2015
DOI: 10.3791/53147
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Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

Abstract: A reverse microemulsion is used to encapsulate monometallic or bimetallic early transition metal oxide nanoparticles in microporous silica shells. The silica-encapsulated metal oxide nanoparticles are then carburized in a methane/hydrogen atmosphere at temperatures over 800 °C to form silica-encapsulated early transition metal carbide nanoparticles. During the carburization process, the silica shells prevent the sintering of adjacent carbide nanoparticles while also preventing the deposition of excess surface … Show more

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Cited by 4 publications
(4 citation statements)
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“…Taken together, the HQE/DFT studies and prior model thin film studies suggest that TMCs could serve as ideal cores for supporting NM monolayer CS NPs. Given that NM/TMC NPs could only form in the presence of metal-terminated TMC surfaces (Figure ), our first goal was to develop a new synthetic method capable of achieving size-tunable, metal-terminated TMC NPs. , To prevent sintering while mitigating excess carbon deposition, metal oxide precursor NPs were encased in removable silica nanospheres using a reverse microemulsion. During carburization in a CH 4 /H 2 atmosphere, the silica remained porous to the carburizing/reducing gases while also mitigating TMC sintering .…”
Section: Enabling Nm/tmc Self-assemblymentioning
confidence: 99%
“…Taken together, the HQE/DFT studies and prior model thin film studies suggest that TMCs could serve as ideal cores for supporting NM monolayer CS NPs. Given that NM/TMC NPs could only form in the presence of metal-terminated TMC surfaces (Figure ), our first goal was to develop a new synthetic method capable of achieving size-tunable, metal-terminated TMC NPs. , To prevent sintering while mitigating excess carbon deposition, metal oxide precursor NPs were encased in removable silica nanospheres using a reverse microemulsion. During carburization in a CH 4 /H 2 atmosphere, the silica remained porous to the carburizing/reducing gases while also mitigating TMC sintering .…”
Section: Enabling Nm/tmc Self-assemblymentioning
confidence: 99%
“…Short-and middle-chain alcohols, such as ethanol, glycerol, and n-butyl alcohol, are multiselected as cosurfactants in microemulsions. [7][8][9] Anthocyanins are more and more welcomed to people due to its unique function, such as reducing risk for coronary heart disease [10] , visual improvement [11] , anti-mutagenic [12] , and anti-inflammatory effects. [13] In recent years, research on the extraction and separation of anthocyanins, its antioxidant activity in vitro, and in vivo physiological activity has increased.…”
Section: Introductionmentioning
confidence: 99%
“…Owing to a protecting silica matrix, the thermal treatment can be performed at various temperatures and annealing times tuning the final properties of the material. [40,41] The increased catalytic stability of IrO 2 -800 °C comparable to IrO 2ref. highlights potential industrial application.…”
Section: Discussionmentioning
confidence: 99%