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A Diode-Laser Based Automated Timing Interface for Rapid Measurement of Liquid Viscosity
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Abstract
We describe an exercise in experimental design suitable for the undergraduate laboratory, involving the construction of an automated timing interface for laminar liquid flow in glass. In many instructional physical chemistry laboratories, viscometry is introduced through measurements on polymer solutions using the principle of laminar flow. The design and construction of the interface are both part of the exercise. The digital timing scheme allows high relative precision even with very short (1s) flow times, making the use of smaller sample volumes feasible.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Physical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
LiquidsCiting Articles
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This article has been cited by 4 ACS Journal articles (4 most recent appear below).
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C. Molina , L. Victoria and A. ArenasJournal of Chemical Education2004 81 (9), 1333We describe how light-emitting diodes (LEDs) and photodiodes coupled to optic fibers can be applied to study the dependence of viscosity of various liquids solutions on temperature using a commercially-available viscosimeter (Ostwaltd). The experimental ...
A Multipurpose Apparatus To Measure Viscosity and Surface Tension of Solutions. The Measurement of the Molecular Cross-Sectional Area of n-Propanol.
Xin Zhang , Shouxin Liu and Baoxin Li , Fan Zhang , Na AnJournal of Chemical Education2004 81 (6), 850A Multipurpose Apparatus To Measure Viscosity and Surface Tension of Solutions. The Measurement of the Molecular Cross-Sectional Area of n-Propanol.
Xin Zhang , Shouxin Liu and Baoxin Li , Fan Zhang , Na AnJournal of Chemical Education2004 81 (6), 850A multipurpose apparatus is described that can be used to measure the viscosity of a solution by the Ostwald method and the surface tension by either the capillary-rise or the drop-weight method. The apparatus allows for measurement of a set of solutions (...
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- Received: August 03, 2009
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