Fractal Aggregation of Nonequilibrium Iodine

Jizhong ZHANG Xiaojun YANG Hengde LI Dept.of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

摘 要：<正> A large number of particles evaporated from liquid iodine deposited on the wall of a glass container.The deposits demonstrate three structural shapes:globule chain,network formation,and dendrite.The globule chain displays clearly self-similar feature,and can be characterized by fractal geometry.The fractal dimension of the globule chain patterns ranges from D=1.50 to 1.75.The in situ sublimat-ing process of an iodine fractal aggregate was observed.It revealed reversal of the random growthprocess under nonequilibrium condition.The analytical results show that thenucleation-aggregation （NA） model can explain the growth process of iodine fractal aggregate.

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