  
Specific Surface ◽  
Sieve Size

Measurement of Complex Dielectric Permittivity of Quartz Systems

2019 ◽  
Vol 946 ◽  
pp. 129-133
Author(s):  
Vitaly Smolko ◽  
Elizaveta Antoshkina
Keyword(s):  
Aqueous Solution ◽  
Dielectric Permittivity ◽  
Polyvinyl Alcohol ◽  
Specific Surface ◽  
Ultrasonic Treatment ◽  
Complex Dielectric Permittivity ◽  
Active Centers ◽  
Sand Surface ◽  
Quartz Sands

The article describes the problem of the experimental determination of complex dielectric permittivity for natural, activated, and modified quartz systems. The results of determination of specific surface, complex dielectric permittivity, sands porosity are presented in this article. The authors obtained the empirical equation of complex dielectric permittivity calculation for natural, activated, and modified quartz sands, taking into account the effect of moisture, specific surface, porosity, impurities content into consideration. The modification of the sand surface by means of mechanical beneficiation and ultrasonic treatment leads to reduction of complex dielectric permittivity and specific surface, thus contributing to the increase of the active centers quantity on the sands surface. The modification of the sand surface by polyvinyl alcohol aqueous solution leads to increase of complex dielectric permittivity. Polyvinyl alcohol aqueous solution modification envisages the creation of new active centers by oligomers inoculation to the surface and blocking the clay component and authigenous film ingredients. Among the considered methods, ultrasonic treatment in aqueous solution and mechanical beneficiation are the most efficient and technologically acceptable ways of activation.

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