Thermodynamics of micellisation and gelation of oxyethylene/oxypropylene diblock copolymers in aqueous solution studied by light scattering and differential scanning calorimetry

1992 ◽  
Vol 88 (10) ◽  
pp. 1441 ◽  
Author(s):  
Yulin Deng ◽  
Ga-Er Yu ◽  
Colin Price ◽  
Colin Booth
Keyword(s):  
Aqueous Solution ◽  
Differential Scanning Calorimetry ◽  
Light Scattering ◽  
Diblock Copolymers ◽  
Scanning Calorimetry

scholarly journals Thermal behaviour study of solid state compounds of manganese (II), zinc (II) and lead (II) with cinnamic acid

1998 ◽  
Vol 23 (0) ◽  
pp. 09-16
Author(s):  
Marco Aurélio da Silva CARVALHO FILHO ◽  
Massao IONASHIRO
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
Differential Scanning Calorimetry ◽  
Cinnamic Acid ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Manganese Zinc ◽  
Behaviour Study ◽  
Derivative Thermogravimetry

Compounds of cinnamic acid with manganese, zinc and lead have been prepared in aqueous solution. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC), X-ray diffraction and complexometry have been used in the characterization as well as in the study of the thermal stability and interpretation concerning the thermal decomposition.

Photophysical properties of microencapsulated phthalocyanines

2010 ◽  
Vol 14 (03) ◽  
pp. 278-283 ◽  
Author(s):  
Virginia E. Diz ◽  
Gabriela A. Gauna ◽  
Cristian A. Strassert ◽  
Josefina Awruch ◽  
Lelia E. Dicelio
Keyword(s):  
Differential Scanning Calorimetry ◽  
Light Scattering ◽  
Quantum Yield ◽  
Fluorescence Quantum Yield ◽  
Photophysical Properties ◽  
Oxygen Production ◽  
Electronic Microscopy ◽  
Scanning Calorimetry ◽  
Singlet Molecular Oxygen ◽  
Photophysical Parameters

Lipophilic substituted zinc(II) phthalocyanines: 2,3,9,10,16,17,23,24-octakis[(N,N-dimethylaminoethylsulfanyl)]phthalocyaninatozinc(II) (S1) and tetrakis(N,N-dibutylaminoethoxy)phthalocyaninatozinc(II) (3) were incorporated into soybean L-α-phosphatidylcholine (SPC) liposomes of 100 nm diameter. Liposomes were characterized by static light scattering (SLS), transmission electronic microscopy (TEM), and differential scanning calorimetry. The fluorescence quantum yield and singlet molecular oxygen production of 3 are Φ F = 0.15 and ΦΔ = 0.24, respectively, whereas the same photophysical parameters for S1 are Φ F = 0.13 and ΦΔ = 0.51. Higher values of Φ F and ΦΔ are obtained in organic solvent for both dyes. Synthesis of compound 3 has also been reported.

Phase transitions of liposomes: When light meets heat

2021 ◽  
Author(s):  
C S Velez-Saboyá ◽  
J R Guzmán-Sepúlveda ◽  
Jesus Carlos Ruiz-Suárez
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Transitions ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Membrane Thickness ◽  
Scanning Calorimetry ◽  
Contraction Process ◽  
Exothermic Process ◽  
Gel Phase ◽  
Derivatives Of

Abstract Phase transitions of liposomes are normally studied by differential scanning calorimetry (DSC). A suspension of liposomes is subjected to an increase (decrease) of temperature and when heat is absorbed (released), the liposomes transit from a gel (liquid) to a liquid (gel) phase. This endothermic (exothermic) process takes place at a temperature called the melting temperature Tm, which is distinctive of the type of lipids forming the vesicles. The vesicles, though, also modify their size in the transition. Indeed, the thickness of the membranes decreases (increases) because carbon tails misalign (align). Concomitant with the modifications in the membrane thickness, the diameter (D) of the liposomes changes too. Therefore, when they are inspected by light, the scattered signal carries information from such dilatation (contraction) process. We performed careful experiments using dynamic light scattering (DLS) as a function of temperature to detect the size changes of different liposomes. Gaussian fits of the derivatives of the D vs T curves coincide within 1% with thermograms, which hints to the possibility of performing thermodynamic studies of lipid systems employing light.

Interaction of Human-Like Collagen with Copper (II): Effect on Thermal Characteristics

2013 ◽  
Vol 721 ◽  
pp. 625-628
Author(s):  
Yuan Yan Yu
Keyword(s):  
Aqueous Solution ◽  
Differential Scanning Calorimetry ◽  
Copper Complex ◽  
Thermal Characteristics ◽  
Solution Technique ◽  
Dsc Analysis ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Pure Protein

This work describes the aqueous-solution technique preparation and characterization of the complex between human-like collagen and copper (II). Pure human-like collagen and the copper complex were characterized by thermo gravimetric (TG) and differential scanning calorimetry (DSC) analysis. The TG curves and DSC data reveal the significant thermal differences between pure protein and the copper complex, demonstrating the formation of a new chemical compound, which is different from the free HLC and with more stable thermodynamic properties.

Thermal Hysteresis in Ganglioside Micelles Investigated by Differential Scanning Calorimetry and Light-Scattering

Langmuir ◽  
1999 ◽  
Vol 15 (15) ◽  
pp. 4975-4980 ◽  
Author(s):  
Laura Cantú ◽  
Mario Corti ◽  
Elena Del Favero ◽  
Elke Muller ◽  
Antonio Raudino ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Light Scattering ◽  
Thermal Hysteresis ◽  
Scanning Calorimetry
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