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Publisher DOI: 10.3390/molecules25204790
Title: Mapping the mechanical properties of hierarchical supercrystalline ceramic-organic nanocomposites
Language: English
Authors: Bor, Büsra 
Heilmann, Lydia 
Domènech, Berta 
Kampferbeck, Michael 
Vossmeyer, Tobias 
Weller, Horst 
Schneider, Gerold A. 
Giuntini, Diletta 
Keywords: supercrystalline material;nanocomposite;hierarchical material;mechanical behavior;nanoindentation;fracture toughness
Issue Date: 19-Oct-2020
Publisher: Multidisciplinary Digital Publishing Institute
Source: Molecules 25 (20): 4790 (2020)
Journal: Molecules 
Abstract (english): 
Multiscale ceramic-organic supercrystalline nanocomposites with two levels of hierarchy have been developed via self-assembly with tailored content of the organic phase. These nanocomposites consist of organically functionalized ceramic nanoparticles forming supercrystalline micron-sized grains, which are in turn embedded in an organic-rich matrix. By applying an additional heat treatment step at mild temperatures (250–350 °C), the mechanical properties of the hierarchical nanocomposites are here enhanced. The heat treatment leads to partial removal and crosslinking of the organic phase, minimizing the volume occupied by the nanocomposites’ soft phase and triggering the formation of covalent bonds through the organic ligands interfacing the ceramic nanoparticles. Elastic modulus and hardness up to 45 and 2.5 GPa are attained, while the hierarchical microstructure is preserved. The presence of an organic phase between the supercrystalline grains provides a toughening effect, by curbing indentation-induced cracks. A mapping of the nanocomposites’ mechanical properties reveals the presence of multiple microstructural features and how they evolve with heat treatment temperature. A comparison with non-hierarchical, homogeneous supercrystalline nanocomposites with lower organic content confirms how the hierarchy-inducing organic excess results in toughening, while maintaining the beneficial effects of crosslinking on the materials’ stiffness and hardness.
DOI: 10.15480/882.3026
ISSN: 1420-3049
Other Identifiers: doi: 10.3390/molecules25204790
Institute: Keramische Hochleistungswerkstoffe M-9 
Document Type: Article
More Funding information: Ministry of National Education of the Republic of Turkey
Project: SFB 986: Teilprojekt A6 - Herstellung und Charakterisierung hierarchischer, multi-funktionaler Keramik/Metall-Polymer Materialsysteme 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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