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Sub-Micron Anisotropy in Super Insulation Nano-Fumed Silicas

34 Pages Posted: 14 Dec 2018 Publication Status: Accepted

See all articles by Belynda Benane

Belynda Benane

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510; University of Claude Bernard Lyon 1 - MATEB; EDF Energy - Research and Development

Guilhem P. Baeza

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510; University of Claude Bernard Lyon 1 - MATEB

Bruno Chal

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510; University of Claude Bernard Lyon 1 - MATEB

Lucian Roiban

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510; University of Claude Bernard Lyon 1 - MATEB

Sylvain Meille

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510; University of Claude Bernard Lyon 1 - MATEB

Christian Olagnon

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510; University of Claude Bernard Lyon 1 - MATEB

Bernard Yrieix

University of Claude Bernard Lyon 1 - MATEB; EDF Energy - Research and Development

Geneviève Foray

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510; University of Claude Bernard Lyon 1 - MATEB

Abstract

It is well accepted that global energy transition will be strongly dependent on energy saving. Here, we focus on describing the multi-scale structure of a fumed silica characterized by remarkably low thermal conductivity (ca. 2-5 mW.m-1.K-1) when used as a core material in vacuum insulating panels. While such powders are known to be highly polydisperse at different lengthscales (hardly quantifiable), we propose an original methodology based on small-angle X-ray scattering experiments with the aim of providing simple criteria for characterizing the morphology of these nanostructured silicas. Combining this technique with transmission electron microscopy, electron-tomography and mercury intrusion porosimetry also allow assigning the origin of the super-insulation to the pronounced and graduated anisotropy of the silica aggregates at lengthscales smaller than 500 nm. This result shows the need for nanometric structure tailoring and provides the basis for designing new synthesis routes scalable at the industrial level.

Keywords: silica, small angle X-ray scattering, insulator, electron tomography, fractal aggregate

Suggested Citation

Benane, Belynda and Baeza, Guilhem P. and Chal, Bruno and Roiban, Lucian and Meille, Sylvain and Olagnon, Christian and Yrieix, Bernard and Foray, Geneviève, Sub-Micron Anisotropy in Super Insulation Nano-Fumed Silicas (December 14, 2018). Available at SSRN: https://ssrn.com/abstract=3300938 or http://dx.doi.org/10.2139/ssrn.3300938

Belynda Benane (Contact Author)

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

University of Claude Bernard Lyon 1 - MATEB

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

EDF Energy - Research and Development

France

Guilhem P. Baeza

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510 ( email )

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

University of Claude Bernard Lyon 1 - MATEB ( email )

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

Bruno Chal

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

University of Claude Bernard Lyon 1 - MATEB

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

Lucian Roiban

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

University of Claude Bernard Lyon 1 - MATEB

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

Sylvain Meille

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

University of Claude Bernard Lyon 1 - MATEB

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

Christian Olagnon

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

University of Claude Bernard Lyon 1 - MATEB

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

Bernard Yrieix

University of Claude Bernard Lyon 1 - MATEB

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

EDF Energy - Research and Development

France

Geneviève Foray

University of Claude Bernard Lyon 1 - MATEIS-UMR CNRS 5510

43 Bl du 11 novembre 1918
Villeurbanne Cedex, Villeurbanne cedex 69621
France

University of Claude Bernard Lyon 1 - MATEB

43 Bl du 11 novembre 1918
Lyon, Villeurbanne cedex 69622
France

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