Automated Apparatus for the Rapid
Determination of Liquid-Liquid and Solid-Liquid Phase
Transitions
S. Schrödle, R. Buchner and W. Kunz*
Fluid Phase Equil. 216 (2004) 175-182
Abstract
An automated apparatus developed for the determination of liquid-liquid and
solid-liquid equilibrium temperatures with a resolution of 1 mK and a traceable
accuracy of 0.01 K is described. The amount of light transmitted through six
sample cells placed in a computer controlled thermostat is recorded at heating
or cooling rates from 0.075 to 15 Kh-1. The construction does not require
expensive optic equipment like lasers, glass fibre optics or photomultipliers,
but is based on light emitting diodes (LED) as light sources and light
dependent resistors (LDR) or photodiodes as detectors. As shown by the
discussed examples, the instrument has awide range of possible applications
from the investigation of simple one-component and binary systems to the study
of the complicated phase behavior of surfactant solutions.
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| (c) 2004 Berger Georg |
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