Thermal transitions of DODAB vesicular dispersions

J Cocquyt; Ulf Olsson; Gerd Olofsson; P Van der Meeren

doi:10.1007/s00396-005-1347-9

Thermal transitions of DODAB vesicular dispersions

J Cocquyt, Ulf Olsson, Gerd Olofsson, P Van der Meeren

Physical Chemistry

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Abstract

Two endothermic transitions, at 36 degrees C and 44 degrees C, were observed with differential scanning calorimetry (DSC) upon heating dioctadecyldimethylammonium bromide vesicle dispersions that were equilibrated below 15 degrees C while in samples kept at 25 degrees C there was only the transition at 44 degrees C, which was shown to be the gel to liquid-crystalline transition by H-1-NMR measurements. The transition at 36 degrees C was reversed in an exothermic transition around 13 degrees C upon cooling. The slowness of this transition at ambient temperatures suggests that the presence of the transition at 36 degrees C in a DSC upscan depends strongly on the sample history.

Original language	English
Pages (from-to)	1376-1381
Journal	Colloid and Polymer Science
Volume	283
Issue number	12
DOIs	https://doi.org/10.1007/s00396-005-1347-9
Publication status	Published - 2005

Subject classification (UKÄ)

Physical Chemistry

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10.1007/s00396-005-1347-9

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title = "Thermal transitions of DODAB vesicular dispersions",

abstract = "Two endothermic transitions, at 36 degrees C and 44 degrees C, were observed with differential scanning calorimetry (DSC) upon heating dioctadecyldimethylammonium bromide vesicle dispersions that were equilibrated below 15 degrees C while in samples kept at 25 degrees C there was only the transition at 44 degrees C, which was shown to be the gel to liquid-crystalline transition by H-1-NMR measurements. The transition at 36 degrees C was reversed in an exothermic transition around 13 degrees C upon cooling. The slowness of this transition at ambient temperatures suggests that the presence of the transition at 36 degrees C in a DSC upscan depends strongly on the sample history.",

author = "J Cocquyt and Ulf Olsson and Gerd Olofsson and {Van der Meeren}, P",

year = "2005",

doi = "10.1007/s00396-005-1347-9",

language = "English",

volume = "283",

pages = "1376--1381",

journal = "Colloid and Polymer Science",

issn = "0303-402X",

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T1 - Thermal transitions of DODAB vesicular dispersions

AU - Cocquyt, J

AU - Olsson, Ulf

AU - Olofsson, Gerd

AU - Van der Meeren, P

PY - 2005

Y1 - 2005

N2 - Two endothermic transitions, at 36 degrees C and 44 degrees C, were observed with differential scanning calorimetry (DSC) upon heating dioctadecyldimethylammonium bromide vesicle dispersions that were equilibrated below 15 degrees C while in samples kept at 25 degrees C there was only the transition at 44 degrees C, which was shown to be the gel to liquid-crystalline transition by H-1-NMR measurements. The transition at 36 degrees C was reversed in an exothermic transition around 13 degrees C upon cooling. The slowness of this transition at ambient temperatures suggests that the presence of the transition at 36 degrees C in a DSC upscan depends strongly on the sample history.

AB - Two endothermic transitions, at 36 degrees C and 44 degrees C, were observed with differential scanning calorimetry (DSC) upon heating dioctadecyldimethylammonium bromide vesicle dispersions that were equilibrated below 15 degrees C while in samples kept at 25 degrees C there was only the transition at 44 degrees C, which was shown to be the gel to liquid-crystalline transition by H-1-NMR measurements. The transition at 36 degrees C was reversed in an exothermic transition around 13 degrees C upon cooling. The slowness of this transition at ambient temperatures suggests that the presence of the transition at 36 degrees C in a DSC upscan depends strongly on the sample history.

U2 - 10.1007/s00396-005-1347-9

DO - 10.1007/s00396-005-1347-9

M3 - Article

SN - 0303-402X

VL - 283

SP - 1376

EP - 1381

JO - Colloid and Polymer Science

JF - Colloid and Polymer Science

IS - 12

ER -

Thermal transitions of DODAB vesicular dispersions

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