Rapid Heating of Silicon Carbide Fibers under Radio Frequency Fields and Application in Curing Preceramic Polymer Composites

Patil, Nutan; Zhao, Xiaofei; Mishra, Naveen; Saed, Mohammad A.; Radović, Miladin; Green, Micah J.

doi:10.1021/acsami.9b14971

Cited by 33 publications

(23 citation statements)

References 44 publications

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“…Our previous work has shown rapid RF heating property of commercial Hi‐Nicalon silicon carbide fibers due to presence of turbostratic carbon on surface; these fibers show rapid RF heating when aligned parallel to the electric field. [ 26 ] A 1 nm platinum sputter coating was applied to the surface of these fibers using a sputter coater. Figure A shows the SEM images of SiC fibers used as susceptors.…”

Section: Resultsmentioning

confidence: 99%

“…[ 23 ] In our recent work, carbon nanotubes and silicon carbide fibers were used as RF susceptors to cure preceramic polymers to silicon carbides for noncontact processing in 3D printing, composite manufacturing, and fiber processing. [ 18 ] Our group has studied RF susceptive nanomaterials including multi walled carbon nanotube (MWCNT), [ 20 ] metallic and semiconducting single walled carbon nanotube, [ 24 ] MXenes, [ 25 ] and silicon carbide fibers; [ 26 ] and these materials heat up to significantly high temperatures under low‐power RF radiation. The presence of sp 2 carbon in MWCNT and surface of SiC fibers results in rapid RF heating response.…”

Section: Introductionmentioning

confidence: 99%

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Radio Frequency Driven Heating of Catalytic Reactors for Portable Green Chemistry

Patil

Mishra

Saed

et al. 2020

Advanced Sustainable Systems

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conventional manufacturing. [1] Heterogeneous catalytic reactions, which require operating temperatures ranging from 100 to 1000 °C, pose a central challenge to achieving modular chemical processing in the absence of conventional plant-site utility infrastructure as this class of unit operation accounts for upwards of 80% of all chemical conversion processes. [2] Conventional catalytic reactors rely upon combustion for direct or indirect heating, with the latter requiring additional utility infrastructure for steam generation. [3] In addition to limiting the modularity of the resulting overall process, combustionbased heating of catalytic reactors results in significant greenhouse gas emissions. [4] According to a recent study, the chemical and petrochemical industries currently account for ≈10% of global energy consumption and ≈7% of greenhouse gas emissions. [2b] Lastly, external heating of catalytic packed beds introduces radial heat transport limitations, which can compromise catalyst efficiency, reaction selectivity, and opportunities for scale-up. [5] Direct heating of catalytic processes via application of external electrical fields (termed "power-to-chemicals") represents a transformative approach to overcome these limitations to realize modular, intensified processes operable from a variety of renewable electricity sources. The first published study of an electrically heated catalytic reaction was employed for catalytic converters in internal combustion engines to avoid cold-start emissions of NO x ; the converters were comprised of a thin layer of catalysts electrically heated using vehicle's batteries. [6] Labrecque et al. invented a similar electrically-heated reactor for gas phase reforming, which uses steel wool connected to two electrodes for heat generation from electricity. [7] Rieks et al. reported use of direct heating for dry methane reforming using FeCrAl alloy wash-coated with La-Ni-Ru based catalyst inside the reactor, which achieved a conversion of 29.4%. [8] Wismann et al. designed a laboratory scale reactor from FeCrAl alloy coated with nickel-impregnated wash coat on interior for methane reforming achieving 85% conversion of methane. [9] The direct electrical heating of catalytic surface assisted in minimizing thermal gradients, increasing catalyst utilization, and limiting unwanted byproduct formation. However, direct current approach requires electrical contact with reactor internals and thus is limited by safety and manufacturing issues.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radio Frequency Driven Heating of Catalytic Reactors for Portable Green Chemistry

Patil

Mishra

Saed

et al. 2020

Advanced Sustainable Systems

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“…4). 25,[35][36][37] RF elds have successfully shown composite processing capabilities such as curing of carbon ber (CF) reinforced thermosetting composites and out-of-oven ceramic manufacturing using multiple susceptors. Thermosetting prepregs are fabricated continuously by using energy-expensive methods such as large convection ovens, or infra-red lamps.…”

Section: Volumetric Heatingmentioning

confidence: 99%

“…4 Volumetric RF heating has successfully shown application in (counterclockwise, from top-right) ceramics and carbon fiber composite fabrication, catalytic reactors, thermally driven chemical reactions, and medical applications. 25,[35][36][37] Nanoscale Adv. CNT circuits ten times faster than conventional methods, identifying faulty circuits more reliably.…”

Section: Minireview Nanoscale Advancesmentioning

confidence: 99%

Radio frequency heating and material processing using carbon susceptors

et al. 2021

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“…Our group has previously demonstrated that certain nanomaterials act as RF susceptors, such that they will heat rapidly in response to an applied field; this allows for volumetric heating in a composite with susceptor fillers, such as carbon nanotubes (CNTs), laserinduced graphene (LIG), MXenes, [24] and carbon black. [23,[25][26][27] This phenomenon has been applied to a range of manufacturing applications such as welding of polymer sheets, [28] curing of epoxy nanocomposites [23] or preceramic polymer composites, [29] and screening of CNT circuits. [25,27] We have shown that the sample does not have to be directly connected to the power source, and it can heat the carbon nanomaterials at different applicator configurations (parallel plate and fringing field).…”

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confidence: 99%

Site‐Specific Selective Bending of Actuators using Radio Frequency Heating

Anas

Barnes

et al. 2021

Adv Eng Mater

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Actuators have gained considerable attention in recent years due to their wide range of applications, such as soft robotics, [1][2][3][4][5][6] artificial muscles, [7][8][9] drug delivery, [10] micromanipulation systems, [11,12] and switches. [13][14][15] Actuators convert external stimuli, such as temperature (including electrothermal [2,6,16] or photothermal [17,18] ), pressure, [19] and chemical inputs, [20] into mechanical energy. Actuators are useful when motion is needed in a place where humans cannot reach, such as hazardous or microscale environments. However, major challenges for actuators include the ability to move without direct connection to a power source and the ability to have site-specific actuation.Generally, for thermal actuators, two heat sources have been used as input: direct current (DC) power and photothermal from light. DC-based actuators have simple fabrication steps, [8,17] but actuators need to be connected to the source by wires, which limit their movement. Photothermal actuators can solve this physical limitation by using light to locally trigger heating. [5,18,21] These actuators also have advantages including price, safety, easy control, and fast response. Wang et al. used photothermal actuator as a propeller by continuously exposing the on/off cycles of infrared light at one end of the actuator. [5] In addition, liquid crystalline elastomers can be used in photothermal actuation; in the study by Zuo et al., three wavelengths were used to trigger the selective bending of actuators with three different dyes. [22] Radio frequency (RF) heating of nanomaterials is a noncontact heating method, [23] which can be used as heat source for actuation. Noncontact heating occurs due to the coupling of an induced electrical field with susceptors embedded in the material. Our group has previously demonstrated that certain nanomaterials act as RF susceptors, such that they will heat rapidly in response to an applied field; this allows for volumetric heating in a composite with susceptor fillers, such as carbon nanotubes (CNTs), laserinduced graphene (LIG), MXenes, [24] and carbon black. [23,[25][26][27] This phenomenon has been applied to a range of manufacturing applications such as welding of polymer sheets, [28] curing of epoxy nanocomposites [23] or preceramic polymer composites, [29] and screening of CNT circuits. [25,27] We have shown that the sample does not have to be directly connected to the power source, and it can heat the carbon nanomaterials at different applicator configurations (parallel plate and fringing field). [23] Despite the advantages that RF heating holds, the study of nanomaterial composite actuators using noncontact RF heating as a heat source has not been explored yet. RF heating behavior can be used as a means to not only locally trigger actuation but also perform site-specific actuation by controlling frequency.

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Rapid Heating of Silicon Carbide Fibers under Radio Frequency Fields and Application in Curing Preceramic Polymer Composites

Cited by 33 publications

References 44 publications

Radio Frequency Driven Heating of Catalytic Reactors for Portable Green Chemistry

Radio Frequency Driven Heating of Catalytic Reactors for Portable Green Chemistry

Radio frequency heating and material processing using carbon susceptors

Site‐Specific Selective Bending of Actuators using Radio Frequency Heating

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