ADHESION OF SPHERICAL PARTICLES TO PLANE SURFACES
Abstract
The adhesion of spherical particles to plane glass and quartz surfaces was investigated under various humidity conditions, and compared with the results obtained using similar spheres made radioactive by the incorporation of traces of active Eu isotopes. Much stronger adhesion is found with active specimens than with inactive ones when examined in water vapour atmospheres of up to 61% R.H. The values obtained with active particles may be expressed in the empirical form Z = ke to the -sRth power, in which Z is the adhesion force of a sphere of radius R, k a parameter concerned with the dielectric constants of the surfaces in contact, and s with the humidity effect, i.e. change in the conductance of the surfaces in consequence of moisture deposition. In atmospheres of near saturation humidity, the radioactive effect is replaced by the even stronger adhesion produced by surface tension forces. A more exact theoretical treatment is offered of the adhesion of an inactive spherical particle to a plane surface than has been previously available.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 07, 1961
- Accession Number
- AD0324812
Entities
People
- H. Stretch
- N. L. Cross