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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

Ejection mass specific fractional numbers of released particles; error bars = data spreading of 5 (SGA) and 6–12 (SSC, SMC) repeated measurements
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Fig9: Ejection mass specific fractional numbers of released particles; error bars = data spreading of 5 (SGA) and 6–12 (SSC, SMC) repeated measurements

Mentions: Based on the adjusted aerosol-analytical parameters (volumetric flow rates, dilution ratios) and the recorded PSD0s and PNCs (see Fig. 4), fractional release numbers were determined and related to the ejection mass of the spray units. For the purpose of comparison within this work or with other release studies, it should be noted that the ejection mass of the spray cans comprises in addition to the solid matter also the propellant and the solvent, whereas the ejection mass of the spray gun consists no propellant content. Using only the solid content, the values of the following release data would be 4–10 times higher as specified. Furthermore, due to congruent experimental procedures, it is possible to multiply the ejection mass flows given in Fig 5 a with the corresponding values of the specific release numbers of Fig. 9 to obtain the absolute particle flux, which is also known as particle release rate.Fig. 9


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

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

Ejection mass specific fractional numbers of released particles; error bars = data spreading of 5 (SGA) and 6–12 (SSC, SMC) repeated measurements
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4129227&req=5

Fig9: Ejection mass specific fractional numbers of released particles; error bars = data spreading of 5 (SGA) and 6–12 (SSC, SMC) repeated measurements
Mentions: Based on the adjusted aerosol-analytical parameters (volumetric flow rates, dilution ratios) and the recorded PSD0s and PNCs (see Fig. 4), fractional release numbers were determined and related to the ejection mass of the spray units. For the purpose of comparison within this work or with other release studies, it should be noted that the ejection mass of the spray cans comprises in addition to the solid matter also the propellant and the solvent, whereas the ejection mass of the spray gun consists no propellant content. Using only the solid content, the values of the following release data would be 4–10 times higher as specified. Furthermore, due to congruent experimental procedures, it is possible to multiply the ejection mass flows given in Fig 5 a with the corresponding values of the specific release numbers of Fig. 9 to obtain the absolute particle flux, which is also known as particle release rate.Fig. 9

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