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Academic literature on the topic 'SMECTIC Ad'

Author: Grafiati
Published: 18 May 2024

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Journal articles on the topic "SMECTIC Ad"

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Shashidhar, R., B. R. Ratna, S. Krishna Prasad, S. Somasekhara, and G. Heppke. "Smectic-Ad–smectic-A2critical point." Physical Review Letters 59, no. 11 (September 14, 1987): 1209–11. http://dx.doi.org/10.1103/physrevlett.59.1209.

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Prasad, S. Krishna, R. Shashidhar, B. R. Ratna, B. K. Sadashiva, G. Heppke, and S. Pfeiffer. "Evidence of continuous evolution of smectic A2from smectic Ad." Liquid Crystals 2, no. 1 (January 1987): 111–16. http://dx.doi.org/10.1080/02678298708086643.

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Jeong, Y. H., G. Nounesis, C. W. Garland, and R. Shashidhar. "Calorimetric study of the smectic-Ad–smectic-A2critical point." Physical Review A 40, no. 7 (October 1, 1989): 4022–27. http://dx.doi.org/10.1103/physreva.40.4022.

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4

Shankar Rao, D. S., S. Krishna Prasad, V. N. Raja, S. Pfeiffer, S. Quentel, and G. Heppke. "Dielectric Behavior near a Smectic Ad- Smectic A2 Critical Point." Molecular Crystals and Liquid Crystals 198, no. 1 (April 1991): 291–97. http://dx.doi.org/10.1080/00268949108033405.

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5

Indekeu, J. O., and A. Nihat Berker. "Quadruple reentrance (nematic-smectic-Ad-nematic-smectic-Ad-nematic-smectic-A1) from the frustrated spin-gas model of liquid crystals." Physical Review A 33, no. 2 (February 1, 1986): 1158–62. http://dx.doi.org/10.1103/physreva.33.1158.

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Dabrowski, R., J. Baran, B. Sosnowska, and J. Przedmojski. "Binary Smectic Systems Including Trinuclear Pyrimidines with and without Nematic Gap." Zeitschrift für Naturforschung A 42, no. 1 (January 1, 1987): 35–42. http://dx.doi.org/10.1515/zna-1987-0107.

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Phase diagrams of binary mixtures are presented in which one component has been selected from among four trinuclear isomeric pyrimidines forming a nematic or smectic A, phase, and the second one from cyanocompounds forming an Ad smectic phase. Depending on the molecular structure of pyrimidine, mixtures were obtained that show or show not a nematic gap between the A1 and Ad smectic regions. In the latter case it was found that the relation TSA → N= f(x) has two independent branches in different ranges of the concentration x. The measured spacing of the smectic layers in such mixtures points to the possibility of the pyrimidine monolayer being transformed into a bilayer.
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Urban, Stanisław, and Albert Würflinger. "High Pressure Dielectric Studies of a Substance with the Smectic A1 Phase." Zeitschrift für Naturforschung A 54, no. 8-9 (September 1, 1999): 455–58. http://dx.doi.org/10.1515/zna-1999-8-901.

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The results of dielectric studies of 5-n-hexyl-2-(4'-isothiocyanato)-l,3-dioxane (6DBT) in the smectic A, phase at pressures up to 150 MPa and temperatures up to 340 K are presented. The low frequen-cy relaxation time τ|| (p, T) yields the activation volume Δ# V|| = RT(∂|| In τ||/p)T and activation enthalpy Δ# H|| = R(∂In τ||/∂T-1)p. The calculated values of these parameters are compared with those ob-tained recently for n-octyl-cyanobiphenyl (8CB) forming the smectic Ad phase. In the case of 6DBT both these quantities are practically constant, whereas those for 8CB decrease, when going away from the phase transitions isotropic -smectic A1 (6DBT) or nematic -smectic Ad (8CB). These differences support our earlier conclusion that increase of pressure leads to a breaking of the antiparallel associa-tions of cyanobiphenyl molecules in the smectic as well as in the nematic phases.
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Bahr, Ch, G. Heppke, and R. Shashidhar. "Smectic A1 — Smectic Ad Transition in Binary Mixtures of Compounds with Strongly Polar Terminal Groups." Zeitschrift für Naturforschung A 40, no. 12 (December 1, 1985): 1311–15. http://dx.doi.org/10.1515/zna-1985-1220.

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On the basis of high pressure studies we present here the evidence for the existence of a smectic A1 - smectic Ad transition at high pressure in a binary liquid crystal mixture consisting of terminally polar compounds. A feature of this observation is that both the constituent compounds are three phenyl ring systems wherein the bridging dipoles are disposed additive with respect to the polar end group.
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Prasad, S. Krishna, S. Pfeiffer, G. Heppke, and R. Shashidhar. "Effect of Pressure on Strongly Polar Liquid Crystals." Zeitschrift für Naturforschung A 40, no. 6 (June 1, 1985): 632–35. http://dx.doi.org/10.1515/zna-1985-0615.

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The effect of pressure on several mesogens which possess a strongly polar terminal group (CN or NO2 ) is studied. In all cases the partially bilayer smectic A (Ad) gets bounded while the nematic phase gets more stabilised at high pressures. In the case of reentrant nematogens, the maximum pressure of smectic stability is seen to be related to the temperature range of the nematic phase at 1 bar.
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10

Bouwman, Wim G., and Wim H. de Jeu. "Difference in critical behaviour of the phase transitions nematic-smectic A1 and nematic-smectic Ad." Journal de Physique II 4, no. 5 (May 1994): 787–804. http://dx.doi.org/10.1051/jp2:1994165.

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Dissertations / Theses on the topic "SMECTIC Ad"

1

Prasad, Akhileshwar. "STUDY OF THE INDUCTION OF SMECTIC Ad AND RE-ENTRANT NEMATIC PHASES IN BINARY MIXTURES OF LIQUID CRYSTALS." Thesis, University of North Bengal, 2013. http://hdl.handle.net/123456789/938.

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Conference papers on the topic "SMECTIC Ad"

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Brodzik, Marzena, and Roman S. Dabrowski. "Induction of smectic Ad phase in mixtures of polar compounds." In Liquid Crystals: Materials Science and Applications, edited by Jozef Zmija. SPIE, 1995. http://dx.doi.org/10.1117/12.215553.

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Giri, S. K., N. K. Pradham, R. Paul, S. Paul, P. Mandal, Roman S. Dabrowski, M. Brodzik, and Krzysztof L. Czuprynski. "Small-angle x-ray diffraction study of mixtures showing re-entrant nematic phase and induced smectic Ad phase." In Liquid Crystals, edited by Marzena Tykarska, Roman S. Dabrowski, and Jerzy Zielinski. SPIE, 1998. http://dx.doi.org/10.1117/12.301273.

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