Berlin 2018 – wissenschaftliches Programm

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SYAM: Symposium Physics of Ancient Materials

SYAM 1: Physics of Ancient Materials

SYAM 1.3: Hauptvortrag

Freitag, 16. März 2018, 10:30–11:00, H 0105

Morphology and topology of multiscale pore networks: Imaging structural alteration and hydric invasion — •Pierre Levitz — Phenix laboratory, Univ. Pierre et Marie Curie, Paris, France

Most geomaterials, such as clayed soils, rocks and building materials, exhibit a complex and hierarchical porous structure generally ranging from nanometer to macroscopic scale. The multiscale organization of pore network is a cornerstone, influencing transport properties (diffusion-permeation) and mechanical strength. The textural evolution in time is a challenging question, especially during structural alteration such as dissolution-reprecipitation [1] or fluid invasion [2]. Similar questions are also encountered in the domain of cultural heritage where ancient materials [2,3] can be a source of inspiration to design new systems or to improve specific preservation strategies.

In this conference, we will show how micro and nano X ray or neutron microcopies [4], small angle X ray and neutron scattering (SAXS and SANS) [5] and ptychography [6] are attractive and no destructive tools for the investigation of the structural evolution of these strongly disordered systems. These experiments have the ability to probe a hierarchical organization on a large length scale ranging from nm to few hundred nanometers. This multimodal structural analysis offers the possibility to build constrained models mimicking observed geometrical features [7]. These models can then be used to simulate various transport and/or mechanical properties in relation with the pore network topology [1,7].

[1] Topology of evolving pore networks. Levitz, P; Tariel, V ; Stampanoni; Gallucci, E, European Phys. J. Applied Physics. Vol 60, 24202 (2012)

[2] Neutron imaging investigation of fossil woods: non-destructive characterization of microstructure and detection of in situ changes as occurring in museum cabinets, G.P. Odin, V. Rouchon, F. Ott, N. Malikova, P. Levitz, L.J. Michot. Fossil record. Vol 20, 95-103, (2017).

[3] Material and Elastic Properties of Al–Tobermorite in Ancient Roman Seawater Concrete. Jackson, MD; Moon, J; Gotti, E; Taylor, R; Chae, SR ; Kunz, M ; Emwas, AH; Meral, C; Guttmann, P; Levitz, P ; Pierre; Wenk, Hans-Rudolf; Monteiro, Paulo J. . J. Am. Ceram. Soc. Vol 96, 2598–2606 (2013)

[4] Morphological quantification of hierarchical geomaterials by X-ray nano-CT bridges the gap from nano to micro length scales. ) Brisard, S; Chae, RS; Bihannic, I; Michot, L; Guttmann, P; Thieme, J; Schneider, G; Monteiro, PJM ; Levitz, P. American Mineralogist, Vol: 97, 480-483 (2012).

[5] Coagulation of Na-Montmorillonite by Inorganic Cations at Neutral pH. A Combined Transmission X-ray Microscopy, Small Angle and Wide Angle X-ray Scattering Study. Laurent J. Michot, Isabelle Bihannic, Fabien Thomas, Bruno S. Lartiges, Yves Waldvogel, Céline Caillet, Juergen Thieme, Sergio S. Funari, Pierre Levitz, Langmuir Vol 29, 3500-3510 (2013)

[6] Soft X-ray Ptychographic Imaging and Morphological Quantification of Calcium Silicate Hydrates (C–S–H). Sungchul Bae, Rae Taylor, David Shapiro,Peter Denes, John Joseph, Rich Celestre, Stefano Marchesini, Howard Padmore, Tolek Tyliszczak, Tony Warwick, David Kilcoyne, Pierre Levitz and Paulo J.M Monteiro. J. Am. Ceram. Soc. Vol 98, 4090-4095 (2015)

[7] Mesoscale texture of cement hydrates. Ioannidou, K , Krakowiak, Bauchy, M , Hoover, CG, Masoero, E, Yip, S, Ulm, FJ, Levitz, P, Pellenq, RJM, Del Gado, E. PNAS. Vol 113, 2029-2034 (2016)