Engineering Commons^™

Apparatus For Illuminating The Tip-Sample Interface Of An Atomic Force Microscope, Nancy Burnham, E Thoreson

Nancy A. Burnham

An apparatus for the delivery of radiation to the tip-sample interface of an atomic force microscope(AFM) is demonstrated. The pulsed light delivery system (PLDS) was fabricated to probe photoinduced conformational changes of molecules using an AFM. The system is 67 mm long, 59 mm wide, and 21 mm high, leaving clearance to mount the PLDS and a microscope slide coated with a thin film of photoactive molecules beneath the cantilever tip of a stand-alone AFM. The PLDS is coupled into a fiber pigtailed Nd:yttrium–aluminum–garnetfrequency doubled laser, operating at a wavelength of 532 nm. The radiation delivered to a sample through …

Application Of Fuzzy Logic To Systems Engineering, Caroline Lubert

Caroline P Lubert

No abstract provided.

Measuring Electrocatalytic Activity On A Local Scale With Scanning Differential Electrochemical Mass Spectrometry, K. Jambunathan, Andrew C. Hillier

Andrew C. Hillier

This paper describes a new technique entitled scanning differential electrochemical mass spectrometry ~SDEMS! that combines a quadrupole mass spectrometer with a membrane-covered capillary inlet and a high resolution positioning system that is designed to perform spatial mapping in solution near an electrode interface. Potential applications of this technique include the local characterization of anode catalysts for fuel cells as well as a range of analytical measurements and combinatorial screening studies. The capabilities of this technique are demonstrated by monitoring product evolution in several model electrocatalytic reactions, including the hydrogen evolution reaction, carbon monoxide oxidation, and the direct oxidation of methanol …

Screening The Reactivity Of Ptxruy And Ptxruymoz Catalysts Toward The Hydrogen Oxidation Reaction With The Scanning Electrochemical Microscope, S. Jayaraman, Andrew C. Hillier

Andrew C. Hillier

We report an application of the scanning electrochemical microscope that exploits its ability to spatially map the kinetics of heterogeneous electron-transfer reactions in order to perform screening measurements for combinatorial studies of electrooxidation catalysts. The ability to measure the activity of catalyst surfaces toward the hydrogen oxidation reaction via tip−sample feedback is used to characterize the activity of PtxRuy and PtxRuyMoz catalysts as a function of composition and electrode potential. Multielement band electrodes containing various compositions of PtxRuy and PtxRuyMoz deposits are created via pulsed electrochemical deposition onto patterned substrates. Catalyst compositions are verified through a combination of Auger electron …

Spherulite Formation From Microphase-Separated Lamellae In Semi-Crystalline Diblock Copolymer Comprising Polyethylene And Atactic Polypropylene Blocks, William Macknight, Masaya Ueda, Kazuo Sakurai, Shigeru Okamoto, David J. Lohse, Seiji Shinkai, Shinichi Sakurai, Shunji Nomura

William MacKnight

No abstract provided.

Performance Limits Of Track-To-Track Fusion Vs. Centralized Estimation: Theory And Application, Huimin Chen, T K. Kirubarajan, Yaakov Bar-Shalom

Huimin Chen

No abstract provided.

The Genesis Of Swarm Engineering, S. Kazadi

Sanza Kazadi

A Survey Of Reservation Schemes For Optical Burst Switching (Obs), Ioannis Karamitsos, Evangelos Varthis

John P. Karamitsos

No abstract provided.