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Electrical and Dielectric Behaviour at the Critical Point of Binary Liquids: Acetonitrile + Cyclohexane

Jayalakshmi, V and Guha, S and Gopal, ESR (1989) Electrical and Dielectric Behaviour at the Critical Point of Binary Liquids: Acetonitrile + Cyclohexane. In: Berichte der Bunsen-Gesellschaft für Physikalische Chemie, 93 (4). pp. 513-520.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/bbpc.19...


The electrical capacitance and resistance of the binary liquid mixture cyclohexane + acetonitrile are measured in the one phase and two phase regions at spot frequencies between 5 kHz and 100 kHz. This sample has a very low gravity affected (∼0.6 mK) region. In one phase region the capacitance data show a sharp, ∼0.7% increase above background within 0.5 degrees of Tc whereas the resistance has a smooth increase of ∼1.5% above background in a (T−Tc) range of 4 degrees. Two phase values of capacitance and resistance from the coexisting phases are used to determine the critical parameters Tc (critical temperature), Rc (resistance at Tc) and Cc (capacitance at Tc). A precise knowledge of these parameters reduces the uncertainty on the critical exponent 0 for C and R. The one phase capacitance data fit to an (1 - α) exponent in a limited temperature range of 0.2 degrees. Resistance data strongly support an (1 - α) exponent over the entire 5 degree range.

Item Type: Journal Article
Publication: Berichte der Bunsen-Gesellschaft für Physikalische Chemie
Publisher: VCH Publishers inc
Additional Information: Copyright of this article belongs to VCH Publishers inc.
Keywords: Critical Phenomena;Electrical Properties;Liquids;Phase Transitions;Transport Properties.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Aug 2010 06:13
Last Modified: 25 Aug 2010 06:13
URI: http://eprints.iisc.ac.in/id/eprint/31374

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