scholarly journals Particle size distribution measurements of light duty motor vehicle exhaust : evaluating different measurement techniques and vehicle technologies

2002 ◽  
Author(s):  
Kristine Tracey
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Motor Vehicle ◽  
Measurement Techniques ◽  
Vehicle Exhaust ◽  
Light Duty ◽  
Vehicle Technologies

Measurement of soil particle-size distribution by the PARIO measurement system: lessons learned and comparison with two other measurement techniques

2020 ◽  
Author(s):  
Attila Nemes ◽  
Anna Angyal ◽  
Andras Mako ◽  
Jan Erik Jacobsen ◽  
Eszter Herczeg
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Measurement Techniques ◽  
Temperature Shift ◽  
Quantitative Information ◽  
Lessons Learned ◽  
Soil Particle ◽  
Soil Particle Size ◽  
Soil Particle Size Distribution

<p>The PARIO system is a novel technique for the measurement of soil particle-size distribution. It is a computerized sedimentation-based system that will yield a quasi-continuous particle-size distribution curve. Given that it is semi-automated, continuous and sedimentation-based, this system promises to become a good and compatible alternative to the traditional pipette or hydrometer techniques. Through hundreds of measurements we have acquired practical operational knowledge that this poster will share with potential future users. We will also present quantitative information on the technique’s sensitivity to e.g. temperature shift or intermittent vibration during measurement. We also used a set of 45 soil samples of various texture from Norway to compare particle-size distribution measured by the PARIO system, the traditional pipette technique and laser diffractometry. We discuss measurement results as well as related sample-preparation aspects.</p>

Measuring Particulate Emissions of Light Duty Passenger Vehicles Using Integrated Particle Size Distribution (IPSD)

2015 ◽  
Vol 49 (9) ◽  
pp. 5618-5627 ◽  
Author(s):  
David C. Quiros ◽  
Sherry Zhang ◽  
Satya Sardar ◽  
Michael A. Kamboures ◽  
David Eiges ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Particulate Emissions ◽  
Passenger Vehicles ◽  
Light Duty

scholarly journals Particle Size Distribution of Bimodal Silica Nanoparticles: A Comparison of Different Measurement Techniques

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3101
Author(s):  
Mohammed A. Al-Khafaji ◽  
Anikó Gaál ◽  
András Wacha ◽  
Attila Bóta ◽  
Zoltán Varga
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Silica Nanoparticles ◽  
Size Distribution ◽  
Single Particle ◽  
Mathematical Problem ◽  
Measurement Techniques ◽  
Characterization Methods ◽  
Resistive Pulse ◽  
Ill Posed

Silica nanoparticles (SNPs) belong to the most widely produced nanomaterials nowadays. Particle size distribution (PSD) is a key property of SNPs that needs to be accurately determined for a successful application. Many single particle and ensemble characterization methods are available for the determination of the PSD of SNPs, each having different advantages and limitations. Since most preparation protocols for SNPs can yield bimodal or heterogeneous PSDs, the capability of a given method to resolve bimodal PSD is of great importance. In this work, four different methods, namely transmission electron microscopy (TEM), dynamic light scattering (DLS), microfluidic resistive pulse sensing (MRPS) and small-angle X-ray scattering (SAXS) were used to characterize three different, inherently bimodal SNP samples. We found that DLS is unsuitable to resolve bimodal PSDs, while MRPS has proven to be an accurate single-particle size and concentration characterization method, although it is limited to sizes above 50 nm. SAXS was found to be the only method which provided statistically significant description of the bimodal PSDs. However, the analysis of SAXS curves becomes an ill-posed inverse mathematical problem for broad size distributions, therefore the use of orthogonal techniques is required for the reliable description of the PSD of SNPs.

Particle size spectrometer using inertial classification and electrical measurement techniques for real-time monitoring of particle size distribution

Lab on a Chip ◽  
2018 ◽  
Vol 18 (17) ◽  
pp. 2642-2652 ◽  
Author(s):  
Hong-Beom Kwon ◽  
Hong-Lae Kim ◽  
Ui-Seon Hong ◽  
Seong-Jae Yoo ◽  
Kyongtae Kim ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Real Time ◽  
Low Cost ◽  
Measurement Techniques ◽  
Electrical Measurement ◽  
Real Time Monitoring

We present a low-cost and compact particle size spectrometer that can accurately monitor particle size distribution.

scholarly journals Intercomparison of Numerical Inversion Algorithms for Particle Size Determination of Polystyrene Suspensions Using Spectral Turbidimetry

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Benjamin Glasse ◽  
Norbert Riefler ◽  
Udo Fritsching
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Regularization Parameter ◽  
Measurement Techniques ◽  
Particle Diameter ◽  
Ex Situ ◽  
Numerical Inversion ◽  
Particle Size Determination

The continuous monitoring of the particle size distribution in particulate processes with suspensions or emulsions requires measurement techniques that can be used as in situ devices in contrast to ex situ or laboratory methods. In this context, for the evaluation of turbidimetric spectral measurements, the application of different numerical inversion algorithms is investigated with respect to the particle size distribution determination of polystyrene suspensions. A modified regularization concept consisting of a Twomey-Phillips-Regularization with an integrated nonnegative constraint and a modified L-curve criterion for the selection of the regularization parameter is used. The particle size (i.e., particle diameter) of polystyrene suspensions in the rangex=0.03–3 µm was validated via dynamic light scattering and differential centrifugal sedimentation and compared to the retrieved particle size distribution from the inverted turbidimetry measurements.

scholarly journals Comparison of pipette method and state of the art analytical techniques to determine granulometric properties of sediments and soils

2020 ◽  
Vol 69 (1) ◽  
pp. 27-39
Author(s):  
Fruzsina Gresina
Keyword(s):  
Earth Sciences ◽  
Particle Size ◽  
Grain Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Measurement Techniques ◽  
Industrial Applications ◽  
Laser Diffraction ◽  
Cement Industry ◽  
Coarse Grained

The determination of particle size distribution is a crucial issue in various fields of earth sciences (e.g., Quaternary research, sedimentology, stratigraphy, structural geology, volcanology), environmental sciences as well as diverse industrial applications (e.g., pharmaceuticals, cement industry). New measurement techniques developed as a result of industrial demands have also gained ground in environmental and Earth sciences research. The new techniques (especially laser diffraction) have enabled the particle characterisation in the broader size-range with a more detailed resolution. Still, they have to be compared with data obtained by classical methods. In light of the above, the primary aim of our research is to examine the methods of particle size determination critically. Excessive oversimplifications of particle size analyses routinely have used in paleo-environmental and paleo-climatological reconstructions, and other sedimentary studies, as well as insufficient knowledge of the background of the applied methods, distort the interpretation of the results. Over the past four decades, laser diffraction particle size analysers have proven to be practical tools of particle size characterisation. However, the shape of the natural sediment and soil particles are irregular and, therefore, affects the particle size distribution results obtained by different methods. The results of the traditional pipette method differed from laser diffraction results. The presence or absence of the pretreatments did control the differences between the two techniques. The results of Fraunhofer optical method were significantly different from Mie theory because it can detect much lower volume percentages of finer particles. Grain size results of coarse-grained samples measured by different laser diffraction devices were more comparable than the results of more clayey samples. The ratios of different sizes were changed due to the hydrochloric acid and hydrogen peroxide pretreatments. The comparison of different techniques is necessary to revaluate standards in grain size measurements which can enable the shift from conventional methods to more productive and reproducible methods. Still, light scattering techniques have not yet been able to displace classical methods in Earth sciences completely, in contrast to industrial applications.

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