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Dehghani A, Hendi S, Mann R. Range of novel black hole phase transitions via massive gravity: Triple points and
N
-fold reentrant phase transitions. Int J Clin Exp Med 2020. [DOI: 10.1103/physrevd.101.084026] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Mukherjee PK. Reentrant nematic and tricritical behavior of the nematic to smectic-A phase transition in liquid crystal mixture. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2014.06.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Sasaki Y, Ema K, Le KV, Takezoe H, Dhara S, Sadashiva BK. Calorimetric study of the effect of bent-shaped dopant molecules on the critical behavior at the nematic-smectic-Ad phase transition. Phys Rev E 2011; 83:061701. [PMID: 21797381 DOI: 10.1103/physreve.83.061701] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 03/29/2011] [Indexed: 11/07/2022]
Abstract
We report results of calorimetric studies for the binary mixture of rodlike host n-alkyloxy-cyanobiphenyl (nOCB, n=8,9) and bent-shaped guest 1,3-phenylene-bis[4-(3-methylbenzoyloxy)]-4'-n-dodecylbiphenyl-4'-carboxylate (BC12). The effect of bent-shaped dopant molecules on the critical behavior associated with the nematic-smectic-A(d) phase transition has been studied in detail. The transition temperature for the nematic-smectic-A(d) phase sharply decreases as the increase of the mole fraction of the dopant concentration (denoted X for the BC12/9OCB mixture and Y for the BC12/8OCB mixture). The dependence of the critical exponent α on X and Y is well explained in terms of the McMillan ratio. A nearly tricritical exponent has been obtained for the X=0.01 mixture. X=0.02-0.03 mixtures, pure 8OCB, and Y=0.01-0.03 mixtures exhibit nonuniversal behaviors with effective exponents lying between the 3D-XY and tricritical exponents. The heat capacity anomaly for Y=0.05 has been well described with the 3D-XY exponent. The critical amplitude ratio A(-)/A(+) is close to 1 and insensitive to the dopant concentration. No Fisher renormalization of the critical exponent has been observed even for nearly tricritical compositions, which indicates the smallness of the concentration plays a decisive role rather than the steepness of the N-SmA(d) phase boundary.
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Affiliation(s)
- Y Sasaki
- Department of Physics, Tokyo Institute of Technology, O-okayama, Meguro, Japan
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Cusmin P, Salud J, López DO, de la Fuente MR, Diez S, Pérez-Jubindo MA, Barrio M, Tamarit JL. Re-entrant nematic behavior in the 7OCB+9OCB mixtures: evidence for multiple nematic-smectic tricritical points. J Phys Chem B 2006; 110:26194-203. [PMID: 17181276 DOI: 10.1021/jp0642286] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The metastable phase diagram of the two-component system heptyloxycyanobiphenyl (7OCB)+nonyloxycyanobiphenyl (9OCB) was determined by means of modulated differential scanning calorimetry (MDSC) and optical microscopy measurements. It was experimentally established that the 7OCB+9OCB two-component system exhibits a monotropic re-entrant nematic behavior. A complete quantitative thermodynamic analysis, through Oonk's equal G analysis, was performed, allowing for the calculation of the monotropic re-entrant behavior and the prediction of two tricritical points, one of them experimentally accessible for the SmAd-to-N transition and the other non-experimentally accessible for the RN-to-SmAd transition. From specific-heat measurements, latent heats were obtained for those mixtures displaying a first-order SmAd-to-N transition. Additionally, for some mixtures, the specific-heat critical exponents (alpha), through the second-order SmAd-to-N transition, were obtained. Both batches of data enable us to access to the experimental tricritical temperature for the SmAd-to-N transition.
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Affiliation(s)
- Paul Cusmin
- Laboratori de Caracterització de Materials, Departament de Física i Enginyeria Nuclear, E.T.S.E.I.B. Universitat Politècnica de Catalunya, Diagonal, 647 08028 Barcelona, Spain
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Bemrose RA, Care CM, Cleaver DJ, Neal MP. Computer Simulation of Bi-Disperse Liquid Crystals: The Effect of Concentration on Phase Behaviour and Structurai. Properties. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259708041969] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- R. A. Bemrose
- a Materials Research institute, Sheffield Hallam University , Pond Street, Sheffield , S1 1WB , UK
| | - C. M. Care
- a Materials Research institute, Sheffield Hallam University , Pond Street, Sheffield , S1 1WB , UK
| | - D. J. Cleaver
- a Materials Research institute, Sheffield Hallam University , Pond Street, Sheffield , S1 1WB , UK
| | - M. P. Neal
- b Department of Mathematics and Computing , University of Derby , Kedleston Road, DE22 1GB , UK
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Han XF, Wang ST, Cady A, Radcliffe MD, Huang CC. Double reentrance of surface arrangements in freestanding liquid crystal films. PHYSICAL REVIEW LETTERS 2003; 91:045501. [PMID: 12906671 DOI: 10.1103/physrevlett.91.045501] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2003] [Indexed: 05/24/2023]
Abstract
The molecular arrangement of tilted surface layers on freestanding films above the bulk smectic-A-smectic-C(*) transition has been studied by null transmission ellipsometry. In the presence of an applied in-plane electric field, a synclinic-anticlinic-synclinic-anticlinic double reentrance has been observed. Furthermore, we have characterized a novel transition from the synclinic arrangement to a structure in which the interior layers tilt in the same orientation and the outermost surface layers tilt oppositely with the interior layers.
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Affiliation(s)
- X F Han
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Sied MB, Salud J, López DO, Allouchi H, Díez S, Tamarit JL. Reentrant Behavior in Binary Mixtures of (Octyloxy)cyanobiphenyl (8OCB) and the Shorter Chain Homologue (Heptyloxy)cyanobiphenyl (7OCB). J Phys Chem B 2003. [DOI: 10.1021/jp021649o] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mohamed B. Sied
- Laboratori de Caracterització de Materials (LCM), Departament de Física i Enginyeria Nuclear, ETSEIB Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain, Laboratoire de Chimie Physique, Faculté de Pharmacie, 31 avenue Monge, F-37200 Tours, France, and Departamento de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain
| | - Josep Salud
- Laboratori de Caracterització de Materials (LCM), Departament de Física i Enginyeria Nuclear, ETSEIB Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain, Laboratoire de Chimie Physique, Faculté de Pharmacie, 31 avenue Monge, F-37200 Tours, France, and Departamento de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain
| | - David O. López
- Laboratori de Caracterització de Materials (LCM), Departament de Física i Enginyeria Nuclear, ETSEIB Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain, Laboratoire de Chimie Physique, Faculté de Pharmacie, 31 avenue Monge, F-37200 Tours, France, and Departamento de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain
| | - Hassan Allouchi
- Laboratori de Caracterització de Materials (LCM), Departament de Física i Enginyeria Nuclear, ETSEIB Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain, Laboratoire de Chimie Physique, Faculté de Pharmacie, 31 avenue Monge, F-37200 Tours, France, and Departamento de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain
| | - Sergio Díez
- Laboratori de Caracterització de Materials (LCM), Departament de Física i Enginyeria Nuclear, ETSEIB Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain, Laboratoire de Chimie Physique, Faculté de Pharmacie, 31 avenue Monge, F-37200 Tours, France, and Departamento de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain
| | - Josep Ll. Tamarit
- Laboratori de Caracterització de Materials (LCM), Departament de Física i Enginyeria Nuclear, ETSEIB Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain, Laboratoire de Chimie Physique, Faculté de Pharmacie, 31 avenue Monge, F-37200 Tours, France, and Departamento de Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain
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Ema K, Kanai M, Yao H, Takanishi Y, Takezoe H. Effect of optical purity on the critical heat capacity at the smectic-A-(chiral)-smectic-C transition in an antiferroelectric liquid crystal. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 61:1585-92. [PMID: 11046441 DOI: 10.1103/physreve.61.1585] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/1999] [Revised: 10/19/1999] [Indexed: 04/15/2023]
Abstract
High resolution ac calorimetric measurements have been carried out near the smectic-A-chiral-smectic-C phase transition in the antiferroelectric liquid crystal 4-(1-methylheptyloxycarbonyl)phenyl 4(')-octyloxybiphenyl-4-carboxylate (MHPOBC). Data on samples with different optical purities have been analyzed in detail using a renormalization-group expression with corrections-to-scaling terms. The chiral-smectic-C(alpha)-chiral-smectic-C phase transition is first order, while the smectic-A-chiral-smectic-C(alpha) phase transition is second order. A direct smectic-A-chiral-smectic-C phase transition, which occurs in near-racemic mixtures, was found to be quasitricritical and weakly first order. This implies that the smectic-A-smectic-C transition in the racemate locates at a special point where four critical lines intersect.
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Affiliation(s)
- K Ema
- Department of Physics, Faculty of Science, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
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BEMROSE BRICHARDA, CARE CHRISTOPHERM, NEAL DOUGLASJCLEAVERAMAUREENP. A molecular dynamics study of a bi-disperse liquid crystal mixture using a generalized Gay–Berne potential. Mol Phys 1997. [DOI: 10.1080/002689797172345] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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10
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Wu L, Zhou B, Garland CW, Bellini T, Schaefer DW. Heat-capacity study of nematic-isotropic and nematic-smectic-A transitions for octylcyanobiphenyl in silica aerogels. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 51:2157-2165. [PMID: 9962877 DOI: 10.1103/physreve.51.2157] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Nounesis G, Kumar S, Pfeiffer S, Shashidhar R, Garland CW. Experimental observation of a transition between two uniaxial nematic liquid-crystal phases. PHYSICAL REVIEW LETTERS 1994; 73:565-568. [PMID: 10057479 DOI: 10.1103/physrevlett.73.565] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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12
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Young MJ, Wu L, Nounesis G, Garland CW, Birgeneau RJ. X-ray diffraction study of the smectic-A-tilde fluid antiphase and its transitions to smectic-A1 and smectic-A2 phases. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1994; 50:368-376. [PMID: 9961976 DOI: 10.1103/physreve.50.368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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13
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Ema K, Yao H, Kawamura I, Chan T, Garland CW. High-resolution calorimetric study of the antiferroelectric liquid crystals methylheptyloxycarbonylphenyl octyloxybiphenyl carboxylate and its octylcarbonylbiphenyl analog. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1993; 47:1203-1211. [PMID: 9960123 DOI: 10.1103/physreve.47.1203] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wu L, Garland CW, Pfeiffer S. Calorimetric study of a closed reentrant nematic region. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 46:973-980. [PMID: 9908199 DOI: 10.1103/physreva.46.973] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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15
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Frustrated Smectics. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/978-1-4612-0917-1_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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16
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Nounesis G, Garland CW, Shashidhar R. Crossover from three-dimensional XY to tricritical behavior for the nematic-smectic-A1 phase transition. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:1849-1856. [PMID: 9905226 DOI: 10.1103/physreva.43.1849] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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17
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Mahmood R, Fellner HG, Vithana HK, Huang J, Johnson DL. Heat capacity near the nematic-smectic-A transition of a weakly polar, very wide nematic range liquid crystal. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 41:6859-6865. [PMID: 9903100 DOI: 10.1103/physreva.41.6859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Fontes E, Lee WK, Heiney PA, Nounesis G, Garland CW, Riera A, McCauley JP, Smith AB. Smectic–smectic phase transitions in binary liquid‐crystalline mixtures of DB5–T8. J Chem Phys 1990. [DOI: 10.1063/1.457798] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Jeong YH, Nounesis G, Garland CW, Shashidhar R. Calorimetric study of the smectic-Ad-smectic-A2 critical point. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 40:4022-4027. [PMID: 9902622 DOI: 10.1103/physreva.40.4022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Raja VN, Ratna BR, Shashidhar R, Heppke G, Bahr C, Marko JF, Indekeu JO, Berker AN. Pressure studies on phase transitions in 4-alkoxyphenyl-4'-nitrobenzoyloxybenzoates. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 39:4341-4344. [PMID: 9901780 DOI: 10.1103/physreva.39.4341] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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