- Msepostdoc-list - ecn.purdue.edu

Fwd: MSEGSA end of summer BBQ Reminder
by Donna Bystrom 30 Jul '13

30 Jul '13

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Fwd: MSEGSA End of Summer BBQ
by Donna Bystrom 24 Jul '13

24 Jul '13

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Fwd: Predictive Science Cluster Seminar - Ilias Bilionis, Wednesday, July 17, 2013, 10:30 am, Room ME 2054
by Donna Bystrom 16 Jul '13

16 Jul '13

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Fwd: Call for Officers
by Donna Bystrom 09 Jul '13

09 Jul '13

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Fwd: seminar announcement for circulation
by Donna Bystrom 05 Jul '13

05 Jul '13

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SEMINAR NOTICE: A. Snyder PhD Final Exam July 11 2013 10:00 am, HAMP 1113
by Stacey, Lisa A 03 Jul '13

03 Jul '13

MATERIALS SCIENCE AND ENGINEERING SEMINAR Hybrid Materials for Sensing and Catalyst Applications By: Alexandra Snyder Ph.D. Final Examination Advisor: Prof. L. Stanciu ABSTRACT Novel hybrid materials are fabricated with the goal of achieving properties that are superior to those of each component individually. The properties of hybrid materials can be tailored by changing the composition or configuration, making them attractive for use in a wide variety of applications ranging from photovoltaics to drug delivery systems. Here I will discuss the synthesis and characterization of several hybrid material systems and their evaluation as photocatalysts or electrochemical sensors. Specifically, the surface chemistry and charge of polyelectrolyte microspheres were varied in order to investigate their effect on the immobilization configuration of two model enzymes for amperometric biosensors. Graphene was incorporated into enzyme-based and enzyme-free sensors in order to enhance electron transfer and amperometric sensitivity. In addition, TiO2 nanoparticles were dispersed throughout a cellulose nanofiber matrix to form photocatalytically active films for the degradation of organic molecules in water. The surfaces of the films were subsequently modified by Au and Ag nanoclusters in order to improve mechanical properties and enhance photocatalysis in simulated sunlight. Date: Thursday, July 11, 2013 Time: 10:00 A.M. Place: HAMP 1113 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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FW: Seminar Notice: Y. Wang PhD Prelim Pt I, 6/27/13 8:45 am, ARMS 3109
by Stacey, Lisa A 20 Jun '13

20 Jun '13

MATERIALS SCIENCE AND ENGINEERING SEMINAR Minimal Tortuosity Rechargeable Batteries: a Critical Analysis By: Yunbo Wang Ph.D. Prelim Exam - Part I Advisor: Prof. R. E. Garcia ABSTRACT In this prelim 1, existing and emerging microstructural science aspects that aim to describe the transport properties of the random porous structure of currently used commercial rechargeable lithium-ion batteries are reviewed. Most of the existing work is based on the Bruggeman relationship, which underestimates the transport resistance in porous electrodes due to the particle shape anisotropy and randomness in orientation. A two-dimensional OOF model was developed to quantify the transport for various electrode morphologies. Two possible electrode microstructure-optimizing approaches are presented to lower the lithium-ion transport resistance: a) Preparation of perfectly spherical LiMn2O4 particles through an emulsion-gel method. Here, a manganese acetate-based precursor will be heat-treated and further cast into 13mm diameter disk-shaped electrodes; and b) Centrifugal slip casting of morphologically anisotropic particles to orient the active material in the low tortuosity direction. The anisotropic slurry of LiMn2O4 will be cast into straight channel architectures to provide minimal tortuosity in the direction of lithium-ion transport. Date: Thursday, June 27, 2013 Time: 8:45 A.M. Place: ARMS 3109 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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FW: Seminar Notice: D. Chung, MS Final Exam, Tue. 6/25/13, 1:30 pm, ARM 1021
by Stacey, Lisa A 18 Jun '13

18 Jun '13

MATERIALS SCIENCE AND ENGINEERING SEMINAR The Effect of Microstructure on the Performance of Li-Ion Porous Electrodes By: Ding-Wen Chung Master of Science Final Examination Advisor: Prof. R. E. Garcia ABSTRACT By combining X-ray tomography data and computer-generated porous electrodes, the impact of microstructure on the energy and power density of lithium-ion batteries is analyzed. Specifically, for commercial LiMn2O4 electrodes, results indicate that a broad particle size polydispersity of active material delivers up to two times higher energy density than monodisperse-sized particles for low discharge rates, and a monodisperse particle size distribution delivers the highest energy and power density for high discharge rates. The limits of traditionally used microstructural properties such as tortuosity, reactive area density, particle surface roughness, morphological anisotropy were tested against degree of particle size polydispersity thus enabling the identification of optimal porous architectures. The effects of critical battery processing parameters, such as layer compaction and carbon black were also rationalized in the context of electrode performance. While a monodisperse particle size distribution exhibits the lowest possible tortuosity and three times higher surface area per unit volume with respect to an electrode conformed of polydisperse particle size distribution, comparable performance can be achieved by polydisperse particle size distributions with degrees of polydispersity less than one fifth of the average particle size. The use of non-spherical particles raises the tortuosity by as much as three hundred percent, which considerably lowers the power performance. However, the use of favorably aligned particles can maximize power performance, particularly for high C-rate applications. Date: Tuesday, June 25, 2013 Time: 1:30 P.M. Place: ARMS 1021 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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Fwd: Snacking and Blood Pressure Study
by Donna Bystrom 07 Jun '13

07 Jun '13

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REMINDER: Seminar Notice: E. Walker, PhD Prelim Pt I, Thur. 6/6/13, 9:00 am, ARMS 3115
by Stacey, Lisa A 05 Jun '13

05 Jun '13

MATERIALS SCIENCE AND ENGINEERING SEMINAR Surface Modification of Nitinol Medical and Dental Implants for Improved Biocompatibility and Corrosion Resistance By: Emily K. Walker Ph.D. Prelim Exam - Part I Advisor: Prof. J. P. Allain ABSTRACT The use of metal alloys in dental, orthopedic, and vascular implants is ubiquitous. Metals have many advantages over ceramics and polymers in terms of mechanical properties, however corrosion is a persistent problem. Nickel-titanium alloys, which go by the trade name of Nitinol, are of particular interest in the medical and orthodontic fields due to their unique mechanical properties, good biocompatibility, and good corrosion resistance. Ion leaching is a major concern with any metallic implant, however, and nickel in particular is especially harmful to cell metabolism. In addition, Nitinol is also susceptible to localized corrosion, such as pitting. In order to prevent nickel leaching and localized corrosion of Nitinol implants, many surface modifications have been explored. Chemical modification, ion implantation, coating deposition, and electropolishing have all been explored with varying degrees of success. The results in the literature from these studies are somewhat inconsistent, so a reliable technique for improving the implant surface without affecting its mechanical properties is desired. Date: Thursday, June 6, 2013 Time: 9:00 A.M. Place: ARMS 3115 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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