Aqueous Phase Behavior and Dispersed Nanoparticles of Diglycerol Monooleate/Glycerol Dioleate Mixtures

Abstract

The first part of this study concerns the aqueous phase behavior of mixtures of diglycerol monooleate (DGMO) and glycerol dioleate (GDO) examined by X-ray diffraction (XRD). The ternary phase diagram displays a multitude of liquid crystalline phases (polymorphism). With increasing GDO content the following phase sequence was observed: lamellar (L(alpha)); two reversed bicontinuous cubic phases (Q(230) and Q(224)); reversed hexagonal (H(II)); the reversed micellar (L(2)) phase. The second part deals with the preparation and characterization of aqueous dispersions of the reversed hexagonal phase in the presence of the nonionic triblock copolymer Pluronic F127. Submicrometer-sized monocrystalline H(II) phase particles were obtained, as evidenced by cryo-transmission electron microscopy (cryo-TEM), laser diffraction, and XRD, by use of a simple and reproducible preparation method including a heat-treatment step. Moreover, the particle size distributions of the H(II) phase nanoparticle dispersions were narrow as determined by laser diffraction measurements. Using XRD, we show that the polymeric stabilizer is depleted from the core of the hexagonal particles and preferentially located at the surface. It is concluded that the preferential distribution of stabilizing agents at particle surfaces is a prerequisite for the formation of structurally well-defined and kinetically stable H(II) phase particles (Hexosome).

Reverse Micelle Microstructural Transformations Induced by Surfactant Molecular Structure, Concentration, and Temperature

“…These surfactants offer a various self-assembled structures in water or in surfactant/water/oil systems. [42][43][44][45] However, the self-assembled structures in surfactant/oil systems have not well studied.…”

Spontaneous Formation of Vesicles and Dispersed Cubic and Hexagonal Particles in Amino Acid-Based Catanionic Surfactant Systems

“…[31][32][33][34]54 According to these references, the particles consist of a bundle of cylinders bent by 180°, as can be seen in the Figure. These particles formed spontaneously, and no stabilizer was added to disperse them in solution.…”

“…18 They are even more interesting in our case because they form without adding any stabilizer, which otherwise is a common feature of these systems. 28,30,[32][33][34]53,66 …”

“…31,53,54 The particles shown in Figure 10d also have hexagonal symmetry as previously demonstrated in the literature. [31][32][33][34]54 Regarding the particle sizes, they range from 400 to 600 nm for cubic particles and from 100 to 200 nm for hexagonal particles.…”

The properties of an UV curable support material pre-polymer for three dimensional printing

“…Thus, 4-Methoxy phenol of 0.15wt% would inhibit effectively thermal gels formation, and the curing time was acceptable. Table 2 4 T h e e f f e c t o f S R 3 4 4 o n t h e m e c h a n i c a l p r o p e r t i e s o f s u p p o r t m a t e r i a l As we know, F127 aqueous solutions can form gel at a special temperature or concentration [10,11] , but the mechanical properties of pure gel are very weak. Thus, it is necessary that SR344 is added to the composition to increase the strength of the support material upon curing.…”