Core-shell structure PEO/CS nanofibers based on electric field induced phase separation via electrospinning and its application

Development of cost-effective, high-performance and flexible electrocatalysts for hydrogen production is of scientific and technological importance. Catalysts with core-shell structure for water dissociation have been extensively investigated. However, most of...

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Perfume Encapsulation via Vapor Induced Phase Separation

Processes ◽

10.3390/pr7120865 ◽

2019 ◽

Vol 7 (12) ◽

pp. 865 ◽

Cited By ~ 1

Author(s):

Mario Ammendola ◽

Raul Rodrigo Gomez ◽

Ricard Garcia Valls

Keyword(s):

Phase Separation ◽

Cellulose Acetate ◽

Shell Structure ◽

Encapsulation Efficiency ◽

Empty Space ◽

Core Shell ◽

Active Concentration ◽

Core Shell Structure ◽

Tga Analysis ◽

Exposition Time

In this study we explored the implementation of the vapor induced phase separation (VIPS) to produce cellulose acetate microcapsules for the encapsulation of a complex mix of fragrances. VIPS is a technique used for membrane preparation, but barely mentioned for microencapsulation. We compared the products from VIPS and a more common microencapsulation process, the immersion precipitation technique (IPS). The capsules prepared via VIPS show a core-shell structure with a thin polymeric shell surrounding the internally empty space, conversely to those produced via IPS, showing an incomplete spherical morphology. This can be attributed to a better control of the precipitation rate of the encapsulation material in the non-solvent thanks to the longer exposition time to the vapor. The activity and encapsulation efficiency of the capsules, obtained through TGA analysis, reached a maximum of ≈75% and ≈90%, respectively. Moreover, a growing trend between the initial active concentration and the encapsulation efficiency is noticed.

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Effect of Melt Overheating Treatment on the Melt Structure and Solidified Structures of Al75Bi9Sn16 Immiscible Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.223 ◽

2017 ◽

Vol 898 ◽

pp. 223-230

Author(s):

Peng Jia ◽

Yang Liu ◽

Jin Yang Zhang ◽

Yu Yao Ma ◽

Chen Wu ◽

...

Keyword(s):

Phase Separation ◽

Liquid Phase ◽

Shell Structure ◽

Solidification Rate ◽

Liquid Phase Separation ◽

Core Shell ◽

The Core ◽

Immiscible Alloy ◽

Core Shell Structure ◽

The Impact

In this paper, the liquid phase separation and solidification process of the Al75Bi9Sn16 immiscible alloy were studied with calorimetric and resistivity methods to make the melt superheated treatment process. The impact of melt overheating treatment (MOT) on the phase constitution and solidification microstructures were investigated using X-Ray diffraction (XRD) and field emission scanning electron microscope (FESEM) to determine the structural sensitivity to the melt superheated degree, and find a new strategy for improving the forming ability of the core-shell structure of the Al75Bi9Sn16 alloy. The results show that: the liquid phase separation and precipitation of primary (Sn) phase occur in 1039K-880K and 460K-403K; the core-shell structure with Sn-Bi-rich core and Al-rich shell can be formed under conventional casting conditions; the melt overheating treatment (MOT) can promote the formation of core-shell structure by increasing solidification time t0 and decreasing the average solidification rate v.

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