Correlations between the crystalline long c -parameter and the number of carbon atoms of pure n -alkanes

Control of n-alkanes crystallization by ethylene–vinyl acetate copolymers

“…A direct comparison with pure tetracosane is not possible because pure tetracosane is triclinic. By extrapolation of the c parameters of odd paraffins crystals which have the orthorhombic Pbcm structure [71][72][73], an estimate of the c Fig. 10.…”

Temperatures and enthalpies of (solid + solid) and (solid + liquid) transitions of n-alkanes

“…From the accurate and self-consistent data of Craig et al, (62) Chevallier et al (70) have determined linear equations for the variation of the crystalline parameter c as a function of the carbon atom number n from linear least-squares fits, particularly for the orthorhombic odd-numbered normal alkanes, in the range C 13 to C 41 , crystallizing in the C 23 key structure: (62) c/nm = 0.2544 8 …”

“…In the last equation the term {0.1272 4 (n − 1)} represents the carbon atoms chain length of an odd-numbered alkane of carbon atom number n, (70) and the slope value (0.1272 4 ) corresponds to a chain length increase per carbon atom which is equal to the average carbon-carbon distance projected onto the chain axis. (69,70) (0.3147 6 ) represents the gap value between the crystalline planes of end-methyl-group carbon atoms of two consecutive molecules layers.…”

“…(69,70) (0.3147 6 ) represents the gap value between the crystalline planes of end-methyl-group carbon atoms of two consecutive molecules layers. (63,64,66,70) For the even-numbered normal alkanes, the relationships determined by Chevallier et al (70) from the data of Craig et al (62) are as follows: For C 14 to C 26 ; triclinic key structure "C 18 − P1": c/nm = 0.126 5 · n + 0.215 6 , and for C 28 to C 36 ; monoclinic key structure "C 36 − P2 1 /a": c/nm = 0.0961 5 ·n +1.136 7 , where c is the crystalline parameter along the crystallographic axis Oz, and n is the carbon atom even-number.…”

Experimental determination and prediction of liquid-solid equilibria for binary (methyl palimitate + naphthalene) mixture

“…The rapid cooling of molten samples ensured a uniform stearic concentration of components in the mixture and homogeneity of the final molecular alloy [13,14].…”