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488 results on '"Wong-Foy, A."'

201. Alkane C−H Activation and Catalysis by an O-Donor Ligated Iridium Complex

Author

Roy A. Periana, Antek G. Wong-Foy, Gaurav Bhalla, and Xiangyang Liu

Subjects
Alkane, chemistry.chemical_classification, Colloid and Surface Chemistry, Chemistry, Stereochemistry, Polymer chemistry, chemistry.chemical_element, General Chemistry, Iridium, Biochemistry, Catalysis
Abstract

The first examples of well-defined, O-donor ligated, late-metal complexes that are competent for alkane C-H activation are reported. These complexes exhibit thermal and protic stability and are efficient catalysts for H/D exchange reactions with alkanes.

Published
2003
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207. Artificial Muscle for Reanimation of the Paralyzed Face

Author

Travis Tate Tollefson, Annjoe Wong-Foy, Steven P. Tinling, Harsha Prahlad, Craig W. Senders, and Levi G. Ledgerwood

Subjects
medicine.medical_specialty, Biocompatibility, Polymers, Facial Paralysis, Silicones, Biocompatible Materials, Gerbil, chemistry.chemical_compound, Physical medicine and rehabilitation, Animal model, Silicone, Fibrosis, medicine, Animals, Muscle, Skeletal, Inflammation, Nerve grafting, business.industry, General Medicine, medicine.disease, Electric Stimulation, Facial paralysis, Surgery, Disease Models, Animal, medicine.anatomical_structure, chemistry, Background current, Artificial muscle, Artificial Organs, Muscle transfer, Eyelid, Gerbillinae, business
Abstract

Background Current management of permanent facial paralysis centers on nerve grafting and muscle transfer; however, limitations of those procedures call for other options. Objectives To determine the durability and biocompatibility of implanted artificial muscle in a gerbil model and the degree of inflammation and fibrosis at the host tissue–artificial muscle interface. Methods Electroactive polymer artificial muscle (EPAM) devices engineered in medical-grade silicone were implanted subcutaneously in 13 gerbils. The implanted units were stimulated with 1 kV at 1 Hz, 24 h/d via a function generator. Electrical signal input/output was recorded up to 40 days after implantation. The animals were euthanized between 23 and 65 days after implantation, and the host tissue–implant interface was evaluated histologically. Results The animals tolerated implantation of the EPAM devices well, with no perioperative deaths. The muscle devices created motion for a mean of 30.3 days (range, 19-40 days), with a mean of 2.6 × 10 6 cycles (range, 1.6 × 10 6 to 3.5 × 10 6 cycles). Histologic examination of the explanted devices revealed the development of a minimal fibrous capsule surrounding the implants, with no evidence of bacterial infection or inflammatory infiltrate. No evidence of device compromise, corrosion, or silicone breakdown was noted. Conclusions Artificial muscle implanted in this short-term animal model was safe and functional in this preliminary study. We believe that EPAM devices will be a safe and viable option for restoration of facial motions in patients with irreversible facial paralysis.

Published
2012
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208. Exceptional surface area from coordination copolymers derived from two linear linkers of differing lengths

Author

Adam J. Matzger, Kyoungmoo Koh, Jacob D. Van Oosterhout, Saikat Roy, and Antek G. Wong-Foy

Subjects
chemistry.chemical_classification, Surface (mathematics), Materials science, chemistry, Performance ratio, Copolymer, Nanotechnology, General Chemistry, Polymer, Microporous material, Linker
Abstract

Although a multitude of microporous coordination polymers (MCPs) with ultrahigh surface area have been reported in the last decade, none of these can come close to matching the cost/performance ratio of conventional sorbents such as zeolites and carbons for most applications. There is a need to drastically reduce the cost of MCPs and this goal cannot be achieved through complex linker synthesis strategies so often used to boost MCP performance. Here two new MCPs: UMCM-8 (Zn4O(benzene-1,4-dicarboxylate)1.5(naphthalene-2,6-dicarboxylate)1.5), and UMCM-9 (Zn4O(naphthalene-2,6-dicarboxylate)1.5(biphenyl-4,4′-dicarboxylate)1.5) are described and the concept of using mixtures of readily available linear linkers that enforce different spacings between network nodes is introduced as a means to reduce interpenetration. These new MCPs demonstrate Brunauer–Emmett–Teller (BET) surface areas over 4000 m2 g−1 and high pore volumes over 1.80 cm3 g−1.

Published
2012
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216. Resolution of 129Xe Chemical Shifts at Ultralow Magnetic Field

Author

John Clarke, Robert McDermott, Sunil Saxena, Alexander Pines, Adam J. Moulé, Juliette A. Seeley, and Annjoe Wong-Foy

Subjects
Colloid and Surface Chemistry, Nuclear magnetic resonance, Chemistry, Chemical shift, Low magnetic field, Resolution (electron density), Isotopes of xenon, Spectral response, General Chemistry, Atomic physics, Biochemistry, Catalysis, Magnetic field
Published
2001
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218. All-Optical Byte Recognition for 40-Gb/s Phase-Shift-Keyed Transmission Using a Planar-Lightwave-Circuit Passive Correlator

Author

Kang, I., primary, Rasras, M., additional, Dinu, M., additional, Cappuzzo, M., additional, Gomez, L. T., additional, Chen, Y. F., additional, Buhl, L., additional, Cabot, S., additional, Wong-Foy, A., additional, Patel, S. S., additional, Giles, C. R., additional, Dutta, N., additional, Jaques, J., additional, and Piccirilli, A., additional

Published
2008
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219. A Programmable 8-bit Optical Correlator Filter for Optical Bit Pattern Recognition

Author

Rasras, Mahmoud S., primary, Kang, Inuk, additional, Dinu, Mihaela, additional, Jaques, James, additional, Dutta, Niloy, additional, Piccirilli, Alfonso, additional, Cappuzzo, Mark A., additional, Chen, Evans Y., additional, Gomez, Louis T., additional, Wong-Foy, Annjoe, additional, Cabot, Steve, additional, Johnson, Gregory S., additional, Buhl, Larry, additional, and Patel, Sanjay S., additional

Published
2008
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220. Reconfigurable all-optical byte recognition for 40-Gb/s phase-shift-keyed transmission using a planar-lightwave-circuit passive correlator

Author

Kang, I., primary, Rasras, M., additional, Dinu, M., additional, Cappuzzo, M., additional, Gomez, L. T., additional, Chen, Y. F., additional, Buhl, L., additional, Cabot, S., additional, Wong-foy, A., additional, Patel, S. S., additional, Giles, C. R., additional, Dutta, N., additional, Jaques, J., additional, and Piccirilli, A., additional

Published
2008
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222. Demonstration of A Reconfigurable 8-bit Optical Correlator Filter Using High-Index-Contrast Silica Waveguides

Author

Rasras, M. S., primary, Kang, I., additional, Dinu, M., additional, Jaques, J., additional, Dutta, N., additional, Piccirilli, A., additional, Cappuzzo, M. A., additional, Chen, E. Y., additional, Gomez, L. T., additional, Wong-Foy, A., additional, Cabot, S., additional, Johnson, G. S., additional, Buhl, L., additional, and Patel, S. S., additional

Published
2008
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223. Beryllium benzene dicarboxylate: the first beryllium microporous coordination polymer

Author

William W. Porter, Antek G. Wong-Foy, Dailly Anne M, and Adam J. Matzger

Subjects
chemistry.chemical_compound, chemistry, Coordination polymer, Inorganic chemistry, Materials Chemistry, chemistry.chemical_element, General Chemistry, Microporous material, Beryllium, Benzene, Bar (unit)
Abstract

The first Be-based microporous coordination polymer is shown to have a surface area of 3500 m2/g (BET) and a maximum excess H2 uptake of 53 mg/g at 24 bar and 77 K.

Published
2009
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240. Integrated resonance-enhanced variable optical delay lines

Author

Rasras, M.S., primary, Madsen, C.K., additional, Cappuzzo, M.A., additional, Chen, E., additional, Gomez, L.T., additional, Laskowski, E.J., additional, Griffin, A., additional, Wong-Foy, A., additional, Gasparyan, A., additional, Kasper, A., additional, Le Grange, J., additional, and Patel, S.S., additional

Published
2005
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245. Low-loss N×N wavelength router

Author

Dragone, C., primary, Doerr, C.R., additional, Bernasconi, P., additional, Cappuzzo, M., additional, Chen, E., additional, Wong-Foy, A., additional, and Gomez, L., additional

Published
2005
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249. 64 channel, 100 GHz VMUX with low-power, fast attenuators in high index contrast PLC

Author

A. Wong-Foy, Mark Cappuzzo, Evans Yifan Chen, Mark Earnshaw, L.T. Gomez, and C. Bolle

Subjects
Attenuator (electronics), Engineering, business.industry, High index, Integrated circuit, law.invention, Switching time, Power consumption, law, Low-power electronics, Electronic engineering, Integrated optics, Commutation, Electrical and Electronic Engineering, business
Abstract

Low-loss high-index-contrast designs enabling the monolithic integration of a 64 channel, 100 GHz VMUX in a compact die have been developed. The power consumption of the attenuators is reduced to 20 mW and the switching speed increased to 0.5 mS by electrical overdriving.

Published
2007
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250. Ultra-low power thermo-optic silica-on-silicon waveguide membrane switch

Author

A. Wong-Foy, Mark Cappuzzo, L.T. Gomez, Mark Earnshaw, and Evans Yifan Chen

Subjects
Membrane switch, Ultra low power, Waveguide (electromagnetism), Materials science, Silicon, business.industry, Polarization modulation, chemistry.chemical_element, Power (physics), Optics, chemistry, Power consumption, Low-power electronics, Electrical and Electronic Engineering, business
Abstract

An optimised ultra-low power thermo-optic waveguide switch design is presented. Under 25 mW power consumption was achieved for standard index-contrast silica-on-silicon material with reduced polarisation-dependent switching performance

Published
2007
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