Aerosol generation and measurement of multi-wall carbon nanotubes

Myojo, Toshihiko; Oyabu, Takako; Nishi, Kenichiro; Kadoya, Chikara; Tanaka, Isamu; Ono-Ogasawara, Mariko; Sakae, Hirokazu; Shirai, Tadashi

doi:10.1007/s11051-008-9450-8

Cited by 38 publications

(24 citation statements)

References 17 publications

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“…As can be seen in Figure 5, the aerosol number concentration is stabilized at values close to 10,000 #/cm 3 for periods up to 12 h of continuous operation. In both cases, these numbers are well above those of previously reported aerosol generators based on fluidized bed technology (Prenni et al 2000;Myojo et al 2009;Denny et al 2010;Lind et al 2010). By using a continuous feeding system, generation of highly concentrated aerosols can be achieved over a period of several hours but the average particle size is usually larger than 1 μm (Vincent 2007), a value too large for studies of nanoparticle aerosols.…”

Section: Generation Of Nanoparticle Aerosolssupporting

confidence: 75%

“…Aerosol generation is a less common application but nevertheless fluidized beds have also been used for decades to generate aerosols of relatively coarse particles (Guichard 1976), and more recently for nanoparticles (Wang et al 1998;Yao et al 2002). Myojo et al (2009) reported the use of a fluidized bed to homogenize the supply of multi-walled carbon nanotubes from a rotating brush aerosol generator, giving concentrated carbon nanotube aerosols for limited experimental times (under 1 h of operation). Lind et al (2010) reported on the use of a glass-bead-fluidized bed for producing silica ultrafine particles (1 and 2.6 μm).…”

Section: Introductionmentioning

confidence: 99%

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Fluidized Bed Generation of Stable Silica Nanoparticle Aerosols

Clemente¹,

Balas²,

Lobera³

et al. 2013

Aerosol Science and Technology

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A long-lasting generator of continuous silica nanoparticle aerosols based in a fluidized bed of glass beads coated with nanosized silica has been developed. The attrition resulting from the bubbling fluidized bed regime progressively detaches the silica coating from the glass beads, giving rise to a steady production of silica nanosized aerosols with median diameters from 100 to 250 nm depending on the initial size of the coating nanoparticles. Continuous aerosol production could be maintained for more than 12 h, and the nanoparticle concentration can be easily tuned in the range of 2000 to 14,000 #/cm 3 by adjusting the fluidization and/or dilution flow rates.

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Section: Generation Of Nanoparticle Aerosolssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Fluidized Bed Generation of Stable Silica Nanoparticle Aerosols

Clemente¹,

Balas²,

Lobera³

et al. 2013

Aerosol Science and Technology

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“…The generator RBG-1000 has been used previously to generate a well dispersed carbon nanotube (CNT) aerosol. This dispersion had an average length of 4-6 lm, with 4 mg/m 3 mass concentration at a 2 mm/h feed rate (Myojo et al 2009). One technical limitation of this system is the brush speed which determines the momentum transfer to an aggregate/ agglomerate; this momentum, only once higher than the agglomerate/aggregate bond strength may break it into smaller pieces or its individual constituents.…”

Section: Discussionmentioning

confidence: 99%

Limited inflammatory response in rats after acute exposure to a silicon carbide nanoaerosol

et al. 2015

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Inhalation represents the major route of human exposure to manufactured nanomaterials (NMs). Assessments are needed about the potential risks of NMs from inhalation on different tissues and organs, especially the respiratory tract. The aim of this limited study is to determine the potential acute pulmonary toxicity in rats exposed to a dry nanoaerosol of silicon carbide (SiC) nanoparticles (NPs) in a whole-body exposure (WBE) model. The SiC nanoaerosol is composed of a bimodal size distribution of 92.8 and 480 nm. The exposure concentration was 4.91 mg/L, close to the highest recommended concentration of 5 mg/L by the Organisation for Economic Co-operation and Development. Rats were exposed for 6 h to a stable and reproducible SiC nanoaerosol under real-time measurement conditions. A control group was exposed to the filtered air used to create the nanoaerosol. Animals were sacrificed immediately, 24 or 72 h after exposure. The bronchoalveolar lavage fluid from rat lungs was recovered. Macrophages filled with SiC NPs were observed in the rat lungs. The greatest load of SiC and macrophages filled with SiC were observed on the rat lungs sacrificed 24 h after acute exposure. A limited acute inflammatory response was found up to 24 h after exposure characterized by a lactate dehydrogenase and total protein increase or presence of inflammatory cells in pulmonary lavage. For this study a WBE model has been developed, it allows the simultaneous exposure of six rats to a nanoaerosol and six rats to clean-filtered air. The nanoaerosol was generated using a rotating brush system (RBG-1000) and analyzed with an electrical low pressure impactor in real time.J. Laloy and O. Lozano have contributed equally in the study reported here.Electronic supplementary material The online version of this article (

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“…Recently, Baron et al (2008) generated aerosolized single-walled CNT (SWCNT) for inhalation study using mill and cyclone generator. Myojo et al (2009) also used a rotating brush aerosol generator and they controlled the number concentration of multiwalled CNT (MWCNT) aerosol up to 20,000 particles cm -3 . They succeeded in aerosolizing commercial MWCNT powder for an exposure study of mice, but the size distribution of generated test particles was too broad and filtration efficiency of these aerosols was not investigated.…”

Section: Introductionmentioning

confidence: 99%

Filtration of Multi-Walled Carbon Nanotube Aerosol by Fibrous Filters

Seto¹,

Furukawa²,

Ōtani³

et al. 2010

Aerosol Science and Technology

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Filtration efficiency of multi-walled carbon nanotube (MWCNT) aerosol by fibrous filter was evaluated experimentally. Mono-mobility test aerosols with electrical mobility diameter of 100, 200, and 300 nm were generated by the atomization of MWCNT aqueous suspension followed by mobility classification with a differential mobility analyzer (DMA). By analyzing the shape of classified aerosol particles under a scanning electron microscope, it was found that the DMA-classified 300 nm particles were fibrous in shape and had uniform diameter of about 60 nm and length of 2.1 micrometer. On the other hand, 100 nm and 200 nm particles contained a fairly large amount of multiply charged fibrous particles with a larger diameter. These test aerosols were challenged to a medium performance fibrous filter at various filtration velocities. As a result, fibrous particles were captured by fibrous filter at a higher collection efficiency than the spherical particles with the same mobility. By analyzing the single fiber capturing efficiency, interception incorporating the rotation of fibrous particles is found to be the dominant capturing mechanism for the fibrous particles in the studied size range.

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Aerosol generation and measurement of multi-wall carbon nanotubes

Cited by 38 publications

References 17 publications

Fluidized Bed Generation of Stable Silica Nanoparticle Aerosols

Fluidized Bed Generation of Stable Silica Nanoparticle Aerosols

Limited inflammatory response in rats after acute exposure to a silicon carbide nanoaerosol

Filtration of Multi-Walled Carbon Nanotube Aerosol by Fibrous Filters

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