摘要
以凹凸棒石黏土基气凝胶为精油载体制备高载量香氛剂并实现精油长效控释。以凹凸棒石为三维网络骨架、以植物纤维为增韧补强材料,制备了一种高比表面积、高孔隙率和优良机械加工性能的的凹凸棒石/植物纤维复合气凝胶。该气凝胶对甜橙精油的负载率高达96%且挥发残油率低(<5%)。疏水改性提高了气凝胶对精油的负载率并显著延长精油缓释时间。精油挥发均呈现短暂快速下降、稳定释放、缓慢下降3段变化规律,展示复合气凝胶对精油挥发的良好控速能力:体积为4 cm^(3)的香氛剂在60℃实验温度下可维持80 mg/h恒速释放27 h,累计释放时间为31 h;精油控释速率随气凝胶体积增大而增大,在1 cm^(3)后逐渐趋近平台值;精油在气凝胶中的释放行为符合Korsmeyer-Peppas模型,属于Non-Fickian扩散。
In this work, the palygorskite-based aerogel was used as the carrier of essential oil to prepare high-loading fragrances and achieve long-term controlled release of essential oil. Palygorskite/wood fiber composite aerogels with a high specific surface area, a high porosity and a superior machinability were prepared with palygorskite as a three-dimensional network skeleton and wood fiber as a toughening/reinforcing material. The loading efficiency of sweet orange essential oil on the aerogels is 96% and the volatile residual oil rate is <5%. The hydrophobic modification can increase the loading efficiency of aerogels on essential oil, thus prolonging the release time of essential oil. The volatilization rate of essential oil follows a three-stage change law of short-term rapid decline,stable rate and slow decline, showing a good speed control ability of composite aerogels on the volatilization of essential oil. The fragrance agent can maintain a constant release rate of 80 mg/h for 27 h at 60 ℃, and the cumulative release time is 31 h when the aerogels volume is 4 cm^(3). The controlled release rate of essential oil increases with the increase of aerogels volume. The release behavior of essential oil in aerogels follows the Korsmyer-Peppa model, which belongs to the Non-Fickian diffusion.
作者
李晓
孙伟杰
周鑫宇
朱永
李东
熊清平
陈静
LI Xiao;SUN Weijie;ZHOU Xinyu;ZHU Yong;LI Dong;XIONG Qingping;CHEN Jing(School of Chemical Engineering,Huaiyin Institute of Technology,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province,Huai'an 223003,Jiangsu,China;National&Local Joint Engineering Research Center for Mineral Salt Deep Utilization,Huaiyin Institute of Technology,Huai'an 223003,Jiangsu,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2023年第1期187-193,共7页
Journal of The Chinese Ceramic Society
基金
江苏省自然科学基金面上项目(BK2020022624)
江苏省高等学校自然科学研究重大项目(20KJA360006)。
关键词
凹凸棒石
气凝胶
植物精油
缓释
palygorskite
aerogel
plant essential oil
sustained release
