Aspects of a technique for calculating the Hanel parameters of condensation activity of submicron particles based on the data of an optical counter

2021 ◽  
Author(s):  
Viktor V. Polkin ◽  
SvetlanaTerpugova . Terpugova ◽  
Vladimir . Shmargunov
Keyword(s):  
Submicron Particles ◽  
Condensation Activity

scholarly journals Subpollen particles as atmospheric cloud condensation nuclei

2019 ◽  
Vol 55 (4) ◽  
pp. 64-72
Author(s):  
E. F. Mikhailov ◽  
O. A. Ivanova ◽  
E. Yu. Nebosko ◽  
S. S. Vlasenko ◽  
T. I. Ryshkevich
Keyword(s):  
Atmospheric Aerosol ◽  
Size Range ◽  
Cloud Condensation Nuclei ◽  
Pollen Grains ◽  
Submicron Particles ◽  
Liquid Droplets ◽  
Condensation Nuclei ◽  
Condensation Activity ◽  
Cloud Activation ◽  
Plant Pollen

Bioparticles represent a significant fraction of the total atmospheric aerosol. Their size range varies from nanometers (macromolecules) to hundreds of micrometers (plant pollen, vegetation residues) and like other atmospheric aerosol particles, the degree of involvement of bioaerosols in atmospheric processes largely de- pends on their hygroscopic and cloud condensation nuclei properties. In this paper the ability of the pine, birch and rape subpollen particles to act as cloud condensation nuclei are considered. Submicron particles were obtained by aqueous extraction of biological material from pollen grains and subsequent solidification of the atomized liquid droplets. The parameters of cloud activation are determined in the size range of 20-270 nm in the range of water vapor supersaturations 0.1-1.1%. Based on experimental results, the hygroscopicity parameter, characterizing the effect of the chemical composition of the subparticles on their con- densation properties, is determined. The range of the hygroscopic parameter changes was 0.12-0.13. In general, the results of measurements showed that the condensation activity of the subpollen particles is comparable with the condensation activity of secondary organic aerosols and weakly depends on the type of the primary pollen.

HREM observation of NiO growth on submicron spheres of pure nickel

1989 ◽  
Vol 47 ◽  
pp. 548-549
Author(s):  
C.M. Teng ◽  
T.F. Kelly ◽  
J.P. Zhang ◽  
H.M. Lin ◽  
Y.W. Kim
Keyword(s):  
Nickel Oxide ◽  
Grain Boundaries ◽  
Pure Nickel ◽  
Submicron Particles ◽  
Crystal Formation ◽  
Nickel Wire ◽  
Liquid Droplets ◽  
Oxide Interface ◽  
Nickel Chromium ◽  
Chromium Alloys

Spherical submicron particles of materials produced by electrohydrodynamic (EHD) atomization have been used to study a variety of materials processes including nucleation of alternative crystallization phases in iron-nickel and nickel-chromium alloys, amorphous solidification in submicron droplets of pure metals, and quasi-crystal formation in nickel-chromium alloys. Some experiments on pure nickel, nickel oxide single crystals, the nickel/nickel(II) oxide interface, and grain boundaries in nickel monoxide have been performed by STEM. For these latter studies, HREM is the most direct approach to obtain particle crystal structures at the atomic level. Grain boundaries in nickel oxide have also been investigated by HREM. In this paper, we present preliminary results of HREM observations of NiO growth on submicron spheres of pure nickel.Small particles of pure nickel were prepared by EHD atomization. For the study of pure nickel, 0.5 mm diameter pure nickel wire (99.9975%) is sprayed directly in the EHD process. The liquid droplets solidify in free-flight through a vacuum chamber operated at about 10-7 torr.

scholarly journals Preparation of MCrAlY–Al2O3 Composite Coatings with Enhanced Oxidation Resistance through a Novel Powder Manufacturing Process

2019 ◽  
Vol 28 (3) ◽  
pp. 433-443 ◽  
Author(s):  
Mingwen Bai ◽  
Bo Song ◽  
Liam Reddy ◽  
Tanvir Hussain
Keyword(s):  
Oxidation Resistance ◽  
Manufacturing Process ◽  
Composite Powder ◽  
Composite Coatings ◽  
Submicron Particles ◽  
Second Phase ◽  
Mcraly Coatings ◽  
Powder Feedstock ◽  
Enhanced Oxidation ◽  
Powder Manufacturing

Abstract MCrAlY–Al2O3 composite coatings were prepared by high-velocity oxygen fuel thermal spraying with bespoke composite powder feedstock for high-temperature applications. Powder processing via a suspension route was employed to achieve a fine dispersion of α-Al2O3 submicron particles on the MCrAlY powder surface. This was, however, compromised by ~ 50% less flowability of the feedstock during spraying. Nevertheless, the novel powder manufacturing process introduced in this study has shown potential as an alternative route to prepare tailored composite powder feedstock for the production of metal matrix composites. In addition, the newly developed MCrAlY–Al2O3 composite coatings exhibited superior oxidation resistance, compared to conventional MCrAlY coatings, with the formation of nearly exclusively Al2O3 scale after isothermal oxidation at 900 °C for 10 h. The addition of α-Al2O3 particles in the MCrAlY coatings as a second phase was found to have promoted the formation of YAG oxides (YxAlyOz) during spraying and also accelerated the outwards diffusion of Al, which resulted in enhanced oxidation resistance.

scholarly journals Tribocatalytic degradation of dyes by tungsten bronze ferroelectric Ba2.5Sr2.5Nb8Ta2O30 submicron particles

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13386-13395
Author(s):  
Chaozhong Sun ◽  
Xiaoying Guo ◽  
Changzheng Hu ◽  
Laijun Liu ◽  
Liang Fang ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Dye Degradation ◽  
Tungsten Bronze ◽  
Submicron Particles ◽  
New Approach ◽  
Degradation Of Dyes

Searching for a new approach in environmental remediation in terms of dye degradation is important in industrialized society.

scholarly journals Crystallization Behavior and Mechanical Properties of Poly(ε-caprolactone) Reinforced with Barium Sulfate Submicron Particles

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2368
Author(s):  
Hegoi Amestoy ◽  
Paul Diego ◽  
Emilio Meaurio ◽  
Jone Muñoz ◽  
Jose-Ramon Sarasua
Keyword(s):  
Barium Sulfate ◽  
Thermal Studies ◽  
Polarized Light ◽  
Optical Microscope ◽  
Submicron Particles ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Nucleation Effect ◽  
Crystal Fraction ◽  
Light Optical Microscope

Poly(ε-caprolactone) (PCL) was mixed with submicron particles of barium sulfate to obtain biodegradable radiopaque composites. X-ray images comparing with aluminum samples show that 15 wt.% barium sulfate (BaSO4) is sufficient to present radiopacity. Thermal studies by differential scanning calorimetry (DSC) show a statistically significant increase in PCL degree of crystallinity from 46% to 52% for 25 wt.% BaSO4. Non-isothermal crystallization tests were performed at different cooling rates to evaluate crystallization kinetics. The nucleation effect of BaSO4 was found to change the morphology and quantity of the primary crystals of PCL, which was also corroborated by the use of a polarized light optical microscope (PLOM). These results fit well with Avrami–Ozawa–Jeziorny model and show a secondary crystallization that contributes to an increase in crystal fraction with internal structure reorganization. The addition of barium sulfate particles in composite formulations with PCL improves stiffness but not strength for all compositions due to possible cavitation effects induced by debonding of reinforcement interphase.

Simulation of parameters of submicron particles formed in combustion products of coals

2015 ◽  
Vol 77 (2) ◽  
pp. 165-171 ◽  
Author(s):  
N. M. Kortsenshteyn ◽  
L. N. Lebedeva ◽  
L. V. Petrov ◽  
E. V. Samuilov
Keyword(s):  
Combustion Products ◽  
Submicron Particles

A Facile Fabrication of Fe$_{3}$O$_{4}$/ZnO Core-Shell Submicron Particles With Controlled Size

2011 ◽  
Vol 47 (10) ◽  
pp. 3369-3372 ◽  
Author(s):  
Kyong-Hoon Choi ◽  
Weon-Sik Chae ◽  
Eun-Mee Kim ◽  
Jong-Ho Jun ◽  
Jong-Hyung Jung ◽  
...  
Keyword(s):  
Submicron Particles ◽  
Core Shell ◽  
Facile Fabrication

Formation of submicron particles from the combustion of straw

1995 ◽  
Vol 26 (4) ◽  
pp. 691 ◽  
Author(s):  
Kurt A. Christensen ◽  
Hans Livbjerg
Keyword(s):  
Submicron Particles
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