Deposition of Controllable Nanoparticles by Hybrid Aerodynamic and Electrostatic Spray

NANO ◽  
2017 ◽  
Vol 12 (02) ◽  
pp. 1750023 ◽  
Author(s):  
Baekhoon Seong ◽  
Soohyun Ha ◽  
Hyeong-U Kim ◽  
Cheolmin Shin ◽  
Taesung Kim ◽  
...  
Keyword(s):  
Electric Field ◽  
Aerodynamic Force ◽  
Industrial Applications ◽  
Scanning Mobility Particle Sizer ◽  
Sem Images ◽  
Spray System ◽  
Particle Sizer ◽  
Secondary Breakup ◽  
Electrostatic Spray ◽  
Controllable Particle Size

Generating uniform and size controllable nanoparticles are important for various analytical and industrial applications. Here, we propose the hybrid aerodynamic and electrostatic spray system with a large amount of size-controlled nanoparticles. The aerodynamic force easily produces a large amount of sprayed droplets and the electric field assists in secondary breakup of sprayed droplets. The charge of droplets was evaluated to understand the mechanism of controllable particle size because the size and uniformity of particles are determined by the distributions of droplets after evaporation. The distributions of particles are evaluated with a scanning mobility particle sizer (SMPS) technique and a field emission scanning electron microscope (FE-SEM) images. The size and aggregation of the particles are reduced and controlled by electric field strengths.

Size Distribution of TiO2 Nanoparticles Generated by a Commercial Aerosol Generator for Different Solution Concentrations and Air Flow Rates

2012 ◽  
Vol 727-728 ◽  
pp. 861-866
Author(s):  
João Victor Marques Zoccal ◽  
Fábio de Oliveira Arouca ◽  
José Renato Coury ◽  
José Antônio Silveira Gonçalves
Keyword(s):  
Size Distribution ◽  
Particle Concentration ◽  
Air Flow ◽  
Industrial Applications ◽  
Scanning Mobility Particle Sizer ◽  
Flow Rates ◽  
Nanoscale Particles ◽  
Aerosol Generator ◽  
Particle Sizer ◽  
Number Of Particles

Advances in scientific research in the field of nanotechnology sparked an increase in technological and industrial applications involving nanoparticles, Moreover, there was increasing concern about the control of nanoscale particles released to the atmosphere, driven by concerns over air quality and human health. In this context, this study aims to determine the size distribution of TiO2nanoparticles generated by the commercial TSI Atomizer Aerosol Generator model 3079 for different solution concentrations and air flow rates. The concentrations of the TiO2solutions used in the generator were 0.0125, 0.025 and 0.05 g.L-1, while the aerosol flow rates were 1.27, 2.55 and 3.82 L.min-1. The size distribution was measured with the TSI Scanning Mobility Particle Sizer (SMPS) equipment, which provides the number of particles per size range. The results showed that even changing the concentration of TiO2in solution, peak concentrations of nanoparticles remained in the same range between 15 to 45 nm. Moreover, it was observed that particle concentration in the gas stream decreased with increasing flow rate.

scholarly journals Development and Prospect of UAV-Based Aerial Electrostatic Spray Technology in China

2021 ◽  
Vol 11 (9) ◽  
pp. 4071
Author(s):  
Yali Zhang ◽  
Xinrong Huang ◽  
Yubin Lan ◽  
Linlin Wang ◽  
Xiaoyang Lu ◽  
...  
Keyword(s):  
Plant Protection ◽  
Structure Design ◽  
Research Progress ◽  
Theoretical Simulation ◽  
Spray System ◽  
Charged Droplets ◽  
Agricultural Use ◽  
Field Efficiency ◽  
The Impact ◽  
Electrostatic Spray

Aerial electrostatic spray technology for agriculture is the integration of precision agricultural aviation and electrostatic spray technology. It is one of the research topics that have been paid close attention to by scholars in the field of agricultural aviation. This study summarizes the development of airborne electrostatic spray technology for agricultural use in China, including the early research and exploration of Chinese institutions and researchers in the aspects of nozzle structure design optimization and theoretical simulation. The research progress of UAV-based aerial electrostatic spray technology for agricultural use in China was expounded from the aspects of nozzle modification, technical feasibility study, influencing mechanism of various factors, and field efficiency tests. According to the current development of agricultural UAVs and the characteristics of the farmland environment in China, the UAV-based aerial electrostatic spray technology, which carries the airborne electrostatic spray system on the plant protection UAVs, has a wide potential in the future. At present, the application of UAV-based aerial electrostatic spray technology has yet to be further improved due to several factors, such as the optimization of the test technology for charged droplets, the impact of UAV rotor wind field, comparison study on charging modes, and the lack of technical accumulation in the research of aerial electrostatic spray technology. With the continuous improvement of the research system of agricultural aviation electrostatic spray technology, UAV-based electrostatic spray technology will give play to the advantages in increasing the droplets deposition on the target and reducing environmental pollution from the application of pesticides. This study is capable of providing a reference for the development of the UAV-based agricultural electrostatic spray technology and the spray equipment.

scholarly journals Analyse der Partikelbildung aus der Elektrospray‐Flammensprühpyrolyse mittels Scanning Mobility Particle Sizer

2021 ◽  
Author(s):  
Malte Bierwirth ◽  
Vinzent Olszok ◽  
Varun Aiyar Ganesan ◽  
Jalal Poostforooshan ◽  
Alfred P. Weber
Keyword(s):  
Scanning Mobility Particle Sizer ◽  
Particle Sizer

Zehn Jahre Messungen der Anzahl- und lungendeponierbaren Oberflächenkonzentration ultrafeiner Partikel im städtischen Hintergrund im Ruhrgebiet/Ten years of measurements of the number and lung deposited surface concentration of ultrafine particles in the urban background in the Ruhr Area

Gefahrstoffe ◽  
2020 ◽  
Vol 80 (01-02) ◽  
pp. 25-32
Author(s):  
C. Asbach ◽  
T. A. J. Kuhlbusch ◽  
U. Quass ◽  
H. Kaminski
Keyword(s):  
Surface Area ◽  
Ultrafine Particles ◽  
Surface Concentration ◽  
Scanning Mobility Particle Sizer ◽  
Urban Background ◽  
Ruhr Area ◽  
Nanoparticle Surface ◽  
Particle Sizer

Seit Anfang 2009 werden an einer städtischen Hintergrundmessstation in Mülheim-Styrum im westlichen Ruhrgebiet Anzahlkonzentration, Anzahlgrößenverteilung und lungendeponierbare Oberflächenkonzentration submikroner und ultrafeiner Partikel gemessen. Die dazu eingesetzten Messgeräte Scanning Mobility Particle Sizer (SMPS) und Nanoparticle Surface Area Monitor (NSAM) erwiesen sich als gut geeignet für derartige Messaufgaben. Insbesondere das NSAM ist sehr robust und zuverlässig und wird daher neben der Bestimmung der lungendeponierbaren Oberflächenkonzentration auch zur Funktionsüberwachung des SMPS verwendet. Die ultrafeinen Partikel an der Messstation stammen zu einem großen Teil von einer nahegelegenen Autobahn sowie diversen anderen Quellen in der näheren Umgebung. Der etwa 20 km südlich gelegene Flughafen Düsseldorf scheint keinen merklichen Einfluss zu haben. Eine Auswertung der Wochengänge zeigte überraschenderweise, dass in allen Jahren samstagnachts die im Wochenverlauf höchste Anzahlkonzentration von Partikeln >100 nm gemessen wurde. Während an allen anderen Wochentagen die mittleren Konzentrationen seit 2009 kontinuierlich gesunken sind, blieb die Höhe des Maximums in der Nacht von Samstag auf Sonntag nahezu konstant, was auf eine unveränderte, zeitlich sehr begrenzte Quelle hindeutet.

Ionomer and protein size analysis by analytical ultracentrifugation and electrospray scanning mobility particle sizer

2018 ◽  
Vol 47 (7) ◽  
pp. 777-787 ◽  
Author(s):  
Simon E. Wawra ◽  
Martin Thoma ◽  
Johannes Walter ◽  
Christian Lübbert ◽  
Thaseem Thajudeen ◽  
...  
Keyword(s):  
Analytical Ultracentrifugation ◽  
Size Analysis ◽  
Scanning Mobility Particle Sizer ◽  
Protein Size ◽  
Particle Sizer

scholarly journals Measurement of nonvolatile particle number size distribution

2016 ◽  
Vol 9 (1) ◽  
pp. 103-114 ◽  
Author(s):  
G. I. Gkatzelis ◽  
D. K. Papanastasiou ◽  
K. Florou ◽  
C. Kaltsonoudis ◽  
E. Louvaris ◽  
...  
Keyword(s):  
Size Distribution ◽  
Black Carbon ◽  
Biomass Burning ◽  
Particle Number ◽  
Number Concentration ◽  
Experimental Methodology ◽  
Particle Number Concentration ◽  
Scanning Mobility Particle Sizer ◽  
Number Size Distribution ◽  
Particle Sizer

Abstract. An experimental methodology was developed to measure the nonvolatile particle number concentration using a thermodenuder (TD). The TD was coupled with a high-resolution time-of-flight aerosol mass spectrometer, measuring the chemical composition and mass size distribution of the submicrometer aerosol and a scanning mobility particle sizer (SMPS) that provided the number size distribution of the aerosol in the range from 10 to 500 nm. The method was evaluated with a set of smog chamber experiments and achieved almost complete evaporation (> 98 %) of secondary organic as well as freshly nucleated particles, using a TD temperature of 400 °C and a centerline residence time of 15 s. This experimental approach was applied in a winter field campaign in Athens and provided a direct measurement of number concentration and size distribution for particles emitted from major pollution sources. During periods in which the contribution of biomass burning sources was dominant, more than 80 % of particle number concentration remained after passing through the thermodenuder, suggesting that nearly all biomass burning particles had a nonvolatile core. These remaining particles consisted mostly of black carbon (60 % mass contribution) and organic aerosol (OA; 40 %). Organics that had not evaporated through the TD were mostly biomass burning OA (BBOA) and oxygenated OA (OOA) as determined from AMS source apportionment analysis. For periods during which traffic contribution was dominant 50–60 % of the particles had a nonvolatile core while the rest evaporated at 400 °C. The remaining particle mass consisted mostly of black carbon with an 80 % contribution, while OA was responsible for another 15–20 %. Organics were mostly hydrocarbon-like OA (HOA) and OOA. These results suggest that even at 400 °C some fraction of the OA does not evaporate from particles emitted from common combustion processes, such as biomass burning and car engines, indicating that a fraction of this type of OA is of extremely low volatility.

Distribution of the Electric-Field for an Electrostatic Spray Charging Aircraft

1977 ◽  
Vol 20 (2) ◽  
pp. 0248-0252
Author(s):  
J. B. Carlton ◽  
L. F. Bouse
Keyword(s):  
Electric Field ◽  
Electrostatic Spray

scholarly journals Effects of reformed fuel on dual-fuel combustion particulate morphology

2019 ◽  
pp. 146808741987978
Author(s):  
Flavio Dal Forno Chuahy ◽  
Tyler Strickland ◽  
Nicholas Ryan Walker ◽  
Sage L Kokjohn
Keyword(s):  
Particle Size ◽  
Fuel Combustion ◽  
Dual Fuel ◽  
Scanning Mobility Particle Sizer ◽  
Reactivity Controlled Compression Ignition ◽  
Condensation Particle Counter ◽  
Computational Fluid Dynamics Simulations ◽  
Dual Fuel Combustion ◽  
Particle Sizer ◽  
Dynamics Simulations

Advancements in catalytic reforming have demonstrated the ability to generate syngas (a mixture of CO and hydrogen) from a single hydrocarbon stream. This syngas mixture can then be used to replace diesel fuel and enable dual-fuel combustion strategies. The role of port-fuel injected syngas, composed of equal parts hydrogen and carbon monoxide by volume, was investigated experimentally for soot reduction benefits under diesel pilot ignition and reactivity controlled compression ignition strategies. Particle size distribution measurements were made with a scanning mobility particle sizer and condensation particle counter for different levels of syngas substitution. To explain the experimental results, computational fluid dynamics simulations utilizing a detailed stochastic soot model were used to validate and initialize additional simulations that isolate mixing and chemistry effects. Based on these simulations, the influence of adding syngas on soot particle size and quantity is discussed.

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