Characterization of ultrafine particles emitted during laser …

2020-12-2 · A fundamental prerequisite for evaluating potential adverse health effects among workers after inhalation of ultrafine particulate matter …

Molecular characterization of ultrafine particles using …

Ultrafine particles (diameter D p < 100 nm) typically comprise the largest fraction of the total number concentration, however, their chemical characterization is difficult because of their low mass. Using an extractive electrospray time-of-flight mass spectrometer (EESI-TOF), we characterize the molecular composition of freshly nucleated ...

Ultrafine metal particles: Journal of Applied Physics: Vol …

2008-8-28 · ABSTRACT. In this paper we present a novel and versatile technique for the production of ultrafine metal particles by evaporation from a temperature‐regulated oven containing a reduced atmosphere of an inert gas. An extensive investigation of particles of oxidized Al, with diameters of 3 to 6 nm, has been performed.

ultrafine particles

"ultrafine particles" – 8。 Translator Translate texts with the world''s best machine translation technology, developed by the creators of …

Ultrafine particles

Ferin J, Oberdörster G, Penney DP. Pulmonary retention of ultrafine and fine particles in rats. Am J Respir Cell Mol Biol. 1992 May; 6 (5):535–542. [Google Scholar] Serita F, Kyono H, Seki Y. Pulmonary clearance and lesions in rats after a single inhalation of ultrafine metallic nickel at dose levels comparable to the threshold limit value.

Ultrafine Particles

2020-12-23 · These particles measure greater than 2.5 μm in diameter, and they are most frequently generated by mechanical processes. fine (≤2.5 μm) and coarse (> 2.5 μm), with UFP a subset of the fine particles. Ultrafine particles can be also referred to as nanoparticles, which include all engineered and ambient nanosized, spherical particles.

Ultrafine particles: unique physicochemical properties …

2020-3-17 · Ultrafine particles (UFPs) are aerosols with an aerodynamic diameter of 0.1 µm (100 nm) or less. There is a growing concern in the public health community about the contribution of UFPs to human ...

High concentration of ultrafine particles in the Amazon …

2020-9-28 · The large concentrations of ultrafine particles consistently observed at high altitudes over the tropics represent one of the world''s largest aerosol reservoirs, which may be providing a globally important source of cloud condensation nuclei. However, the sources and chemical processes contributing to the formation of these particles remain ...

Ultrafine Particles: Geiser et al. Respond | Environmental …

2006-4-1 · The polystyrene particles we used for the studies with the macrophages and erythrocytes were either uncharged, amino-modified, or carboxylate-modified (Rothen-Rutishauser B, Gehr P, Schürch S, unpublished data). The surface charges of the gold and titanium particles are not known. We found non-phagocytic uptake of ultrafine particles of all ...

Air Pollution, Ultrafine Particles, and Your Brain: Are …

Exposure to particulate matter (PM) pollution damages the human brain. Fossil fuel burning for transportation energy accounts for a significant fraction of urban air and climate pollution. While current United States (US) standards limit PM ambient concentrations and emissions, they do not regulate explicitly ultrafine particles (UFP ≤ 100 nm in diameter). There is a growing body of …

Ultrafine particle and production method thereof, …

When the high energy beam is irradiated to at least two neighboring metal ultrafine particles, these metal ultrafine particles are bonded mutually. When the obtained metal ultrafine particle bonded body has a corresponding grain boundary, the high energy beam is further irradiated to lower value Σ of the corresponding grain boundary of the bonded interface.

Ultrafine particles

Ultrafine particles Occup Environ Med. 2001 Mar;58(3):211-6, 199. doi: 10.1136/oem.58.3.211. Authors K Donaldson 1, V Stone, A Clouter, L Renwick, W MacNee. Affiliation 1 Biomedicine Research Group, School ... Particle Size Rats Substances Air Pollutants ...

Formation and growth mechanisms of ultrafine particles in …

2019-9-6 · The ultrafine particles are strongly linked with adverse health effects, including cardiovascular and pulmonary ailments and premature deaths in people with heart or lung disease . For these reasons, UFP air pollution has become a topic of great interest in terms of air quality harm, public health and global climate. Of particular interest, are ...

Health effects of ultrafine particles: a systematic literature …

2019-2-21 · Objectives Due to their small size, ultrafine particles (UFP) are believed to exert higher toxicity than larger particles. As numerous studies on health effects of UFP have been published since the last systematic review in 2013, we aim to systematically review the new literature. Methods We searched MEDLINE and the specialized LUDOK database for studies …

Ultrafine Particles: Characterization, Health Effects and ...

2022-6-2 · An ultrafine particle concentrator would allow controlled exposures of test animals, cell systems in vitro and eventually human subjects to real world urban UP in addition to using surrogate UP. The heads of the five Research Cores constitute the Executive Committee that monitors progress and recommends utilization of resources and coordination ...

(PDF) Ultrafine particles

2001-4-1 · Idealised particles of 10, 1, and 0.1 μm are shown compared with a bronchial epithelium; note that the top end of the range of ultrafine particles …

Ultrafine particles: unique physicochemical properties …

2020-3-17 · Ultrafine particles (UFPs) are aerosols with an aerodynamic diameter of 0.1 µm (100 nm) or less. There is a growing concern in the public health community about the contribution of UFPs to human health. Despite their modest mass and size, they dominate in terms of the number of particles in the ambient air.

Ultrafine particles: unique physicochemical properties …

Ultrafine particles (UFPs) are aerosols with an aerodynamic diameter of 0.1 µm (100 nm) or less. There is a growing concern in the public health community about the contribution of UFPs to human health. Despite their modest mass and size, they dominate in terms of the number of particles in the ambi …

Significant reduction of ultrafine particle emission fluxes to …

2022-6-1 · Ultrafine particles with diameters less than 100 nm suspended in the air are a topic of interest in air quality and climate sciences. Sub-10 nm particles are …

Ultrafine particles altered gut microbial population and …

2021-3-25 · Ultrafine particles from multiple sources are ubiquitous in indoor air, ambient urban air, and the diet and may contribute to many respiratory and cardiovascular effects 63.

Ultrafine Particles Cross Cellular Membranes by …

2005-5-26 · High concentrations of airborne particles have been associated with increased pulmonary and cardiovascular mortality, with indications of a specific toxicologic role for ultrafine particles (UFPs; particles with diameters < 0.1 μm) (Peters et al. 1997).UFPs may induce inflammatory and prothrombotic responses, promoting atherosclerosis, thrombogenesis, and …

Ultrafine particles, and PM2.5 generated from cooking in …

2011-11-1 · The monitored homes all practiced Chinese-style cooking. Cooking elevated the average number concentrations of ultrafine particles (UFPs) and accumulation mode particles (AMPs) by 10 fold from the background level in the living room and by 20–40 fold in the kitchen. PM 2.5 mass concentrations went up to the maximum average of about 160 μg m ...

Mechanisms of ultrafine particle-induced respiratory …

2020-3-17 · The ultrafine particles (UFPs) in air pollution aggravate respiratory illnesses via oxidative stress and inflammation, according to a review by …

Ultrafine particles in cities

2014-5-1 · Ultrafine particles (UFPs; diameter less than 100 nm) are ubiquitous in urban air, and an acknowledged risk to human health.Globally, the major source for urban outdoor UFP concentrations is motor traffic. Ongoing trends towards urbanisation and expansion of road traffic are anticipated to further increase population exposure to UFPs.

Ultrafine Particle

These ultrafine particles have low magnetic properties due to thermal fluctuation, and lower the productivity of sintered compounds especially at the pressing stage. Similarly, particles prepared by the coprecipitation method, hydrothermal synthesis, or by glass crystallization are too small (under 0.1 μm) to

Ultrafine Particles (UFP) in the UK

2018-7-26 · Ultrafine particles (UFP) are defined as those with one dimension less than 100 nanometres. They are therefore the smallest group of particles in the atmosphere and comprise a minor component of PM 2.5 and PM 10. However, although their contribution to particle mass is generally very small, they

Particle surface area, ultrafine particle number …

2022-7-19 · While the health impacts of larger particulate matter, such as PM 10 and PM 2.5, have been studied extensively, research regarding ultrafine particles (UFPs or PM 0.1) and particle surface area concentration (PSC) is lacking.This case-crossover study assessed the associations between exposure to PSC and UFP number concentration (UFPnc) and hospital …

Air pollution ultrafine particles: toxicity beyond the lung

Background: Ultrafine particles or nanoparticles (UFPs or PM0.1) are the fraction of ambient particulates with an aerodynamic diameter smaller than 0.1 microm. Currently UFPs are emerging as the most abundant particulate pollutants in urban and industrial areas, as their exposures have increased dramatically because of anthropogenic sources such as internal combustion …

The pulmonary toxicology of ultrafine particles

Ultrafine particles are a component of air pollution, derived from primary combustion sources, and so we have undertaken a programme of study on the mechanisms of lung injury caused by ultrafine particles. Ultrafine particles made of low-solubility, low-toxicity materials are more inflammogenic in the rat lung than fine respirable, particles ...

Ultrafine Particles in the Atmosphere

Ultrafine particles (less than 0.10 μm in diameter) are ubiquitous in the atmosphere and possess unique physicochemical characteristics that may pose a potential health risk. To help elucidate the potential health risk, we measured respiratory dose of ultrafine particles (0.04, 0.06, 0.08 and 0.10 μm in diameter) in healthy young adults using ...

Ultrafine particles in the urban air: to the respiratory tract

Ultrafine particles in the urban air: to the respiratory tract--and beyond? Ultrafine particles in the urban air: to the respiratory tract--and beyond? Environ Health Perspect. 2002 Aug;110(8):A440-1. doi: 10.1289/ehp.110-1240959. Authors Günter Oberdörster, Mark J Utell. PMID: 12153769 ...