FAST COMBUSTION MODES OF COMPOSITES “MOUND OF POROUS SILICON FRAGMENTS - SODIUM PERCHLORATE MONOHYDRATE” IN THE ATMOSPHERE

2021 ◽  
Vol 14 (2) ◽  
pp. 83-91
Author(s):  
V.N. MIRONOV ◽  
◽  
O.G. PENYAZKOV ◽  
E.S. GOLOMAKO ◽  
S.O. SHUMLYAEV ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Porous Layer ◽  
Sodium Perchlorate ◽  
High Energy ◽  
Combustion Dynamics ◽  
Porous Layers ◽  
Combustion Modes ◽  
Series Of Experiments ◽  
Induction Times ◽  
Energy Processes

One of the criteria for the development of high-energy processes is the large specific surface area of the solid component of composites. Therefore, the maximum preservation of its nanostructured skeleton when separating the porous layer from the monocrystal substrate is relevant. Based on the analysis of the quality of the porous layer under various methods and modes of its formation, two methods were selected that provide simple and effective separation of the porous structure from the monocrystal. For composites based on mounds of porous silicon (pSi) fragments (MPSF), three series of experiments were carried out with fragments of porous layers of different age (formed within the previously established time limits before composites creation) with registration of combustion dynamics, temperatures and combustion spectra, as well as intensity of disturbances in the atmosphere forming during combustion of MPSF-composites. Four combustion modes of MPSF-composites were established: smoldering, frontal, aerosol, and frontal-aerosol. The ignition induction times were determined: from 1 to 50 ^s, pressure pulses in the atmosphere at a distance of 260 mm from the ignition site - up to 1.6 bar (with a mass of composites up to 0.4 g). Combustion velocities ofMPSF-composites and their dependences onthe coefficient of stoichiometry and humidity of sodium perchlorate monohydrate are established.

ON THE MECHANISMS OF POROUS SILICON COMBUSTION IN OXYGEN AND AIR ATMOSPHERE WHEN SODIUM PERCHLORATE IS INCORPORATED IN PORES

2020 ◽  
Author(s):  
V. N. MIRONOV ◽  
◽  
O. G. PENYAZKOV ◽  
P. N. KRIVOSHEYEV ◽  
I. A. IVANOV ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Porous Layer ◽  
Sodium Perchlorate ◽  
Spark Ignition ◽  
Joule Heat ◽  
Air Atmosphere ◽  
Breakdown Region ◽  
Ignition And Combustion ◽  
Heating Up

The processes of pSi ignition and combustion in oxygen are described. When spark ignition in the porous layer releases the Joule heat, it leads to a significant heating-up of the breakdown region.

FAST COMBUSTION MODES OF COMPOSITES "MOUND OF POROUS SILICON FRAGMENTS-SODIUM PERCHLORATE MONOHYDRATE" IN THE ATMOSPHERE

2020 ◽  
Author(s):  
V. N. MIRONOV ◽  
◽  
O. G. PENYAZKOV ◽  
E. S. GOLOMAKO ◽  
S. O. SHUMLYAEV ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Energetic Material ◽  
Sodium Perchlorate ◽  
Nanostructured Silicon ◽  
Combustion Modes ◽  
Potential Use

Numerous studies have demonstrated the potential use of porous silicon (pSi) as an energetic material. However, there are a number of dificulties in such an application of nanostructured silicon. Here are two of the most serious dificulties.

Double Sided Porous Silicon on Patterned Substrates for Thermal Effect Microsystems

2000 ◽  
Vol 657 ◽  
Author(s):  
S. Périchon ◽  
V. Lysenko ◽  
B. Remaki ◽  
D. Barbier
Keyword(s):  
Porous Silicon ◽  
Thermal Effect ◽  
Layer Thickness ◽  
Porous Layer ◽  
Silicon Layer ◽  
Current Density Distribution ◽  
Porous Silicon Layer ◽  
Monocrystalline Silicon ◽  
Porous Layers ◽  
Nanocrystallite Size

ABSTRACTApplication of porous silicon in thermal microsystem structures often requires the formation of deep localized porous silicon layers. The most commonly used method to prepare the porous layers is the dc anodic etching of monocrystalline silicon in a hydrofluoric acid (HF) based electrolyte. However inhomogeneity of the nanocrystallite size along the layer depth due to the decrease of HF concentration within the pores as well as the poor uniformity of the porous layer thickness limit the elaboration of deep porous layers. Thus we propose an original pulsed anodisation technique, using a double tank etching cell that allows localized porous silicon layers formation throughout the whole wafer thickness.Furthermore a selective double sided pulsed anodisation of silicon was performed on patterned silicon substrates. Porous silicon is formed in pre-determined parts of the wafer using composite polysilicon-silicon nitride masking layers. Technological solutions to get rid of porous layer thickness inhomogeneity due to non uniform current density distribution are discussed. Finally a toric porous silicon layer, crossing the whole silicon wafer, surrounding a 20 mm diameter monocrystalline silicon cylinder was successfully achieved ensuring a new approach of thermal insulation for thermal effect microsystems.

Quantification of Oxidizer Systems for Porous Silicon Combustion

2015 ◽  
Vol 1758 ◽  
Author(s):  
Ani Abraham ◽  
Nicholas W. Piekiel ◽  
Cory R. Knick ◽  
Christopher J. Morris ◽  
Edward Dreizin
Keyword(s):  
Porous Silicon ◽  
Gas Adsorption ◽  
Energetic Material ◽  
Sodium Perchlorate ◽  
Metal Nitrate ◽  
Etch Depth ◽  
Bomb Calorimetry ◽  
Combustion Dynamics ◽  
Moisture Stability ◽  
On Chip

ABSTRACTWe present the first quantitative assessment of combustion dynamics of on-chip porous silicon (PS) energetic material using sulfur and nitrate-based oxidizers with potential for improved moisture stability and/or minimized environmental impact compared to sodium perchlorate (NaClO4). Material properties of the PS films were characterized using gas adsorption porosimetry, and profilometry to calculate specific surface area, porosity and etch depth. The PS/sulfur energetic composite was formed using three pore loading techniques, where the combustion speeds ranged from 2.9 – 290 m/s. The nitrate-based oxidizers were solution-deposited using different compatible solvents, and depending on the metal-nitrate yielded combustion speeds of 3.1 – 21 m/s. Additionally, the combustion enthalpies from bomb calorimetry experiments are reported for the alternative PS/oxidizer systems in both nitrogen and oxygen environments.

Laser breakdown in crystalline argon as model of fast high-energy processes

1979 ◽  
Vol 9 (1) ◽  
pp. 48-51
Author(s):  
I I Ashmarin ◽  
A I Andreev ◽  
Yu A Bykovskiĭ ◽  
V A Gridin ◽  
Ya Yu Zysin
Keyword(s):  
High Energy ◽  
Laser Breakdown ◽  
Energy Processes

State of the art of particle emissions in thermal spraying and other high energy processes based on metal powders

2021 ◽  
pp. 126952
Author(s):  
G. Darut ◽  
S. Dieu ◽  
B. Schnuriger ◽  
A. Vignes ◽  
M. Morgeneyer ◽  
...  
Keyword(s):  
State Of The Art ◽  
Thermal Spraying ◽  
High Energy ◽  
Metal Powders ◽  
Particle Emissions ◽  
Energy Processes

Thermal Analysis of the Exothermic Reaction between Galvanic Porous Silicon and Sodium Perchlorate

2010 ◽  
Vol 2 (11) ◽  
pp. 2998-3003 ◽  
Author(s):  
Collin R. Becker ◽  
Luke J. Currano ◽  
Wayne A. Churaman ◽  
Conrad R. Stoldt
Keyword(s):  
Thermal Analysis ◽  
Porous Silicon ◽  
Exothermic Reaction ◽  
Sodium Perchlorate

scholarly journals Exponentially damped Breit-Pauli Hamiltonian for the description of positronium decay and other high energy processes

1992 ◽  
Vol 77 (6) ◽  
pp. 1095-1122 ◽  
Author(s):  
Robert J. Buenker
Keyword(s):  
High Energy ◽  
Positronium Decay ◽  
Energy Processes

scholarly journals Porous Silicon Biosensor for the Detection of Bacteria through Their Lysate

Biosensors ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 27
Author(s):  
Roselien Vercauteren ◽  
Audrey Leprince ◽  
Jacques Mahillon ◽  
Laurent A. Francis
Keyword(s):  
Porous Silicon ◽  
Electrochemical Etching ◽  
Bacterial Lysate ◽  
Fast Detection ◽  
Porous Layers ◽  
Deep Blue ◽  
Diffusion Limited ◽  
Colony Forming Units ◽  
Selective Lysis ◽  
Microfabrication Techniques

Porous silicon (PSi) has been widely used as a biosensor in recent years due to its large surface area and its optical properties. Most PSi biosensors consist in close-ended porous layers, and, because of the diffusion-limited infiltration of the analyte, they lack sensitivity and speed of response. In order to overcome these shortcomings, PSi membranes (PSiMs) have been fabricated using electrochemical etching and standard microfabrication techniques. In this work, PSiMs have been used for the optical detection of Bacillus cereus lysate. Before detection, the bacteria are selectively lysed by PlyB221, an endolysin encoded by the bacteriophage Deep-Blue targeting B. cereus. The detection relies on the infiltration of bacterial lysate inside the membrane, which induces a shift of the effective optical thickness. The biosensor was able to detect a B. cereus bacterial lysate, with an initial bacteria concentration of 105 colony forming units per mL (CFU/mL), in only 1 h. This proof-of-concept also illustrates the specificity of the lysis before detection. Not only does this detection platform enable the fast detection of bacteria, but the same technique can be extended to other bacteria using selective lysis, as demonstrated by the detection of Staphylococcus epidermidis, selectively lysed by lysostaphin.

The optimization of porosity and particle size for micron-size porous silicon in high energy pre-lithiated silicon-graphite composite for Li-ion batteries

2022 ◽  
pp. 111672
Author(s):  
Yiteng Luo ◽  
Liwu Huang ◽  
Jianbo Liu ◽  
Zerui Wang ◽  
Qinghao Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Porous Silicon ◽  
High Energy ◽  
Li Ion Batteries ◽  
Graphite Composite ◽  
Micron Size ◽  
Li Ion
Sign in / Sign up

Export Citation Format

Share Document