Journal
SOFT MATTER
Volume 7, Issue 12, Pages 5685-5690Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1sm05246b
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Funding
- DFG [SPP1296 SCHO1054/3-2, SFBTR6 D1, PA495/16]
- DAAD-IASTE
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We have studied the nucleation kinetics in the bulk as well as at the container walls of a charged sphere colloidal model system under salt-free conditions close to the fluid-crystal phase boundary. We determined time resolved nucleation rate densities for heterogeneous nucleation on the wall, the corresponding nucleation rate densities for homogeneous nucleation and compare the resulting nucleation barrier heights. The homogeneous barrier height decreases exponentially with increasing metastability, while the heterogeneous barrier displays a sharp transition from a constant value close to the phase boundary to zero at higher metastability. As a consequence the microstructure evolution is dominated by a competition between the wall crystal growth and homogeneous nucleation.
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