Accession Number:

AD0671010

Title:

INVESTIGATION OF THE FORCE OF ADHESION BETWEEN POWDER PARTICLES.

Descriptive Note:

Special rept.,

Corporate Author:

AEROJET-GENERAL CORP DOWNEY CALIF ORDNANCE DIV

Report Date:

1963-03-31

Pagination or Media Count:

41.0

Abstract:

The technique used by Cremer and her associates has been further developed. It is shown that the technique yields the force of adhesion between powder particles and that this force is proportional to the surface area of the individual particles. Measurements on silica sand have been conducted at various relative humidities of the air in the range 0.5 to 7. The force constant is proportional to the relative humidity in the range 3 to 7. This indicates adhesion by hydrogen bonding between surface water and OH groups in the silica. In the range 0 to 3 relative humidity, the force constant is much larger than according to this law and closely resembles the corresponding curve for the charge on glass as a result of friction. The force constant is zero at zero humidity and shows a maximum at 2.2 relative humidity. The adhesion in this region is caused by electrostatic forces. Author

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE