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发表时间：2012-01-01

发表刊物：功能材料

所属单位：化工学院

期号：18

页面范围：2505-2508

ISSN号：1001-9731

摘要：Supercritical fluid impinging technology（SFIT） was proposed as a novel microparticle coating process,which combines supercritical fluid technique with impinging steam technique.The process was investigated using ultrafine glass beads as the core particle and paraffin as the coating material.The effects of the operation parameters,such as pressure,temperature,impinging distance and pre-expansion temperature were investigated.As the result,the optimal operation condition was： pressure of 20MPa,temperature of 75℃,impinging distance of 70mm,and pre-expansion temperature of 140℃.A number of techniques were used for the characterization of the microcapsules.A scanning electron microscope（SEM） was used to observe the morpho-logy of the particle surface.The microcapsule size distribution is measured by laser particle size analyzer（LPSA）,and differential scanning calorimeter（DSC） measurements were conducted to determine the apparent coating rates of microcapsules.As a result,the advantages of SFIT enhance the mass transfer and heat transfer,which prevent particles agglomeration and coating of microparticle by SFIT is demonstrated to have enormous potential.

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