Patents Assigned to University of Dayton
  • Patent number: 7777478
    Abstract: A sensor including at least one sensor probe including a pair of electrodes; a vertically aligned nanotube disposed between the pair of electrodes; optionally a piezoelectric polymer on the nanotube; and optionally, a field source for generating a field, the field source operatively connected to the pair of electrodes; whereby when the sensor probe is contacted, a change in the field occurs or electricity is generated. Methods of using the sensors are also described.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: August 17, 2010
    Assignees: University of Dayton, Honda Motor Co., Ltd.
    Inventors: Liming Dai, Toshiyuki Ohashi
  • Patent number: 7771696
    Abstract: A composition is provided in which carbon nanofibers are functionalized with at least one moiety where the moiety or moieties comprise at least one bivalent radical. The composition can include a nanocomposite, such as polyimide films. Methods for making functionalized carbon nanofibers and nanocomposites are also provided.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: August 10, 2010
    Assignee: University of Dayton
    Inventors: David H. Wang, Loon-Seng Tan
  • Patent number: 7771880
    Abstract: A solid composite electrolyte membrane for use in a lithium battery is provided which exhibits a conductivity ranging from about 10?4 S cm?1 to about 10?3 S cm?1 at ambient temperature. The membrane is formed by providing a glass or glass-ceramic powder formed from a mixture of lithium carbonate, alumina, titanium dioxide, and ammonium dihydrogen phosphate. The powder is mixed with a conditioning agent and at least one solvent, followed by the addition of a binder and one or more plasticizers. The resulting slurry is cast into a tape which is then subjected to a binder burn-off and sintering process to form the membrane. The resulting membrane may be a glass-ceramic composite having a porosity ranging from 0 to 50%, or the membrane may be further infiltrated with a polymer to form a water-impermeable polymeric-ceramic composite membrane.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: August 10, 2010
    Assignee: University of Dayton
    Inventors: Binod Kumar, Joykumar Singh Thokchom
  • Publication number: 20100183950
    Abstract: Metal-free fuel cell cathodes having a catalytic layer of vertically-aligned, nitrogen-doped carbon nanotubes (VA-NCNTs) are provided. The fuel cell cathodes comprise a cathode body, a binder layer attached to an outer surface of the cathode body, and the catalytic layer, which is supported by the binder layer. The binder layer may comprise a composite of a conductive polymer and doped or undoped nonaligned carbon nanotubes. In a method for forming the fuel cell cathodes, the VA-NCNTs may be formed by pyrolysis of a metalorganic compound and integration of the nanotubes with nitrogen. The binder layer is applied, and the resulting supported nanotube array may be attached to the cathode body. Fuel cells comprising the fuel cell cathodes are provided. The fuel cell cathodes comprising VA-NCNTs demonstrate superior oxygen-reduction reaction performance, including for electrocatalytic activity, operational stability, tolerance to crossover effects, and resistance to CO poisoning.
    Type: Application
    Filed: December 18, 2009
    Publication date: July 22, 2010
    Applicant: UNIVERSITY OF DAYTON
    Inventor: Liming Dai
  • Publication number: 20100141939
    Abstract: Special polarization states are generated that have unique focusing properties that may be used to create extremely strong longitudinal fields. Combined with surface plasmon excitation, these polarization states can be used in apertureless near-field scanning optical microscopy systems. A radially polarized beam is directed into a plasmon-generating optical fiber comprising a metal coated, tapered, apertureless tip. The apertureless tip excites surface plasmon waves and direct the surface plasmon waves to the tip when a radially polarized beam propagates along the plasmon-generating optical fiber. An objective lens collects the near field optical signals from a sample positioned adjacent to the apertureless. Potential spatial resolution of the apertureless NSOM could reach beyond 10 nm. Such strong field enhancement allows the development of a reliable nano-Raman system that can measure mechanical as well as chemical compositions of samples with resolution beyond 10 nm.
    Type: Application
    Filed: June 21, 2007
    Publication date: June 10, 2010
    Applicant: University of Dayton
    Inventor: Qiwen Zhan
  • Publication number: 20100145004
    Abstract: Rigid-rod copolymer compositions incorporating PBO (poly(p-phenylenebenzobisoxazole)), DiOH-PBO (poly(2,5-dihydroxy-1,4-phenylenebenzobisoxazole), DiOH-PBI (poly(2,5-dihydroxy-1,4-phenylenebenzobisimidazole)), DiOH-PyBI (poly(2,5-dihydroxy-1,4-phenylenepyridobisimidazole), PBZT (poly(p-phenylenebenzobisthiazole)) and its corresponding dihydroxy analogues attached to a flexibilizing hexafluoroisopropylidene linkage are described. Also described are their fabrication into fibers by a dry jet wet spinning technique and the measured fiber mechanical properties. The copolymer compositions are highly flame-resistant and have potential utility for fire-protective clothing.
    Type: Application
    Filed: December 8, 2008
    Publication date: June 10, 2010
    Applicant: UNIVERSITY OF DAYTON
    Inventors: Thuy D. Dang, Zongwu Bai, Narayanan Venkat, Alexander B. Morgan
  • Patent number: 7716987
    Abstract: A non-contact thermo-elastic property measurement and imaging system and method thereof are described. Acoustic energy is incident on a first surface of a specimen under test. The acoustic energy is converted partially into heat by the specimen, causing a slight increase in the temperature in a region of interaction. The temperature increase is imaged using a high sensitivity infrared camera. Presence of defects (surface and subsurface) in the material modifies the distribution of temperature. An image of temperature distribution can be used for nondestructive testing and evaluation of materials. The temperature change in the specimen caused by acoustic excitation is related to thermal and elastic properties of the material. A measurement of the change in the temperature as a function of the amplitude of incident excitation can be used for direct measurement of thermo-elastic property of the specimen.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: May 18, 2010
    Assignee: University of Dayton
    Inventors: Shamachary Sathish, Richard Reibel, John T. Welter, Charles Buynak
  • Patent number: 7719392
    Abstract: A ferroelectric varactor suitable for capacitive shunt switching is disclosed. High resistivity silicon with a SiO2 layer and a patterned metallic layer deposited on top is used as the substrate. A ferroelectric thin-film layer deposited on the substrate is used for the implementation of the varactor. A top metal electrode is deposited on the ferroelectric thin-film layer forming a CPW transmission line. By using the capacitance formed by the large area ground conductors in the top metal electrode and bottom metallic layer, a series connection of the ferroelectric varactor with the large capacitor defined by the ground conductors is created. The large capacitor acts as a short to ground, eliminating the need for vias. The varactor shunt switches can be used to create a bandpass filter and a tunable notch filter. The bandpass filter is implemented by cascading the switches, and the bandpass filter implemented through the use of a resonance circuit.
    Type: Grant
    Filed: October 5, 2006
    Date of Patent: May 18, 2010
    Assignee: University of Dayton
    Inventors: Guru Subramanyam, Andre Vorobiev, Spartak Gevorgian
  • Publication number: 20100096678
    Abstract: Varactor shunt switches based on a nonlinear dielectric tunability of BaxSr(1?x)TiO3 (BST) thin-film on a sapphire substrates are presented. Nanostructured BST thin-films with dielectric tunability as high as 4.3:1 can be obtained on sapphire substrates, with very low loss-tangents below 0.025 at zero-bias and 20 GHz. The large capacitance of the varactor at zero bias can shunt the input signal to ground isolating the output port, resulting in the OFF state. When applying a bias voltage of approximately 10 V (a dc electric field of ˜250 kV/cm), the varactor's capacitance can be reduced to a minimum, allowing maximum transmission to the output resulting in the ON state. The microwave switching performance of the varactor shunt switch can be compared with the RF MEMS switches for potential applications at microwave and millimeterwave frequencies.
    Type: Application
    Filed: October 20, 2008
    Publication date: April 22, 2010
    Applicant: University of Dayton
    Inventor: Guru Subramanyam
  • Patent number: 7692270
    Abstract: A ferroelectric varactor suitable for capacitive shunt switching is disclosed. High resistivity silicon with a SiO2 layer and a patterned metallic layer deposited on top is used as the substrate. A ferroelectric thin-film layer deposited on the substrate is used for the implementation of the varactor. A top metal electrode is deposited on the ferroelectric thin-film layer forming a CPW transmission line. By using the capacitance formed by the large area ground conductors in the top metal electrode and bottom metallic layer, a series connection of the ferroelectric varactor with the large capacitor defined by the ground conductors is created. The large capacitor acts as a short to ground, eliminating the need for vias. The concept of switching ON and OFF state is based on the dielectric tunability of the ferroelectric thin-films. At 0 V, the varactor has the highest capacitance value, resulting in the signal to be shunted to ground, thus isolating the output from the input.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: April 6, 2010
    Assignee: University of Dayton
    Inventors: Guru Subramanyam, Andre Vorobiev, Spartak Gevorgian
  • Patent number: 7687436
    Abstract: Nanometer-sized non-superconducting particulates in superconductive REBCO films, where RE is a rare earth metal, for flux pinning enhancement and a method of forming are disclosed. A target with a second phase material sector portion and a superconductive material portion is used in a pulse laser deposition process to form films on substrates according to the present invention. The films consist of 10-20 nm-sized precipitates. In a 0.5 ?m thick film, a transport critical current density (Jc)>3 MA/cm2 at 77K in self-field was measured. In one embodiment, magnetization Jc at 77 K and 65K showed significant improvements in a composite YBCO films with fine precipitates produced according to the present invention as compared to non-doped (standard) YBCO films (>10 times increase at 9 T, 65 K).
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: March 30, 2010
    Assignee: University of Dayton
    Inventors: Chakrapani Varanasi, Paul N. Barnes
  • Publication number: 20100014586
    Abstract: System and method of providing improved signal compression using frame decimation through frame simplification and generating an encoded bitstream of video frames therefrom are disclosed. The encoding method comprises zeroing a difference frame generated by an encoder by using a feedback loop that injects a reconstructed frame, generated by the encoder of the difference frame, as a next frame of the video frames to be processed by the encoder. The encoding system comprises an input configured to provide a stream of video frames; a first process configured to generate a difference frame, and a second process configured to generate a reconstructed frame. A feedback loop of the system is configured to inject a generated reconstructed frame from the second process of a generated difference frame from the first process as a next frame of the video frames in the stream to be processed into the encoded bitstream by the encoding system.
    Type: Application
    Filed: December 20, 2006
    Publication date: January 21, 2010
    Applicant: UNIVERSITY OF DAYTON
    Inventors: Frank Scarpino, Eric Balster, Thaddeus Marrara
  • Publication number: 20100008825
    Abstract: A resonant sensor for detecting a specific environmental analyte is presented. The resonant sensor comprises a top conductive layer of two ground conductors and a center signal line, a bottom conductive layer of two ground lines shunted together by a shunt line and a sensing layer positioned between the top conductive layer and the bottom conductive layer. A capacitor is created by the overlap of the center signal line of the top conductive layer and the shunt line of the bottom conductive layer. Electrical properties of the sensing layer change in response to binding the specific environmental analyte with the sensing layer. The sensing layer can be an electro-optic polymer. Nanoparticles or carbon nanotubes can be dispersed within the sensing layer to bind with the specific environmental analyte. An integrated antenna can be incorporated into to sensor to receive radio frequencies for wireless, passive sensing.
    Type: Application
    Filed: July 14, 2008
    Publication date: January 14, 2010
    Applicant: University of Dayton
    Inventor: Guru Subramanyam
  • Publication number: 20090317724
    Abstract: Liquid-free lithium-air cells are provided which incorporate a solid electrolyte having enhanced ionic transport and catalytic activity. The solid electrolyte is positioned between a lithium anode and an oxygen cathode, and comprises a glass-ceramic and/or a polymer-ceramic electrolyte including a dielectric additive.
    Type: Application
    Filed: June 17, 2009
    Publication date: December 24, 2009
    Applicant: UNIVERSITY OF DAYTON
    Inventors: Binod Kumar, Jitendra Kumar
  • Patent number: 7618731
    Abstract: A ceramic-ceramic nanocomposite electrolyte having enhanced conductivity is provided. The nancomposite electrolyte is formed from chemically stabilized zirconia such as yttria stabilized zirconia or scandia stabilized zirconia and a heterogeneous ceramic dopant material such as Al2O3, TiO2, MgO, BN, or Si3N4. The nanocomposite electrolyte is formed by doping the chemically stabilized zirconia with the ceramic dopant material and pressing and sintering the composite. The resulting electrolyte has a bulk conductivity of from about 0.10 to about 0.50 S/cm at about 600° C. to about 900° C. and may be incorporated into a solid oxide fuel cell.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: November 17, 2009
    Assignee: University of Dayton
    Inventors: Binod Kumar, Christina H. Chen
  • Publication number: 20090211436
    Abstract: A compliant column sheath assembly for use in a gas chromatograph is provided which includes an open tubular column in the form of a helical coil having a coiled lengt of between about 5 and 15 cm. The sheath assembly further includes an insulating sheath which surrounds the open tubular column and a frame. When incorporated in a gas chromatograph, the compliant column sheath assembly allows samples to be analyzed in about 2 to 10 seconds.
    Type: Application
    Filed: May 19, 2006
    Publication date: August 27, 2009
    Applicant: UNIVERSITY OF DAYTON
    Inventors: Wayne A. Rubey, Richard C. Striebich, Jesse A. Contreras
  • Publication number: 20090186214
    Abstract: A method of growing carbon nanomaterials such as carbon ?anotubes, carbon nanofibers, and carbon whiskers on a variety of substrates is provided which includes exposing at least a portion of the substrate surface to an oxidizing gas, followed by forming catalysts on the substrate surface, either by immersing the carbon substrate in a catalyst solution or by electrodeposition. The treated substrate is then subjected to chemical vapor deposition to facilitate the growth of carbon nanomaterials on the surface thereof. The carbon nanomaterials may be grown on a variety of substrates including carbon substrates, graphite, metal, metal alloys, intermetallic compounds, glass, fiberglass, and ceramic substrates.
    Type: Application
    Filed: May 15, 2007
    Publication date: July 23, 2009
    Applicant: UNIVERSITY OF DAYTON
    Inventors: Khalid Lafdi, Lingchuan Li
  • Patent number: 7538062
    Abstract: An electroless deposition method of depositing metal nanoparticles onto conductive substrates such as carbon nanotubes is provided. The carbon nanotubes are provided on a support comprising a metal substrate and then immersed in an aqueous solution containing metal ions. The metal substrate metal has a redox potential which is lower than that of the metal ions in solution such that the metal ions are readily reduced into metal nanoparticles on the carbon nanotubes.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: May 26, 2009
    Assignee: University of Dayton
    Inventors: Liming Dai, Liangti Qu
  • Patent number: 7537663
    Abstract: A corrosion-inhibiting coating, process, and system that provides a tight, adherent zinc- or zinc-alloy coating that is directly deposited onto steel or cast iron surfaces for enhanced corrosion protection. A process for applying the coating is also provided. The process includes the application of two sequential aqueous baths. The first bath contains a precursor zinc compound while the second bath contains a reducing agent to deposit the zinc directly upon the steel or cast iron.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: May 26, 2009
    Assignee: University of Dayton
    Inventors: Andrew W. Phelps, Jeffrey A. Sturgill
  • Publication number: 20090084171
    Abstract: A device and method for measuring the quality of a vehicle oil change and the condition of oil obtained during an oil change is provided which includes an oil measurement compartment and at least one coolant sensor. The oil measurement compartment includes a conductivity sensor including a pair of horizontal parallel wires and a pair of vertical parallel wires which are capable of measuring the quantity, temperature, and conductivity of the drained oil. The coolant sensor is comprised of a hydrophilic material in contact with a permanent surface comprised of two spaced apart metal wires or traces. The coolant sensor measures the viscosity, coolant concentration, and overall condition of the oil.
    Type: Application
    Filed: September 26, 2008
    Publication date: April 2, 2009
    Applicant: University of Dayton
    Inventor: Robert Kauffman