The deposit of aqueous solutions and of oil sprays

Hoskins, W; Ben-Amotz, Y

The deposit of aqueous solutions and of oil sprays

Authors

W. M. Hoskins
Y. Ben-Amotz

Authors Affiliations

W. M. Hoskins was Associate Professor of Entomology and Associate Entomologist in the Experiment Station; Y. Ben-Amotz was Graduate student, University of California, August, 1933 to May, 1937.

Publication Information

Hilgardia 12(2):83-111. DOI:10.3733/hilg.v12n02p083. November 1938.

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Abstract

Abstract does not appear. First page follows.

Introduction

The value of a spray oil as an insecticide is largely dependent upon the amount of oil deposited when an emulsion containing the oil is sprayed upon an insect or upon the surface of a plant infested by the insect. Care regarding the quality of the oil, uniformity of the emulsion, and thoroughness of application is obviously of little use if the deposition of oil over the sprayed surface is insufficient, excessive, or uneven.

Previous workers who have studied the behavior of spray-oil emulsions have laid emphasis upon various properties, such as surface tension of the aqueous phase, interfacial tension between the two phases, stability of the emulsion, size of the oil droplets, angle of contact formed when the emulsion or its aqueous phase is placed upon a solid, and other analogous properties. The experiments which have been in progress in this laboratory for several years have led to the opinion that the chief importance of these properties for the deposit of oil lies in their effects upon the relative ease with which the aqueous and the oil phases make and maintain contact with the surface sprayed. During the application of an oil emulsion to a solid, and for some time thereafter, there is competition for room upon the surface of the solid. If the aqueous phase either makes contact everywhere first or is able to displace oil which has reached the surface, the end result will be little or no deposit of the oil.

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