Abstract
To improve the understanding of the poor dispersability of fumed silica nanoparticle agglomerates, the stability of highly defined agglomerated model particles was investigated. The high temperature synthesis conditions for fumed silica were simulated by tempering. Along with electron-microscopical analysis of the sintering necks, the interparticle forces were investigated by energy resolved fragmentation analysis based on low pressure impaction. At temperatures above 1,000 °C the fragmentability of the agglomerates rapidly decreased while the energy necessary for fragmentation increased. The development of sintering necks was observed for temperatures exceeding 1,300 °C. Comparison of the experimental data with the fragmentation behaviour of a commercially produced fumed silica indicated solid state contacts (sintering necks) as being most numerous in the agglomerates resulting in limited fragmentability.
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References
Bandyopadhyaya R, Rong W, Friedlander SK (2004) Dynamics of chain aggregates of carbon nanoparticles in isolation and in polymer films: Implications for nanocomposite materials. Chem Mater 16:3147–3154
Bikiaris DN, Papageorgiou GZ, Pavlidou E, Vouroutzis N, Palatzoglou P, Karayannidis GP (2005) Preparation by melt mixing and characterization of isotactic polypropylene/SiO2 nanocomposites containing untreated and surface-treated nanoparticles. J Appl Polym Sci 100:2684–2696
Kirchhof MJ, Schmid H-J, Peukert W (2004) Reactor system for the study of high-temperature short-time sintering of nanoparticles. Rev Sci Instrum 75:4833–4840
Kirchhof MJ, Schmid H-J, Peukert W (2009) (in preparation)
Oberdörster G, Ferin J, Gelein R, Soderholm SC, Finkelstein J (1992) Role of the alveolar macrophage in lung injury: studies with ultrafine particles. Environ Health Perspect 97:193–199
Pohl M, Schubert H, Schuchmann HP (2005) Herstellung stabiler Dispersionen aus pyrogener Kieselsäure. Chem Ing Tech 77:258–262
Rejman J, Oberle V, Zuhorn IS, Hoekstra D (2004) Size-dependent internalization of particles via the clathrin- and caveolae-mediated endocytosis. Biochem J 377:159–169
Seipenbusch M, Froeschke S, Weber AP, Kasper G (2002) Investigations on the fracturing of nanoparticle agglomerates—first results. J Proc Mech Eng 216:219–225
Seipenbusch M, Toneva P, Peukert W, Weber AP (2007) Impact fragmentation of metal nanoparticle agglomerates. Part Part Syst Charact 24:193–200
Valverde JM, Castellanos A (2008) Fluidization of nanoparticles: a simple equation for estimating the size of agglomerates. Chem Eng J 140:296–304
Wang Y, Gu G, Wei F, Wu J (2002) Fluidization and agglomerate structure of SiO2 nanoparticles. Powder Technol 124:152–159
Wengeler R, Teleki A, Vetter M, Pratsinis SE, Nirschl H (2006) High-pressure liquid dispersion and fragmentation of flame-made silica agglomerates. Langmuir 22:4928–4935
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The authors express their gratitude for the funding of this project by the Deutsche Forschungsgemeinschaft under grant number KA 1373.
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Seipenbusch, M., Rothenbacher, S., Kirchhoff, M. et al. Interparticle forces in silica nanoparticle agglomerates. J Nanopart Res 12, 2037–2044 (2010). https://doi.org/10.1007/s11051-009-9760-5
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DOI: https://doi.org/10.1007/s11051-009-9760-5