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Citation: Lu Wen-Qing, Jin An-Ding, Zhu Xiao-Lei, Zhou Zhi-Hua, Huang Jin-Fan. Kinetics of Crystal Nucleation in 2,2,3-trimethylbutane C₇H₁₆[J]. Acta Physico-Chimica Sinica, ;1997, 13(12): 1101-1107. doi: 10.3866/PKU.WHXB19971209 shu

Kinetics of Crystal Nucleation in 2,2,3-trimethylbutane C₇H₁₆

1.
Department of Chemistry,Nanjing Normal University,Nanjing 210097

Received Date: 24 September 1996
Available Online: 15 December 1997

High temperature solid phase I of 2,2,3-trimethylbutane(C7H16)(TMB) was investigated by X-ray powder diffraction. The electron diffraction technique for observing the kinetics of phase transitions in the condensed matter has been applied to study the freezing of TMB clusters with diameter of~13nm. Cluster beams were generated from the supersonically expanded TMB vapor with mole fraction of 0.01 in neon carrier gas. The freezing evolution was monitored by electron diffraction in interval of 7-9 μs. Clusters with an average size of ~5,500 molecules were observed to freeze into the solid phase I at a nucleation rate of 3.5 × 1028 m-3•s- 1 at the freezing temperature of clusters, ～170K. The estimated growth rate of postcritical nuclei indicates that the observed nucleation in the present experiment corresponds to mononuclear freezing of the clusters into single crystals of solid phase I.
- Supersonic jet expansion,
- Nucleation rates,
- Phase size of TMB clusters,
- Interface free energy
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Kinetics of Crystal Nucleation in 2,2,3-trimethylbutane C7H16

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Kinetics of Crystal Nucleation in 2,2,3-trimethylbutane C₇H₁₆