Controllable preparation of monodisperse alginate microcapsules with oil cores
| Autor: | Guoqing Xiao, Chuanlin Mou, Deng Hongbo, Jia-Xin Hu, Yingqing Zhan, Qi-Zheng Deng, Wang Linyuan |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Alginates Polymers Surface Properties Microfluidics Dispersity Capsules 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Thymus Plant Biomaterials Chitosan Calcium Chloride Acetic acid chemistry.chemical_compound Colloid and Surface Chemistry law Oils Volatile Plant Oils Particle Size Essential oil Aqueous two-phase system Water Hydrogels Equipment Design Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Polyetherimide 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Cross-Linking Reagents Lavandula chemistry Chemical engineering Emulsion Emulsions 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 569:307-319 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2020.02.095 |
| Popis: | Here we report a novel strategy for controllable preparation monodisperse alginate microcapsules with oil cores, where the thickness of the alginate shells, as well as the number and diversity of the oil cores can be tailored precisely. Monodisperse oil-in-water-in-oil (O/W/O) emulsions are generated in a microfluidic device as templates, which contain alginate molecules and a water-soluble calcium complex in the middle aqueous phase. Alginate microcapsules are produced by gelling O/W/O emulsions in oil solution with acetic acid, where the pH decreasing will trigger the calcium ions being released from calcium complex and cross-linking with alginate molecules. Increasing the alginate molecule concentration in emulsion templates affects little on the thickness of the microcapsules but improves their stability in DI water. The strength of alginate microcapsules can be reinforced by post cross-linking in calcium chloride, polyetherimide, or chitosan solution. Typical payloads, such as thyme essential oil, lavender essential oil and W/O emulsions are encapsulated in alginate microcapsules successfully. Furthermore, tailoring the thickness of the alginate shells, as well as the number and the diversity of the oil cores precisely by manipulation the emulsion templates with microfluidics is also demonstrated. The proposed method shows excellent controllability in designing alginate microcapsules with oil cores. |
| Databáze: | OpenAIRE |
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