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A recording, air‐bearing torsion pendulum
Author(s) -
Rodriguez F.,
Van Brederode R. A.,
Cocks G. G.
Publication year - 1968
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1968.070121104
Subject(s) - torsion pendulum clock , pendulum , torsion (gastropod) , oscillation (cell signaling) , moduli , amplitude , physics , bearing (navigation) , torsion spring , mechanics , modulus , materials science , inertial frame of reference , cone (formal languages) , acoustics , optics , classical mechanics , composite material , mathematics , chemistry , medicine , biochemistry , surgery , quantum mechanics , astronomy , algorithm
A recording torsion pendulum has been designed which allows the measurement of storage modulus and loss modulus for weak gels. The gel is held in a cone–plate geometry. The 5° cone, along with the inertial elements of the pendulum, is supported by an air‐lubricated bearing. The decay of oscillations is sensed by a Proximeter which does not touch the moving apparatus and which converts the amplitude of oscillation into a de signal of several volts. Storage moduli as low as 40 dyn/cm 2 and log decrements as low as 0.0054 have been measured.