Heat capacity and turbidity near the critical point of succinonitrile–water

Abstract

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Critical behavior of binary mixture of {x C6H5CN + (1 −x) CH3(CH2)12CH3}: Measurements of coexistence curves, turbidity, and heat capacity

“…The value of R B calculated from equations (27) and (28) was À0.58 ± 0.02. The value of R B calculated by equation (26) from our experimental results was À0.513 ± 0.003, which is in good agreement with the experimental values reported by Jacobs [42,43] and our previous work [15], but smaller than both the prediction of Bagnuls and Bervillier and that of equation (27).…”

Critical behaviour of binary mixture of {xC6H5CN+(1−x)CH3(CH2)7CH3}: Measurements of coexistence curves, light scattering, and heat capacity

“…(30), with a = 0.110 and D s = 0.50 yields the value of (À0.467 ± 0.002) for R þ B , which is consistent with the experimental values of (À0.50 ± 0.04) reported by Jacobs [34], but significantly differs from the theoretical prediction R þ B ¼ À0:708 [27]. The amplitude of heat capacity A + is related to the amplitude of correlation length n 0 in the one-phase region by two-scale-factor universality ratio:…”

“…It was found that the variation of 0.01 in a caused the changes of about 16%, 11%, 5%, and 1.6% in A + , A À , A + /A À , and C p0 , respectively, while the contribution of the variations of T c and E within their uncertainties to the changes of the adjusting parameters were negligible. It was reported that the theoretical predictions gave the values of A + /A À being (0.537 ± 0.019) for d = 3 expansion [1], (0.530 ± 0.003) for high-temperature series [2], (0.527 ± 0.037) for e expansion [1], and (0.55 ± 0.01) for Monte Carlo simulation [33], while the experimental values were ranged between 0.52 and 0.59 [26,28,30,32,[34][35][36][37][38][39]. The value of A + /A À determined in this study in the temperature range of ±2.8 K from the critical point is 0.533, which is in excellent agreement with the theoretical prediction of 0.530 for hightemperature series.…”

“…The value of X was predicted to be (0.01966 ± 0.00017) from an expansion of d = 3 [41], and (0.01880 ± 0.00008) from high-temperature series [2], respectively. Recent experimental determinations have found X to be in the range between 0.019 and 0.028 [28,30,34,36,39,[42][43][44]. Our measurements in the range (T À T c ) = (0 to 2.8) K gave the values of amplitude n 0 of the correlation length and amplitude A + of the heat capacity to be (0.287±0.005) nm and (0.01365 ± 0.00009) J Á K À1 Á cm À3 , respectively.…”

Critical universality and hyperscaling revisited for Ising models of general spin using extended high-temperature series

“…Finally, it is worth while to quote two recent very accurate measurements on binary mixtures: R + ξ = 0.284 (18), performed in a microgravity experiment 127 , and R + ξ = 0.265(6) obtained in a conventional environment 128 .…”