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The Escalator—An Analogy for Explaining Electroosmotic Flow

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Andrew J. Vetter and Garrett J. McGowan

Department of Chemistry, Alfred University, Alfred, NY 14802

J. Chem. Educ., 2001, 78 (2), p 209

DOI: 10.1021/ed078p209

Publication Date (Web): February 1, 2001

Section:

History, Education, and Documentation

Abstract

Capillary electrophoresis (CE) is an instrumental technique that is rapidly gaining popularity for use in the undergraduate laboratory. As a result, it becomes necessary to integrate the topic of CE into the junior/senior-level instrumental analysis course. We have developed an analogy of people on an escalator for teaching the concept of electroosmotic flow. The moving escalator is analogous to the overall bulk flow of solution through the capillary (electroosmotic flow) and partly responsible for the separation of species using CE. Students can predict the separation of people on the escalator and then correctly predict the outcome of a CE separation by using what they have learned through the analogy.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Feature):

Applications and Analogies

Keywords (Pedagogy):

Analogies / Transfer

Keywords (Subject):

Instrumental Methods

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

Capillary Electrophoresis: Focus on Undergraduate Laboratory Experiments
Lisa A. Holland
Journal of Chemical Education2011 88 (3), 254-256
- Capillary Electrophoresis: Focus on Undergraduate Laboratory Experiments
  Lisa A. Holland
  Journal of Chemical Education2011 88 (3), 254-256
  Capillary electrophoresis is a versatile technique well suited to teach concepts that are fundamental to a chemistry degree program. The applicability of capillary electrophoresis to metabolites, DNA, proteins, pharmaceutical compounds, environmental ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Weak Acid pKa Determination Using Capillary Zone Electrophoresis
Mike Solow
Journal of Chemical Education2006 83 (8), 1194
- Weak Acid pKa Determination Using Capillary Zone Electrophoresis
  Mike Solow
  Journal of Chemical Education2006 83 (8), 1194
  This article describes a general chemistry experiment designed to measure the pKa of benzoic acid using capillary zone electrophoresis. Despite the fact that modern biology relies so heavily on this analytical technique, students get very little ...
  Abstract | Hi-Res PDF | PDF w/ Links