Homogeneous nucleation rates of 1-pentanol

Abstract

We have measured isothermal homogeneous nucleation rates J for 1-pentanol vapor in two different carrier-gases, argon, and helium, using a two-valve nucleation pulse chamber. The nucleation rates cover a range of 10(5)<J/cm(-3) s(-1)<10(9) at temperatures between 235<T/K<265. We observed no influence of the carrier gas on location and slope of the nucleation rate isotherms. These measurements are part of an international effort to examine 1-pentanol using various experimental techniques, which was initiated in Prague in 1995. In the present paper nucleation rate data obtained by several groups are compared to each other and to the classical nucleation theory. As expected, the classical theory is not able to quantitatively predict the experimental results. Nevertheless, relating the experimental data to the classical theory provides a suitable way to compare data of widely differing nucleation rates obtained by different experimental techniques. This comparison helps judging mutual support of the data and, at the same time, provides a rather interesting insight into the accuracy of the individual experimental techniques.

Communication: Tolman length and rigidity constants of water and their role in nucleation

“…44 While the standard CNT typically predicts the correct dependence of nucleation rates on supersaturation, it gives the wrong temperature-dependence. For substances such as water and 1-pentanol, this has been well documented, 1,7,45 and it is also evident from comparing the red dashed lines in Fig. 2 with the experimental results.…”

Exploring the discrepancies between experiment, theory, and simulation for the homogeneous gas-to-liquid nucleation of 1-pentanol

“…Their data are depicted together with our simulation data in Fig. 7 From this figure, an interesting coincidence between our simulation results and the experimental data of Iland et al 1 and Hruby et al 10 can be noticed, i.e., a very good agreement of the slope, but a near-constant shift to larger differences from CNT for the simulation data when the B͑T͒ effect is included. 1 Although the experimental results ͑using various techniques͒ coincide at 260 K, the temperature dependence of the nucleation rate ratio is rather inconsistent.…”

“…6 in Ref. 1 Although the experimental results ͑using various techniques͒ coincide at 260 K, the temperature dependence of the nucleation rate ratio is rather inconsistent. Their data are depicted together with our simulation data in Fig.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12] Significant inconsistencies between measurements using different techniques and disagreement between theoretical predictions and experimental results have been observed in the past. Experimentally, nucleation rate measurements are carried-out using a plethora of techniques.…”

Investigation of The Nucleation and Growth of Methanol Clusters from Supersaturated Vapor by Molecular Dynamics Simulations

“…The effect of the amount and type of carrier gas has been investigated in the past in experiments and simulation. In experimental work on 1-pentanol gas-liquid nucleation using an expansion chamber, no influence of the choice of the two different types of carrier gases argon and helium has been found (48). On the other hand, Brus et al (49) have investigated the nucleation of 1-pentanol in a laminar flow diffusion chamber and found that the nucleation rates in argon are shifted to lower supersaturations than in helium.…”