By Anatolii D. Zimon (auth.), Morton Corn (eds.)
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Extra info for Adhesion of Dust and Powder
The detachment of firmly held particles takes place more intensively in the centrifugal than in the vibration methode The vibration method may be accompanied by simultaneous measurement of the electric charges arising from the detachment of the particles, these being required in order to calculate the electric component of the adhesive forces (see § 11). For this purpose we may use an apparatus  differing from those employed earlier (of the electrometer type [11, 13, 71]), using electronic and loop oscillographs.
In view of this, one is forced to use indirect methods for determining the adhesion of such particles by estimating the adhesive forces from experiments on the detachment of different particles under identical conditions. The special characteristic of these methods lies in the fact that the value of the detaching force is not calculated, hut kept constant . A variation on the vibration method is the pulse method, which we used to determine adhesion in vacuum and in the vapor of various liquids (Fig.
The detachment of the dust particles was effected by shooting pellets at the dust-laden surface from an air gun. In order to detach dust particles in liquid media, the loading method may be employed . The dust-laden surface is immersed in the test solution for a specified time interval (Fig. H). The conditions of immersion and extraction of the sampies from the solutions should be exactly the same. For removing particles from a dust-laden surface, the latter may be subjected to an air blast .
Adhesion of Dust and Powder by Anatolii D. Zimon (auth.), Morton Corn (eds.)