Search results for "LIGHT-SCATTERING"

showing 2 items of 12 documents

Quasi-isoactinic reactor for photocatalytic kinetics studies

2007

Photochemical reactors characterized by almost uniform values of the local volumetric rate of photon absorption (LVRPA), i.e., quasi-isoactinic photoreactors, are particularly suitable for assessing the influence of radiant field intensity in kinetic studies. In this work, Monte Carlo simulations have been performed to obtain LVRPA values in a flat photoreactor irradiated on both sides. This configuration appears to be particularly suitable for obtaining quasi-isoactinic conditions. The influence of catalyst albedo and scattering phase function is assessed, and the conditions for obtaining iso-actinicity are discussed. Finally, these conditions are related to an easy-to-measure parameter, n…

Work (thermodynamics)Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciGeneral Chemical EngineeringSettore ING-IND/25 - Impianti ChimiciMonte Carlo methodThermodynamicsPhotochemical reactorParticleKinetic energyIndustrial and Manufacturing EngineeringLight scatteringRadiation absorptionOpticsTransmittanceAbsorption (electromagnetic radiation)Heterogeneous photoreactorRadiant fieldChemistrybusiness.industryScatteringWaterGeneral ChemistryPhotocatalysisLight-scatteringAstrophysics::Earth and Planetary AstrophysicsbusinessModel
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Polymer-induced phase separation in suspensions of bacteria

2010

We study phase separation in suspensions of two unrelated species of rod-like bacteria, Escherichia coli and Sinorhizobium meliloti, induced by the addition of two different anionic polyelectrolytes, sodium polystyrene sulfonate or succinoglycan, the former being synthetic and the latter of natural origin. Comparison with the known behaviour of synthetic colloid-polymer mixtures and with simulations show that "depletion" (or, equivalently, "macromolecular crowding") is the dominant mechanism: exclusion of the non-adsorbing polymer from the region between two neighbouring bacteria creates an unbalanced osmotic force pushing them together. The implications of our results for understanding phe…

chemistry.chemical_classificationSinorhizobium melilotiADSORPTIONbiologyBiofilmMIXTURESfood and beveragesGeneral Physics and AstronomyPolymerAGGREGATIONbiology.organism_classificationmedicine.disease_causeLIGHT-SCATTERINGSUCCINOGLYCANPolyelectrolytechemistryESCHERICHIA-COLImedicineBiophysicsMacromolecular crowdingSodium Polystyrene SulfonateEscherichia coliBEHAVIORBacteriaEPL (Europhysics Letters)
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