Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 3066-3075 |
| Seitenumfang | 10 |
| Fachzeitschrift | Crystal Growth and Design |
| Jahrgang | 12 |
| Ausgabenummer | 6 |
| Publikationsstatus | Veröffentlicht - 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.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Allgemeine Chemie
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
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in: Crystal Growth and Design, Jahrgang 12, Nr. 6, 23.04.2012, S. 3066-3075.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Evolution of the morphologies of zinc oxide mesocrystals under the influence of natural polysaccharides
AU - Waltz, Florian
AU - Wißmann, Gesa
AU - Lippke, Jann
AU - Schneider, Andreas M.
AU - Schwarz, Hans Christoph
AU - Feldhoff, Armin
AU - Eiden, Stefanie
AU - Behrens, Peter
PY - 2012/4/23
Y1 - 2012/4/23
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84861889737&partnerID=8YFLogxK
U2 - 10.1021/cg3002674
DO - 10.1021/cg3002674
M3 - Article
AN - SCOPUS:84861889737
VL - 12
SP - 3066
EP - 3075
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 6
ER -