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Conferences and Workshops

The PASREG 2010 Workshop

by: TcSUH Administration

Date: Thursday July 29, 2010

Time: 2:00 pm – 6:30 pm

Location: Washington, D. C. USA

Overview

The 7th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials is scheduled to take place July 29-31st in Washington, D.C. preceding the 2010 ASC Conference, ThePASREG 2010 Workshop will cover important processing and characterization aspects of bulk High Temperature Superconductors (HTS) and will highlight not only innovative applications that utilize bulk HTS materials but also novel developments in the field.

Bi-Weekly Seminar

Electrochemical Nanofabrication and Material Synthesis

Dr. Stanko R. Brankovic

by: Dr. Stanko R. Brankovic

Date: Friday July 23, 2010

Time: 12:00 pm – 1:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

In the last several decades, the electrochemical processes were proven to be enabling fabrication routes behind the train of high-tech enterprise. Today, the devices with sub-100 nm dimensions are produced routinely using the electrodeposi-tion and electropolishing as the standard processing operations in magnetic recording, microprocessors and MEMS/NEMS technologies. There are many other examples where the electrochemical processes are used as convenient if not "the only" approach to deliver desired structures, materials or catalytic surfaces. The traditional felds of electrochemical research like corrosion, anodization, or electrodeposition are rapidly being involved in different contemporary scientifc disciplines where the word "nano" is frequently used prefx. In this talk, several examples of the electrochemical nanofabrication and material synthesis are presented. In the first part, the optimum design and fabrication of Pt catalyst monolayer (ML) on Au(111) is demonstrated using surface limited red-ox reaction (SLRR). The morphology of the most active catalyst ML is identifed and compared with predictions of DFT calculations. The new synthesis route for catalyst ML fabrication using SLRR guided by molecular templates is discussed as well. Continuing the talk farther, the nanoporous Au electrodes produced by dealloying process are demonstrated as the generic ultrasound sensor devices. The sensitivity of these electrodes towards the incoming ultrasound excitation is compared against the state of the art piezoelectric ultrasound sensors. The transducer equation is presented highlighting the fundamental advantage of the electrochemical ultrasound sensors in terms of their design-determined sensitivity and reduced cost. The fnal part of the talk focuses on revealing the role of additives in electrodeposition process of magnetic flms. The functional relation between concentration of organic additives in the electrodeposition solution and their incorporation into magnetic alloys is described. The dependence of magnetic flms properties on additive concentration in the solution is quantifed shining a new light to the understanding and appreciation of the organic adsorption phenomenon at the electrode surface during electrodeposition of magnetic alloys.

Bi-Weekly Seminar

Cyclotron Phonon Scattering and Linear Magneto-Resistance in Suspended Multilayer Graphene

Dr. Haibing H. Peng

by: Dr. Haibing H. Peng

Date: Friday May 07, 2010

Time: 12:00 pm – 1:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

Magneto-transport in graphitic structures has been a fascinating subject for decades, and the discovery of anomalous integer quantum Hall effect has attracted enormous research interest in graphene since 2005. I will discuss recent efforts in my group to address the high-bias electron transport in suspended multilayer graphene devices created by a new experimental approach. We study the hot electron effect and magneto-resistance (MR) in suspended multilayer graphene under magnetic fields up to 15 T. A suppression of the hot electron effect is observed under high magnetic fields, indicating strong cyclotron-phonon scattering. In addition, we find a positive linear MR background on top of Shubnikov-de Hass (SdH) oscillations at drain-source bias Vd = 0. At finite Vd, the SdH oscillations are suppressed and a linear MR is clearly demonstrated. Potential origin of the linear MR is discussed.

Special Seminar

Superconducting Materials for Application

by: Mike D. Sumption

Date: Thursday May 06, 2010

Time: 12:00 pm – 1:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

In this presentation, an overview of OSU's CSMM/SuTC is presented, and the superconducting materials and applications under study there are discussed. Materials under investigation include Nb3Sn, MgB2, YBCO, and the oxypnictides. Studies of flux pinning in YBCO (as part of a collaboration with the AFRL) are briefly described, including pinning enhancement via nano-precipitates, both random and self assembled, along with their influence on Jc, Birr, and flux creep. This is followed by a discussion of phase formation and optimization studies of two very high performance Nb3Sn conductor types, one of which is a new design developed by OSU and commercial collaborators. After a brief description of initial efforts in the new oxypnictides, conductor development and materials property work for MgB2 is outlined. In this area, the talk focuses on the influence of the microstructure and connectivity on properties, in particular a newly discovered bifurcation in the magnetic and transport Jc as well as differences in irreversibility fields as determined by magnetic and transport techniques. A number of applications and application-relevant property investigations underway at the SuTC are then described. These include coil measurement and FEM modelling for MgB2, Nb3Sn, and YBCO prototype coils associated with applications in the areas of undulators, MRIs, rotors, and other specialty magnets. Efforts in YBCO conductor and cable AC loss, as well as YBCO coil-based quench propagation, are then discussed. Finally, modelling for MgB2 based fault current limiters is presented, as well as the set up of a facility for the testing of sub-scale MgB2 FCL coils.

Student Symposium

39th Semiannual Spring TcSUH Student Symposium

by: TcSUH Administration

Date: Tuesday May 04, 2010

Time: 1:00 pm – 7:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

All members of TCSUH are invited to attend the 39th Semiannual Student Symposium for presentations of original student work. The Student Symposium will begin at 1:00 p.m. with a brief review of the Center's progress during 2009 and an outline of plans for the future. The afternoon will then continue with a series of 15-minute presentations representing novel work by undergraduate and graduate students from each laboratory. A Symposium Program, including the schedule and abstracts for each presentation, will be provided at the door. The spring barbeque will follow the symposium at 5:15 p.m. on the Houston Science Center grounds.

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