Rheological behavior in the didodecyldimethylammonium bromide/water system

Soltero, J. F. A.; Bautista, F.; Pecina, E.T.; Puig, J. E.; Manero, Ο.; Proverbio, Z. E.; Schulz, Pablo C.

doi:10.1007/s003960050006

Cited by 53 publications

(52 citation statements)

References 2 publications

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“…It means that DMAB forms aggregate at the very low concentration and solubilizes organic polymer solution more than PVA. 17,18 This makes DMAB more efficient in lowering the interfacial tension, resulting in smaller particles as compared to PVA (Tabs. 2 and 3).…”

Section: Results and Discussion Preparation And Characterization Of Nmentioning

confidence: 99%

PLGA Nanoparticles for Oral Delivery of Hydrophobic Drugs: Influence of Organic Solvent on Nanoparticle Formation and Release Behavior In Vitro and In Vivo Using Estradiol as a Model Drug

Sahana

Mittal

Bhardwaj

et al. 2008

Journal of Pharmaceutical Sciences

226

120

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Section: Results and Discussion Preparation And Characterization Of Nmentioning

confidence: 99%

PLGA Nanoparticles for Oral Delivery of Hydrophobic Drugs: Influence of Organic Solvent on Nanoparticle Formation and Release Behavior In Vitro and In Vivo Using Estradiol as a Model Drug

Sahana

Mittal

Bhardwaj

et al. 2008

Journal of Pharmaceutical Sciences

226

120

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“…Fig. 3 shows the β values as a function of DDAB concentration at 25 • C. In DDAB solutions slightly above the cmc, it has been reported that the values of β for the micelles were 0.26 and 0.13 by a bromide ion selective electrode and a conductivity measurement, respectively [3,27]. In general, β values of ionic micelles have been shown to be rather insensitive to surfactant concentrations [28].…”

Section: Dependence Of the Degree Of Counterion Binding On The Ddab Cmentioning

confidence: 94%

Effects of micelle-to-vesicle transitions on the degree of counterion binding

Ono

Kawasaki

Annaka

et al. 2005

Journal of Colloid and Interface Science

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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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Rheological behavior in the didodecyldimethylammonium bromide/water system

Cited by 53 publications

References 2 publications

PLGA Nanoparticles for Oral Delivery of Hydrophobic Drugs: Influence of Organic Solvent on Nanoparticle Formation and Release Behavior In Vitro and In Vivo Using Estradiol as a Model Drug

PLGA Nanoparticles for Oral Delivery of Hydrophobic Drugs: Influence of Organic Solvent on Nanoparticle Formation and Release Behavior In Vitro and In Vivo Using Estradiol as a Model Drug

Effects of micelle-to-vesicle transitions on the degree of counterion binding

Thermal and phase behavior of didodecyldimethylammonium bromide aqueous dispersions

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