The p, T - dependence of self diffusion in liquid 1-, 2- and 3-pentanol

Dynamics of two glass forming monohydroxy alcohols by field cycling 1H NMR relaxometry

“…For molecular reorientations, the temperature trends of correlation times were quite similar for the two alcohols, whereas, as already observed for the diffusion coefficients, translational correlation times had a steeper temperature dependence for 2,2-DM-1-B. This could be probably due to a complex interplay between the degree of association between molecules through hydrogen bonding, the molecular architecture, and the steric hindrance [60]. The correlation times here found for the overall reorientational motions of 2,2-DM-1-B and 3,3-DM-1-B are shorter by about one order of magnitude at the higher temperatures and by up to two orders of magnitude at the lower ones than those associated to the main Debye-like relaxation process observed by dielectric spectroscopy at the same temperatures [31,33,38,39,40,61], also reported in Figure 9 for comparison.…”

Separation of Amyl Alcohol Isomers in ZIF‐77

“…These are directionally averaged self‐diffusion coefficients. Diffusion takes place only along the z ‐direction, with the exception of 1P (Table 3S, SI) and its magnitude is similar to the one in the bulk 15. Independently from the temperature, 1P is the alcohol that diffuses the most.…”

p,T Dependence of Self-diffusion in Fluoroethanols.

“…In a series of monohydric alcohols (from methanol to pentanol) it was found that all isobars of D of one substance could well be described with a constant preexponential factor Do and a constant ratio of B/T0 [2,10]. The VTF-fit results of the three fluoroethanols under study are compiled in Table 1.…”

“…Values of A for the fluoroethanols and other alcohols may be compared with that obtained for a non-associated substance such as methane [2]. Here A is almost completely temperature independent: A= 0.925 -1.00 over a temperature range of 295-454 K. Caution should be sounded here though in connection with recent results on ammonia [12]; the presumably H-bonded liquid shows a constant A-parameter of close to 1 over a wide temperature range.…”

“…[1] These structures have a profound effect upon the selfdiffusion coefficients D. Previous work has shown that geometric, steric effects constrain the topology and rearrangement of the networks. [2] The present work looks at the effect of substitution of hydrogen by fluorine in ethanol. The strongly electron withdrawing fluorines may alter the strength and stability of the H-bonding existing through the hydroxyl group.…”