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Measurement of Evaporation Rates of Organic Liquids by Optical Interference

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Scott A. Riley , Nathan R. Franklin , Bobbie Oudinarath , Sally Wong , David Congalton and A. M. Nishimura

Westmont College, Department of Chemistry, Santa Barbara, CA 93108-1099

J. Chem. Educ., 1997, 74 (11), p 1320

DOI: 10.1021/ed074p1320

Publication Date (Web): November 1, 1997

Section:

History, Education, and Documentation

Abstract

The He-Ne laser and the solid state laser pointer are inexpensive sources of collimated light which can be used in undergraduate laboratory experiments. In this article, the rate of evaporation is measured for several volatile organic liquids by optical interference. The laser light reflects and refracts at the air-surface interface; the latter beam then reflects at the lower liquid glass interface. These two beams are focused onto a photodiode. The optical interference occurs as a result of the different distances traveled by the two beams and the intensity at the detector oscillates as the liquid evaporates. The frequency of oscillation is used to determine the rate of evaporation.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Subject):

Instrumental Methods

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

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  Alcohol-based hand-rub sanitizers are the types of products that hospital professionals use very often. These sanitizers can be classified into two major groups: those that contain a large quantity of thickener, and thus are a gel, and those that contain ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Evaporation Kinetics in Short-Chain Alcohols by Optical Interference
Ian M. Rosbrugh , S. Y. Nishimura and A. M. Nishimura
Journal of Chemical Education2000 77 (8), 1047
- Evaporation Kinetics in Short-Chain Alcohols by Optical Interference
  Ian M. Rosbrugh , S. Y. Nishimura and A. M. Nishimura
  Journal of Chemical Education2000 77 (8), 1047
  The evaporation rates of volatile organic liquids may be determined through the observation of optical interference of spatially coincident light that is reflected from the top (air-liquid) and bottom (liquid-surface) of a liquid drop on a glass surface. ...
  Abstract | Hi-Res PDF | PDF w/ Links