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Aggregation-governed oriented growth of inorganic crystals at an organic template
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10.1063/1.2424937
/content/aip/journal/jcp/125/22/10.1063/1.2424937
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/22/10.1063/1.2424937
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Figures

Image of FIG. 1.
FIG. 1.

Cadmium carbonate nucleation under a fatty acid Langmuir monolayer: (a) Typical in-plane diffraction scan of interfacial cadmium carbonate. All allowed strong peaks are visible (labeled with curly brackets). The degenerate peak closest to origin is a monolayer peak. (b) “Debye” ring scans for inorganic peaks. At low cadmium ion concentration in the subphase (∎, ), the uniform intensity distribution in ring scans indicates an absence of preferred crystallographic orientation. At higher cadmium ion concentration (▴, ), cadmium carbonate nucleate is preferentially oriented with {0 1 2} crystal face parallel to the water surface.

Image of FIG. 2.
FIG. 2.

Manganese carbonate nucleation under a fatty acid Langmuir monolayer: (a) typical in-plane diffraction scan of interfacial rhodochrosite. All allowed strong peaks are visible (labeled with curly brackets). The peaks closest to origin are monolayer peaks. (b) “Debye” ring scans for inorganic peaks. At low manganese ion concentration in the subphase (∎, ), the uniform intensity distribution in ring scans indicates an absence of preferred crystallographic orientation. At higher manganese ion concentration (●, and ▴, ), manganese carbonate nucleate is preferentially oriented with {0 1 2} crystal face parallel to the water surface.

Image of FIG. 3.
FIG. 3.

Predominant morphologies of cadmium carbonate crystals grown (a) in the absence of an organic template, (b) under alcohol monolayers, and (c) under fatty acid monolayers.

Image of FIG. 4.
FIG. 4.

Predominant morphologies observed during manganese carbonate crystal growth: [(a) and (b)] in the absence of an organic template, (c) under alcohol monolayers, and (d) under fatty acid monolayers.

Image of FIG. 5.
FIG. 5.

Nucleation under fatty acid and alcohol monolayers: discrete crystals at low concentrations. (a) crystals, grown under fatty acid monolayers, at an ionic concentration of and (b) crystals, grown under alcohol monolayers (concentration ). Crystals were collected after spreading the monolayer. crystals grown under alcohol monolayers and collected after similar duration had already aggregated. The nucleation density under alcohol monolayers is much lower than that under fatty acid monolayers. At higher concentrations (within .) or even at low concentrations after longer durations , the nucleate under fatty acid monolayers consists of sheets of linear chains (c). GID data also show a time dependent enhanced preferred orientation for crystals grown under fatty acid monolayers. We attribute this enhanced alignment to aggregation. Even crystals formed under alcohol monolayers tend to aggregate (d). Note that at higher concentrations, crystals become rounded and are smaller in size [compare Figs. 5 and 4(c)]. Linear chainlike structures of crystals grown under fatty acid monolayers: (after ) (e) and after . (f).

Image of FIG. 6.
FIG. 6.

Lower bound estimates for the degrees of preferred orientation: Assumed 3D powder intensities (●), obtained from the observed background (∎), are subtracted from peaks with the most symmetrical intensity distributions (▴) along “Debye” rings: (a) {1 0 4} for CdCO3 and (b) {1 1 3} for MnCO3.

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/content/aip/journal/jcp/125/22/10.1063/1.2424937
2006-12-14
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Aggregation-governed oriented growth of inorganic crystals at an organic template
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/22/10.1063/1.2424937
10.1063/1.2424937
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