University of California

The deposit of aqueous solutions and of oil sprays


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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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.

Literature Cited

Ablett R. An investigation of the angle of contact between paraffin wax and water. Phil. Mag. and Jour. Sci. 1923. 46(6):244-56. DOI: 10.1080/14786442308634243 [CrossRef]

Adam N. K. The physics and chemistry of surfaces. 1930. Oxford: Clarendon Press. 332p.

Bartell F. E., Osterhof H. S. Determination of the wettability of a solid by a liquid. Jour. Indus. Engin. Chem. 1927. 19:1277-80. DOI: 10.1021/ie50215a026 [CrossRef]

Bartell F. E., Whitney C. E. Adhesion tension. A receding angle, pressure of displacement method. Jour. Phys. Chem. 1932. 36:3115-26.

Bartell F. E., Wooley A. D. Solid-liquid-air contact angles and their dependence upon the surface condition of the solid. Jour. Amer. Chem. Soc. 1933. 55:3518-27. DOI: 10.1021/ja01336a004 [CrossRef]

Ben-Amotz Y., Hoskins W. M. Factors concerned in the deposit of sprays. III. Effects of wetting and emulsifying powers of spreaders. Jour. Econ. Ent. 1937. 30:879-86.

Craig R. A simple device for short photographic exposure. Science. 1936. 84:296 DOI: 10.1126/science.84.2178.296 [CrossRef]

DeOng E. R., Knight H., Chamberlin J. C. A preliminary study of petroleum oil as an insecticide for citrus trees. Hilgardia. 1927. 2(9):351-84. DOI: 10.3733/hilg.v02n09p351 [CrossRef]

Evans A. C., Martin H. The incorporation of direct with protective insecticides and fungicides. I. The laboratory evaluation of water-soluble wetting agents as constituents of combined washes. Jour. Pomol. and Hort. Sci. 1935. 13:261-94.

Harkins W. D., Jordan H. F. A method for the determination of surface and interfacial tension from the maximum pull on a ring. Jour. Amer. Chem. Soc. 1930. 52:1751-72. DOI: 10.1021/ja01368a004 [CrossRef]

Hensill G. S., Hoskins W. M. Factors concerned in the deposit of sprays. I. The effect of different concentrations of wetting agents. Jour. Econ. Ent. 1935. 28:942-50.

Heranger S. F. La persistance des liquides et le mouillage des vegetaux. Rev. Vit. 1936. 85:449-53.

Hoskins W. M., Wampler E. L. Factors concerned in the deposit of sprays. II. Effect of electrostatic charge upon the deposit of lead arsenate. Jour. Econ. Ent. 1936. 29:134-43.

Knight H., Cleveland C. R. Recent developments in oil sprays. Jour. Econ. Ent. 1934. 27:269-89.

Lucas A. Forensic chemistry and scientific criminal investigation. 1935. Green &; Co., New York, N. Y: Longmans. 376p. DOI: 10.2307/790820 [CrossRef]

Morse W. Applied biochemistry. 1927. 2d ed. Philadelphia: W. B. Saunders &; Co. 988p.

Research Staff of the General Electric Co., Ltd., London. A problem in viscosity: the thickness of liquid formed on solid surfaces under dynamic conditions. Phil. Mag. and Jour. Sci. 1922. 44(6):1002-14. DOI: 10.1080/14786441208562577 [CrossRef]

Rideal E. K. Surface chemistry. 1926. Cambridge, England: University Press. 336p. DOI: 10.1139/v55-020 [CrossRef]

Smith R. H. The tank mixture method of using oil spray. California Agr. Exp. Sta. Bul. 1933. 527:1-86. Revised ed.

Woodman R. M. The physics of spray liquids. I. The properties of wetting and spreading. Jour. Pom. and Hort. Sci. 1924. 4:38-58.

Woodman R. M. Wetting and spreading and emulsifying agents for use with spray fluids. Jour. Soc. Chem. Indus. 1930. 49:93-98.

Hoskins W, Ben-Amotz Y. 1938. The deposit of aqueous solutions and of oil sprays. Hilgardia 12(2):83-111. DOI:10.3733/hilg.v12n02p083

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