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Publisher DOI: 10.1002/adem.202000352
Title: Strong macroscale supercrystalline structures by 3D printing combined with self-assembly of ceramic functionalized nanoparticles
Language: English
Authors: Domènech Garcia, Berta 
Tan, Alvin T. L. 
Jelitto, Hans 
Zegarra Berodt, Eduardo 
Blankenburg, Malte 
Focke, Oliver 
Cann, Jaclyn 
Cem Tasan, Cemal 
Colombi Ciacchi, Lucio 
Müller, Martin 
Pagnan Furlan, Kaline 
Hart, A. John 
Schneider, Gerold A. 
Keywords: 3D printing;colloidal assemblies;mechanical strengths;nanocomposites;supercrystals
Issue Date: 29-Apr-2020
Publisher: Wiley-VCH Verl.
Source: Advanced Engineering Materials 7 (22): 2000352 (2020-07-01)
Journal: Advanced engineering materials 
Abstract (english): 
To translate the exceptional properties of colloidal nanoparticles (NPs) to macroscale geometries, assembly techniques must bridge a 106-fold range of length. Moreover, for successfully attaining a final mechanically robust nanocomposite macroscale material, some of the intrinsic NPs’ properties have to be maintained while minimizing the density of strength-limiting defects. However, the assembly of nanoscale building blocks into macroscopic dimensions, and their effective macroscale properties, are inherently affected by the precision of the conditions required for assembly and emergent flaws including point defects, dislocations, grain boundaries, and cracks. Herein, a direct-write self-assembly technique is used to construct free-standing, millimeter-scale columns comprising spherical iron oxide NPs (15 nm diameter) surface functionalized with oleic acid (OA), which self-assemble into face-centered cubic (FCC) supercrystals in minutes during the direct-writing process. The subsequent crosslinking of OA molecules results in nanocomposites with a maximum strength of 110 MPa and elastic modulus up to 58 GPa. These mechanical properties are interpreted according to the flaw size distribution and are as high as newly engineered platelet-based nanocomposites. The findings indicate a broad potential to create mechanically robust, multifunctional 3D structures by combining additive manufacturing with colloidal assembly.
DOI: 10.15480/882.2968
ISSN: 1438-1656
Institute: Keramische Hochleistungswerkstoffe M-9 
Document Type: Article
More Funding information: Financial support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Projektnummer 192346071, SFB 986 -, the National Science Foundation CAREER Award (CMMI-1346638, to A.J.H.), and from the MIT-Skoltech Next Generation Program. A.T.L.T. was supported by a postgraduate fellowship from DSO National Laboratories, Singapore. XRM at the University of Bremen was funded within the CO 1043 12-1 (Call for Major Equipment, XRM).
Project: SFB 986: Teilprojekt A6 - Herstellung und Charakterisierung hierarchischer, multi-funktionaler Keramik/Metall-Polymer Materialsysteme 
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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