Problems in Characterizing Transparent Particles by Laser Light Diffraction Spectrometry

Teipel, Ulrich

doi:10.1002/1521-4125(200201)25:1<13::aid-ceat13>3.0.co;2-a

Cited by 13 publications

(3 citation statements)

References 4 publications

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“…The MWCNTs used in our work have diameters of 100-150 nm, lengths of 10-20 µm, and the incident irradiation of the particle size analyzer is λ = 405 nm. Therefore, the Mie parameters, α ( = πd/λ, d particle diameter, λ = wavelength of incident light [32]), for categorizing the scattering behavior by the interaction between a single particle and incident light range from 0.78 to 1.16 for nanotube breadths and from 77 to 155 for lengths. The α values lie in the region of Mie scattering and geometric optic scattering [32].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the Mie parameters, α ( = πd/λ, d particle diameter, λ = wavelength of incident light [32]), for categorizing the scattering behavior by the interaction between a single particle and incident light range from 0.78 to 1.16 for nanotube breadths and from 77 to 155 for lengths. The α values lie in the region of Mie scattering and geometric optic scattering [32]. Supposing that the samples are optically isotropic spheres, therefore, the particle size can be determined from the scattered light distribution.…”

Section: Resultsmentioning

confidence: 99%

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Inter-collisional cutting of multi-walled carbon nanotubes by high-speed agitation

Park

Fujishige

Takeuchi

et al. 2008

Journal of Physics and Chemistry of Solids

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High-speed agitation by a mixing blade has efficiently achieved the cutting of a large diameter (100-150 nm) of multi-walled carbon nanotubes. The cutting process is caused by an inter-collision of the nanotubes with high transfer energy. The collision-induced cutting allows for the shortening of the nanotubes without serious damage of the sidewalls due to the cutting effect being limited to the collision points. Furthermore, the operation under ambient atmosphere introduces oxygen-containing functional groups to the cut nanotubes. The estimated length distribution has indicated that high-speed agitation achieves a large cutting effect during a short duration of several minutes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Inter-collisional cutting of multi-walled carbon nanotubes by high-speed agitation

Park

Fujishige

Takeuchi

et al. 2008

Journal of Physics and Chemistry of Solids

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“…The mean droplet size and the droplet size distribution of the emulsion's dispersed phase were determined using optical particle size analysis methods based on laser diffraction [11]. Laser diffraction spectrometry uses information from a scattered light distribution to determine particle size distributions.…”

Section: Measurement Methodsmentioning

confidence: 99%

Influence of Droplet Size on the Rheological Behavior of Emulsions

Teipel¹

2002

Chem. Eng. Technol.

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This study examined emulsions with two different mean droplet diameters under steady and oscillatory shear flow. The oscillatory experiments yielded results consistent with the steady shear experiments. A nearly constant increase in the complex shear modulus with frequency was observed over a wide range of concentration; as a result the difference in the moduli was nearly constant over the frequency range examined.

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Hydromechanical stress in shake flasks: Correlation for the maximum local energy dissipation rate

Peter

Suzuki

Büchs

2006

Biotech & Bioengineering

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Shake flasks are widely used in biotechnological process research. Bioprocesses for which hydromechanical stress may become the rate controlling parameter include those where oils are applied as carbon sources, biotransformation of compounds with low solubility in the aqueous phase, or processes employing animal, plant, or filamentous microorganisms. In this study, the maximum local energy dissipation rate as the measure for hydromechanical stress is characterized in shake flasks by measuring the maximum stable drop size. The theoretical basis for the method is that the maximum stable drop diameter in a coalescence inhibited liquid/liquid dispersion is only a function of the maximum local energy dissipation rate and not of the dispersing apparatus. The maximum local energy dissipation rate is obtained by comparing the drop diameters in shake flasks to those in a stirred tank reactor. At the same volumetric power consumption, the maximum energy dissipation rate in shake flasks is about 10 times lower than in stirred tank reactors explaining the common observation of considerable differences in the morphology of hydromechanically sensitive cells between these two reactor types. At the same volumetric power consumption, the maximum local energy dissipation rate in baffled and in unbaffled shake flasks is very similar. A correlation is presented to quantify the maximum local energy dissipation rate in shake flasks as a function of the operating conditions. Non-negligible drop viscosity may be considered by known literature correlations. Further, from dispersion experiments a critical Reynolds number of about 60,000 is proposed for turbulent flow in unbaffled shake flasks.

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Problems in Characterizing Transparent Particles by Laser Light Diffraction Spectrometry

Cited by 13 publications

References 4 publications

Inter-collisional cutting of multi-walled carbon nanotubes by high-speed agitation

Inter-collisional cutting of multi-walled carbon nanotubes by high-speed agitation

Influence of Droplet Size on the Rheological Behavior of Emulsions

Hydromechanical stress in shake flasks: Correlation for the maximum local energy dissipation rate

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