Analysis of rotator phase transitions in the linear alkanes hexacosane to triacontane by adiabatic scanning calorimetry and by photopyroelectric calorimetry

2018 ◽  
Vol 148 (9) ◽  
pp. 094503 ◽  
Author(s):  
S. Paoloni ◽  
F. Mercuri ◽  
U. Zammit ◽  
J. Leys ◽  
C. Glorieux ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Scanning Calorimetry ◽  
Adiabatic Scanning Calorimetry ◽  
Rotator Phase ◽  
Linear Alkanes ◽  
Photopyroelectric Calorimetry

scholarly journals Phase Transitions of Binary Lipid Mixtures: A Combined Study by Adiabatic Scanning Calorimetry and Quartz Crystal Microbalance with Dissipation Monitoring

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
P. Losada-Pérez ◽  
N. Mertens ◽  
B. de Medio-Vasconcelos ◽  
E. Slenders ◽  
J. Leys ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Phase Diagrams ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Phase Behaviour ◽  
Scanning Calorimetry ◽  
Departure Point ◽  
Peltier Element ◽  
Adiabatic Scanning Calorimetry ◽  
Lipid Mixtures

The phase transitions of binary lipid mixtures are studied by a combination of Peltier-element-based adiabatic scanning calorimetry (pASC) and quartz crystal microbalance with dissipation monitoring (QCM-D). pASC, a novel type of calorimeter, provides valuable and unambiguous information on the heat capacity and the enthalpy, whereas QCM-D is proposed as a genuine way of determining phase diagrams by analysing the temperature dependence of the viscosity. Two binary mixtures of phospholipids with the same polar head and differing in the alkyl chain length, DMPC + DPPC and DMPC + DSPC, are discussed. Both techniques give consistent phase diagrams, which compare well with literature results, showing their capability to map the phase behaviour of pure lipids as well as lipid mixtures. This work can be considered as a departure point for further investigations on more complex lipid mixtures displaying relevant phases such as the liquid-ordered phase and solid-lipid interfaces with biologically functional importance.

Investigations of phase transitions in liquid crystals by means of adiabatic scanning calorimetry

2009 ◽  
Vol 36 (6-7) ◽  
pp. 669-684 ◽  
Author(s):  
Jan Thoen ◽  
George Cordoyiannis ◽  
Christ Glorieux
Keyword(s):  
Phase Transitions ◽  
Liquid Crystals ◽  
Scanning Calorimetry ◽  
Adiabatic Scanning Calorimetry ◽  
Transitions In Liquid Crystals

Evidence from adiabatic scanning calorimetry for the Halperin-Lubensky-Ma effect at the N-SmA phase transitions in mixtures of 7OCB+heptane with an injected SmA phase

2012 ◽  
Vol 35 (7) ◽  
Author(s):  
C. S. P. Tripathi ◽  
P. Losada-Pérez ◽  
J. Leys ◽  
G. Cordoyiannis ◽  
C. Glorieux ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Scanning Calorimetry ◽  
Adiabatic Scanning Calorimetry

Phase transitions in lipid vesicles detected by a complementary set of methods: heat-transfer measurements, adiabatic scanning calorimetry, and dissipation-mode quartz crystal microbalance

2014 ◽  
Vol 211 (6) ◽  
pp. 1377-1388 ◽  
Author(s):  
P. Losada-Pérez ◽  
K. L. Jiménez-Monroy ◽  
B. van Grinsven ◽  
J. Leys ◽  
S. D. Janssens ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Phase Transitions ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Lipid Vesicles ◽  
Scanning Calorimetry ◽  
Adiabatic Scanning Calorimetry ◽  
Complementary Set

An Adiabatic Scanning Calorimetry Study of the Nematic-Smectic A and Nematic-Isotropic Phase Transitions in 4-butyloxyphenyl-4'-decyloxybenzoate

2007 ◽  
Vol 477 ◽  
pp. 3-16 ◽  
Author(s):  
K. Denolf ◽  
B. Van Roie ◽  
C. Glorieux ◽  
J. Thoen ◽  
S. Yildiz ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Isotropic Phase ◽  
Scanning Calorimetry ◽  
Adiabatic Scanning Calorimetry ◽  
Smectic A

Phase Transitions in the Starch−Water System Studied by Adiabatic Scanning Calorimetry

2002 ◽  
Vol 50 (6) ◽  
pp. 1335-1344 ◽  
Author(s):  
Alfredo Cruz-Orea ◽  
Guido Pitsi ◽  
Peter Jamée ◽  
Jan Thoen
Keyword(s):  
Phase Transitions ◽  
Water System ◽  
Scanning Calorimetry ◽  
Adiabatic Scanning Calorimetry

scholarly journals Double-Chain Cationic Surfactants: Swelling, Structure, Phase Transitions and Additive Effects

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3946
Author(s):  
Rui A. Gonçalves ◽  
Yeng-Ming Lam ◽  
Björn Lindman
Keyword(s):  
Phase Transitions ◽  
Phase Behaviour ◽  
Double Chain ◽  
Scanning Calorimetry ◽  
Alkyl Chains ◽  
X Ray Scattering ◽  
Amphiphilic Compounds ◽  
Liquid Phases ◽  
Lamellar Phases ◽  
Water Layers

Double-chain amphiphilic compounds, including surfactants and lipids, have broad significance in applications like personal care and biology. A study on the phase structures and their transitions focusing on dioctadecyldimethylammonium chloride (DODAC), used inter alia in hair conditioners, is presented. The phase behaviour is dominated by two bilayer lamellar phases, Lβ and Lα, with “solid” and “melted” alkyl chains, respectively. In particular, the study is focused on the effect of additives of different polarity on the phase transitions and structures. The main techniques used for investigation were differential scanning calorimetry (DSC) and small- and wide-angle X-ray scattering (SAXS and WAXS). From the WAXS reflections, the distance between the alkyl chains in the bilayers was obtained, and from SAXS, the thicknesses of the surfactant and water layers. The Lα phase was found to have a bilayer structure, generally found for most surfactants; a Lβ phase made up of bilayers with considerable chain tilting and interdigitation was also identified. Depending mainly on the polarity of the additives, their effects on the phase stabilities and structure vary. Compounds like urea have no significant effect, while fatty acids and fatty alcohols have significant effects, but which are quite different depending on the nonpolar part. In most cases, Lβ and Lα phases exist over wide composition ranges; certain additives induce transitions to other phases, which include cubic, reversed hexagonal liquid crystals and bicontinuous liquid phases. For a system containing additives, which induce a significant lowering of the Lβ–Lα transition, we identified the possibility of a triggered phase transition via dilution with water.

Differential scanning calorimetry of phase transitions in (CnH2n+1NH3)2MnCl4 compounds

1975 ◽  
Vol 17 (10) ◽  
pp. 1221-1222 ◽  
Author(s):  
E.H. Bocanegra ◽  
M.J. Tello ◽  
M.A. Arriandiaga ◽  
H. Arend
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Transitions ◽  
Scanning Calorimetry
Sign in / Sign up

Export Citation Format

Share Document