نتایج جستجو برای: ultrafine

تعداد نتایج: 4276  

Journal: :Inhalation toxicology 2014
Valérie Forest Mélanie Pailleux Jérémie Pourchez Delphine Boudard Maura Tomatis Bice Fubini Mohamed Sennour Jean-François Hochepied Philippe Grosseau Michèle Cottier

Boehmite (γ-AlOOH) nanoparticles (NPs) are used in a wide range of industrial applications. However, little is known about their potential toxicity. This study aimed at a better understanding of the relationship between the physico-chemical properties of these NPs and their in vitro biological activity. After an extensive physico-chemical characterization, the cytotoxicity, pro-inflammatory res...

Journal: :Nanoscale 2015
Lei Wang Biao Gao Changjian Peng Xiang Peng Jijiang Fu Paul K Chu Kaifu Huo

Silicon-based nanomaterials are promising anode materials in lithium-ion batteries (LIBs) due to their high theoretical capacity of 4200 mA h g(-1), more than 10 times that of commercial graphite. Si nanoparticles (NPs) with a diameter of or below 10 nm generally exhibit enhanced lithium storage properties due to their small size and large surface area. However, it is challenging to generate su...

2016
Tetsuro Hirono Satoru Asayama Shunya Kaneki Akihiro Ito

The criteria for designating an "Active Fault" not only are important for understanding regional tectonics, but also are a paramount issue for assessing the earthquake risk of faults that are near important structures such as nuclear power plants. Here we propose a proxy, based on the preservation of amorphous ultrafine particles, to assess fault activity within the last millennium. X-ray diffr...

2015
Xin Zhang Yan Xu Lian Zhou Chengcheng Zhang Qingtao Meng Shenshen Wu Shizhi Wang Zhen Ding Xiaodong Chen Xiaobo Li Rui Chen Paul B. Tchounwou

Ultrafine aluminum oxide, which are abundant in ambient and involved occupational environments, are associated with neurobehavioral alterations. However, few studies have focused on the effect of sex differences following exposure to environmental Al₂O₃ ultrafine particles. In the present study, male and female mice were exposed to Al₂O₃ nanoparticles (NPs) through a respiratory route. Only the...

2016
N. Gajbhiye A. Vijayalakshmi

Ultrafine particles of SrFelzOts have been synthesized by citrate precursor technique. Solid state reactivity studies of citrate precursor lead to the formation oEfine particles of SrFe12019below 823K.Th.e size and m o r p h o l o g y o c e area measured by BETmethod for5.2nm clystallite is found to be27.45 m2fg. havingparticlesize42nm. UltrafinepaniclesofSrFe~zOlpshows interesting magnetic pro...

Journal: :Environmental pollution 2015
Matteo Reggente Jan Peters Jan Theunis Martine Van Poppel Michael Rademaker Bernard De Baets Prashant Kumar

We propose three estimation strategies (local, remote and mixed) for ultrafine particles (UFP) at three sites in an urban air pollution monitoring network. Estimates are obtained through Gaussian process regression based on concentrations of gaseous pollutants (NOx, O3, CO) and UFP. As local strategy, we use local measurements of gaseous pollutants (local covariates) to estimate UFP at the same...

Journal: :Faraday discussions 2015
Roman Latsuzbaia Emanuela Negro Ger Koper

The design of a synthesis strategy for metal nanoparticles by templating dense microemulsions is proposed. Particle size is controlled by surfactant size rather than by microemulsion composition. The strategy was demonstrated with various systems with different surfactant: cationic, anionic and non-ionic and of different sizes. Formulations were determined using the microemulsion phase diagrams...

Journal: :Journal of the Air & Waste Management Association 2012
P C Albuquerque J F Gomes J C Bordado

The aim of this study was the assessment of exposure to ultrafine in the urban environment ofLisbon, Portugal, due to automobile traffic, and consisted of the determination of deposited alveolar surface area in an avenue leading to the town center during late spring. This study revealed differentiated patterns for weekdays and weekends, which could be related with the fluxes of automobile traff...

Journal: :The Annals of occupational hygiene 2008
Douglas E Evans William A Heitbrink Thomas J Slavin Thomas M Peters

Ultrafine particle number and respirable particle mass concentrations were measured throughout an automotive grey iron foundry during winter, spring and summer using a particle concentration mapping procedure. Substantial temporal and spatial variability was observed in all seasons and attributed, in part, to the batch nature of operations, process emission variability and frequent work interru...

Journal: :The European respiratory journal 2001
P Penttinen K L Timonen P Tiittanen A Mirme J Ruuskanen J Pekkanen

Airborne particles are associated with adverse health effects and contribute to excess mortality in epidemiological studies. A recent hypothesis proposes that the high numbers of ultrafine (<0.1 microm diameter) particles in ambient air might provoke alveolar inflammation and subsequently cause exacerbations in pre-existing cardiopulmonary diseases. To test the hypothesis adult asthmatics were ...

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