In situ measurement of flame-formed silica particles using dynamic light scattering

Flower, W. L.; Hurd, Alan J.

doi:10.1364/ao.26.002236

Cited by 33 publications

(10 citation statements)

References 9 publications

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“…Numerous investigations of the particulate phase in atmospheric and flame aerosols have been undertaken as a result of the rapid growth of a variety of optical diagnostic techniques (0 ' Alessio, 1981;Scrivner et al 1986;Weill et al, 1986;Flower and Hurd, 1987). Most of these methods require some information about the size distribution of the aerosol particles under investigation, in order to take full advantage of the data obtained experimentally.…”

Section: Introductionmentioning

confidence: 99%

An Integral Solution of the Aerosol Dynamic Equation Including Surface Growth Reactions

Megaridis

Dobbins

1989

GCST

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A mathematical model examining the dynamic behavior of an aerosol undergoing simultaneous particle inception and coagulation or surface growth reactions and coagulation is presented. A bimodal configuration of the distribution function is used to formulate the problem when particle inception mechanisms arc present. Both modes of the distribution are assumed to be of a log-normal form with time varying properties. The model requires knowledge ofthe specific surface growth rate as a function of time, and is potentially applicable for studying aerosols where the surface growth reactions do not coexist with the particle inception mechanisms. The model is used to simulate the time evolution of a soot aerosol inside a flame environment and some important conclusions are drawn related to this problem.

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Section: Introductionmentioning

confidence: 99%

An Integral Solution of the Aerosol Dynamic Equation Including Surface Growth Reactions

Megaridis

Dobbins

1989

GCST

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“…Ein sehr weit verbreitetes Adsorptionsverfahren zur Bestimmung der Oberfläche ist die Methode von B R U - [9] oder als dynamische Lichtstreuung (DLS) [10]. Mit der DLS wird z.…”

Section: Abbildungunclassified

Prozesskontrolle bei der Synthese nanoskaliger Partikel

Sommer¹,

Dankers

Leipertz

2005

Chemie Ingenieur Technik

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Um den Einfluss unterschiedlicher Prozessparameter bei der großtechnischen Nanopartikelsynthese auf die Bildungs‐ und Wachstumskinetik besser verstehen und kontrollieren zu können, ist es notwendig, neben anderen Produkteigenschaften vor allem die Primärpartikelgröße des jeweiligen Stoffsystems online und in situ zu bestimmen. Eine hierfür geeignete Messmethode stellt prinzipiell die zeitaufgelöste laserinduzierte Glühtechnik (TIRE‐LII) dar, deren Anwendbarkeit zur Nanopartikelcharakterisierung an den verschiedensten großtechnischen Produktionsreaktoren aufgezeigt werden soll. Neben der Prozesskontrolle von Industrierußen soll auch das Potenzial der Messtechnik zur Charakterisierung anderer Nanopartikel näher betrachtet und diskutiert werden. Hierfür wurden sowohl Untersuchungen an einem Niederdruckverdampfungs‐ als auch an einem CO2‐Laserverdampfungsreaktor für unterschiedliche Metalle und Metalloxide durchgeführt.

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“…Using ex-situ particle sampling Smirnov et al (Smirnov et al, 2012), for example, analyzed aggregate growth and primary particle size as function of residence time in this type of flame based on transmission electron microscopy (TEM). Other studies in premixed 1-D flames employed in-situ techniques such as dynamic light scattering (Flower and Hurd, 1987;Hurd and Flower, 1988) and angle dependent light scattering (ADLS) (Chang et al, 1998;Ulrich and Riehl, 1982) to characterize silica growth as function of time. In-situ A c c e p t e d M a n u s c r i p t 4 measurements have a clear advantage over ex-situ methods such as TEM in that they obviate the need for intrusive physical sampling.…”

Section: Introductionmentioning

confidence: 99%

Angle-Dependent Light Scattering Study of Silica Aggregate Growth in 1-D Methane/Air Flames with Hexamethyldisiloxane Admixture: Effects of Siloxane Concentration, Flame Temperature, and Equivalence Ratio

Langenkamp

Mokhov

Levinsky

2016

Combustion Science and Technology

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Silica aggregate formation was studied in one-dimensional (1-D) premixed methane/hexamethyldisiloxane/air flames by angle-dependent light scattering measurements for various siloxane concentrations, flame temperatures and equivalence ratios, using Guinier analysis to interpret the experimental data. A sublinear dependence of the aggregate radii of gyration of generated silica particles on residence time, and nonmonotonic dependence on flame temperature with maximum around 2000 K have been observed, with radii of gyration in the range of 10 to 120 nm. Furthermore, a lean flame environment appears to foster aggregate growth compared to rich and stoichiometric flames, in which growth is very similar. When fixing the initial conditions at the residence time corresponding to the first measurement point, a simple model describing particle evolution as a result of collisional growth and sintering predicts the functional dependence of the growth of particle radii well.

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In situ measurement of flame-formed silica particles using dynamic light scattering

Cited by 33 publications

References 9 publications

An Integral Solution of the Aerosol Dynamic Equation Including Surface Growth Reactions

An Integral Solution of the Aerosol Dynamic Equation Including Surface Growth Reactions

Prozesskontrolle bei der Synthese nanoskaliger Partikel

Angle-Dependent Light Scattering Study of Silica Aggregate Growth in 1-D Methane/Air Flames with Hexamethyldisiloxane Admixture: Effects of Siloxane Concentration, Flame Temperature, and Equivalence Ratio

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