A New Thermophoretic Precipitator for Off‐Line Particle Analysis

Boskovic, Lucija; Agranovski, Igor E.

doi:10.1002/clen.201100173

Cited by 6 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to diffusion and impaction, some particles may have collected in the passages due to residual electrical charge on the particles, although previous experiments with and without an aerosol neutralizer gave negligible differences in penetration measurements. The penetration values reported here are consistent with previous TPS designs (Thayer et al 2011;Boskovic and Agranovski 2012).…”

Section: Resultssupporting

confidence: 91%

“…More contemporary designs tend to employ cylindrical (Rogak et al 1993;Wang et al 2012) or plate-to-plate geometries (Tsai and Lu 1995;Wang et al 2012) with sample analysis by electron microscopy (Rogak et al 1993;Maynard 1995;Bang et al 2003;Lorenzo et al 2007). Size distribution measurements made with thermal precipitators tend to agree well with measurements from scanning mobility particle sizers (Boskovic and Agranovski 2012;Miller et al 2012). Recently, thermal precipitators have been miniaturized so that the sampler is wearable within the breathing zone (Azong-Wara et al 2009Thayer et al 2011).…”

Section: Introductionsupporting

confidence: 53%

See 1 more Smart Citation

Development of a Transfer Function for a Personal, Thermophoretic Nanoparticle Sampler

Leith¹,

Miller-Lionberg²,

Casuccio³

et al. 2013

Aerosol Science and Technology

View full text Add to dashboard Cite

Effective assessment of nanoparticle exposures requires accurate characterization of the aerosol. Of increasing concern is personal exposure to engineered nanoparticles that are specifically designed for use in the nanotechnology sector. This manuscript describes the operation and use of a personal sampler that utilizes thermophoretic force to collect nanoparticles onto a standard TEM (transmission electron microscope) grid. After collection, nanoparticles on the TEM grid are analyzed with an electron microscope, and the resultant data used to determine the characteristics of the nanoparticle aerosol sampled. Laboratory experiments were conducted to determine the inlet losses and collection efficiency of the thermophoretic sampler for particles between 20 and 600 nm in diameter. These results are used together with theory for thermophoretic velocity to form a transfer function that relates the properties of the collected particles to the properties of the sampled aerosol. The transfer function utilizes a normalization factor, F(d), which is larger than unity for very small particles but approaches unity for particles larger than about 70 nm.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Introductionsupporting

confidence: 53%

Development of a Transfer Function for a Personal, Thermophoretic Nanoparticle Sampler

Leith¹,

Miller-Lionberg²,

Casuccio³

et al. 2013

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

“…A subsample of the test aerosol particles were collected with a thermophoretic precipitator (TP) [ Boskovic and Agranovski , ] for analysis by a transmission electron microscope (TEM) equipped with an Energy Dispersive X‐ray (EDX) spectrometer (JEOL 2100) to provide high‐resolution imaging and analysis of the chemical composition of individual particles [e.g., Shi et al ., ]. The TP operation principle is based on passage of an aerosol stream through a narrow slot between hot and cold plates.…”

Section: Methodsmentioning

confidence: 99%

Iron‐rich nanoparticles formed by aeolian abrasion of desert dune sand

Baddock

Boskovic

Strong

et al. 2013

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

[1] Iron-rich nanoparticles in aeolian mineral dust are of considerable importance to biogeochemical cycles. A major determinant of the chemical characteristics of nanoparticles is the parent sediment they are sourced from. The abrasion of dune sand has previously been shown to produce coarse dust (>1 m) during the occurrence of aeolian saltation. In this study, Australian red dune sands were laboratory abraded and emission of particles 18-414 nm was observed throughout the experiment duration ($1 h). The mean size of particles was 130 nm at the start of the test, but this gradually decreased to 110 nm at the end. The number concentration of particles approximately trebled over the course of the experiment with results suggesting that collisions between mobile sand grains led to the production of new nanosized particles over time. Chemical analysis revealed that these nanoparticles were highly abundant in iron, with some aluminium present. This chemical composition suggests that nanoparticles are produced from the clay coatings surrounding the parent sand grains. The study shows that abrasion from saltation occurring in Australian dune sands can release iron-rich nanoparticles, making them available for downwind transport during blowing dust events.

show abstract

Thermophoretic Coating with Molybdenum Oxide Nanoparticles

Boskovic

Agranovski

2012

Chem Eng & Technol

View full text Add to dashboard Cite

Thermophoretic and electrophoretic coatings are the main viable mechanisms for the coating of objects with nanoparticles. Unlike electrophoretic coating, thermophoretic coating has the advantage that electrically conductive substrates are not a requirement. This paper investigates the thermophoretic deposition and uniformity of molybdenum oxide nanoparticles, generated by a glowing wire generator, on various surfaces at three different flow rates (0.3, 1 and 1.5 L min–1). The quantitative evidence of the presence of particles collected by a suggested thermophoretic precipitator at different flow rates has shown that a uniform distribution of the particles could be achieved across the whole area of the precipitator. SEM and TEM micrographs of the film confirmed that a homogeneous densely packed network of molybdenum oxide nanoparticles was built across the precipitation area at the flow rate of 1.5 L min–1.

show abstract

A New Thermophoretic Precipitator for Off‐Line Particle Analysis

Cited by 6 publications

References 13 publications

Development of a Transfer Function for a Personal, Thermophoretic Nanoparticle Sampler

Development of a Transfer Function for a Personal, Thermophoretic Nanoparticle Sampler

Iron‐rich nanoparticles formed by aeolian abrasion of desert dune sand

Thermophoretic Coating with Molybdenum Oxide Nanoparticles

Contact Info

Product

Resources

About