Low-frequency dielectric constant measurements in the critical polar + non-polar binary liquid system: Methanol + n-heptane
✍ Scribed by Jyothi Balakrishnan; M.K. Gunasekaran; E.S.R. Gopal
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 213 KB
- Volume
- 88
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The low-frequency (5-i00 kHz) dielectric constant e has been measured in the temperature range 7 × 10 -s < t = (T-Tc)/ T c < 8 × 10 -2. Near T c an exponent ~0.11 characterizes the power law behaviour of de/dt consistent with the theoretically predicted t -a singularity. However, over the full range of t an exponent -~0.35 is obtained.
The anomalous behaviour of the dielectric constant near the critical point is still a matter of some debate. Thermodynamic and statistical-mechanical arguments indicate that the temperature derivative of the dielectric constant of fluids diverges weakly at the critical point [1][2][3]. The detailed calculations [3] taking into account the corrections to scaling, give e =A 0 +Alt +A2tl-~ +A3tl-~+zi + ...,