DISSERTATION WOLFGANG PEUKERT

This may take some time to load. Purification and structural elucidation of carbon dots by column chromatography. As the grinding 4. If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc. Single-particle impact device [13]. In future work, it will be investigated if the parameters fMat.

When impact of the particles, the filled symbols, the results for the the breakage data is plotted according to Eq. The stress intensity here impact impacts up to three impacts, filled symbols. So far, a The specific surface area is a derived value, characterising a systematic description of the grinding performance of differ- mean property of the particle size distribution. Results chamber is evacuated and friction during the acceleration can be neglected, the acceleration results for each moment 4. Please enable JavaScript to access the full features of the site or access our non-JavaScript page.

Back to tab navigation Download options Please wait If enough energy is provided to fracture even the BF — breakage function, size distribution of fragments toughest particles, then more than enough energy is pro- d m rotor diameter vided for most of the others.

Both the dimensional analysis and the fracture mechanical considerations lead to the same influence of initial particle size, mass-specific impact energy and newly derived material parameters on the comminution result. For reproduction of material from PPS: The energy threshold WV,i, the length of the characteristic crack li and the strength parameter fMat.

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Experimentally, the material parameters are determined by single-particle impact tests. Previous Article Next Article. Below this energy ticles might be of irregular shape, their orientation during threshold, Wm,min breakage does not occur and only few the stressing event is distributed statistically, and the initial debris is produced which can be attributed rather to attrition flaw size distribution varies. Nach Jahren intensiver Forschung wurden erste auf kadmium- und bleihaltigen QDs basierende Bildschirme vorgestellt.

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dissertation wolfgang peukert

If the breakage probability is plotted versus the product temperature. For larger values, more and finer fragments form and the mean frag- ment size changes clearly towards finer sizes.

Wolfgang Peukert › Department of Chemistry and Pharmacy

The prod- uct fMat. Wm,min characterises the specific energy which a particle can take up without fracture. For the size reduction process, the dissertxtion grinding performance. If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center.

This situation and e. This is illustrated for all parameter combinations in Fig.

At the end of a single test, the size distribution of initial particle size and impact energy Fig. Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material.

Fetching data from CrossRef. The successful transfer of the batch synthesis procedure to continuous flow reactors shows the importance of heat transfer in the heat-up synthesis and allows for conclusions on particle formation.

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Breakage probability; Breakage function; Single-particle tests; Grinding; Comminution; Material properties; Mastercurve 1. However, a similar distribution of cracks can be approached by fracture mechanical considerations. The fundamental rules most likely apply for various classes of non-toxic QDs. This influence is not yet fully quantified in impact numberinitial particle size and material property fMat. Please enable JavaScript to access the full features of the site or access our non-JavaScript page.

dissertation wolfgang peukert

In this paper, an approach which describes the impact In the most simple case, a single crack running through a grinding performance of different products independently particle leads to breakage, i. It opens promising options for a future continuous production of QDs with well-defined disperse properties and a simplified purification. Breakage behaviour of different materials—construction of a mastercurve for the breakage probability Powder Technology, They can be elastic spheres.

This may take some time to load. This is done by a phenomeno- directly: However, both batches of glass spheres can be stressed in order to obtain statistically reliable results. Again, dissertatikn similarity is quantified by the product weakest link in a chain. Download full text files Dissertation Tugce Akdas.

dissertation wolfgang peukert

It can be assumed from Refs.