Evolution of the morphologies of zinc oxide mesocrystals under the influence of natural polysaccharides

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Original languageEnglish
Pages (from-to)3066-3075
Number of pages10
JournalCrystal Growth and Design
Volume12
Issue number6
Publication statusPublished - 23 Apr 2012

Abstract

In the present investigation, we have analyzed the influence of naturally occurring negatively charged polysaccharides on the morphology of zinc oxide obtained in low-temperature precipitation experiments. Performing detailed analyses of scanning electron microscopy (SEM) micrographs, we inferred the morphology of individual nanocrystals as well as the construction of their aggregates. X-ray and electron diffraction were used to identify directions of preferred growth. Whereas addition of hyaluronic acid (HYA) to the synthesis batch resulted in a rod-like morphology of the primary crystallites, addition of chondroitin-6-sulfate (C6S) leads to platelet-like crystallites. Despite their different shapes, the respective subunits aggregated in similar ways, with perfect orientation with regard to their a-b planes, thus leading to symmetrical superstructures. Further growth proceeded, via different mechanisms, that is, subunit growth or further aggregation of subunits, dependent on whether the precipitation was performed in the presence of HYA or C6S. These details were elucidated by testing different concentrations and reaction times. The formation of the morphological characteristics could be attributed to subtle differences in the nature of the two polysaccharides. Understanding how to direct the formation of mesocrystal morphologies is important for enhancing material properties, especially for highly demanding applications of zinc oxide, such as semiconducting films.

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Evolution of the morphologies of zinc oxide mesocrystals under the influence of natural polysaccharides. / Waltz, Florian; Wißmann, Gesa; Lippke, Jann et al.
In: Crystal Growth and Design, Vol. 12, No. 6, 23.04.2012, p. 3066-3075.

Research output: Contribution to journalArticleResearchpeer review

Waltz F, Wißmann G, Lippke J, Schneider AM, Schwarz HC, Feldhoff A et al. Evolution of the morphologies of zinc oxide mesocrystals under the influence of natural polysaccharides. Crystal Growth and Design. 2012 Apr 23;12(6):3066-3075. doi: 10.1021/cg3002674
Waltz, Florian ; Wißmann, Gesa ; Lippke, Jann et al. / Evolution of the morphologies of zinc oxide mesocrystals under the influence of natural polysaccharides. In: Crystal Growth and Design. 2012 ; Vol. 12, No. 6. pp. 3066-3075.
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abstract = "In the present investigation, we have analyzed the influence of naturally occurring negatively charged polysaccharides on the morphology of zinc oxide obtained in low-temperature precipitation experiments. Performing detailed analyses of scanning electron microscopy (SEM) micrographs, we inferred the morphology of individual nanocrystals as well as the construction of their aggregates. X-ray and electron diffraction were used to identify directions of preferred growth. Whereas addition of hyaluronic acid (HYA) to the synthesis batch resulted in a rod-like morphology of the primary crystallites, addition of chondroitin-6-sulfate (C6S) leads to platelet-like crystallites. Despite their different shapes, the respective subunits aggregated in similar ways, with perfect orientation with regard to their a-b planes, thus leading to symmetrical superstructures. Further growth proceeded, via different mechanisms, that is, subunit growth or further aggregation of subunits, dependent on whether the precipitation was performed in the presence of HYA or C6S. These details were elucidated by testing different concentrations and reaction times. The formation of the morphological characteristics could be attributed to subtle differences in the nature of the two polysaccharides. Understanding how to direct the formation of mesocrystal morphologies is important for enhancing material properties, especially for highly demanding applications of zinc oxide, such as semiconducting films.",
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AU - Wißmann, Gesa

AU - Lippke, Jann

AU - Schneider, Andreas M.

AU - Schwarz, Hans Christoph

AU - Feldhoff, Armin

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AU - Behrens, Peter

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