The determination of the phase transition temperatures of a semifluorinated liquid crystalline biphenyl ester by impedance spectroscopy as an alternative method

2016 ◽  
Vol 503 ◽  
pp. 152-156 ◽  
Author(s):  
Alptekin Yıldız ◽  
Nimet Yilmaz Canli ◽  
Gürkan Karanlık ◽  
Hale Ocak ◽  
Mustafa Okutan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Impedance Spectroscopy ◽  
Liquid Crystalline ◽  
Transition Temperatures ◽  
Alternative Method ◽  
Phase Transition Temperatures

Liquid Crystalline Norcholesterylesters: Influence of the Axial Methylgroups on the Phase Transitions and the Cholesteric Helix

1989 ◽  
Vol 44 (11) ◽  
pp. 1127-1130 ◽  
Author(s):  
H. Stegemeyer ◽  
K. Siemensmeyer ◽  
W. Sucrow ◽  
L. Appel
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Liquid Crystalline ◽  
Helical Structure ◽  
Transition Temperatures ◽  
Phase Transition Temperatures

Liquid crystalline norcholesteryl anisic esters were prepared in which the methylgroups 19, 21, 27, and 18 are removed successively from the cholestene skeleton. The influence of the axial methylgroups on the phase transition temperatures and the choleric helical structure has been investigated. On heating the 18.19.21.27-tetranorcholesteryl ester, at 155 °C an inversion of the helical screw sense from left to right was observed

Determination of phase transition temperatures of lipids by light scattering

2006 ◽  
Vol 139 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Nicolas Michel ◽  
Anne-Sylvie Fabiano ◽  
Ange Polidori ◽  
Robert Jack ◽  
Bernard Pucci
Keyword(s):  
Phase Transition ◽  
Light Scattering ◽  
Transition Temperatures ◽  
Phase Transition Temperatures

Dilatometric Study on Phase Transitions of Benzylidene-p-n-hexadecyl /Hexadecyloxy Anilines (5.O16, 5O.O16 and 5.16)

2011 ◽  
Vol 181-182 ◽  
pp. 67-70
Author(s):  
M. Ramakrishna Nanachara Rao ◽  
P.V. Datta Prasad ◽  
D. Madhavi Latha ◽  
V.G.K.M. Pisipati
Keyword(s):  
Phase Transition ◽  
Schiff Base ◽  
Phase Transitions ◽  
Liquid Crystalline ◽  
The Body ◽  
Phase Identification ◽  
Transition Temperatures ◽  
Phase Transition Temperatures ◽  
Characterization Studies ◽  
Density Results

Synthesis, characterization and phase transition studies (Dilatometry) have been carried out on three mesomorphic Schiff base compounds viz., N-(p-n-pentyl benzylidene)-p-n-hexadecyloxy aniline, 5.O16, N-(p-n-pentyloxy benzylidene)-p-n-hexadecyloxy aniline 5O.O16 and N-(p-n-pentyl benzylidene)-p-n-hexadecyl aniline, 5.16. The liquid crystalline phase identification and the phase transition temperatures have been carried out using SDTECHS polarising microscope attached with temperature controller with accuracy of ± 0.1 °C and for the conformation of the phase identification and the textures observed are compared with the standard textures. Further, the phase transition temperatures and the corresponding heats of transition across the phase transitions are recorded using DSC (Perkin Elmer). The characterization studies reveal that these compounds exhibit NG, N and A phase variants respectively. The nature of the phase transitions are studied through density results using dilatometric technique. The phase transitions exhibit first order nature in all the cases as expected. The results are discussed in the light of the body of the data available on other Schiff base compounds and on 5O.16.

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