A5029094785- Carbon Nanotubes in Composites
- Graphene research and applications
- Nanotechnology research and applications
- Advancements in Battery Materials
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Fiber-reinforced polymer composites
- Force Microscopy Techniques and Applications
- Photonic Crystals and Applications
- Fault Detection and Control Systems
- Ion-surface interactions and analysis
- Molecular Junctions and Nanostructures
- Chemical and Physical Properties of Materials
- Spectroscopy and Chemometric Analyses
- Silicon Nanostructures and Photoluminescence
- Diamond and Carbon-based Materials Research
- Drug Solubulity and Delivery Systems
- Nanofabrication and Lithography Techniques
- Organic Electronics and Photovoltaics
- Inhalation and Respiratory Drug Delivery
- Thin-Film Transistor Technologies
- Interactive and Immersive Displays
- Microencapsulation and Drying Processes
- Advanced Surface Polishing Techniques
- Perovskite Materials and Applications
Merck & Co., Inc., Rahway, NJ, USA (United States)
2024
Nokia (United Kingdom)
2012
North Carolina State University
2004
University of North Carolina at Chapel Hill
1998-2002
We report a method to fabricate polymer-based composites with aligned carbon nanotubes, and procedure determine the nanotube orientation degree of alignment. The were fabricated by casting suspension nanotubes in solution thermoplastic polymer chloroform. They uniaxially stretched at 100 °C found remain elongated after removal load room temperature. alignment determined x-ray diffraction. dispersion also studied transmission electron microscopy.
Composites of uniaxially oriented multiwalled carbon nanotubes embedded in polymer matrices were fabricated and investigated by transmission electron microscopy. In strained composite films, buckling was ubiquitously observed bent with large curvatures. By analyses a number nanotubes, the onset strain fracture estimated to be ≈5% ⩾18%, respectively. The wavelengths are proportional dimensions nanotubes. Examination surface showed adherence
Single-walled carbon nanotubes were studied by 13 C nuclear magnetic resonance (NMR). Two types of spins identified with different spin-lattice relaxation rates. The fast-relaxing component, assigned to metallic tubes, followed the behavior expected in metals, and density-of-states at Fermi level increased decreasing tube diameter. slow-relaxing component has a significantly lower level. Exposure oxygen substantial effect on rates both components.
The valence band and $\mathrm{C}1s$ photoemission spectra were measured from the tips sidewalls of multiwalled carbon nantoubes grown on Si substrates. results show an overall spectral shift to higher-binding-energy side, a larger density states at Fermi level, lower work function tips. These can be explained by assuming that level is slightly shifted upward located inside conduction We suggest electronic structure considerably affected defects.
Carbon nanotubes (CNTs) have attracted great attention as electron emitters. These field emission cathodes operate at room temperature without a heater, in contrast to thermionic emitters that often require considerable heater power for proper operation. Furthermore, CNTs the advantage of large aspect ratios, allowing local electric enhancements nanotube tips, further increasing their attractiveness However, due primarily materials issues such limited site density, screening effects, and...
The electronic structure of multiwalled carbon nanotubes aligned perpendicularly on a Si substrate was studied by means photoelectron spectromicroscopy. valence band and the C $1s$ spectra, measured systematically from spatially selected regions along tube axes, were fingerprint for lateral variations in electron density states bending, respectively. It found that tips have larger near Fermi level than sidewalls, whereas which would explain such spectral difference, not observed. is...
Article “Green” Fabrication of High-performance Transparent Conducting Electrodes by Blade Coating and Photonic Curing on PET for Perovskite Solar Cells Justin C. Bonner 1,†, Robert T. Piper Bishal Bhandari 2, Cody R. Allen Cynthia Bowers 3,4, Melinda A. Ostendorf Matthew Davis 5, Marisol Valdez 6, Mark Lee 2 Julia W. P. Hsu 1,∗ 1 Department Materials Science Engineering, University Texas at Dallas, 800 W Campbell Road, RL-10, Richardson, TX 75080, USA Physics, 3 Characterization Facility...
In this work we present a flexible Electrostatic Tactile (ET) surface/display realized by using new emerging material graphene. The graphene is transparent conductor which successfully replaces previous solution based on indium-thin oxide (ITO) and delivers more reliable for bendable displays. electrostatic tactile surface capable of delivering programmable, location specific textures. ET device has an area 25 cm2, consists 130 μm thin optically (>76%) mechanically structure overlaid...
The Cs intercalation process in multiwalled carbon nanotubes (MWNTs) was studied by cross-sectional scanning photoemission microscopy. atoms initially deposited on the tips of aligned diffused toward their roots. diffusion constant for MWNTs at room temperature evaluated from distribution measured along axes tubes. value 2×10−12 cm2/s obtained is seven orders magnitude smaller than that graphite, although local atomic structure an intercalated MWNT very similar to graphite.
Abstract This article summarizes the current status of carbon nanotube intercalation compounds. It focuses on structure and electrochemical properties intercalated single-walled nanotubes (SWNTs). Materials synthesis, purification characterization methods are also discussed. draws mostly from works performed at UNC.
Electronic structural changes in multiwalled carbon nanotubes caused by adsorbates and Cs deposition were studied photoemission spectroscopy. The formed air exposure slightly increased the work function. function is considered to be due surface dipole moment induced negatively charged adsorbates. On other hand, followed intercalation drastically decreased results suggest that field emission current enhancement are based on essentially different mechanisms; is, former associated with...
We present transfer printing as an enabling technology to realize heterogeneous photonic integrated circuits. The approach enables a cost-effective and intimate integration of III-V lasers on advanced high-speed Si PICs. It also the silicon-based opto-electronic components passive Si/SiN interposer.
Abstract A non-invasive capacitance instrument was embedded in the base of a vacuum-drying tray to monitor continuously residual amount solvent left pharmaceutical powder. Proof concept validated with Microcrystalline Cellulose laced water, as well water/acetone mixtures absorbed spray-dried Copovidone To illustrate role impermeability base, we derive model vapor sorption that reveals existence kinetic limit when solids are thinly spread, and diffusion greatly diminished effective...
Spray drying is a well-established method for preparing amorphous solid dispersion (ASD) formulations to improve the oral bioavailability of poorly soluble drugs. In addition characterization phase, particle attributes spray-dried intermediates (SDIs), including size, morphology, and microstructure, need be carefully studied controlled optimizing drug product performance. Although recent developments in microscopy technology have enabled analysis morphological individual SDI particles,...
Transfer-printing provides a highly versatile methodology to heterogeneously and intimately integrate diverse photonic electronic components in close proximity onto silicon photonics platforms.This technique can enable manufacturing route powerful integrated circuits.