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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kroger, Roland
University of York
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2016Semiconductor-Metal Nano-Floret Hybrid Structures by Self-Processing Synthesiscitations
- 2013Microstructural evolution and nanoscale crystallography in scleractinian coral spherulitescitations
- 2013Formation and Structure of Calcium Carbonate Thin Films and Nanofibers Precipitated in the Presence of Poly(Allylamine Hydrochloride) and Magnesium Ionscitations
- 2011An artificial biomineral formed by incorporation of copolymer micelles in calcite crystalscitations
- 2008Interaction of Stacking Faults in Wurtzite a-Plane GaN on r-Plane Sapphire
- 2008The role of anisotropy for defect properties in a-plane GaN
- 2008The role of anisotropy for the defect properties in a-plane GaN - art. no. 689403
- 2007On the mechanism of dislocation and stacking fault formation in a-plane GaN films grown by hydride vapor phase epitaxy
- 2007Defect structure of a-plane GaN grown by hydride and metal-organic vapor phase epitaxy on r-plane sapphirecitations
- 2006The versatility of hot-filament activated chemical vapor depositioncitations
- 2006Anti-diffusion barriers for gold-based metallizations to p-GaN
- 2006TEM analyses of wurtzite InGaN islands grown by MOVPE and MBEcitations
- 2006Anisotropic spatial correlation of CdSe/Zn(S)Se quantum dot stacks grown by MBEcitations
- 2006Surface segregation of Si and Mg dopants in MOVPE grown GaN films revealed by X-ray photoemission spectro-microscopycitations
- 2005Surfactant-mediated epitaxy of Ge on Si(111)citations
- 2005Microstructure of highly p-type doped GaN sub-contact layers for low-resistivity contacts
- 2004Determination of the anisotropic optical properties for perfluorinated vanadyl phthalocyanine thin filmscitations
- 2004Microstructural study of quantum well degradation in ZnSe-based laser diodes
- 2002On the way to the II-VI quantum dot VCSELcitations
- 2002Plasma induced microstructural, compositional, and resistivity changes in ultrathin chemical vapor deposited titanium nitride filmscitations
Places of action
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article
Formation and Structure of Calcium Carbonate Thin Films and Nanofibers Precipitated in the Presence of Poly(Allylamine Hydrochloride) and Magnesium Ions
Abstract
That the cationic polyelectrolyte poly(allylamine hydrochloride) (PAH) exerts a significant influence on CaCO3 precipitation challenges the idea that only anionic additives have this effect. Here, we show that in common with anionic polyelectrolytes such as poly(aspartic acid), PAH supports the growth of calcite thin films and abundant nanofibers. While investigating the formation of these structures, we also perform the first detailed structural analysis of the nanofibers by transmission electron microscopy (TEM) and selected area electron diffraction. The nanofibers are shown to be principally single crystal, with isolated domains of polycrystallinity, and the single crystal structure is even preserved in regions where the nanofibers dramatically change direction. The formation mechanism of the fibers, which are often hundreds of micrometers long, has been the subject of intense speculation. Our results suggest that they form by aggregation of amorphous particles, which are incorporated into the fibers uniquely at their tips, before crystallizing. Extrusion of polymer during crystallization may inhibit particle addition at the fiber walls and result in local variations in the fiber nanostructure. Finally, we investigate the influence of Mg2+ on CaCO3 precipitation in the presence of PAH, which gives thinner and smoother films, together with fibers with more polycrystalline, granular structures.