Abstract
A real-space study is presented on the occurrence of stacking faults in crystals of silica colloids with diameters of about 1 and 1.4 μm formed through sedimentation. The softness of the interaction potential is varied from slightly repulsive to hard-sphere like, both intrinsically by variation of the diameter, as well as through the addition of salt, which screens the surface charges. Our results indicate that the equilibrium crystal structure for these colloids is an fcc-crystal, with the number of stacking faults determined by the interplay between sedimentation and crystallization kinetics, irrespective of the softness of the interaction potential. For spheres with a certain diameter the number of stacking faults decreases with decreasing initial volume fractions. These results provide a way to grow fcc-crystals of hard-sphere particles by slow sedimentation. The relative number of stacking faults in the first few layers above the bottom wall can be as much as a factor of 10 higher than deeper into the crystal. This effect is due to the crystallization kinetics on a plain wall in a gravitational field. A patterned bottom wall that favors a specific hexagonal orientation was found to drastically reduce the number of stacking faults in the crystal.
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Dates
Type | When |
---|---|
Created | 22 years, 8 months ago (Dec. 12, 2002, 11:41 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 11, 2024, 5:23 a.m.) |
Indexed | 2 months, 2 weeks ago (June 11, 2025, 11:25 a.m.) |
Issued | 22 years, 8 months ago (Dec. 22, 2002) |
Published | 22 years, 8 months ago (Dec. 22, 2002) |
Published Print | 22 years, 8 months ago (Dec. 22, 2002) |
@article{Hoogenboom_2002, title={Stacking faults in colloidal crystals grown by sedimentation}, volume={117}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1522397}, DOI={10.1063/1.1522397}, number={24}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Hoogenboom, Jacob P. and Derks, Didi and Vergeer, Peter and van Blaaderen, Alfons}, year={2002}, month=dec, pages={11320–11328} }