Fast lithium-ion conducting thin film electrolytes integrated directly on flexible substrates for high power solid-state batteries
Advanced Materials
Abstract not provided.
Publications
Supporting Info: Low Loss Photopatternable Matrix Materials for LWIR-Metamaterial Applications
Journal of Materials Chemistry
Abstract not provided.
Low Loss Photopatternable Matrix Materials for LWIR-Metamaterial Applications
Journal of Materials Chemistry
Abstract not provided.
Crystal coherence length effects on the infrared optical response of MgO thin films
Abstract not provided.
Infrared Dielectric Resonator Metamaterial
Abstract not provided.
Aerosol Spray Deposition Development for Non-planar Ca(ZrTi)O3 Dielectrics
Abstract not provided.
Experimental Demonstration of an Infrared Cubic Dielectric Resonator Metamaterial
Science
Abstract not provided.
Low loss photopatternable matrix materials for LWIR-metamaterial applications
Advanced Functional Materials
Abstract not provided.
Polynorbornene as a low loss matrix material for IR metamaterial applications
Novel low loss photopatternable matrix materials for IR metamaterial applications were synthesized using the ring opening metathesis polymerization reaction (ROMP) of norbornene followed by a partial hydrogenation to remove most of the IR absorbing olefin groups which absorb in the 8-12 {micro}m range. Photopatterning was achieved via crosslinking of the remaining olefin groups with alpha, omega-dithiols via the thiol-ene coupling reaction. Since ROMP is a living polymerization the molecular weight of the polymer can be controlled simply by varying the ratio of catalyst to monomer. In order to determine the optimum photopattenable IR matrix material we varied the amount of olefin remaining after the partial hydrogenation. Hydrogenation was accomplished using tosyl hydrazide. The degree of hydrogenation can be controlled by altering the reaction time or reaction stoichiometry and the by-products can be easily removed during workup by precipitation into ethanol. Several polymers have been prepared using this reduction scheme including two polymers which had 54% and 68% olefin remaining. Free standing films (approx. 12 {micro}m) were prepared from the 68% olefin material using draw-down technique and subsequently irradiated with a UV lamp (365 nm) for thirty minutes to induce crosslinking via thiol-ene reaction. After crosslinking, the olefin IR-absorption band disappeared and the Tg of the matrix material increased; both desirable properties for IR metamaterial applications. The polymer system has inherent photopatternable behavior primarily because of solubility differences between the pre-polymer and cross-linked matrix. Photopatterned structures using the 54% as well as the 68% olefin material were easily obtained. The synthesis, processing, and IR absorption data and the ramifications to dielectric metamaterials will be discussed.
Solution deposition planarization of long-length flexible substrates
Applied Physics Letters
Abstract not provided.
High rate all-solution deposited YBCO coated conductors
Abstract not provided.
Structure-property relations in negative permittivity reststrahlen materials for IR metamaterial applications
We will present a study of the structure-property relations in Reststrahlen materials that possess a band of negative permittivities in the infrared. It will be shown that sub-micron defects strongly affect the optical response, resulting in significantly diminished permittivities. This work has implications on the use of ionic materials in IR-metamaterials.
Advanced buffer layer architectures prepared by chemical solution deposition
IEEE Transactions on Applied Superconductivity
Abstract not provided.
Crystal coherence length effects on the infrared optical response of MgO thin films
The role of crystal coherence length on the infrared optical response of MgO thin films was investigated with regard to Reststrahlen band photon-phonon coupling. Preferentially (001)-oriented sputtered and evaporated ion-beam assisted deposited thin films were prepared on silicon and annealed to vary film microstructure. Film crystalline coherence was characterized by x-ray diffraction line broadening and transmission electron microscopy. The infrared dielectric response revealed a strong dependence of dielectric resonance magnitude on crystalline coherence. Shifts to lower transverse optical phonon frequencies were observed with increased crystalline coherence. Increased optical phonon damping is attributed to increasing granularity and intergrain misorientation.
Processing Technologies for High Permittivity Thin Films in Capacitor Applications
Journal of the American Ceramic Society
Abstract not provided.
Towards printable open air microfluidics
We have demonstrated a novel microfluidic technique for aqueous media, which uses super-hydrophobic materials to create microfluidic channels that are open to the atmosphere. We have demonstrated the ability to perform traditional electrokinetic operations such as ionic separations and electrophoresis using these devices. The rate of evaporation was studied and found to increase with decreasing channel size, which places a limitation on the minimum size of channel that could be used for such a device.
Novel approaches to mitigate biofouling on water-treatment membranes
Abstract not provided.
Magnetodielectric sphere composites : an all dielectric route for low loss, isotropic DNG metamaterials
Abstract not provided.
Structure-property relations in negative permittivity Reststrahlen materials for IR metamaterial applications
Abstract not provided.
Printed Sensors for System State of Health Monitoring
Abstract not provided.
Crystal coherence length effects on the infrared optical response of MgO thin films
Applied Physics Letters
Abstract not provided.
Experimental realization of low loss isotropic DNG materials
Abstract not provided.
Direct write of metals and functional materials for three-dimensional interconnects and antennas
5th IMAPS/ACerS International Conference and Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies 2009, CICMT 2009
Recent advances in nanoparticle inks have enabled inkjet printing of metal traces and interconnects with very low (100-200°C) process temperatures. This has enabled integration of printable electronics such as antennas and radio frequency identification (RFID) tags with polyimide, teflon, PCBs, and other low temperature substrates. We discuss here printing of nanoparticle inks for three dimensional interconnects, and the apparent mechanism of nanoparticle ink conductivity development at these low process temperatures.
Analysis of micromixers and biocidal coatings on water-treatment membranes to minimize biofouling
Biofouling, the unwanted growth of biofilms on a surface, of water-treatment membranes negatively impacts in desalination and water treatment. With biofouling there is a decrease in permeate production, degradation of permeate water quality, and an increase in energy expenditure due to increased cross-flow pressure needed. To date, a universal successful and cost-effect method for controlling biofouling has not been implemented. The overall goal of the work described in this report was to use high-performance computing to direct polymer, material, and biological research to create the next generation of water-treatment membranes. Both physical (micromixers - UV-curable epoxy traces printed on the surface of a water-treatment membrane that promote chaotic mixing) and chemical (quaternary ammonium groups) modifications of the membranes for the purpose of increasing resistance to biofouling were evaluated. Creation of low-cost, efficient water-treatment membranes helps assure the availability of fresh water for human use, a growing need in both the U. S. and the world.
Direct Write of Metals and Functional Materials for RF Applications
Abstract not provided.
Results 101–125 of 179