particle size distribution measurement Articles
-
Potential for metal contamination by direct sonication of nanoparticle suspensions
While conducting toxicity tests with nano titanium dioxide, the authors found that test suspensions were being contaminated with aluminum and titanium from tip erosion during direct sonication. The contaminating alloy particles had a measurable size distribution and zeta potential using dynamic light scattering, which changed the measured characteristics of the suspensions. Caution should be ...
-
Modified log-normal particle size distribution in acoustic spectroscopy
The modified log-normal distribution is a smooth continuous distribution depending on four parameters: median size, standard deviation, minimum size and maximum size. This distribution introduced by Kottler [J. Franklin Inst. 250 (1950) 339] and Irani [J. Phys. Chem. 63 (1959) 1603] gives an opportunity to restrict the particle size range. This distribution is asymmetrical on the logarithmic ...
-
Urban indoor-outdoor aerosol measurements in Portugal and the global warming scenario
Aerosols play a major role both in climate change and air quality. They affect climate by interfering with radiative transfer and the atmospheric temperature. Aerosol particulate matter has also been associated with various adverse health effects. Aerosol particles' number and size distributions were measured inside and outside the houses in the urban areas of Evora and Lisbon in Portugal. The ...
-
Seasonal size distributions of suspended solids in a stormwater management pond
ABSTRACTThree seasonal surveys of suspended solids were carried out in an on-stream stormwater management pond, by means of a submersible laser particle size analyser. Size distributions were measured at up to 17 points in the pond, and water samples collected at the same locations were analysed for primary particles aggregated in flocs. Observed suspended solids were mostly composed of flocs, ...
-
Test of precoat filtration technology for treatment of swimming pool water
The technical performance of a precoat filter was compared with that of a traditional sand filter. Particle concentration and size distribution were measured before and after the filtration of swimming pool water. Both the sand and precoat filters could reduce the particle concentration in the effluent. However, higher particle removal efficiency was generally observed for the precoat filter, ...
-
Acoustic and Electroacoustic Spectroscopy of Water-in-Diluted-Bitumen Emulsions
Water-in-oil emulsions of Athabasca bitumen diluted with toluene have been studied using the latest advances in acoustic and electroacoustic spectroscopy. From the sound attenuation spectra of emulsions, the water droplet size distribution is measured. The electrical surface charge density of the water droplets is obtained from the colloid vibration current. In the case of freshly prepared ...
-
Laser Diffraction
Particle size measurement using static light scattering The particle size distribution as a parameter to specify a powder or dispersion plays a central role in many applications. Examples are construction material (sands, cements), pharmaceutical development, lime stones, ceramics, colored pigments, fertilizers, emulsions and may more. The range of applications is increasing permanently and hence ...
-
Laser Diffraction
Particle size measurement using static light scattering The particle size distribution laser diffraction as a parameter to specify a powder or dispersion plays a central role in many applications. Examples are construction material (sands, cements), pharmaceutical development, lime stones, ceramics, colored pigments, fertilizers, emulsions and may more. The range of applications is increasing ...
-
Some practical experience on fine dust emission monitoring. A comparison of results, using different types of equipment.
Summary Different particle sizing sampling equipment is compared. Measurements were carried out with a Johnas, an Andersen cascade impactor and a PM10 separator monted on a Tecora. The results were compared with each other and with the results of dust concentrations measured with a Tecora in accordance with ISO 9096. Measurements were performed at different sources; with different kinds of dust ...
-
The Helmholtz Virtual Institute of Complex Molecular Systems in Environmental Health consortium (HICE) - Case Study
Venacontra delivered Diluting Aerosol Sampler (DAS) during the year 2012 for the HICE – The Helmholtz Virtual Institute of Complex Molecular Systems in Environmental Health consortium. DAS has been succesfully used in various HICE measurement campaigns including the following combustion sources: marine applications with heavy fuel oil and marine gas oil vehicle emissions small ...
By Venacontra
-
Dust Monitoring for Air Purification - Case Study
Overview Heavy welding, metal cutting, and buffing activities inside the JCB manufacturing plant of India generate high amounts of Particulate Matters of 2.5 microns (PM2.5) & 10 microns(PM10) (exceeding 300 ug/m3). The situation demanded air quality monitoring and suppression of pollutants. Oizom deployed Dustroid to monitor real-time dust particle generation within the facility. Dustroid ...
-
On measurement of particle size distribution of sub 5 nm aerosol particles
Nano particles have been sized based on their electrical mobility. This is not efficient because most of the nano particles are electrically neutral. Measuring the particle size distribution typically consist of detecting size selected particles with an aerosol particle detector such as Condensation Particle Counter (CPC). This is also the working principle of Scanning Mobility Particle Sizer. ...
By Airmodus Oy
-
Assessment of particulates in the urban atmosphere of Sao Carlos, Brazil
A survey on the concentration of particulate matter in the urban atmosphere was carried out in the city of Sao Carlos, Brazil. Five sites were selected for data collection one in the city centre (high concentration of people and automotive vehicles), three in industrial areas, and one at the interface with the countryside. The particle size distribution and mass concentration, temperature, ...
-
Monitoring nanoparticles in the presence of larger particles in liquids using acoustics and electron microscopy
Monitoring the presence of nanoparticles in dispersions having broad particle size distributions can be a problem for many measurement techniques because large particles or even aggregates of the smaller particles can mask the presence of the sought after nanoparticles. The ability of many existing techniques to detect the nanoparticles when present in broad polydisperse systems is largely ...
-
Monitor for detecting and assessing exposure to airborne nanoparticles
Abstract An important safety aspect of the workplace environment concerns the severity of its air pollution with nanoparticles (NP; \100 nm) and ultrafine particles (UFP; \300 nm). Depending on their size and chemical nature, exposure to these particles through inhalation can be hazardous because of their intrinsic ability to deposit in the deep lung regions and the possibility to subsequently ...
By Oxility BV
-
The PSM 2.0: A Game-Changer in Measuring Cluster and Nucleation Mode Particles
How Airmodus revolutionized nanoparticle science with the PSM Airmodus Ltd. was originally established to bring to life a groundbreaking invention – the first-ever Particle Size Magnifier (PSM) capable of seamless 24/7 operation. In 2010, we pioneered continuous measurements of the smallest particle clusters across diverse environments, a landmark achievement that propelled scientific ...
By Airmodus Oy
-
Characterization of particulate matter and gaseous emissions of a C-130H aircraft
The gaseous and nonvolatile particulate matter (PM) emissions of two T56-A-15 turboprop engines of a C-130H aircraft stationed at the 123rd Airlift Wing in the Kentucky Air National Guard were characterized. The emissions campaign supports the Strategic Environmental Research and Development Program (SERDP) project WP-1401 to determine emissions factors from military aircraft. The purpose of ...
-
A large source of cloud condensation nuclei from new particle formation in the tropics
Cloud condensation nuclei (CCN) can affect cloud properties and therefore Earth’s radiative balance1–3. New particle formation (NPF) from condensable vapours in the free troposphere has been suggested to contribute to CCN, especially in remote, pristine atmospheric regions4, but direct evidence is sparse, and the magnitude of this contribution is uncertain5–7 . Here we use ...
-
Supercooled Liquid Water is Hazardous to Your Health!
What is Supercooled Liquid Water? Supercooled Liquid Water (SLW) refers to water droplets in a cloud that can stay in a liquid state at below freezing temperatures. If an airplane flies into these SLW droplets, icing on the wings and airframe can occur. SLW droplets larger than 30 microns create the biggest hazard for aircraft because they don’t freeze immediately, allowing them to ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you