ZnO based thermopower wave sources

Walia, Sumeet; Weber, R. O.; Balendhran, Sivacarendran; Yao, David D.; Abrahamson, Joel T.; Zhuiykov, Serge; Bhaskaran, Madhu; Sriram, Sharath; Strano, Michael S.; Kalantar‐zadeh, Kourosh

doi:10.1039/c2cc33146b

Cited by 77 publications

(78 citation statements)

References 26 publications

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“…86 Other works in this field explore using other conduit materials such as Sb 2 Te 3 , 88 MnO 2 , 89 and ZnO. 90 Analytical work in this area has also advanced the understanding of self-propagating reaction waves. The inverse adiabatic reaction temperature is given by β = (C p E a )/((−ΔH) R) where C p is the specific heat, E a is the energy of activation of the reaction, (−ΔH) is the heat of reaction, and R is the specific gas constant.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

Low Dimensional Carbon Materials for Applications in Mass and Energy Transport

et al. 2013

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Low dimensional materials are those that possess at least one physical boundary small enough to confine the electrons or phonons. This quantum confinement reduces the dimensionality of the material and imparts unique and novel properties that are not seen in their bulk forms. Examples include quantum dots (0-D), carbon nanotubes (1-D), and graphene (2-D). Accordingly, these materials exhibit new concepts in mass and energy transport that can be exploited for technological applications. In this Perspective, we review several topics related to mass and energy transport in and around carbon-based low dimensional materials. Recent developments in the study of matter being transported through carbon nanotube and graphene nanopores are reviewed, as well as applications of excitonic, thermal, and electronic energy transport in carbon nanotubes. The nanometer-scale interior of a single-walled carbon nanotube (SWCNT) has been studied as a unique nanopore, exhibiting periodic ionic conduction currents and dimensionally confined material phases. The mechanism of gas transport through atomic-scale holes in graphene, which is otherwise a perfect barrier material, has been analytically studied. These insights on nanoscale mass transport will have important implications in systems ranging from biological nanopores to advanced water filtration devices. The electronic structure of semiconducting SWCNTs allows photogenerated excitons to be harnessed for single-molecule biosensing and as elements of a new class of all-nanocarbon near-infrared photovoltaics. The extremely high thermal and electrical conductivities of carbon nanotubes allows the generation of electrical energy from chemical reactions. The understanding of how low dimensional physics and chemistry influences mass and energy transport will facilitate the application of these materials to a variety of scientific challenges.

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Section: Chemistry Of Materialsmentioning

confidence: 99%

Low Dimensional Carbon Materials for Applications in Mass and Energy Transport

et al. 2013

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“…In the first experiment, high-temperature annealing at 740 °C, approximately the average surface temperature in the combustion wave, was performed for 3 h on the thin reddish-brown film of Fe 2 O 3 nanoparticles. This provided high-temperature conditions with a sufficient supply of thermal energy3851 without creating the chemical environment produced by combustion waves inside the thin film. Interestingly, no color change was observed after annealing, and no phase transformation occurred.…”

Section: Resultsmentioning

confidence: 99%

Facile One-pot Transformation of Iron Oxides from Fe2O3 Nanoparticles to Nanostructured Fe3O4@C Core-Shell Composites via Combustion Waves

Shin

Lee

Yeo

et al. 2016

Sci Rep

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The development of a low-cost, fast, and large-scale process for the synthesis and manipulation of nanostructured metal oxides is essential for incorporating materials with diverse practical applications. Herein, we present a facile one-pot synthesis method using combustion waves that simultaneously achieves fast reduction and direct formation of carbon coating layers on metal oxide nanostructures. Hybrid composites of Fe2O3 nanoparticles and nitrocellulose on the cm scale were fabricated by a wet impregnation process. We demonstrated that self-propagating combustion waves along interfacial boundaries between the surface of the metal oxide and the chemical fuels enabled the release of oxygen from Fe2O3. This accelerated reaction directly transformed Fe2O3 into Fe3O4 nanostructures. The distinctive color change from reddish-brown Fe2O3 to dark-gray Fe3O4 confirmed the transition of oxidation states and the change in the fundamental properties of the material. Furthermore, it simultaneously formed carbon layers of 5–20 nm thickness coating the surfaces of the resulting Fe3O4 nanoparticles, which may aid in maintaining the nanostructures and improving the conductivity of the composites. This newly developed use of combustion waves in hybridized nanostructures may permit the precise manipulation of the chemical compositions of other metal oxide nanostructures, as well as the formation of organic/inorganic hybrid nanostructures.

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“…Conventional approaches to enhancing the burning rate are focused on increasing the flame surface or modifying the combustion chemistry as described in [1]. Recent experiments [3,4] with micro-and nanosized materials can offer an alternative way to address these issues.…”

Section: Introductionmentioning

confidence: 98%

“…The reported systems are mostly aimed at micro-thrust and micro-power generation applications [3,4]. They consist of two key elements: the inert highly thermo-conductive unit and the reacting material, which are kept in thermal contact.…”

Section: Introductionmentioning

confidence: 99%

Combustion waves in composite solid material of shell–core type

Gubernov

Kurdyumov

Kolobov

2015

Combustion Theory and Modelling

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In this article, an asymptotic and numerical analysis of combustion wave propagation in shell-core composite solid energetic material is undertaken based on the diffusionalthermal model with an overall Arrhenius reaction step. Flame speed and structure are found for a broad range of parameter values. Two different regimes of flame propagation are identified. In the weak recuperation regime, the temperatures of the shell and core are monotonic functions of the coordinates, and they differ only slightly in the reaction zone of the flame. In the strong recuperation regime, the temperature of the shell is significantly higher than that of the core and has a sharp peak in the reaction zone with the maximum value exceeding the adiabatic flame temperature for pure energetic material. It is found that the highest level of flame acceleration in the composite material can be attained in the strong recuperation regime. The competition of these flame propagation regimes may lead to the coexistence of multiple combustion waves travelling with different velocities. The stability is investigated of combustion waves in the practically important strong recuperation regime.

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ZnO based thermopower wave sources

Cited by 77 publications

References 26 publications

Low Dimensional Carbon Materials for Applications in Mass and Energy Transport

Low Dimensional Carbon Materials for Applications in Mass and Energy Transport

Facile One-pot Transformation of Iron Oxides from Fe2O3 Nanoparticles to Nanostructured Fe3O4@C Core-Shell Composites via Combustion Waves

Combustion waves in composite solid material of shell–core type

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