A macrotransport equation for the Hele-Shaw flow of a concentrated suspension

2021 ◽  
Vol 924 ◽  
Author(s):  
Sourojeet Chakraborty ◽  
Arun Ramachandran
Keyword(s):  
Concentrated Suspension

Abstract

Liquid or solid? A biologically inspired concentrated suspension for protective coating

2021 ◽  
pp. 131793
Author(s):  
Yuxuan Wu ◽  
Wenhui Wang ◽  
Junshuo Zhang ◽  
Min Sang ◽  
Yunqi Xu ◽  
...  
Keyword(s):  
Protective Coating ◽  
Biologically Inspired ◽  
Concentrated Suspension

scholarly journals Ultrastructure of the earthworm calciferous gland. A preliminary study

2009 ◽  
Vol 15 (S3) ◽  
pp. 25-26
Author(s):  
J. Méndez ◽  
J. B. Rodríguez ◽  
R. Álvarez-Otero ◽  
M. J. I. Briones ◽  
L. Gago-Duport
Keyword(s):  
Calcium Carbonate ◽  
Crystalline Structure ◽  
Concentrated Suspension ◽  
Earthworm Species ◽  
Preliminary Study

AbstractThe earthworm species belonging to the Lumbricidae family (Annelida, Oligochaeta) posses a complex oesophageal organ known as “calciferous gland” which secretes a concentrated suspension of calcium carbonate. Previous studies have demonstrated the non-crystalline structure of this calcareous fluid representing an interesting example of biomineralisation.

Electrokinetic Research on the Dispersion Behavior of Nano-Ceria Particles in Concentrated Suspensions

2015 ◽  
Vol 645-646 ◽  
pp. 394-399
Author(s):  
Wei Gao ◽  
Qi Long Wei ◽  
Ling Ding ◽  
Xiao Yuan Li ◽  
Chao Wang ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Rheological Properties ◽  
Concentrated Suspensions ◽  
Tem Analysis ◽  
Concentrated Suspension ◽  
Original Solution ◽  
Multi Scale ◽  
Scale Method ◽  
Dispersion Behavior ◽  
Significant Difference

A multi-scale method was developed, which utilized intrinsic relationships among zeta potential of particles, rheological properties of suspensions and particle size distribution (PSD), to analyze dispersion behavior of nanoparticles in concentrated suspensions. It was found that PSD of a kind of nanoceria particles by dynamic light scattering (DLS) method in solution A with concentration 5 wt% accorded well with that by direct TEM analysis, which meant the particles had been dispersed well. However, there had a significant difference when the concentration was increased to 20 wt%. When particles concentration increased from 5 wt% to 20 wt%, zeta potential in solution A changed from-150 mV to-100 mV, while zeta potential in solution B changed from-35mV to-45 mV. Variations of zeta potential of particles accorded well with rheological properties of suspensions too, from phenomenological models. When the suspensions composed by solution A and the nanoparticles with concentration about 20 wt% was diluted with its original solution to 5 wt%, the PSD of nanoceria could be measured indirectly, which accorded well with both that of a suspension prepared directly with near concentration and that from TEM images. Then a method to measure PSD of nanoparticles in concentrated suspension was brought forward.

Biological control over the formation and storage of amorphous calcium carbonate by earthworms

2008 ◽  
Vol 72 (1) ◽  
pp. 227-231 ◽  
Author(s):  
M. J. I. Briones ◽  
E. López ◽  
J. Méndez ◽  
J. B. Rodríguez ◽  
L. Gago-Duport
Keyword(s):  
Electron Microscopy ◽  
Biological Control ◽  
Calcium Carbonate ◽  
Ostwald Ripening ◽  
High Resolution Electron Microscopy ◽  
Amorphous Calcium Carbonate ◽  
Concentrated Suspension ◽  
Selected Area Electron Diffraction ◽  
Resolution Electron ◽  
Glandular Secretion

AbstractThe earthworm calciferous gland produces a concentrated suspension of calcium carbonate and in certain species precipitates as concretions of CaCO3, which then enter the soil. Here we investigated the initial stages of CaCO3 formation in the earthworm Lumbricus friendi by means of Fourier transform infrared and electron microscopy techniques (field-emission scanning electron microscopy, transmission electron microscopy, high resolution electron microscopy and selected area electron diffraction). In addition, comparisons between the IR spectra of the water-dissolved carbonic anhydrase (CA) and the glandular secretion (‘milky fluid’) were performed in order to investigate the mechanisms involved in CaCO3 precipitation. Our results strongly suggest that carbonation starts with the dissolved CO2, which is transformed via deprotonation to HCO3-, then to CO32- and finally to amorphous calcium carbonate (ACC). While ACC stabilization takes place under the biological control, further transformation stages leading to calcite concretions seem to be inorganically driven by an Ostwald ripening process.

Removal of Organochlorine Compounds in an Upflow Flocculated Algae Photobioreactor

1991 ◽  
Vol 24 (5) ◽  
pp. 221-232 ◽  
Author(s):  
Xu Fei Wu ◽  
N. Kosaric
Keyword(s):  
Organic Compounds ◽  
Organochlorine Compounds ◽  
Chlorinated Organic Compounds ◽  
Concentrated Suspension ◽  
Algae Biomass ◽  
Chlorinated Organic ◽  
The Dead

An upflow alum-flocculated algae photobioreactor was investigated for removal of toxic chlorinated organic compounds, chlorobenzene and 2,4-dichlorophenol. Biodegradation was evaluated by monitoring substrate disappearance and concurrent generation of artifacts. Chlorobenzene disappeared faster than 2,4-dichlorophenol. Relative rates of removal were greater by the live than by the dead algae biomass. In this study, gravity-concentrated, suspension-centrifuged, and alum-flocculated algae biomass cultures of Chlorella and Scenedesmus were used. In batch and continuous upflow photobioreactor experiments to treat wastewaters containing 50, 100, 200 (batch), and 1,000 mg/l (continuous) each of chlorobenzene and 2,4-dichlorophenol were applied to the bioreactors individually and also as a mixture. The continuous upflow photobioreactor system was found to be efficient, versatile, adaptable and easy to operate for removal and biodegradation of these organochlorine compounds.

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