scholarly journals Dynamic calorimetry and XRD studies of the nematic and twist-bend nematic phase transitions in a series of dimers with increasing spacer length

2018 ◽  
Vol 20 (39) ◽  
pp. 25268-25274 ◽  
Author(s):  
Warren D. Stevenson ◽  
Heng-xing Zou ◽  
Xiang-bing Zeng ◽  
Christopher Welch ◽  
Goran Ungar ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Nematic Phase ◽  
Modulated Dsc ◽  
Spacer Length ◽  
Dynamic Calorimetry ◽  
Transition Enthalpy ◽  
Torsion Energy ◽  
Xrd Studies

A modulated DSC study of bent dimesogens with (CH2)n spacers n = 5–11 showed that the enthalpy of the ordinary nematic is lowest for n = 11 due to the lowest C–C torsion energy needed to straighten the dimer, causing near disappearance of twist-bend-nematic to nematic transition enthalpy.

scholarly journals The Effect of Selected Anions on Dipalmitoylphosphatidylcholine Phase Transitions

2002 ◽  
Vol 57 (7-8) ◽  
pp. 712-716 ◽  
Author(s):  
Adriana Przyczyna ◽  
Bożenna Różycka-Roszk ◽  
Marek Langner
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Salt Concentration ◽  
Half Width ◽  
Main Phase ◽  
Interface Properties ◽  
Transition Enthalpy ◽  
Peak Half Width

The effect of three anions, Cl-, Br- and I-, on the phase transitions of dipalmitoylphosphatidylcholine (DPPC) was measured. Main phase transition was modestly affected by these anions in the salt concentration range 0.2 M. For Cl- and Br- the temperature of main phase transition was lower (by about 0.5 °C), its half-width modestly larger and enthalpy practically unchanged, all three parameters were altered to a much larger degree. Main phase transition temperature was 1.5 °C lower and the peak half-width significantly smaller. These changes were not accompanied by any alteration in main phase transition enthalpy. Iodide shifted the pretransition temperature toward lower values and increased its half-width to such an extent that at concentrations above 100 mm it was practically undetectable. Besides cations, the presence of anions also has a distinct effect on lipid bilayer interface properties.

Observation of Two Isotropic-Nematic Phase Transitions Near a Surface

2011 ◽  
Vol 106 (11) ◽  
Author(s):  
Satoshi Aya ◽  
Yuji Sasaki ◽  
Fumito Araoka ◽  
Kenji Ema ◽  
Ken Ishikawa ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Nematic Phase

In-situ STM and XRD studies on Nb–H films: Coherent and incoherent phase transitions

2015 ◽  
Vol 645 ◽  
pp. S388-S391 ◽  
Author(s):  
Vladimir Burlaka ◽  
Stefan Wagner ◽  
Astrid Pundt
Keyword(s):  
Phase Transitions ◽  
In Situ Stm ◽  
Xrd Studies

scholarly journals Pressure-Volume-Temperature Relations and Isotropic-nematic Phase Transitions for 4-(trans-4-Pentylcyclohexyl)benzonitrile

1983 ◽  
Vol 56 (8) ◽  
pp. 2238-2240 ◽  
Author(s):  
Hajime Ichimura ◽  
Toshiaki Shirakawa ◽  
Taneki Tokuda ◽  
Tsutomu Seimiya
Keyword(s):  
Phase Transitions ◽  
Nematic Phase
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