二氧化硅空心球的制备及性能研究.docVIP

二氧化硅空心球的制备及性能研究 摘要：本课题采用溶胶-凝胶法，通过正硅酸四乙酯（TEOS）的水解聚合反应制备了形态规则的二氧化硅空心球。考察不同搅拌速度，水、碳酸氢钠、TEOS和AEO9用量以及反应时间对二氧化硅空心球的粒径和粒径分布系数的影响。随后将最优条件下制备的二氧化硅空心球直接应用香料负载，研究其包覆效果。结果表明，当粒径为535.3nm时，该空心球对兔耳草醛的的负载率为30.51%；当粒径为298.7nm时，该空心球对香料的负载率为21.07%；当粒径为872.5nm时，该空心球对香料的的负载率为9.32%。8天后，粒径为535.3nm的空心球香气释放达13.57%，粒径为298.7nm的空心球香气释放达14.44%。关键词： 二氧化硅；空心球；制备；表征9139 Preparation and Properties of Silica Hollow Microspheres Abstract: The ordered hollow silica microspheres have been synthesized though a modified sol-gel method based on the hydrolysis and condensation of tetraethoxysilane (TEOS) in an aqueous system. The morphological development of the product during the reaction was monitored under the different stirring speed, time of hydrolysis, and the concentration of deionized water, sodium bicarbonate, TEOS and AEO9. In order to measure coating ability, the optimal react conditions being selected by transmission electron microscopy (TEM) and dynamic light scattering (DLS) was applied to coating Cyclamen Aldehyde directly. It turned out that the particle with a pore diameter of 535.3nm have a coating rate of 30.51%, particles with a pore diameter of 298.7nm is 21.07%, and the coating rate is only 9.32% when the diameter is 872.5nm. Moreover, eight days later, particles under the diameter of 535.3nm release 13.57% of the fragrance it coated and particles under the diameter of 298.7nm release 14.44%. Key Words: organosilica; microsphere; synthesis; property 目录 1概述1 1.1 二氧化硅空心球的研究现状1 3.2.6 反应时间对二氧化硅空心球粒径的影响17 3.3 二氧化硅空心球的红外光谱18 3.4 二氧化硅空心球的微观形貌19 3.5 二氧化硅空心球香料包覆率测定hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;hellip;.21 3.6 香精缓释性测定结果21 4 结论23 致谢24 参考文献：25 1概述 1.1 二氧化硅空心球的研究现状 1.1.1 纳米与纳米材料 纳米，纳米技术和纳米材料的研究，目前已成为国际科学家的一大研究热点。它将在轻家电、医疗保健、计算机、化工和航天等领域得到广泛的应用。科学家认为，纳米材料的产生是推动2l世纪经济高速增长的ldquo;加速器rdquo;。 纳米(nanometer, nm)，是一个长度单位，lnm=10-3micro;m=10-6mm=10-9m。纳米材料是组成相或晶粒结构控制100nm以下的长度尺寸的材料，是本世纪八十年代诞生的一种新型材料，当前被誉为跨世纪的高科技