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Showing 1 to 20 of 91 for “"Particle Formation"”.
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Particle formation in ambient mass spectrometry
A particle sizing system was developed that couples a light scattering particle sizer with a differential mobility analyzer for particle detection and elucidation with the capability for measuring particle sizes in the range of 10 nm to 20 μm. The particle sizing system was used to investigate …
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Organic particle formation in halogen-influenced environments
… and heterogeneous chemistry. Secondary aerosol formation from the reaction of organic trace gases and reactive halogen species can act as an important natural source of organic aerosol. In order to better understand these reactions, aerosol formation from the reaction of α-pinene with chlorine …
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Ion dynamics and aerosol mass spectrometry during atmospheric new particle formation
Eine große Zahl atmosphärischer Aerosolpartikel entsteht durch häufig auftretende sekundäre Neubildungsprozesse. Die aus Vorläufergasen entstehenden Partikel tragen zu einem großen Teil zur Gesamtpartikelanzahl in der Atmosphäre bei und haben somit einen weitreichenden Einfluss auf das Klima. Die …
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Oxy-Coal Combustion: Submicrometer Particle Formation, Mercury Speciation, And Their Capture
… associated with coal combustion, including fine particle, gaseous mercury and heavy metal emissions, need to be established. In addition, the influences of oxy-coal combustion on the performance of the current pollution control technologies, such as an electrostatic precipitator: ESP), need to be …
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Mechanisms of ash particle formation and growth during pulverized coal combustion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1987.
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Fundamental Study of Particle Formation, Transport, Deposition and Filtration for Semiconductor Applications
… EUV lithography system. As a result, the particle size of interest becomes smaller. Preventing and controlling particle contaminations is essential in the semiconductor manufacturing process to increase semiconductor yield. Examples of these unwanted nanoparticles in the semiconductor …
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Ultra-fine particle formation using principle of rapid expansion of supercritical solutions`
… that the reduction in size of a crystalline particle can lead to better performance of the drug compound, particularly for water insoluble drugs, in the final dosage form. Many particle formation techniques have been investigated in recent years by researchers to obtain desired particulate …
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On the phase behavior and particle formation in polyimide/solvent/nonsolvent ternary systems
… and kinetic phenomena involved in the formation of sub-micron polyimide particles from polyimide/solvent/nonsolvent ternary systems were studied. A quantitative equilibrium approach was considered in the B-bonding studies of these ternary systems. The effect of H-bonding on the physical …
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Atmospheric Aerosol Particle Formation : Aircraft-Based Mass Spectrometric Measurements of Gaseous and Ionic Aerosol Precursors
The condensational growth of aerosol particles and the formation of fresh, nanometer-sized particles depend primarily upon the presence of H2SO4. Atmospheric ions produced by cosmic rays can initialize the formation of clusterions, which subsequently may grow by mutual coagulation and condensation …
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Observation of New Particle Formation in the Northern Hemisphere at Altitude from 4 to 20 km
<p>New particle formation (NPF) is investigated using measurements of aerosol size distributions and meteorological variables made in two continents, including USA and Europe. Despite the considerably different aerosol particle abundances among the sites, a common relationship was found between the …
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Synthesis and process optimization of colloidal unimolecular polymer, cup, particle formation, and its interfacial surface tension behavior
<p>"Colloidal Unimolecular Polymer (CUP) particles are 3-9 nm size single-chain polymer nanoparticles that are made from amphiphilic acrylic co-polymers using the process of water reduction. The formation of CUP particles was driven by the polymer-polymer interactions being greater than …
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Sub 2 nm Particle Characterization in Systems with Aerosol Formation and Growth
… frontier is characterizing the initial stages of particle formation by real time measurement of particles below 2 nm in size. Sub 2 nm particles play important roles by acting as seeds for particle growth, ultimately determining the final properties of the generated particles. Tailoring …
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Mechanistic approaches towards understanding particle formation in biopharmaceutical formations. The role of sufactant type and level on protein conformational stability, as assessed by calorimetry, and on protein size stability as assessed by dynamic light scattering, micro flow imaging and HIAC
… the interactions, causes and analysis of particles in order to control protein aggregation to enable successful biopharmaceutical formulations. This work investigates the role of different non-ionic surfactants on protein conformational stability, as assessed by HSDSC, and on protein size …
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Aufklärung des Einflusses von C7 und C8 Aromaten auf die Partikelbildung im Abgas von Ottomotoren mit Direkteinspritzung sowie Entwicklung eines Screeningverfahrens zur Vorhersage der Partikelbildung
With the introduction of direct injection, particle emissions are the main focus of chemical and technical interest. The aim is to contribute to clarifying the influence of specific substance groups and individual components in gasoline on particle formation and, in particular, to identify the …
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Cavitation in Pharmaceutical Manufacturing and Shipping
… recalls have occurred because of sub-visible particle formation resulting from the inherent instability of proteins. It has been suggested that particle formation is associated with late stage processing steps of filling, shipping, and delivery. Previous work at the University of Denver …
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Statistical hadronization phenomenology in heavy ion collisions at SPS and RHIC energies
… and show how it gives a description of particle abundances and spectra through relativistic covariance and entropy maximization. We argue that several statistical hadronization models are possible; In particular, a distinction can be made between equilibrated staged freeze-out in which …
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Post precipitation treatment of copper sulphide particles to improve settleability
In various attempts at producing metal sulphide particles from synthetic solutions, prodigious quantities of nuclei which grow only to colloidal dimensions have been frequently reported. This copious nucleation is promoted by high levels of supersaturation which characterises most precipitation …
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