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|Title:||Complex ceramic architectures by directed assembly of ‘responsive’ particles|
|Keywords:||Science & Technology;Technology;Materials Science, Ceramics;Materials Science;Directed assembly;Surface functionalization;Responsive polymers;Macro porous ceramics;Emulsion templating;MACROPOROUS CERAMICS;BIOMEDICAL APPLICATIONS;CELLULAR CERAMICS;ALUMINA FOAMS;EMULSIONS;SUSPENSIONS;POLYMERS;SURFACES;Materials;Materials Engineering|
|Description:||Surface functionalization of alumina powders with a responsive surfactant (BCS) leads to particles that react to a chemical switch. These ‘responsive’ building blocks are capable of assembling into macroscopic and complex ceramic structures. The aggregation follows a bottom up approach and can be easily controlled. The directed assembly of concentrated suspensions leads to highly dense (~99%) ceramic components with average 4-point bending strength of ~200 MPa. On the other hand, the emulsification of suspensions with concentrations from 7 to 43 vol% and 50 vol% decane results in emulsions with different properties (stability, droplet size and distribution). The oil droplets provide a soft template confining the alumina particles in the continuous phase and at the oil/water interfaces. Aggregation of these emulsions followed by drying and sintering leads to macroporous (pore sizes ranging from 30 to 4 µm) alumina structures with complex shapes and a wide range of microstructures, from closed cell structures to highly interconnected foams with total porosities up to 83%. Alumina scaffolds with ~55 % porosity can reach crushing strength values above 300 MPa in compression and ~50 MPa in 4-point bending.|
|Type Of Material:||OTHER|
|Appears in Collections:||Faculty of Engineering|
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