以染料亚甲基蓝(MB)水溶液为内水相、大豆油为油相,采用两步乳化法制备出稳定的W/O/W型Pickering乳液;以海藻酸钙为壁材、包裹亚甲基蓝水溶液的W/O/W型Pickering乳液为芯材,采用化学交联固化法制备微胶囊。通过显微镜观察Pickering乳液液滴粒径及稳定性,利用紫外分光光度计考察了单因素对微胶囊缓释性能的影响。结果表明,当固体颗粒质量分数为2.5%时制备的W/O/W型Pickering乳液最为稳定,平均粒径为39.22 μm;直径为1 000 μm的微胶囊置于酸中缓释率最大,可达到89.1%。

A stable W/O/W Pickering emulsion is prepared through a two-step emulsification method using methylene blue (MB) aqueous solution as the internal water phase and soybean oil as the oil phase.Microcapsules are prepared via chemical crosslinking curing method by using calcium alginate as wall material and the prepared W/O/W Pickering emulsion coated with methylene blue aqueous solution as core material.The particle size and stability of Pickering emulsion droplets are observed by means of microscope,and the influences of single factor on the slow-release performance of microcapsules is investigated by means of UV spectrophotometer.The results show that the most stable W/O/W type Pickering emulsion can be obtained with an average particle size of 39.22 μm when the amount of solid particles is 2.5%.Microcapsules with a diameter of 1 000 μm has the highest slow-release rate in acid,reaching 89.1%.

宁娇(1996-),女,硕士研究生,研究方向为乳液应用研究,1379400344@qq.com