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- W1973000348 abstract "In situ atomic force microscopy (AFM) has been used to observe potassium sulfate crystals growing in the presence of acid fuchsin and pyranine. These polysulfonated dyes are well known for their ability to adsorb onto the {1 1 0} and {0 1 0} (pyranine only) crystal faces. Using AFM, we analyzed the changes in surface micromorphology induced by the additives on advancing steps for the {1 1 0} and {0 1 0} surfaces. In situ AFM showed that layers grow by step flow at pre-existing steps by the addition of growth units at the step edges. It has been found that dye concentrations as low as ∼2×10−6 M for pyranine and ∼4×10−4 M for acid fuchsin produce significant changes in the step morphology and growth rates. The additive molecules attach to the terraces and pin the growing front. As a consequence, the edges of the growing steps become jagged as the dye molecules are adsorbed onto the crystal surface. At critical dye concentrations crystal growth is heavily hampered or even stopped along certain crystallographic directions producing, on a macroscopic scale, strong habit modifications. The formation of dye inclusions by means of macrosteps overgrowing the poisoned surface was also imaged. Interestingly, comparison of the in situ AFM experiments with previous habit modification studies showed acid fuchsin is also able to enter the {0 1 0} surfaces, a previously unnoticed phenomenon." @default.
- W1973000348 created "2016-06-24" @default.
- W1973000348 creator A5065521708 @default.
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- W1973000348 date "2000-01-01" @default.
- W1973000348 modified "2023-09-26" @default.
- W1973000348 title "Growth of potassium sulfate crystals in the presence of organic dyes: in situ characterization by atomic force microscopy" @default.
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- W1973000348 doi "https://doi.org/10.1016/s0022-0248(99)00401-7" @default.
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