Results 231 to 240 of about 24,707 (257)
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Chemical physics of dispersed material surfaces
Reaction Kinetics & Catalysis Letters, 1993Adsorption and chemisorption processes involving hydroxy groups and coordinated water molecules on the surface of silica are discussed on the basis of information derived from infrared spectra, ESCA and thermogravimetric data. The formation of strongly adsorbed surface complexes is described in terms of changes in coordination number of silicon atoms ...
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Chemical Investigation of Disperse Dyes in Patch Test Preparations
Dermatitis, 2007Background: Contact allergy to textile dyes is not uncommon. The allergy is detected by patch testing patients with commercial patch test preparations.Objective: To investigate 8 disperse dyes (DDs) used for patch testing in the departments in Malmö and in Leuven and to compare them with test preparations used at various dermatology departments ...
Kristina, Ryberg +7 more
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Chemical Society Industrial Fellowship on Dispersions
Pigment & Resin Technology, 1980The Process Technology Group of the Chemical Society have recently set up a Research Fellowship to investigate the rheological problems encountered by industry when dealing with dispersions; in particular the prediction of their properties from a knowledge of the nature of the continuous and disperse phases, especially the physical chemistry of the ...
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Rapid Prediction of Chemical Cloud Dispersion from Chemical Spill Accidents
Energy Sources, 1998Responders to spill accidents need to have at their fingertips a method of rapid prediction of chemical cloud dispersion behavior and other relative information to protect the public from death and injury during evacuation of the affected area. A survey of 123 chemical spill accidents in the US where evacuations occurred revealed that available ...
J. NORDIN +4 more
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BIODEGRADATION OF A CHEMICALLY DISPERSED CRUDE OIL
International Oil Spill Conference Proceedings, 1981ABSTRACT The n-alkane fraction of Prudhoe Bay crude oil dispersed with Corexit 9527 disappeared rapidly from the water column directly beneath a seawater surface slick contained by an enclosure. Biodegradation appeared to be more important than nonbiological volatilization or photooxidation processes.
W. J. Cretney +5 more
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A Lagrangian dispersion model with chemical reactions
International Journal of Environment and Pollution, 2011A Lagrangian stochastic (single particle) model is modified in order to account for simple chemistry reactions and tested against measured wind tunnel data. These data refers to a reactive plume generated by a single point source of NO inside a turbulent grid flow doped with ozone.
Alessandrini S, Ferrero E, Belfiore G
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Chemical dispersants: Oil biodegradation friend or foe?
Marine Pollution Bulletin, 2016Chemical dispersants were used in response to the Deepwater Horizon oil spill in the Gulf of Mexico, both at the sea surface and the wellhead. Their effect on oil biodegradation is unclear, as studies showed both inhibition and enhancement. This study addresses the effect of Corexit on oil biodegradation by alkane and/or aromatic degrading bacterial ...
Rahsepar, Shokouhalsadat +4 more
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Chemicals in the Environment, Dispersive Transport
2012Dispersion is the enhanced mixing of material through spatial variations in velocity. When it is of interest (when we are not keeping track of the three-dimensional mixing), dispersion is typically one or two orders of magnitude greater than turbulent diffusion.
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Effect of passive chemical reaction on turbulent dispersion.
AIAA Journal, 1968As the injection velocity increases (decreasing values of m) the thermal layer is blown further away from the wall since T]T = Q(l/Pr m). For a sufficiently small value of m, the thermal layer will be far from the wall where the series expansion for / will not be valid. This value of m is found by rewriting Eq.
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Development of the “Next Generation” Chemical Dispersants
International Oil Spill Conference Proceedings, 1973ABSTRACT In order to fully appreciate the development trend for the “next generation” chemical dispersants for oil spills, the current status of this field is briefly reviewed. Recent applications illustrate the specific beneficial potential role of chemical dispersants in the oil spill control, as well as their limitation.
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