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Spiral Growth on Na...
Spiral Growth on Nanoporous Silicoaluminophosphate STA-7 as Observed by Atomic Force Microscopy
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Cubillas, Pablo (author)
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Castro, Maria (author)
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Jelfs, Kim E. (author)
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Lobo, Alan J. W. (author)
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Slater, Ben (author)
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Lewis, Dewi W. (author)
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Wright, Paul A. (author)
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- Stevens, Sam M. (author)
- Stockholms universitet,Avdelningen för oorganisk kemi och strukturkemi
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Anderson, Michael W. (author)
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(creator_code:org_t)
- 2009-08-07
- 2009
- English.
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In: Crystal Growth & Design. - : American Chemical Society (ACS). - 1528-7483 .- 1528-7505. ; 9:9, s. 4041-4050
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Keyword
- crystal-growth
- natural heulandite
- surface-structure
- porous materials
- zeolite-a
- solids
- afm
- mechanisms
- calcite
- time
- Inorganic chemistry
- Oorganisk kemi
Publication and Content Type
- ref (subject category)
- art (subject category)
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