Distribution of Macropores in Silica Particles Prepared by Using Multiple Emulsions

Oh, Chul; Chung, Su-Chul; Shin, Seoyong; Kim, Young Chai; Im, Seung‐Soon; Oh, Seong‐Geun

doi:10.1006/jcis.2002.8559

Cited by 31 publications

(10 citation statements)

References 17 publications

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“…Multiple emulsions may find many potential applications in various fields such as chemistry [2], pharmaceutics [3], cosmetics [4], and food [5]. These emulsions have been investigated as controlled-release drug delivery systems (DDS) [3], as 'emulsion liquid membranes' for simultaneous liquid extraction and stripping of metals [6], organic acids [7] and antibiotics [8], as microcapsules for the protection and controlled release of functional food ingredients [9], for the formulation of reduced-calorie food emulsions [10], etc.…”

Section: Introductionmentioning

confidence: 99%

Production of multiple emulsions for drug delivery systems by repeated SPG membrane homogenization: Influence of mean pore size, interfacial tension and continuous phase viscosity

Vladisavljević

Shimizu²,

Nakashima³

2006

Journal of Membrane Science

115

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Section: Introductionmentioning

confidence: 99%

Production of multiple emulsions for drug delivery systems by repeated SPG membrane homogenization: Influence of mean pore size, interfacial tension and continuous phase viscosity

Vladisavljević

Shimizu²,

Nakashima³

2006

Journal of Membrane Science

115

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“…[19] Under the same conditions, 1.4 wt.% of HPC with respect to oil phase was dissolved in this system. Because the solution was difficult to handle above 1.4 wt.%, this concentration was the maximum amount used in the oil phase.…”

Section: Preparation Of O/w/o Multiple Emulsion Using Two Surfactantsmentioning

confidence: 99%

O/W/O Multiple Emulsions via One‐Step Emulsification Process

Park

Shin

et al. 2004

Journal of Dispersion Science and Technology

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The preparation of O/W/O multiple emulsions by a one-step emulsification process was studied using an optical microscope equipped with a camera. The O/W/O multiple emulsions could be prepared by the introduction of two surfactants and two polymers. But when one of two polymers or water-soluble surfactant was not added, W/O emulsions with various size distributions were formed. Tween 20 added in water destabilizes W/O interfacial films formed by Span 80. At a result, the diffusion of 1-octanol into water droplets occurred more easily. Using a polymer in the continuous phase, the swelling of W/O interfaces was retarded but the use of two polymers in the continuous and discontinuous phases assisted the micelles mixed with oil molecules to diffuse into the core of aqueous droplets and remain. Moreover, the interaction between Tween 20 and PEG promoted coalescence of oil-swollen micelles in the water droplets. Depending upon the choice of water-soluble nonionic surfactants and polymers, three types of emulsion droplets were observed. Variation in the shapes of the droplets was due to differences in solubilization power of the surfactants. Also, the O/W/O multiple emulsions were stable for 8 h but most of the emulsions were at least partially broken after 24 h.

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“…The authors explain that the monolithic body with well-defined interconnected macropores is a result of concurrent phase separation and sol-gel transition induced by the polymerization reaction, whereas the mesopores are templated by the cooperative self-assembly of inorganic species and the assembly directing agent polyethylene oxide-block-poly-polypropylene oxide-blockpolyethylene oxide. A versatile method widely used to get the macro-mesoporous materials consists in combining the emulsion templating method and the surfactant assembly templating one [25][26][27][28][29][30]. In that case the main role of oil is to act as a template for the generation of the macropore network.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical mesoporous silica templated by the combination of fine emulsion and micelles

Cervantes-Martinez

Stébé

Emo

et al. 2020

Microporous and Mesoporous Materials

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Concentrated emulsions have been widely considered as templates for the preparation of macroporous structures. Replacing concentrated emulsions by fine ones should rather lead to materials having large mesopores. However, fine emulsions were barely investigated for this purpose. On the other hand, mesostructured silica SBA-15 can be prepared from Pluronic P123 micelles according to the cooperative templating mechanism. Starting from mixture of fine emulsion and Pluronic P123 micelles, it is expected to obtain silicas with a controlled hierarchical mesoporosity. The fine emulsion has been formulated from the Kolliphor/Myristate/Water system. To get informations concerning the degree of compatibility between the two surfactants, which can affect the formation of the porous materials, the Kolliphor/P123/water system has been investigated in detail. The structural parameters of the mixed liquid crystal phases have been determined and the mixed micellar structure has been investigated by SAXS. The hierarchical porous silicas have been synthetized combining fine emulsion and Pluronic micellar solution. The materials porosity features strongly depend on the weight proportion between the fine emulsion and the P123 micelles. If this proportion is lower than 5/5, mesoporous silicas present a dual mesoporosity. By contrast, by increasing this proportion the mesopore size distribution only shows large mesopores.

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Distribution of Macropores in Silica Particles Prepared by Using Multiple Emulsions

Cited by 31 publications

References 17 publications

Production of multiple emulsions for drug delivery systems by repeated SPG membrane homogenization: Influence of mean pore size, interfacial tension and continuous phase viscosity

Production of multiple emulsions for drug delivery systems by repeated SPG membrane homogenization: Influence of mean pore size, interfacial tension and continuous phase viscosity

O/W/O Multiple Emulsions via One‐Step Emulsification Process

Hierarchical mesoporous silica templated by the combination of fine emulsion and micelles

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