scholarly journals Amorphous Silicon Oxynitride-Based Powders Produced by Spray Pyrolysis from Liquid Organosilicon Compounds

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 386
Author(s):  
Honorata Osip ◽  
Cezary Czosnek ◽  
Jerzy F. Janik ◽  
Jakub Marchewka ◽  
Maciej Sitarz
Keyword(s):  
Spray Pyrolysis ◽  
Particle Morphology ◽  
Point Of View ◽  
Silicon Oxynitride ◽  
Spray Pyrolysis Method ◽  
Process Conditions ◽  
Organosilicon Compounds ◽  
Preparation Methods ◽  
Reactive Medium ◽  
Ar Gas

Silicon oxynitrides (SiOxNy) have many advantageous properties for modern ceramic applications that justify a development of their new and efficient preparation methods. In the paper, we show the possibility of preparing amorphous SiOxNy-based materials from selected liquid organosilicon compounds, methyltrimethoxysilane CH3Si(OCH3)3 and methyltriethoxysilane CH3Si(OC2H5)3, by a convenient spray pyrolysis method. The precursor mist is transported with an inert gas or a mixture of reactive gases through a preheated tube reactor to undergo complex decomposition changes, and the resulting powders are collected in the exhaust filter. The powders are produced in the tube at temperatures of 1200, 1400, and 1600 °C under various gas atmosphere conditions. In the first option, argon Ar gas is used for mist transportation and ammonia NH3 gas serves as a reactive medium, while in the second option nitrogen N2 is exclusively applied. Powder X-Ray Diffraction (XRD) results confirm the highly amorphous nature of all products except those made at 1600 °C in nitrogen. SEM examination shows the spheroidal particle morphology of powders, which is typical for this method. Fourier Transform Infrared (FT-IR) spectroscopy reveals the presence of Si–N and Si–O bonds in the powders prepared under Ar/NH3, whereas those produced under N2 additionally contain Si–C bonds. Raman spectroscopy measurements also support some turbostratic free carbon C in the products prepared under nitrogen. The directly determined O- and N-contents provide additional data linking the process conditions with specific powder composition, especially from the point of view of oxygen replacement in the Si–O moieties formed upon initial precursor decomposition reactions by nitrogen (from NH3 or N2) or carbon (from the carbonization of the organic groups).

scholarly journals Effect of Temperature on Gravity Assisted Synthesis of Carbon Nanotubes by Spray Pyrolysis

2021 ◽  
Vol 33 (5) ◽  
pp. 989-993
Author(s):  
E. Kanagaraj ◽  
P. Mahalingam ◽  
R. Siddharthan ◽  
C. Sathishkumar
Keyword(s):  
Carbon Nanotubes ◽  
Spray Pyrolysis ◽  
Point Of View ◽  
Effect Of Temperature ◽  
Ni Catalyst ◽  
Spray Pyrolysis Method ◽  
Copper Strip ◽  
Multi Walled Carbon Nanotubes ◽  
Synthesis Of Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Carbon nanotubes were prepared along the gravity direction in a spray pyrolysis setup over the silica supported Fe-Co-Ni catalyst. The silica supported Fe-Co-Ni catalyst coated by jet nebulized spray pyrolysis method over copper strip was inverted to face downward, so that carbon nanotubes can be prepared along the direction of gravity. From the point of view of green chemistry, instead of commonly used hydrocarbons, a plant based natural precursor, pine oil is used as carbon precursor for preparation of carbon nanotubes. The effect of temperature on yield and morphology of carbon nanotubes grown along gravity was studied. The yield of carbon nanotubes was calculated as mass percentage of catalyst and support. The carbon nanotubes were characterized using XRD, SEM, Raman and TGA techniques. The carbon deposit obtained at 650 ºC contains multi-walled carbon nanotubes in larger quantity with very less amorphous carbon. A narrow, lengthy and well graphitized multi-walled carbon nanotubes were formed when the carbon nanotubes grow along the gravity.

Fabrication of Hollow (Ni0.8Co0.1Mn0.1) [Ozgur, 2010 #912]Oy Spheres by Ultrasonic Spray Pyrolysis Method

2013 ◽  
Vol 773 ◽  
pp. 580-584
Author(s):  
Kun Tang ◽  
Qing Lin Chen ◽  
Bao Hua Rong ◽  
Xue Wen Liu ◽  
Hua Zhen Yang ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Hollow Structure ◽  
Ultrasonic Spray Pyrolysis ◽  
Particle Morphology ◽  
Solution Concentration ◽  
Lower Solution ◽  
Spray Pyrolysis Method ◽  
Ultrasonic Spray ◽  
Pyrolysis Method ◽  
Ultrasonic Spray Pyrolysis Method

Hollow (Ni0.8Co0.1Mn0.1)Oy spheres were fabricated with ultrasonic spray pyrolysis method. Particle morphology of (Ni0.8Co0.1Mn0.1)Oy was carefully controlled by regulating the concentration of the solution containing mixed sulfates and reaction temperature. Lower solution concentration contributes to cracked hollow structure and higher temperature leads to lager particle size. Crystal phase of precursors was characterized by XRD. Morphology and microstructures of (Ni0.8Co0.1Mn0.1)Oy were observed by SEM and TEM. The results of ultrasonic atomization process show promise properties requirement for commercial applications.

Influence of Sn doping on CO and CO2 sensing of ZnO thin films prepared by spray pyrolysis method

2021 ◽  
Author(s):  
Ashwini S. Varpe ◽  
Mrinalini D. Deshpande
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Zno Thin Films ◽  
Spray Pyrolysis Method ◽  
Sn Doping ◽  
Pyrolysis Method

scholarly journals From Black Box to Machine Learning: A Journey through Membrane Process Modelling

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 574
Author(s):  
Claudia F. Galinha ◽  
João G. Crespo
Keyword(s):  
Machine Learning ◽  
Process Modelling ◽  
Model Membrane ◽  
Point Of View ◽  
Personal Perspective ◽  
Process Conditions ◽  
Monitoring And Control ◽  
Membrane Processes ◽  
Mechanistic Modelling ◽  
Process Monitoring And Control

Membrane processes are complex systems, often comprising several physicochemical phenomena, as well as biological reactions, depending on the systems studied. Therefore, process modelling is a requirement to simulate (and predict) process and membrane performance, to infer about optimal process conditions, to assess fouling development, and ultimately, for process monitoring and control. Despite the actual dissemination of terms such as Machine Learning, the use of such computational tools to model membrane processes was regarded by many in the past as not useful from a scientific point-of-view, not contributing to the understanding of the phenomena involved. Despite the controversy, in the last 25 years, data driven, non-mechanistic modelling is being applied to describe different membrane processes and in the development of new modelling and monitoring approaches. Thus, this work aims at providing a personal perspective of the use of non-mechanistic modelling in membrane processes, reviewing the evolution supported in our own experience, gained as research group working in the field of membrane processes. Additionally, some guidelines are provided for the application of advanced mathematical tools to model membrane processes.

Electrochemical Performance of SOFC Components Fabricated by Spray Pyrolysis Method

2015 ◽  
Vol 68 (1) ◽  
pp. 2479-2490 ◽  
Author(s):  
G. Tsimekas ◽  
E. Papastergiades ◽  
N. E. Kiratzis
Keyword(s):  
Electrochemical Performance ◽  
Spray Pyrolysis ◽  
Spray Pyrolysis Method ◽  
Pyrolysis Method

ChemInform Abstract: The Photovoltaic Properties of Novel Narrow Band Gap Cu2SnS3Films Prepared by a Spray Pyrolysis Method.

ChemInform ◽  
2015 ◽  
Vol 46 (28) ◽  
pp. no-no
Author(s):  
Zhen Jia ◽  
Qinmiao Chen ◽  
Jin Chen ◽  
Tingting Wang ◽  
Zhenqing Li ◽  
...  
Keyword(s):  
Band Gap ◽  
Spray Pyrolysis ◽  
Narrow Band ◽  
Spray Pyrolysis Method ◽  
Photovoltaic Properties ◽  
Pyrolysis Method

scholarly journals Characteristics of nano-sized pb-based glass powders by high temperature spray pyrolysis method

2008 ◽  
Vol 116 (1353) ◽  
pp. 600-604 ◽  
Author(s):  
Jung Sang CHO ◽  
Dae Soo JUNG ◽  
Seung Kwon HONG ◽  
Yun Chan KANG
Keyword(s):  
High Temperature ◽  
Spray Pyrolysis ◽  
Spray Pyrolysis Method ◽  
Pyrolysis Method ◽  
Glass Powders

scholarly journals Synthesis of Silica Particles Using Ultrasonic Spray Pyrolysis Method

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 463
Author(s):  
Srecko Stopic ◽  
Felix Wenz ◽  
Tatjana-Volkov Husovic ◽  
Bernd Friedrich
Keyword(s):  
Spray Pyrolysis ◽  
Sol Gel ◽  
Ultrasonic Spray Pyrolysis ◽  
Silica Particles ◽  
Cement Industry ◽  
Submicron Particles ◽  
Spherical Particles ◽  
Spray Pyrolysis Method ◽  
X Ray ◽  
Ultrasonic Spray

Silica has sparked strong interest in hydrometallurgy, catalysis, the cement industry, and paper coating. The synthesis of silica particles was performed at 900 °C using the ultrasonic spray pyrolysis (USP) method. Ideally, spherical particles are obtained in one horizontal reactor from an aerosol. The controlled synthesis of submicron particles of silica was reached by changing the concentration of precursor solution. The experimentally obtained particles were compared with theoretically calculated values of silica particles. The characterization was performed using a scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS). X-ray diffraction, frequently abbreviated as XRD, was used to analyze the structure of obtained materials. The obtained silica by ultrasonic spray pyrolysis had an amorphous structure. In comparison to other methods such as sol–gel, acidic treatment, thermal decomposition, stirred bead milling, and high-pressure carbonation, the advantage of the ultrasonic spray method for preparation of nanosized silica controlled morphology is the simplicity of setting up individual process segments and changing their configuration, one-step continuous synthesis, and the possibility of synthesizing nanoparticles from various precursors.

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