Combustion synthesis of one‐dimensional nanocrystalline silicon carbide

Soszyński

et al. 2011

Self-propagating high-temperature synthesis (SHS) can be regarded as an efficient method to obtain new nanomaterials. Different starting mixtures of magnesium powder with various carbonates (Li 2 CO 3 , Na 2 CO 3 , CaCO 3 , FeCO 3 , (NH 4 ) 2 CO 3 ) were tried and the auto-thermal reactions were carried out under both reactive (air) and neutral atmosphere (argon) with an initial pressure of 1 or 10 atm to yield novel nanomaterials. Both SiC nanofibres and novel branched SiC nanostructures were also obtained from Si/polytetrafluoroethylene (PTFE) mixtures and their synthesis and purification have been optimized. The application of those one-dimensional (1-D) SiC nanostructures as a composite filler is presented.

Section: Methodsmentioning

confidence: 99%

Ultra‐fast efficient synthesis of one‐dimensional nanostructures

Soszyński

et al. 2011

“…The thermolysis was initiated by resistive heating of a carbon tape immersed inside the reactants in the crucible. It took usually only 1–2 s 10 to accomplish the process, accompanied by an abrupt increase in pressure and temperature. After the combustion was completed, the gaseous products were vented.…”

Section: Methodsmentioning

confidence: 99%

“…General characteristics of the product morphology depend on the combustion atmosphere 9, 10. The tests in air yielded mostly a spongy material filling the whole reactor, with some crucible residue and a fine powder at the bottom of the reactor.…”

Section: Methodsmentioning

confidence: 99%

Spontaneous formation and characterization of silicon carbide nanowires produced via thermolysis

Soszyński

2011

We report on experiments to optimize the process of preparation of silicon carbide nanowires (SiCNWs) by a combustion synthesis (thermolysis). The morphology of starting reactants and combustion atmosphere were varied and we observed the effect of those variables on product yield and characteristics. The produced SiCNWs were characterized using SEM, TEM, XRD, and wet chemistry analysis.High-pressure reactor used for combustion synthesis, combustion reaction, and TEM of produced SiCNW

“…Thus, the CS processes have become an important tool in the synthesis of new inorganic materials . As an example, we showed elsewhere that SiC nanowires can be efficiently produced from the mixture of simple reactants (Si/Teflon ® ). Here, we aim at the CS formation of novel graphene‐related nanocarbons which have a unique variety of properties, which make them promising candidates for various applications.…”

Section: Introductionmentioning

confidence: 99%

Self‐propagating high‐temperature fast reduction of magnesium oxalate to novel nanocarbons

Kurcz

et al. 2016

Phone: þ48 22 55 26 416, Fax: þ48 22 822 59 96Combustion synthesis is known as a cost-effective technique to produce many novel ceramic nanomaterials such as nitrides, carbides, and intermetallic compounds. Herein, we report an extremely fast chemical transformation of magnesium-magnesium oxalate (Mg/MgC 2 O 4 ) mixtures into solid products containing different nanocarbons and MgO. Despite a wide range of molar ratios of reactants all combustions, carried out in Ar at 1 MPa, were successful. The solid products were chemically purified (leaching of unreacted Mg and MgO) and characterized by XRD, SEM/EDX, TEM, DSC, and Raman spectroscopy. The residue contained mostly layered (circa several nm thick) carbon petal-like nanostructures and carbon-coated MgO.