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Spiral Growth on Nanoporous Silicoaluminophosphate STA-7 as Observed by Atomic Force Microscopy
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2009 (English)In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 9, no 9, 4041-4050 p.Article in journal (Refereed) Published
Abstract [en]

Atomic force microscopy was used to study the surface of STA-7 crystals. STA-7 is a silicoaluminophosphate, nanoporous solid formed by interlinked double six ring units (D6R). Observations showed the formation of three distinct types of spirals at tow supersaturation conditions. The {001} face shows spirals with isotropic shapes and a Burgers vector of 0.9 nm, which corresponds to one D6R or one unit cell along the < 001 > direction. The {100} face contains two distinct types of spirals. The first has a Burgers vector of 0.9 rim, or half a unit cell along < 100 >. This dislocation produces a change in the ""stacking"" sequence of the D6Rs generating all overgrowth with the AEI structure. The second type is an interlaced spiral and is generated by a dislocation with a Burgers vector of 1.8 nm or one unit cell, leading to the formation of two substeps each with a different growth anisotropy. This anisotropy is directed by the shape of the substep and the energetics of template attachment. The preponderance of a surface coating of a secondary phase will have significant consequences on applications reliant on intracrystalline diffusion, such as catalysis, where, owing to diffusion limitations, the outermost structure dominates the functional properties.

Place, publisher, year, edition, pages
2009. Vol. 9, no 9, 4041-4050 p.
Keyword [en]
crystal-growth, natural heulandite, surface-structure, porous materials, zeolite-a, solids, afm, mechanisms, calcite, time
National Category
Inorganic Chemistry
URN: urn:nbn:se:su:diva-59980DOI: 10.1021/cg900255uISI: 000269375800035OAI: diva2:432260
authorCount :9Available from: 2011-08-02 Created: 2011-08-02 Last updated: 2011-08-02Bibliographically approved

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Stevens, Sam M.
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Inorganic and Structural Chemistry
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