Initial stages of silicon anodization in the transition regime: Nanoparticle formation

2005 ◽  
Vol 86 (21) ◽  
pp. 213107 ◽  
Author(s):  
T. Nychyporuk ◽  
V. Lysenko ◽  
B. Gautier ◽  
D. Barbier
Keyword(s):  
Transition Regime ◽  
Nanoparticle Formation ◽  
Silicon Anodization

Silicon nanoparticle formation by short pulse electrochemical etching in the transition regime

2006 ◽  
Vol 100 (10) ◽  
pp. 104307 ◽  
Author(s):  
T. Nychyporuk ◽  
V. Lysenko ◽  
B. Gautier ◽  
D. Barbier
Keyword(s):  
Electrochemical Etching ◽  
Short Pulse ◽  
Transition Regime ◽  
Silicon Nanoparticle ◽  
Nanoparticle Formation

Transport Path in Hydrogenated Microcrystalline Silicon

2002 ◽  
Vol 715 ◽  
Author(s):  
N. Wyrsch ◽  
C. Droz ◽  
L. Feitknecht ◽  
J. Spitznagel ◽  
A. Shah
Keyword(s):  
Raman Spectroscopy ◽  
Volume Fraction ◽  
Conductivity Measurement ◽  
Dark Conductivity ◽  
Transition Regime ◽  
Conductivity Data ◽  
Crystalline Volume Fraction ◽  
Microcrystalline Silicon ◽  
Crystalline Fraction ◽  
Transport Path

AbstractUndoped microcrystalline silicon samples deposited in the transition regime between amorphous and microcrystalline growth have been investigated by dark conductivity measurement and Raman spectroscopy. From the latter, a semi-quantitative crystalline volume fraction Xc of the sample was deduced and correlated with dark conductivity data in order to reveal possible percolation controlled transport. No threshold was observed around the critical crystalline fraction value Xc of 33%, as reported previously, but a threshold in conductivity data was found at Xc≈50%. This threshold is interpreted here speculatively as being the result of postoxidation, and not constituting an actual percolation threshold.

Nanoparticle Formation in Zinc-Ion-Implanated Quartz Upon Oxidation at Elevated Temperatures

2020 ◽  
Vol 14 (5) ◽  
pp. 1072-1080
Author(s):  
V. V. Privezentsev ◽  
A. N. Palagushkin ◽  
V. S. Kulikauskas ◽  
O. S. Zilova ◽  
A. A. Burmistrov ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Zinc Ion ◽  
Nanoparticle Formation

Nonlinear dynamics of pulsating detonation wave with two-stage chemical kinetics in the shock-attached frame

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Yaroslava E. Poroshyna ◽  
Aleksander I. Lopato ◽  
Pavel S. Utkin
Keyword(s):  
Wave Propagation ◽  
Detonation Wave ◽  
Model Comparison ◽  
Approximation Order ◽  
Transition Regime ◽  
Stage Model ◽  
Two Stage ◽  
One Dimensional ◽  
Kinetics Of ◽  
Detonation Wave Propagation

Abstract The paper contributes to the clarification of the mechanism of one-dimensional pulsating detonation wave propagation for the transition regime with two-scale pulsations. For this purpose, a novel numerical algorithm has been developed for the numerical investigation of the gaseous pulsating detonation wave using the two-stage model of kinetics of chemical reactions in the shock-attached frame. The influence of grid resolution, approximation order and the type of rear boundary conditions on the solution has been studied for four main regimes of detonation wave propagation for this model. Comparison of dynamics of pulsations with results of other authors has been carried out.

scholarly journals Structural, Optical and Electrical Properties of Al+MoO3 and Au+MoO3 Thin Films Prepared by Magnetron Codeposition

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 766
Author(s):  
Tihomir Car ◽  
Ivan Jakovac ◽  
Ivana Šarić ◽  
Sigrid Bernstorff ◽  
Maja Micetic
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Au Nanoparticle ◽  
Content Increase ◽  
Optical And Electrical Properties ◽  
Volume Percentage ◽  
Sputtering Deposition ◽  
Nanoparticle Formation ◽  
Al Content ◽  
Sputtering Power

Structural, optical and electrical properties of Al+MoO3 and Au+MoO3 thin films prepared by simultaneous magnetron sputtering deposition were investigated. The influence of MoO3 sputtering power on the Al and Au nanoparticle formation and spatial distribution was explored. We demonstrated the formation of spatially arranged Au nanoparticles in the MoO3 matrix, while Al incorporates in the MoO3 matrix without nanoparticle formation. The dependence of the Au nanoparticle size and arrangement on the MoO3 sputtering power was established. The Al-based films show a decrease of overall absorption with an Al content increase, while the Au-based films have the opposite trend. The transport properties of the investigated films also are completely different. The resistivity of the Al-based films increases with the Al content, while it decreases with the Au content increase. The reason is a different transport mechanism that occurs in the films due to their different structural properties. The choice of the incorporated material (Al or Au) and its volume percentage in the MoO3 matrix enables the design of materials with desirable optical and electrical characteristics for a variety of applications.

Biofuntional nanoparticle formation and folate-targeted antitumor effect of heparin-retinoic acid conjugates

2012 ◽  
Vol 20 (5) ◽  
pp. 520-527 ◽  
Author(s):  
In-hyeok Oh ◽  
Kwang Jae Cho ◽  
Thanh Huyen Tran ◽  
Kang Moo Huh ◽  
Yong-kyu Lee
Keyword(s):  
Retinoic Acid ◽  
Antitumor Effect ◽  
Nanoparticle Formation

scholarly journals Effect of External Charging on Nanoparticle Formation in a Flame

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2891
Author(s):  
Elena Fomenko ◽  
Igor Altman ◽  
Igor E. Agranovski
Keyword(s):  
Negative Ions ◽  
Formation Processes ◽  
Particle Charge ◽  
Mgo Nanoparticles ◽  
Nanoparticle Formation ◽  
Noticeable Change ◽  
Nanoparticle Shape ◽  
Positive Ions ◽  
Direct Interpretation ◽  
Shape Of Nanoparticles

This paper attempts to demonstrate the importance of the nanoparticle charge in the synthesis flame, for the mechanism of their evolution during formation processes. An investigation was made of MgO nanoparticles formed during combustion of magnesium particles. The cubic shape of nanoparticles in an unaffected flame allows for direct interpretation of results on the external flame charging, using a continuous unipolar emission of ions. It was found that the emission of negative ions applied to the flame strongly affects the nanoparticle shape, while the positive ions do not lead to any noticeable change. The demonstrated effect emphasizes the need to take into account all of the phenomena responsible for the particle charge when modeling the nanoparticle formation in flames.

High-speed visualization of metal oxide precursor in multiphase AC arc during nanoparticle formation

2020 ◽  
Vol 59 (SH) ◽  
pp. SHHC08 ◽  
Author(s):  
Manabu Tanaka ◽  
Yuki Saito ◽  
Hiroki Maruyama ◽  
Takayuki Watanabe
Keyword(s):  
Metal Oxide ◽  
High Speed ◽  
Nanoparticle Formation ◽  
Oxide Precursor ◽  
Ac Arc
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