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Granulometric characterization of airborne particulate release during spray application of nanoparticle-doped coatings.

Göhler D, Stintz M - J Nanopart Res (2014)

Bottom Line: Four different types of coatings doped with three kinds of metal-oxide tracer nanoparticle additives (TNPA) were analyzed.The nanoparticulate fraction amounted values between 10 and 60 no%.Isolated ZnO- or Fe2O3-TNPAs could not be observed.

View Article: PubMed Central - PubMed

Affiliation: Research Group Mechanical Process Engineering, Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Münchner Platz 3, 01062 Dresden, Germany.

ABSTRACT
Airborne particle release during the spray application of coatings was analyzed in the nanometre and micrometre size range. In order to represent realistic conditions of domestic and handcraft use, the spray application was performed using two types of commercial propellant spray cans and a manual gravity spray gun. Four different types of coatings doped with three kinds of metal-oxide tracer nanoparticle additives (TNPA) were analyzed. Depending on the used coating and the kind of spray unit, particulate release numbers between 5 × 10(8) and 3 × 10(10) particles per gram ejection mass were determined in the dried spray aerosols. The nanoparticulate fraction amounted values between 10 and 60 no%. The comparison between nanoparticle-doped coatings with non-doped ones showed no TNPA-attributed differences in both the macroscopic spray process characteristics and the particle release numbers. SEM, TEM and EDX-analyzes showed that the spray aerosols were composed of particles made up solely from matrix material and sheathed pigments, fillers and TNPAs. Isolated ZnO- or Fe2O3-TNPAs could not be observed.

No MeSH data available.


Related in: MedlinePlus

Characteristic parameters of the volume-weighted droplet size distribution (PSD3) at a distance of 10 mm from the nozzle exit, determined by laser diffraction analyzes; error bars = spreading of 15 repeated measurements
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Fig6: Characteristic parameters of the volume-weighted droplet size distribution (PSD3) at a distance of 10 mm from the nozzle exit, determined by laser diffraction analyzes; error bars = spreading of 15 repeated measurements

Mentions: Beside the ejection mass flow and the ejection volumetric flow, the volume-weighted droplet size distributions (PSD3) of the spray units were determined in a distance of 10 mm to the spray nozzle outlet by means of a laser diffraction spectrometer (Model HELOS/KR-H2487, Sympatec GmbH, Clausthal-Zellerfeld, Germany) according to ISO 13320:2009. The HELOS was operated with a focal distance of fR3 = 100 mm to cover a size range between 0.9 µm up to 175 µm. The determined density functions of the PSD3 contained the isolated target spray modus/peak of around 25 µm and poorly-reproducible slopes in the density function at the upper and lower size range limits. The coarse droplets (x > 75 µm) have been visually observed before during the spray can analyzes, where they settled down in a distance between 10 and 50 mm from the spray nozzle exit. For the purpose of macroscopic droplet spray aerosol characterization, the target peaks were separated from the whole density function by a band-pass-filter algorithm. Afterward the characteristic parameters as shown in Fig. 6 of the target droplet peak were determined.Fig. 6


Granulometric characterization of airborne particulate release during spray application of nanoparticle-doped coatings.

Göhler D, Stintz M - J Nanopart Res (2014)

Characteristic parameters of the volume-weighted droplet size distribution (PSD3) at a distance of 10 mm from the nozzle exit, determined by laser diffraction analyzes; error bars = spreading of 15 repeated measurements
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4129227&req=5

Fig6: Characteristic parameters of the volume-weighted droplet size distribution (PSD3) at a distance of 10 mm from the nozzle exit, determined by laser diffraction analyzes; error bars = spreading of 15 repeated measurements
Mentions: Beside the ejection mass flow and the ejection volumetric flow, the volume-weighted droplet size distributions (PSD3) of the spray units were determined in a distance of 10 mm to the spray nozzle outlet by means of a laser diffraction spectrometer (Model HELOS/KR-H2487, Sympatec GmbH, Clausthal-Zellerfeld, Germany) according to ISO 13320:2009. The HELOS was operated with a focal distance of fR3 = 100 mm to cover a size range between 0.9 µm up to 175 µm. The determined density functions of the PSD3 contained the isolated target spray modus/peak of around 25 µm and poorly-reproducible slopes in the density function at the upper and lower size range limits. The coarse droplets (x > 75 µm) have been visually observed before during the spray can analyzes, where they settled down in a distance between 10 and 50 mm from the spray nozzle exit. For the purpose of macroscopic droplet spray aerosol characterization, the target peaks were separated from the whole density function by a band-pass-filter algorithm. Afterward the characteristic parameters as shown in Fig. 6 of the target droplet peak were determined.Fig. 6

Bottom Line: Four different types of coatings doped with three kinds of metal-oxide tracer nanoparticle additives (TNPA) were analyzed.The nanoparticulate fraction amounted values between 10 and 60 no%.Isolated ZnO- or Fe2O3-TNPAs could not be observed.

View Article: PubMed Central - PubMed

Affiliation: Research Group Mechanical Process Engineering, Institute of Process Engineering and Environmental Technology, Technische Universität Dresden, Münchner Platz 3, 01062 Dresden, Germany.

ABSTRACT
Airborne particle release during the spray application of coatings was analyzed in the nanometre and micrometre size range. In order to represent realistic conditions of domestic and handcraft use, the spray application was performed using two types of commercial propellant spray cans and a manual gravity spray gun. Four different types of coatings doped with three kinds of metal-oxide tracer nanoparticle additives (TNPA) were analyzed. Depending on the used coating and the kind of spray unit, particulate release numbers between 5 × 10(8) and 3 × 10(10) particles per gram ejection mass were determined in the dried spray aerosols. The nanoparticulate fraction amounted values between 10 and 60 no%. The comparison between nanoparticle-doped coatings with non-doped ones showed no TNPA-attributed differences in both the macroscopic spray process characteristics and the particle release numbers. SEM, TEM and EDX-analyzes showed that the spray aerosols were composed of particles made up solely from matrix material and sheathed pigments, fillers and TNPAs. Isolated ZnO- or Fe2O3-TNPAs could not be observed.

No MeSH data available.


Related in: MedlinePlus