A5006948707- Thermal Radiation and Cooling Technologies
- Carbon Nanotubes in Composites
- Transition Metal Oxide Nanomaterials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Sensor and Energy Harvesting Materials
- Graphene research and applications
- Photonic Crystals and Applications
- Advanced Thermodynamic Systems and Engines
- Advanced Materials and Mechanics
- Acoustic Wave Phenomena Research
- Solid-state spectroscopy and crystallography
- Gas Sensing Nanomaterials and Sensors
- Photonic and Optical Devices
- Conducting polymers and applications
- Thermal properties of materials
- Semiconductor materials and devices
- Mechanical and Optical Resonators
- Physics of Superconductivity and Magnetism
- Nanotechnology research and applications
- ZnO doping and properties
- Material Science and Thermodynamics
- Innovative Energy Harvesting Technologies
- Glass properties and applications
- Advanced Thermoelectric Materials and Devices
The University of Texas at Dallas
2016-2025
Frumkin Institute of Physical Chemistry and Electrochemistry
2023
The University of Texas at Austin
2014
LG (South Korea)
2002-2003
LG (United States)
2003
Academy of Sciences Republic of Uzbekistan
1988-1997
Individual carbon nanotubes are like minute bits of string, and many trillions these invisible strings must be assembled to make useful macroscopic articles. We demonstrated such assembly at rates above 7 meters per by cooperatively rotating in vertically oriented nanotube arrays (forests) made 5-centimeter-wide, meter-long transparent sheets. These self-supporting sheets initially formed as a highly anisotropic electronically conducting aerogel that can densified into strong thin 50...
Improved electrically powered artificial muscles are needed for generating force, moving objects, and accomplishing work. Carbon nanotube aerogel sheets the sole component of new that provide giant elongations elongation rates 220% (3.7 × 10 4 )% per second, respectively, at operating temperatures from 80 to 1900 kelvin. These solid-state–fabricated enthalpic rubbers having gaslike density specific strength in one direction higher than those steel plate. Actuation decreases can be...
It is a challenge to fabricate graphene bulk materials with properties arising from the nature of individual sheets, and which assemble into monolithic three-dimensional structures. Here we report scalable self-assembly randomly oriented sheets additive-free, essentially homogenous sponge that provide combination both cork-like rubber-like properties. These sponges, densities similar air, display Poisson's ratios in all directions are near-zero largely strain-independent during reversible...
Silver vanadium oxide (SVO) and V2O5 nanowires have been hydrothermally synthesized. The as-made are over 30 µm long 10–20 nm in diameter. a layered structure with d-spacing of 1.07 nm. can be fabricated into free-standing flexible sheets by suction filtration. electrical conductivity the SVO is 0.5 S/cm, compared to 0.08 S/cm for nanowires. Li ion diffusion coefficient was 7 times higher than that An electrochromic device from displayed color-switching time 0.2 s bleached state (green)...
Polycrystalline graphene grown by chemical vapor deposition (CVD) on metals and transferred onto arbitrary substrates has line defects disruptions such as wrinkles, ripples, folding that adversely affect transport properties through the scattering of charge carriers. It is found assembled with metal nanowires (NWs) dramatically decreases resistance films. Graphene/NW films a sheet comparable to intrinsic have been obtained tested transparent electrode replacing indium tin oxide in...
The fabrication and characterization of highly flexible textiles are reported. These can harvest thermal energy from temperature gradients in the desirable through-thickness direction. tiger yarns containing n- p-type segments woven to provide n–p junctions. A high power output up 8.6 W m−2 is obtained for a difference 200 °C. As service our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may be re-organized online delivery, but...
Abstract Strategies for obtaining materials that respond to external stimuli by changing shape are of intense interest the replacement traditional actuators. Here, a strategy enables programmable, multiresponsive actuators use either visible light or electric current drive change in composites comprising carbon nanotubes (CNTs) liquid crystal elastomers (LCEs) is presented. In nanocomposites, CNTs function not only roles mechanical reinforcement and enhancers thermal electrical conductivity...
γ-Graphyne is the most symmetric sp2/sp1 allotrope of carbon, which can be viewed as graphene uniformly expanded through insertion two-carbon acetylenic units between all aromatic rings. To date, synthesis bulk γ-graphyne has remained a challenge. We here report multilayer crystallization-assisted irreversible cross-coupling polymerization. A comprehensive characterization this new carbon phase described, including synchrotron powder X-ray diffraction, electron lateral force microscopy,...
The highest sheet symmetry form of graphyne, with one triple bond between each neighboring hexagon in graphene, irreversibly transforms exothermically at ambient pressure and low temperatures into a nongraphitic, planar-sheet, zero-bandgap phase consisting intrasheet-bonded sp2 carbons. synthesis this carbon is demonstrated, other phases are described for possible future from graphyne without breaking bonds. While measurements theory indicate that the reacting becomes nonplanar because...
The extremely high thermal conductivity of individual carbon nanotubes, predicted theoretically and observed experimentally, has not yet been achieved for large nanotube assemblies. Resistances at tube-tube interconnections tube-electrode interfaces have considered the main obstacles effective electronic heat transport. Here we show that, even infinitely long perfect nanotubes with well-designed interfaces, excessive radial radiation from surfaces quenching phonon modes in bundles are...
Significance There is a continuing search for manufacturable sheets having high strength and toughness in all sheet directions diverse applications, from airplanes to windmills. Cross-plied carbon fibers polymer resin requiring high-temperature cure presently provide the common solution. We demonstrate cross-linked graphene that are platelets, which resin-free, processable at low temperature, contain less than 10 wt % additives, record in-plane directions. This advance results successive use...
The application of solid-state fabricated carbon nanotube sheets as thermoacoustic projectors is extended from air to underwater applications, thereby providing surprising results. While the acoustic generation efficiency a liquid immersed sheet profoundly degraded by wetting, hydrophobicity in water results an envelope about nanotubes that increases pressure hundred-fold over obtained immersion wetting alcohols. Due nonresonant sound generation, emission spectrum liquid-immersed varies...
By combining a graphene layer and aligned multiwalled carbon nanotube (MWNT) sheets in two different configurations, i) on the top of MWNTs ii) graphene, it is demonstrated that optical, electrical, electromechanical properties resulting hybrid films depend configurations. As service to our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical...
A high-speed incandescent tension annealing process (ITAP) is used to increase the modulus and strength of twist-spun carbon nanotube yarns by up 12-fold 2.6-fold, respectively, provide remarkable resistance oxidation powerful protonating acids, freeze yarn untwist. This twist stability enables torsional artificial-muscle motors having improved performance minimizes problematic untwist during weaving yarns.
Abstract Stretching a coiled carbon nanotube (CNT) yarn can provide large, reversible electrochemical capacitance changes, which convert mechanical energy to electricity. Here, it is shown that the performance of these “twistron” harvesters be increased by optimizing alignment precursor CNT forests, plastically stretching twisted yarn, applying much higher tensile loads during precoiling twist than for coiling, using electrothermal pulse annealing under tension, and incorporating reduced...
Twisting is cool Rubber bands that are stretched and held in an extended shape for a while will extract heat from their surroundings as they allowed to relax, owing reversal of stress-induced crystallization, which exothermic process. Wang et al. examine the potential solid-state cooling twisted fibers, along with configurations such supercoiling, materials including natural rubber, polyethylene, nickel-titanium fibers. The related change entropy material it mechanically deformed. Science ,...
Carbon nanotubes (CNTs) can generate smooth-spectra sound emission over a wide frequency range (1–105 Hz) by means of thermoacoustics (TA). However, in the low frequencies f, where need for large area projectors is high, generation efficiency η open CNT sheets low, since ∝ f2. Together with this problem, nanoscale thickness sheets, their high sensitivity to environment and surface temperatures useful TA are other drawbacks, which we address here protective encapsulation free-standing inert...
Thermophones are highly promising for applications such as high-power SONAR arrays, flexible loudspeakers, and noise cancellation devices. So far, freestanding carbon nanotube aerogel sheets provide the most attractive performance a thermoacoustic heat source. However, limited accessibility of large-size other even more exotic materials recently investigated hampers field. We describe alternative source with high-energy conversion efficiency, additional functionalities, environmentally...
Lung cancer is the leading cause of cancer-related death in United States and approximately 85% all lung cancers are classified as nonsmall cell (NSCLC). We here use an innovative approach that may ultimately allow for clinician to target tumors aggressively reduce tumor burden patients with NSCLC. In this study, a platinum (Pt)-based chemotherapeutic (cisplatin, carboplatin, or oxaliplatin) holmium-165 (Ho), which can be neutron-activated produce holmium-166 radionuclide, have been...
Abstract Underwater pressure sensors with high sensitivity over a broad range are urgently required for the collection of valuable data on changes associated various wave motions. Here, class carbon‐nanotube‐based sensors, which can be directly used in oceans without packaging, is reported. They use salt water as an electrolyte electrochemically converting mechanical hydraulic energy into electrical and generating signals response to seawater. sense amplitudes from 1 mm (i.e., 10 Pa) 30 m,...
We present the state-of-the-art performance of air-coupled thermophones made thin, freestanding films randomly oriented single-walled carbon nanotubes (SWCNTs).