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High-pressure liqui...
High-pressure liquid dispersion and fragmentation of flame-made silica agglomerates
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Wengeler, R (författare)
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Teleki, A (författare)
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Vetter, M (författare)
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Pratsinis, S E (författare)
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Nirschl, H (författare)
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- 2006-04-18
- 2006
- Engelska.
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Ingår i: Langmuir. - Univ Karlsruhe, Inst Mech Proc Engn & Mech, D-76128 Karlsruhe, Germany. ETH, Particle Technol Lab, Dept Mech & Proc Engn, CH-8092 Zurich, Switzerland. : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 22:11, s. 4928-4935
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The influence of primary particle diameter and the degree of agglomeration of flame-made silica agglomerate suspensions in aqueous solutions is studied by high-pressure dispersion (up to 1500 bar) through a nozzle with a 125 Am inner diameter. These particles were produced (4-15 g/h) by oxidation of hexamethyldisiloxane (HMDSO) in a coflow diffusion flame reactor. Their average primary particle size (10-50 nm) and degree of agglomeration were controlled by varying the oxygen and precursor flow rates. The particles were characterized by nitrogen adsorption, electron microscopy, and small-angle X-ray scattering. Hydrodynamic stresses break up soft agglomerates and yield hard agglomerate sizes in the range of 100-180 nm, as characterized by dynamic light scattering. Soft agglomerates exhibited decreasing light scattering diameters with increasing dispersion pressure, while hard agglomerates were insensitive.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
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