Modelling the impaction of a micron particle with a powdery layer

2006 ◽  
Vol 168 (3) ◽  
pp. 111-124 ◽  
Author(s):  
M.S. Abd-Elhady ◽  
C.C.M. Rindt ◽  
J.G. Wijers ◽  
A.A. van Steenhoven
Keyword(s):  
Micron Particle

scholarly journals Enhanced Signal-to-Noise and Fast Calibration of Optical Tweezers Using Single Trapping Events

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 570
Author(s):  
Alexander B. Stilgoe ◽  
Declan J. Armstrong ◽  
Halina Rubinsztein-Dunlop
Keyword(s):  
Brownian Motion ◽  
Optical Tweezers ◽  
Optical Trap ◽  
Force Transducer ◽  
Signal To Noise ◽  
Likelihood Estimator ◽  
Micro Fluidics ◽  
Large Numbers ◽  
Force Reconstruction ◽  
Micron Particle

The trap stiffness us the key property in using optical tweezers as a force transducer. Force reconstruction via maximum-likelihood-estimator analysis (FORMA) determines the optical trap stiffness based on estimation of the particle velocity from statistical trajectories. Using a modification of this technique, we determine the trap stiffness for a two micron particle within 2 ms to a precision of ∼10% using camera measurements at 10 kfps with the contribution of pixel noise to the signal being larger the level Brownian motion. This is done by observing a particle fall into an optical trap once at a high stiffness. This type of calibration is attractive, as it avoids the use of a nanopositioning stage, which makes it ideal for systems of large numbers of particles, e.g., micro-fluidics or active matter systems.

Nano-ring arrays for sub-micron particle trapping

2017 ◽  
Author(s):  
Xue Han ◽  
Viet Giang Truong ◽  
Síle Nic Chormaic
Keyword(s):  
Particle Trapping ◽  
Micron Particle

Sub-micron particle delivery using evanescent field

2005 ◽  
Author(s):  
Mojmír Šerý ◽  
Martin Šiler ◽  
Tomáš Čiźmár ◽  
Petr Jákl ◽  
Pavel Zemánek
Keyword(s):  
Evanescent Field ◽  
Micron Particle ◽  
Particle Delivery

Assessment of amentoflavone loaded sub-micron particle preparation using supercritical antisolvent for its antitumor activity

2021 ◽  
Vol 18 ◽  
Author(s):  
Shulei Duan ◽  
Jingfu Jia ◽  
Biao Hong ◽  
Jie Zhou ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Antitumor Activity ◽  
Drug Release ◽  
Spherical Shape ◽  
Inhibitory Effect ◽  
Supercritical Antisolvent ◽  
Micron Particle ◽  
Release Assay ◽  
Particle Preparation ◽  
Release Speed

Introduction: The amentoflavone (AMF) loaded polymeric sub-micron particles were prepared using supercritical antisolvent (SAS) technology with the aim of improving the anticancer activity of AMF. Materials and Methods: Zein and phospholipid mixtures composed of hydrogenated phosphatidylcholine (HPC) and egg lecithin (EPC) were used as carrier materials and, the effects of carrier composition on the product morphology and drug release behavior were investigated. When the mass ratio of Zein/HPC/EPC was 7/2/1, the AMF loaded particles were spherical shape and sub-micron sized around 400 nm, with a drug load of 4.3±0.3 w% and entrapment efficacy of 87.8±1.8%. The in vitro drug release assay showed that adding EPC in the wall materials could improve the dispersion stability of the released AMF in an aqueous medium, and the introduction of HPC could accelerate the drug release speed. Results: MTT assay demonstrated that AMF-loaded micron particles have an improved inhibitory effect on A375 cells, whose IC50 was 37.39μg/ml, compared with that of free AMF(130.2μg/ml). Conclusion: It proved that the AMF loaded sub-micron particles prepared by SAS were a prospective strategy to improve the antitumor activity of AMF, and possibly promote the clinical use of AMF preparations.

Effect of the Mg3N2 Sub-Micron Particle on the Grain Refinement of AZ80 Alloy

2022 ◽  
Vol 327 ◽  
pp. 45-53
Author(s):  
Jiehua Li ◽  
Maria Pammer ◽  
Ernst Neunteufl ◽  
Peter Schumacher
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Liquid State ◽  
High Performance ◽  
Great Loss ◽  
Micron Particle ◽  
Deformation Ability ◽  
Semi Solid ◽  
Az80 Alloy

AZ80 alloy has been widely used to produce high performance Mg casting and wrought parts for high-end applications due to its high mechanical properties and deformation ability. However, at least two important issues still need to be solved in order to further improve its mechanical properties and deformation ability. Firstly, the grain size of α-Mg in AZ80 alloy is relatively large (more than 1000 µm) due to a lack of efficient grain refinement methodologies. Secondly, the size of the eutectic Mg17Al12 phase is also large and the distribution of the eutectic Mg17Al12 phase is continuous, which is very harmful for the mechanical properties, in particular to elongation. In this paper, these two important issues are investigated by adding Mg3N2 sub-micron particle into AZ80 alloy and thereby refining the α-Mg and the eutectic Mg17Al12 phase. Firstly, the Mg3N2 sub-micron particle was directly added into AZ80 alloy by using mechanically stirring in the semi-solid state, subsequently the melting temperature was increased above the liquidous temperature, and finally the melting was casted in the liquid state. It was found that the grain size of α-Mg can be refined from 883.8 µm to 169.9 µm. More importantly, the eutectic Mg17Al12 phase was also refined and the distribution became discontinuous. It should be noted that directly adding the Mg3N2 sub-micron particle into AZ80 alloy leads to a great loss of the Mg3N2 sub-micron particle due to the weak wetting behavior between the Mg3N2 sub-micron particle and Mg melt. The second methodology through mixing Mg3N2 sub-micron particles with AZ91 chips using a twin extruder was also used to prepare AZ91 master alloy with 3wt.% Mg3N2 sub-micron particle, which was subsequently added into AZ80 alloy in the liquid state. In this way, a significant grain refinement of α-Mg and a simultaneous refinement of the eutectic Mg17Al12 phase in AZ80 alloy was also achieved. The grain size of α-Mg can be refined from 883.8 µm to 325.9 µm. However, no significant grain refinement by using UST was observed. Instead, the grain size increases from 325.9 µm to 448.6 µm, indicating that the Mg3N2 sub-micron particle may lose its grain refinement potency due to possible aggregation and clustering. This paper provides an efficient and simple methodology for the grain refinement of α-Mg and the simultaneous refinement of the eutectic Mg17Al12 phase in AZ80 alloy.

Effects of the flue gas treatment of incinerator plants on sub-micron particle concentrations at the stack

2020 ◽  
Vol 101 ◽  
pp. 9-17 ◽  
Author(s):  
L. Stabile ◽  
M. Scungio ◽  
A. Frattolillo ◽  
G. Buonanno
Keyword(s):  
Flue Gas ◽  
Gas Treatment ◽  
Micron Particle ◽  
Flue Gas Treatment

Improving Oil Recovery Using Sub-Micron Particle Gel for Sandstone Reservoirs.

2018 ◽  
Author(s):  
Haifeng Ding ◽  
Ayman Almohsin ◽  
Jiaming Geng ◽  
Baojun Bai
Keyword(s):  
Oil Recovery ◽  
Micron Particle ◽  
Sandstone Reservoirs
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