self propagating high temperature synthesis.ppt

Self-propagating
High-Temperature
synthesis (SHS)
Presented by: Muhammad Hashami
Master student 2023
Kazakh National Named
Al-Farabi university

outline
• Brief introduction
• Procedure
• products
• Conclusion

Introduction
Self-propagating high-temperature synthesis (SHS), also known as
combustion synthesis, is a unique and effective method for
obtaining nanoparticles and advanced materials. This process
involves the exothermic reaction of metal or metalloid powders with
other reactants, leading to the formation of nanoparticles at high
temperatures. It was first discovered in 1967 By A.G.Merzhanov in
the study of Gas free burning of mixtures of powders of metals and
nonmetals. Thiis is an cost-effective method for nanoparticle
production.becouse the SHS is its self-sustaining nature and the
reaction propagates the reactants without the need for external
heating.

Procedure in SHS
• Ignition:
The SHS process need an initial heat source,
which can be a small spark or a localized external
heat application. This ignition activate the
exothermic reaction.
• Selection of Reactants:
The SHS process begins with the careful selection
of reactants. The choice of reactants depends on
the desired nanoparticle .usually one of the
reactants is a metal powder, and the other may be
a metal oxide, nitrate, or other oxidizing agents.
• Mixture Preparation:
Process of mixing the reactants is crucial for
the success of the reaction.

Procedure in SHS
• Nanoparticle Formation:
As the combustion wave starts, it breaks the metal
oxides or other reactants to their elemental forms.
Lead to the formation of nanoparticles. The
particle size is related to the ignition source, and
other parameters.
• Self-Propagating Reaction:
Once ignited, the exothermic reaction generates
a large amount of heat. It's often referred to as
a combustion wave. that can reach temperatures
about 2000°C.

Advantages
• Fast and Energy-Efficient: SHS is highly energy-efficient compared to other
nanoparticle synthesis methods, according to requiring minimal external heating.
• Control Over Particle Size: By adjusting parameters like reactant ratios, ignition
conditions, and cooling rates, it's possible to control the size of the nanoparticles.
• Diverse Material Compositions: synthesizes of a wide range of materials,
including metals, metal oxides, carbides.
• Cost-Effective: SHS is cost-effective because it doesn't require complex
equipment or extensive external heating.

SHS products
• Titanium Dioxide (TiO2) Nanoparticles:
TiO2 is essential in various applications, including photo
catalysis, photovoltaics, and sunscreen formulations. These
nanoparticles can harness solar energy for environmental
clearaty and energy conversion.
• Iron Oxide (Fe3O4) Nanoparticles:
due to their magnetic properties. used in magnetic resonance
imaging (MRI) contrast agents and drug delivery systems.
• Zirconia (ZrO2) Nanoparticles: Zirconia
nanoparticles exhibit high strength, thermal
stability, and chemical resistance, valuable
in ceramic manufacturing and catalyst
support materials.

SHS products
• Aluminum Nitride (AlN) Nanoparticles:
have excellent thermal conductivity. These nanoparticles are used
in electronic packaging, LED substrates, and high-power electronic
devices.
• Silicon Carbide (SiC) Nanoparticles:
SiC nanoparticles used as semiconductor substrates in high-power
and high-temperature electronic devices.
• Tungsten Carbide (WC) Nanoparticles:
WC nanoparticles are known for their extreme hardness and wear
resistance, uses in cutting tools and wear-resistant coatings.
• Cobalt Ferrite (CoFe2O4) Nanoparticles:
Cobalt ferrite nanoparticles, due to their magnetic properties, are
used in data storage, ferrofluids, and medical applications.

SHS products
• Copper (Cu) Nanoparticles:
uses in electronics, as conductive inks for printed electronics, and as
catalysts in chemical reactions.
• Nano carbon Materials (e.g., Carbon Nanotubes and
Graphene):
it can be used to generate carbide precursors, then can be transformed
into carbon nanotubes and graphene, crucial in nanoelectronics and
materials science.
• Multi-Component Alloy Nanoparticles:
have unique properties and applications. For example, nickel-
aluminum nanoparticles have applications in energetic materials
and aerospace technology.

Conclusion
Self-Propagating High-Temperature Synthesis (SHS) is on of th improtant
method forthe production of crucial nanoparticles that find applications in
industries. These nanoparticles, i mean metal oxides ceramics,
semiconductors, and magnetic materials, offer unique properties and play
roles in various scientific and industrial products. The controlling of
nanoparticle size and composition using SHS has led to remarkable
advancements in fields such as materials science, electronics, energy,
medicine, and more. They have enhance product performance, related to
medical treatments, and address environmental challenges. While the SHS
method provides an efficient and cost-effective means of nanoparticle
production, it is important to say about the need for safety precautions due
to the high temperatures and potential risks related in the process.such as
Proper safety measures are essential for responsible experimentation.

References
[1] Alexander G. Merzhanova. The chemistry of self-propagating high-temperature
synthesis. https://doi.org/10.1039/B401358C
[2] Wang, Lidong & Wei, Bing & Dong, Pei & Miao, Qinghua & Liu, Zheng & Xu,
Fubiao & Wu, Jingjie & Lou, Jun & Vajtai, Robert & Fei, Weidong. (2016). Wang-2016-
Large-scale synthesi. https://www.researchgate.net/publication/291166991_Wang-
2016-Large-scale_synthesi
[3] Titanium Dioxide Nanoparticles: Industrial Applications And Developments.
https://www.azonano.com/article.aspx?ArticleID=5849

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self propagating high temperature synthesis.ppt

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