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Dronova M, Lécolier E, Barré L, Michot LJ. Phase diagram, structure and rheology of boehmite dispersions: role of electrostatic interactions. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Speyer L, Humbert S, Bizien T, Lecocq V, Hugon A. Peptization of boehmites with different peptization index: An electron microscopy and synchrotron small-angle X-ray scattering study. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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M'Barki A, Bocquet L, Stevenson A. Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing. Sci Rep 2017; 7:6017. [PMID: 28729671 PMCID: PMC5519596 DOI: 10.1038/s41598-017-06115-0] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 06/08/2017] [Indexed: 11/09/2022] Open
Abstract
Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactured by direct ink writing. Boehmite suspensions undergo time dependent gelation, thus providing a rheological laboratory of flow behaviours that can be correlated with printability requirements. We measured the evolution of rheological properties over several days and quantified the deformation of simple printed shapes at different aging times. We then identified the relevant physical parameters leading to printable suspensions. We defined a dimensionless number, Ξ, based on measured rheological properties, that predicts deformation of the printed object and determines the printability criterion. An important difference with this criterion is that Ξ necessarily accounts for capillary forces and gravitational slumping. We show that boehmite inks reach a printed shape fidelity > 90% when Ξ > 1, and that Al2O3 bars printed under these conditions can be sintered to 97% density, without printing defects, and have flexural strengths (500-600 MPa) competitive with commercial aluminas. Using Ξ, researchers can rationally design inks for printing dense materials by tailoring their rheological properties such that Ξ ≈ 1.
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Affiliation(s)
- Amin M'Barki
- Saint-Gobain CREE/Université Lyon I, LSFC Lab, Cavaillon, 84300, France.
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van der Beek D, Lekkerkerker HNW. Liquid crystal phases of charged colloidal platelets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:8582-8586. [PMID: 15379478 DOI: 10.1021/la049455i] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The liquid crystal phase behavior of a suspension of charged gibbsite [Al(OH)3] platelets is investigated. By variation of the ionic strength, we are able to tune the effective thickness-to-diameter ratio of the platelets in suspension. This enables us to experimentally test the liquid crystal phase transition scenario that was first predicted a decade ago by computer simulations for hard platelets (Veerman, J. A. C.; Frenkel, D. Phys. Rev. A 1992, 45, 5632), that is, the isotropic (I) to nematic (N) and isotropic to columnar (C) phase transitions in one colloidal suspension. In addition to the shape-dependent thermodynamic driving force, the effect of gravity is important. For example, a biphasic (I-N) suspension becomes triphasic (I-N-C) on prolonged standing. This effect is described by a simple osmotic compression model.
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Affiliation(s)
- David van der Beek
- Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH, The Netherlands
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Billamboz N, Baba M, Grivet M, Nedelec JM. A General Law for Predictive Use of Thermoporosimetry as a Tool for the Determination of Textural Properties of Divided Media. J Phys Chem B 2004. [DOI: 10.1021/jp048189e] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicolas Billamboz
- Laboratoire de Microanalyses Nucléaires Alain Chambaudet, UMR CEA, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR CNRS 6505, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue des Landais 63174 Aubière Cedex France, and Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue
| | - Mohamed Baba
- Laboratoire de Microanalyses Nucléaires Alain Chambaudet, UMR CEA, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR CNRS 6505, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue des Landais 63174 Aubière Cedex France, and Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue
| | - Manuel Grivet
- Laboratoire de Microanalyses Nucléaires Alain Chambaudet, UMR CEA, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR CNRS 6505, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue des Landais 63174 Aubière Cedex France, and Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue
| | - Jean-Marie Nedelec
- Laboratoire de Microanalyses Nucléaires Alain Chambaudet, UMR CEA, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex France, Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR CNRS 6505, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue des Landais 63174 Aubière Cedex France, and Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, Ecole Nationale Supérieure de Chimie de Clermont Ferrand et Université Blaise Pascal, 24 Avenue
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Martens WN, Kloprogge JT, Frost RL, Bartlett JR. A Crystallite Packing Model for Pseudoboehmite Formed during the Hydrolysis of Trisecbutoxyaluminium to Explain the Peptizability. J Colloid Interface Sci 2002; 247:132-7. [PMID: 16290448 DOI: 10.1006/jcis.2001.8079] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2001] [Accepted: 10/29/2001] [Indexed: 11/22/2022]
Abstract
A model for pseudoboehmite crystallite packing formed during the hydrolysis of trisecbutoxyaluminium is postulated. The model describes platelike crystallites of pseudoboehmite stacked in a sharing edges only configuration. With this type of stacking, the pore sizes detected are approximately equal to the crystallite sizes of the hydrolysates. The hydrolysates age via a dissolution re-precipitation reaction. This increases the size of the crystallite size of the pseudoboehmite formed, speeding peptization by allowing nitrate ions to enter pores and access the surfaces of the crystallites. This type of model also allows an explanation for the peptization kinetics of systems containing sec-butanol formed during the hydrolysis of trisecbutoxyaluminium.
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Affiliation(s)
- Wayde N Martens
- Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, GPO Box 2434, 2 George Street, Brisbane, Queensland, 4001, Australia.
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van Bruggen M, Donker M, Lekkerkerker H, Hughes T. Anomalous stability of aqueous boehmite dispersions induced by hydrolyzed aluminium poly-cations. Colloids Surf A Physicochem Eng Asp 1999. [DOI: 10.1016/s0927-7757(98)00728-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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