Partition Coefficients of 1-Alkanols between Water and DDAB Vesicle Membrane Determined by Differential Conductivity Method

Kawamura, Hideo; Manabe, Masahiro; Myoujou, Masako; Katsuura, Hajime; Shiomi, Masaki

doi:10.5650/jos.58.177

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…Unlike CVC (see Table S1 and S2 and Refs. [16][17][18][19][20][21]), T m (Table S3) is well-defined for DDAB in water (T m ≈ 16 • C) and highly cooperative (peak width T 1/2 < 0.5 • C) [2,5,13]. To the best of our knowledge the reverse liquid crystalline-to-gel transition temperature (T m ), has not been reported for DDAB so far because of its exceedingly slow kinetics [3,13].…”

Section: Thermal Behavior Of Ddab In Watermentioning

confidence: 95%

Thermal and phase behavior of didodecyldimethylammonium bromide aqueous dispersions

Feitosa

Adati

Alves

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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h i g h l i g h t s• On increasing DDAB concentration, the following phase sequence appears: monomer, vesicle, lamellae.• DDAB unilamellar vesicles are formed in water only in a very narrow concentration range.• DDAB multilamellar vesicles co-exist with unilamellar vesicles in this concentration range.• Phase separation occurs in DDAB/water, with lamellae on top and vesicles on bottom.• The reverse melting temperature of DDAB/water is around 9.5 • C. g r a p h i c a l a b s t r a c t a b s t r a c t This work aims to delineate the single isotropic vesicle phase (Ves) in the binary didodecyldimethylammonium bromide (DDAB)/water system, limited by the critical vesicle concentrations, CVC 1 ≈ 0.05 mM (2.3 × 10 −3 wt%) and CVC 2 ≈ 0.7 mM (3.1 × 10 −2 wt%), as the onset of unilamellar vesicle formation and of two-phase separation into Ves + Lam (lamellar) phases, respectively. Isothermal titration calorimetry (ITC), turbidity, and crossed polaroids observations indicate that below CVC 1 the dispersion is dominated by free monomers or micelles, but rich in uni-and multilamellar vesicles between CVC 1 and CVC 2 , with CVC 2 = 0.21 mM (9.5 × 10 −3 wt%) being the onset of multilamellar vesicle formation. Above CVC 2 , the volume of the Lam phase increases, while the volume for the Ves phase decreases to vanish around CVC 3 ≈ 21 mM (0.95 wt%). Differential scanning calorimetry (DSC) data show that the gel-to-liquid crystalline transition at T m ≈ 16 • C is highly cooperative ( T 1/2 ≈ 0.3 • C), and the melting enthalpy ( H m ) increases with DDAB concentration. Because of the remarkably slow liquid crystalline-to-gel kinetics, a cooling transition around T m ≈ 9.5 • C is reported here for the first time, we ascribe to the liquid crystalline-to-gel transition (thermal hysteresis T m ≈ 6.5 • C). Vesicle and lamellar structure formation E. Feitosa et al. / Colloids and Surfaces A: Physicochem. Eng. Aspects 480 (2015) 253-259 is supported also by hydrodynamic diameter (D H ) data, being 100-140 and 800-1200 nm, respectively, at 25 • C. The zeta potential ( ) increases with DDAB concentration but does not change much with temperature, indicating no pronounced structural change when temperature varies around T m .

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Section: Thermal Behavior Of Ddab In Watermentioning

confidence: 95%

Thermal and phase behavior of didodecyldimethylammonium bromide aqueous dispersions

Feitosa

Adati

Alves

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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show abstract

“…We have applied this technique to didodecyldimethylammonium bromide DDAB vesicles/1-alkanols system, and evaluated the two quantities, i.e., K x and dα / dX a m 7 . By comparing the results of DDAB vesicles/1-alkanols system with those of SDS micelles/1-alkanols one, it was suggested that both of surfactant molecules and 1-alkanol molecules are packed more closely in DDAB vesicle membranes than in SDS micelles 7 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydroxyl Groups on Solubilization States of Alkandiols in DTAB Micelles: Application of a Differential Conductivity Technique

Kawamura¹,

Takeda²,

Tagawa³

et al. 2017

J. Oleo Sci.

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Partition Coefficients of 1-Alkanols between Water and DDAB Vesicle Membrane Determined by Differential Conductivity Method

Cited by 2 publications

References 21 publications

Thermal and phase behavior of didodecyldimethylammonium bromide aqueous dispersions

Thermal and phase behavior of didodecyldimethylammonium bromide aqueous dispersions

Effect of Hydroxyl Groups on Solubilization States of Alkandiols in DTAB Micelles: Application of a Differential Conductivity Technique

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