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Colloid Process Engineering pp 205–220Cite as

Synthesis, Structure and Mechanics of Nano-Particulate Aggregates

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Abstract

In the most industrial processes nano-sized particles aggregate during their synthesis and the subsequent drying step forming aggregates with sizes in the order of several micrometers. The properties of these aggregates for application or further processing are specified by particle characteristics such as morphology, size, size distribution, bonding mechanism and structure of primary and secondary particles. In this study, the effect of the process parameters during particle synthesis and the following drying step on the structure formation and the resultant product and processing characteristics of precipitated nano-structured silica aggregates were investigated. For this purpose, the educts concentrations, stabilizing additives, mechanical energy input, pH-value and precipitation temperatures were varied during the precipitation process. In addition to the structure formation during precipitation, the resultant micromechanical aggregate properties of spherical silica model aggregates with a well-defined aggregate structure were characterized via nanoindentation and related to the aggregate structure and the interparticulate interaction forces. The micromechanical properties of these model aggregates were modelled depending on their structure using a modified form of the elementary breaking stress model of Rumpf. Since the characterization of particle-particle interactions in the nanometer size range is hardly possible, this effect on the aggregate fracture and deformation behavior was investigated by simulating the nanoindentation measurement of single aggregates using the “discrete element method”.

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Acknowledgements

The authors gratefully acknowledge the financial support by the DFG within the SPP 1273 “colloid technology”. The FIB-SEM pictures were kindly taken by Michael Kappl (MPI, Mainz). Many thanks for the support in the surface functionalization of model silica aggregates and addition of additives during precipitation to Sabrina Zellmer (Institute for Particle Technology, Braunschweig).

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Authors and Affiliations

  1. Institute for Particle Technology, TU Braunschweig, Volkmaroder Str. 5, 38104, Braunschweig, Germany

    Carsten Schilde & Arno Kwade

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  1. Carsten Schilde
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  2. Arno Kwade
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Correspondence to Carsten Schilde .

Editor information

Editors and Affiliations

  1. Institute of Thermal Process Engineering, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

    Matthias Kind

  2. Institute of Particle Technology, Friedrich-Alexander-Universität Erlangen, Erlangen, Germany

    Wolfgang Peukert

  3. Physical Chemistry II, TU Dortmund, Dortmund, Germany

    Heinz Rehage

  4. Institute of Process Engineering in Life Section I: Food Process Engineering, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

    Heike P. Schuchmann

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Schilde, C., Kwade, A. (2015). Synthesis, Structure and Mechanics of Nano-Particulate Aggregates. In: Kind, M., Peukert, W., Rehage, H., Schuchmann, H. (eds) Colloid Process Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-15129-8_9

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  • DOI: https://doi.org/10.1007/978-3-319-15129-8_9

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-15128-1

  • Online ISBN: 978-3-319-15129-8

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