Low-Cost Combustion Synthesis, Spectroscopic and Optoelectronic Analysis of Novel Ba2YAlO5:Er3+ Nanomaterials for Competent Illumination Applications

2021 ◽  
pp. 1-8
Author(s):  
Priyanka Sehrawat ◽  
Rajesh Kumar Malik ◽  
Rajesh Punia ◽  
Monika Sheoran ◽  
Manisha Bedi ◽  
...  
Keyword(s):  
Combustion Synthesis ◽  
Low Cost

scholarly journals Nb2O5 nanoparticles obtained by microwave assisted combustion synthesis under different conditions

2021 ◽  
Vol 15 (2) ◽  
pp. 128-135
Author(s):  
Thaís Luiz ◽  
Fabio Nakagomi ◽  
Reny Renzetti ◽  
Guilherme Siqueira
Keyword(s):  
Combustion Synthesis ◽  
Diffuse Reflectance Spectroscopy ◽  
Low Cost ◽  
Synthesis Method ◽  
Particle Growth ◽  
Synthesis Temperature ◽  
Band Gap Energy ◽  
Stoichiometric Ratio ◽  
Synthesis Of Nanoparticles ◽  
Microwave Assisted

The microwave assisted combustion synthesis (MACS) as a new, quick and low cost synthesis method was used for preparation of niobium pentoxide (Nb2O5) powders. The present paper investigated the effect of reactant concentrations (ammonium niobium oxalate, urea and ammonium nitrate) on the characteristics of Nb2O5 nanoparticles. Three samples were synthesized with stoichiometric ratio between the fuel and oxidant (C1), excess of oxidant (C2) and excess of fuel (C3). In all samples, Nb2O5 crystalline nanoparticles with irregular morphology were detected. The synthesis of nanoparticles with smaller diameter in the C2 and C3 samples was confirmed by greater values of band gap energy measured through UV-Visible diffuse reflectance spectroscopy (indicating quantum confinement) and by the Rietveld refinement of X-ray diffraction patterns. The results showed that the amounts of oxidant and fuel can change synthesis temperature, influencing the final characteristics of the particles, such as size and existent phases. In these cases the excess of oxidant and fuel in the C2 and C3 samples, respectively, decreases the average synthesis temperature and decelerates the particle growth and the formation of the monoclinic phase.

Influence of Nitrogen Pressure and TiN Addition on Combustion Synthesis of Ti2AlN Powders

2012 ◽  
Vol 624 ◽  
pp. 5-8
Author(s):  
Jia Jin Tian ◽  
Feng Rui Zhai ◽  
Li Li Zhang ◽  
Hong Wei Zhang ◽  
Zhong Zhou Yi
Keyword(s):  
Combustion Synthesis ◽  
Raw Materials ◽  
Low Cost ◽  
Synthesis Method ◽  
Nitrogen Compound ◽  
Combustion Method ◽  
Nitrogen Pressure ◽  
Small Sample ◽  
Optimum Process ◽  
Xrd Diffraction

It has a relatively rapid reaction with self-propagating combustion method to synthesize Ti-Al-N powder. This can effectively avoid uneven phenomenon of aluminum melting reunion during the reaction of raw materials. So you can use lower-cost aluminum as raw materials. In addition, the combustion synthesis method also has a simple process and low-cost advantage. Thus this method has the potential to become the optimum process method to prepare Ti2AlN and Ti4AlN3. In this paper, Ti, Al elemental powders and N2 were used as raw materials. The powder of Ti2AlN was successfully prepared for the first time by combustion synthesis method. This substance is a nitrogen compound of single-phase and three yuan. The results from the XRD diffraction analysis and SEM show that synthetic product is high purity Ti2AlN with a small sample to combustion synthesis when the pressure of nitrogen is in 5 MPa, but the content of synthesis products Ti2AlN is small when the sample is magnified, and the TiN and AlN has a higher content. It can burn synthetic Ti2AlN to control the nitrogen pressure and add the amount of TiN, and the pressure of N2 is better 2 MPa, and the amount of TiN added is better 30 wt.%.

Combustion Synthesis of TiNx C1-x Powders with Ultra Fine Particle Size by Using Titanium Oxide as Dilution

2007 ◽  
Vol 280-283 ◽  
pp. 1429-1432
Author(s):  
Ke Gang Ren ◽  
Ke Xin Chen ◽  
G.H. Liu ◽  
Hai Bo Jin ◽  
Xiao Shan Ning ◽  
...  
Keyword(s):  
Particle Size ◽  
Combustion Synthesis ◽  
Fine Particle ◽  
Single Phase ◽  
Low Cost ◽  
Fine Particle Size ◽  
Ultra Fine Particle ◽  
Titanium Powders ◽  
Tio2 Addition ◽  
Combustion Synthesis Reaction

In present works, the low cost TiO2 powders were partially introduced to raw mixture as playing roles of both reactant and dilution. The experimental results showed that increasing the ratio of TiO2 to titanium powders up to 70wt%, the combustion synthesis reaction could still proceed by self-sustained mode. Single phase of TiNxC1-x with ultra fine particle size could be prepared by using TiO2 as dilution. Influences of TiO2 addition on phase formation and microstructure of product were also investigated. It was found that the combustion temperature and as-synthesized TiNxC1-x particle size decreased as increasing the amount of TiO2 addition.

Development of Nanostructured EuAl2O4 Phosphors with Strong Long-UV Excitation

2008 ◽  
Vol 8 (12) ◽  
pp. 6461-6465 ◽  
Author(s):  
Gustavo A. Hirata ◽  
Eric J. Bosze ◽  
Joanna McKittrick
Keyword(s):  
Solid State ◽  
Combustion Synthesis ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Orthorhombic Phase ◽  
Excitation Wavelength ◽  
Strong Excitation ◽  
Pressurized Combustion ◽  
Low Pressures

Fueled by the need to develop novel materials for applications in solid state white-emitting lamps we have improved a new low-cost, clean and efficient technique to produce high luminescence phosphors with strong excitation in the long-UV range (350–400 nm) which makes them useful for applications in GaN-based solid state lamps. In this work, pressurized combustion synthesis has been successfully used to develop EuAl2O4 (europium aluminate), a new green photoluminescent material with monoclinic structure. The combustion synthesis reaction conditions can be adjusted to produce either the AlEuO3 orthorhombic phase at low pressures (0.1 MPa), or the new monoclinic EuAl2O4 phase, which is apparently more thermodynamically favorable at higher combustion reaction pressures (1.4 MPa). The luminescent material is a high surface area powder (∼50 m2/g) composed mainly of nanostructured needles and plates with 5–10 nm in diameter and 100–150 nm in length. A broad emission peak centered at 530 nm with a decay time of 1.5∼2 ms is obtained at the maximum excitation wavelength λexc = 370 nm.

Starch as a Sustainable Fuel for Solution Combustion Synthesis: Nanomaterials for Energy and Environmental Applications

2020 ◽  
Vol 16 ◽  
Author(s):  
Francisco Manoel dos Santos Garrido ◽  
Maria Isabel Spitz Argolo ◽  
Marta Eloísa Medeiros ◽  
José Márcio Siqueira
Keyword(s):  
Combustion Synthesis ◽  
Low Cost ◽  
Synthesis Method ◽  
Solution Combustion Synthesis ◽  
Lattice Defects ◽  
Environmental Applications ◽  
Solution Combustion ◽  
Energy And Environment ◽  
Positive Effects ◽  
Subsequent Application

Background: Currently, solution combustion synthesis (SCS) is considered a reproducible, flexible, and lowcost synthesis method for the preparation of nanomaterials. A new trend in the SCS method is the use of less polluting fuels, such as starch. The use of starch as fuel in SCS is very interesting for green chemistry, as it is renewable and has several advantages, including its abundance, low-cost, and non-toxicity. Objective: This paper provides a comprehensive review of the SCS method using starch as fuel. The main advantages of using starch as fuel will be illustrated with a wide variety of examples, highlighting its impact on the preparation of nanomaterials for energy and environmental applications. Conclusion: In a combustion reaction using starch as fuel, several positive effects are expected, such as non-violent propagation, combustion with the production of non-toxic gases (mainly CO2 and H2O), and development of pores during the release of gases. For example, several macroporous metal oxide foams were prepared using the SCS method, through an appropriate combination of urea and starch fuels. With this approach, it is possible to control the structure, lattice defects, crystallite size, specific surface area, porosity, and other characteristics of the synthetized nanomaterial. For example, by combining starch with other fuels, it is possible to control the concentration of lattice defects in metal oxides and modify the optical properties of these materials. These properties are of fundamental importance for the performance of these materials and their subsequent application in electrodes, electrocatalysts, and photocatalysts in the areas of energy and environment.

scholarly journals Spray-combustion synthesis: Efficient solution route to high-performance oxide transistors

2015 ◽  
Vol 112 (11) ◽  
pp. 3217-3222 ◽  
Author(s):  
Xinge Yu ◽  
Jeremy Smith ◽  
Nanjia Zhou ◽  
Li Zeng ◽  
Peijun Guo ◽  
...  
Keyword(s):  
Combustion Synthesis ◽  
High Performance ◽  
Low Cost ◽  
Sol Gel ◽  
Amorphous State ◽  
Single Step ◽  
Spray Combustion ◽  
Indium Gallium Zinc Oxide ◽  
Large Area ◽  
Solution Processed

Metal-oxide (MO) semiconductors have emerged as enabling materials for next generation thin-film electronics owing to their high carrier mobilities, even in the amorphous state, large-area uniformity, low cost, and optical transparency, which are applicable to flat-panel displays, flexible circuitry, and photovoltaic cells. Impressive progress in solution-processed MO electronics has been achieved using methodologies such as sol gel, deep-UV irradiation, preformed nanostructures, and combustion synthesis. Nevertheless, because of incomplete lattice condensation and film densification, high-quality solution-processed MO films having technologically relevant thicknesses achievable in a single step have yet to be shown. Here, we report a low-temperature, thickness-controlled coating process to create high-performance, solution-processed MO electronics: spray-combustion synthesis (SCS). We also report for the first time, to our knowledge, indium-gallium-zinc-oxide (IGZO) transistors having densification, nanoporosity, electron mobility, trap densities, bias stability, and film transport approaching those of sputtered films and compatible with conventional fabrication (FAB) operations.

Fabrication of near-net-shape Al2O3-fiber-reinforced Ni3Al composites by combustion synthesis

1995 ◽  
Vol 10 (7) ◽  
pp. 1736-1745 ◽  
Author(s):  
William C. Williams ◽  
Gregory C. Stangle
Keyword(s):  
Combustion Synthesis ◽  
Low Temperatures ◽  
Low Cost ◽  
Matrix Material ◽  
Scale Up ◽  
Synthesis Process ◽  
Fiber Reinforced ◽  
Al2o3 Fiber ◽  
Near Net Shape ◽  
Short Time

In this paper, a one-step, combustion synthesis-based process for fabricating Al2O3 fiber-reinforced Ni3Al is described. The process uses relatively low temperatures and pressures, and can be used to prepare relatively large, dense, near-net-shape articles that possess either simple or relatively complicated shapes. This process can be used to incorporate continuous, aligned fibers into the Ni3Al matrix material in such a way that the fibers are not damaged either mechanically (due to relatively small loads applied during the process) or chemically (due to the very short time at which the sample remains at elevated tempertures during the process). (Chopped fibers, as well as equiaxed particles or whiskers, could also be similarly incorporated using this process.) This combustion synthesis process is a relatively simple one-requiring only relatively low temperatures and pressures, as well as relatively low-cost starting materials-which suggests that its scale-up beyond the laboratory scale would be particularly straightforward.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Chromic Acid Etching of Polyethylene

1973 ◽  
Vol 31 ◽  
pp. 72-73
Author(s):  
J. D. Muzzy ◽  
R. D. Hester ◽  
J. L. Hubbard
Keyword(s):  
Chromic Acid ◽  
Low Cost ◽  
Acid Etching ◽  
Crystalline Morphology ◽  
Bulk Specimen ◽  
Morphological Studies ◽  
Perfect Form ◽  
Molecular Length ◽  
Lamellar Texture ◽  
Cost Studies

Polyethylene is one of the most important plastics produced today because of its good physical properties, ease of fabrication and low cost. Studies to improve the properties of polyethylene are leading to an understanding of its crystalline morphology. Polyethylene crystallized by evaporation from dilute solutions consists of thin crystals called lamellae. The polyethylene molecules are parallel to the thickness of the lamellae and are folded since the thickness of the lamellae is much less than the molecular length. This lamellar texture persists in less perfect form in polyethylene crystallized from the melt.Morphological studies of melt crystallized polyethylene have been limited due to the difficulty of isolating the microstructure from the bulk specimen without destroying or deforming it.

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