Alkyl chains acting as entropy reservoir in liquid crystalline materials

Chemical Record - Tập 3 Số 1 - Trang 29-39 - 2003
Michio Sorai1, Kazuya Saito1
1Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

Tóm tắt

AbstractThe roles played by the conformational disordering of alkyl chains in determining the aggregation states of matter are reviewed for liquid crystalline materials from a thermodynamic perspective. Entropy, which is one of the most macroscopic concepts but which has a clear microscopic meaning, provides crucial microscopic information for complex systems for which a microscopic description is hard to establish. Starting from structural implication by absolute (third‐law) entropy for crystalline solids, the existence of successive phase transitions caused by the successive conformational melting of alkyl chains in discotic mesogens is explained. An experimental basis is given for the “quasi‐binary picture” of thermotropic liquid crystals, i.e., the highly disordered alkyl chains behave like a second component (solvent). A novel entropy transfer between the “components” of a molecule and the resulting “alkyl chains as entropy reservoir” mechanism are explained for cubic mesogens. © 2003 The Japan Chemical Journal Forum and Wiley Periodicals, Inc., Chem Rec 3: 29–39; 2003: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.10046

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Tài liệu tham khảo

10.1016/0022-3697(94)00169-3

10.1016/0022-3697(94)90189-9

10.1080/00958979608023563

10.1143/JPSJ.68.1968

10.1016/S0038-1098(99)00251-3

10.1103/PhysRevB.61.4346

10.1016/S0379-6779(00)01120-6

10.1143/JPSJ.70.1635

10.1351/pac199163101503

10.1246/bcsj.74.2223

10.1021/ja00721a001

10.1039/f19736900546

10.1016/0022-3697(95)00003-8

10.1016/S0009-2614(99)01454-2

10.1103/PhysRevLett.85.4397

10.1103/PhysRevLett.86.4875

10.1016/0040-6031(85)85411-3

Sorai M., 2002, Hyper‐Structured Molecules III: Physics and Applications Chemistry, 172

10.1080/10587250008024846

Saito K., 2001, Ekisho (J Japanese Liq Cryst Soc), 5, 20

10.1007/BF02846252

10.1080/02678290110053439

10.1080/00268948008073497

Sorai M., 1980, Liquid Crystals, 41

10.1080/00268948108076261

10.1080/00268948208072130

Asahina S., 2002, J Chem Thermodynamics, 34

10.1007/BF01969171

10.1051/jphyslet:019790040019051900

10.1021/ja00258a006

10.1246/bcsj.61.2569

10.1021/j100120a041

10.1021/ma00157a022

10.1021/j100312a043

10.1063/1.455546

10.1051/jphys:019810042090130300

10.1063/1.441990

10.1051/jphys:01982004305076100

10.1063/1.444749

10.1063/1.445646

10.1002/ijch.198300049

10.1080/02678298808086390

Zamir S., 1995, Liq Cryst, 781

10.1021/j100017a057

10.1080/026782999205353

10.1080/026782999204219

10.1080/026782999204219

10.1103/PhysRevE.65.031719

10.1080/026782998206047

10.1080/02678299408027881

10.1021/jp0018652

10.1080/02678290260372655

10.1103/PhysRevE.51.5891

10.1103/PhysRevE.64.011703

10.1023/A:1021699702018

10.1111/j.1749-6632.1949.tb27296.x

10.1007/978-3-642-83133-1

10.1039/JR9570000393

10.1002/crat.19810161225

10.1080/026782998207631

10.1080/026782998205976

10.1002/9783527620555

10.1039/a902975c

10.1524/zkri.1984.168.1-4.213

10.1103/PhysRevA.38.4815

10.1080/026782900750018744

10.1021/jp9717913

Ikeuchi S.MS ThesisGraduate School of Science Osaka University:2002.

10.1103/PhysRevB.66.115110

10.1080/02678290260372646

10.1021/jp004122p

10.1016/S0009-2614(02)01535-X

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Chemical Record

Tập 3 Số 1

29-39

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