Phase Change Enthalpies and Entropies of Liquid Crystals Page: 1,091
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PHASE CHANGE ENTHALPIES AND ENTROPIES OF LIQUID CRYSTALS 1091
TABLE 11. The solid-liquid phase change properties of liquid crystals-Continued
Compound
STfus (erp) 0 Tfus
AHpce ~0 Stpce (exp) A Stpce
Molecular Formula Transition T (K) (kJ. mol -1) Spce (J. K-1 mol 1) (estimated) Ref.
Sol/Nem 338.8 21.7 64.05
Nem/Liq 391.8 1.21 3.09 67.14 [365]
C21H27NO N- (4-methoxybenzylidene)-4-heptylaniline
Sol/Nem 308.2 33.7 109.34
Nem/Liq 333.3 0.63 1.89 111.23 [376, 381]
Note: Temperature was calculated from published enthalpy and entropy data in paper.
C21H27NO N-(4-ethoxybenzylidene)-4-hexylaniline
Sol/Nem 312.8 25.9 82.80
Nem/Liq 350.0 0.88 2.51 85.31 [376, 381]
Note: Temperature was calculated from published enthalpy and entropy data in paper.
C21H27NO N- (4-propoxybenzylidene)-4-pentylaniline
Sol/Smec Not reported in paper
Smec/Nem 295.0 4.94 16.75
Nem/Liq 338.5 0.92 2.72 [376]
Note: Temperatures calculated from published enthalpy and entropy data in paper.
C21H27NO N-(4-butoxybenzylidene)-4-butylaniline
Sol/Sol 281.2 1.7 6.05
Sol/Smec 285.2 1.9 6.66
Smec/Smec 317.2 3.85 12.14
Smec/Nem Peak was not resolved
Nem/Liq 346.9 0.71 2.05 26.90 [376,381]
Note: Temperatures calculated from published enthalpy and entropy data in paper.
C21H27NO2 trans-4-octyloxy-3'-stilbazole-N-oxide
Sol/Smec 351.3 0.68 1.94
Smec/Smec 375.5 6.44 17.15
Smec/Liq 384.0 19.92 51.88 70.97 [278]
C21H27NO2 trans-4-octyloxy-4'-stilbazole-N-oxide
Sol/Smec 385.6 29.00 75.21
Smec/Liq 389.9 2.73 7.00 82.21 [278]
C21H27NO2S 4-isothiocyanatophenyl 4-pentylbicyclo[2.2.2]octane- 1- carboxylate
Sol/Nem 347.7 18.0 51.77
Nem/Liq 386.7 Not reported in paper NA [357]
C21H27NO3 N-(4-methoxyphenyl)-a-(4-heptyloxyphenyl)nitrone
Sol/Nem 393.2 34.86 88.66
Nem/Liq 398.2 0.92 2.31 90.97 NA [162]
C21H28FNO2 4-cyano-2-fluorophenyl trans-4-heptylcyclohexane- 1-carboxylate
Sol/Nem 349.2 35.10 100.52
Nem/Liq 365.2 Not reported in paper [197]
C21H28 N20 4-butyl-4'-pentyloxyazobenzene
Sol/Nem 315.7 11.57 36.65
Nem/Liq 338.6 0.52 1.54 38.19 113.1 [141]
C21H28 N20 4-propyl-4' -hexyloxyazobenzene
Sol/Nem 336.0 64.52 192.02
Nem/Liq 354.3 3.01 8.50 200.52 113.1 [153]
C21H28 N20 4-pentyl-4' -butoxyazobenzene
Sol/Nem 341.0 15.32 44.93Nem/Liq 360.8 1.08 2.99 47.92 113.1 [141]
C21H28N20 4-heptyl-4' -ethoxyazobenzene
Sol/Nem 320.2 19.11 59.68
J. Phys. Chem. Ref. Data, Vol. 35, No. 3, 2006Downloaded 25 Feb 2013 to 129. 120.139.109. Redistribution subject to AIP license or copyright; see http://jpcrd.aip.orgabout/rights_and_permissions
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Acree, William E. (William Eugene) & Chickos, James S. Phase Change Enthalpies and Entropies of Liquid Crystals, article, July 17, 2006; [College Park, Maryland]. (https://digital.library.unt.edu/ark:/67531/metadc172344/m1/41/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.