April 2018 - Msepostdoc-list

REMINDER - Today *** PIZZA WEDNESDAY Special Seminar Speaker Professor Yair Ein-Eli - - ARMS 1021 11:30 am
by Coar, Stacey L 11 Apr '18

11 Apr '18

[cid:image005.jpg@01D3D175.64EB5700] [cid:image006.jpg@01D3D175.64EB5700] Stacey Stacey Coar Secretary/Development Assistant School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering 701 West Stadium Ave. Room 2300 West Lafayette, IN 47907 765-494-4100 scoar(a)purdue.edu<mailto:scoar@purdue.edu>

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Seminar Notice for Travis Thornell's Ph.D. Final Exam. Seminar: Tuesday, April 17, at 9:30 a.m., in ARMS 1028: Exam same day at 10:30, in ARMS 2237
by Son, Rosemary E 10 Apr '18

10 Apr '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Synthesis and Characterization of Model Acrylic-based Polymer Gels." By Travis L. Thornell Purdue MSE Ph.D. Final Exam Advisor: Professor Kendra A. Erk ABSTRACT Materials made from polymer gel networks are important to many everyday applications in health care to building materials. These gel materials can be easily synthesized in various ways, but characterizing the overall material mechanics and properties are challenging due to the soft nature of their respective bulk structures. Model acrylic-based copolymer gels were investigated to understand the fundamental characteristics and mechanical properties from different crosslinking and gelation processes. First, model hydrogels with fracture-healing characteristics similar to materials needed for injectable drug delivery systems were studied using shear rheology to determine timescales of fully healed networks. The industrially available gel was a thermoreversible triblock copolymer composed of poly(methyl methacrylate)-poly(n-butyl acrylate)-poly(methyl methacrylate) in 2-ethyl hexanol to form a physical gel from polymer-solvent interactions. A methodology of quantifying healing was developed from an applied constant shear rate and monitoring the shear stress response of the samples. The maximum shear stress responses observed during fracture and re-fracture after allowing the sample to rest indicated gel healing. Given sufficient time, gel healing was determined to be dependent on testing temperature and polymer concentration. The time for fully healed networks was achieved on the order of minutes for the lowest concentration of 5 vol. % at temperatures of 28 and 25°C to several hours for the highest concentration of 6 vol. % at lower temperatures of 23 and 20°C. Lastly, spherical superabsorbent polymer (SAP) gels with silica nanoparticles (SiO2) were synthesized from inverse suspension polymerization to form chemically crosslinked composite hydrogels of polyacrylamide and poly(acrylic acid). The hydrogels were studied for understanding the interaction of SiO2 nanoparticles within polyelectrolyte networks for use as a chemical admixture for internal curing of high performance concrete. The composite SAP hydrogels were produced with bare or silane-functionalized SiO2 particles to investigate the effects on swelling performance, shape, and cement paste microstructure. Date: Tuesday, April 17, 2018 Time: 9:30 A.M. Place: ARMS 1028

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Seminar Notice for Daw Gen Lim Ph.D. Final Exam: Seminar Thursday, April 12, in HAMP 1252; Exam 3:30, same day, in ARMS 2237
by Son, Rosemary E 09 Apr '18

09 Apr '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR “Investigation of Electrochemically Li-ion Active Materials for Li-ion Batteries” By Daw Gen Lim Purdue MSE Ph.D. Final Exam Advisors: Professor Jeffrey P. Youngblood and Professor Vilas G. Pol ABSTRACT Being the battery of the 21st century, Li-ion batteries have been making headway towards replacing traditional medium to large scale energy storage devices. Recent applications ranging from EVs to grid-level energy storage, have driven the design criteria of Li-ion batteries to evolve at a rapid pace. Three major goals are low cost, high electrochemical performance, and better safety. New targets set by the DOE to make Li-ion batteries more competitive in their new market sectors have been to decrease cost to $125 kWh-1 and increase specific gravimetric and volumetric energy density to 235 Wh kg-1, 500 Wh L-1, respectively. Keeping the overall theme of low-cost, high energy density, and improved safety. This thesis presents works on the three major components of a Li-ion battery: sustainable wheat derived-carbon anodes, high capacity V2O5|Graphene nanoplatelets composite cathodes, and rare earth nickelates as a potential solid-state electrolyte for improved safety. Systematic solid-state processing, structural, and electrochemical studies were conducted on wheat derived carbons. Coupling carbonization temperatures and structural evolution of biomass-derived carbons (in this case wheat), lithium insertion properties can be tuned, to create a high capacity and sustainable anode material. An optimal condition presents itself at a carbonization temperature of 600 ˚C with a stable lithiation capacity of 390 mAh g-1. In the Li-ion cell, the limiting factor in the total output capacity (mAh g-1) of the cell is governed mainly by the cathode materials, as cathode materials tend to be lithium-based transitional metal oxides (high density compared to anode materials). Having one of the highest lithium storage capacity, V2O5 is a cathode material that suffers from low electronic conductivity and particle fragmentation upon continuous lithium insertion and extraction. In this work, sonochemistry is utilized in the synthesis of V2O5|Graphene-nanoplatelets (GNPs) composite to improve electronic conductivity and kinetics of lithium-insertion and extraction. Surface modification of the graphene nanoplatelets during sonication of GNPs allow for in situ growth of V2O5 nanoparticles. With the size reduction of the V2O5 particles and the conductive GNPs backbone, the composites achieved 248 mAh g-1 specific cathode capacity; retaining 83% of initial capacity after 50 cycles. The previous two works illustrate strategies to create a low-cost and high electrochemical performance Li-ion battery via sustainable material implementation, structural and morphology control, and composite formation; this final work studies the electrochemical properties of perovskite rare-earth nickelates (specifically SmNiO3) and its integration as a solid-state electrolyte in an all-solid-state lithium-ion battery. Upon insertion of Li+ ion, SmNiO3 undergoes a Mott-transition, simultaneously allowing for a large amount of mobile Li+ to be stored at the interstitial sites (approaching a ratio of one dopant per unit-cell). The combination of a lattice expansion (~10% increase) and the interstitial doping creates a perfect condition for fast Li+ conduction with reduced activation energy. Initial efforts for the integration of the LiSmNiO3 in a solid-state-cell LiCoO2 |LiSmNi|Si results with initial charging capacities reaching 1338 mAh g-1. Date: Thursday, April 12, 2018 Time: 2:30 P.M. Place: HAMP 1252

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PIZZA WEDNESDAY Special Seminar Speaker Professor Yair Ein-Eli - Wednesday PIZZA - ARMS 1021 11:30 am
by Coar, Stacey L 09 Apr '18

09 Apr '18

We are have a special speaker on Wednesday and he will be providing Pizza at his seminar. Please send me a quick email and let me know if you are coming. We are trying to get a head count of how many people will be there. Thank you, Stacey [cid:image001.png@01D3CFF8.F99D48F0] Stacey Stacey Coar Secretary/Development Assistant School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering 701 West Stadium Ave. Room 2300 West Lafayette, IN 47907 765-494-4100 scoar(a)purdue.edu<mailto:scoar@purdue.edu>

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REMINDER: MSE Student Night April 26, 2018, Please Respond - RSVP
by Coar, Stacey L 09 Apr '18

09 Apr '18

Greetings Everyone, If you have not sent your RSVP to this year's Student Night on April 26th from 6:30 - 8pm, please do so as soon as you are able. This event is a great opportunity to network with your peers, industry professionals, faculty and staff, and food will be provided. This is also a great opportunity to see this year's senior design posters and the press boxes at Ross-Ade! See attached flyer for additional information. Important Info: * RSVPS are required (even for seniors) * Business attire, photos will be taken with Sponsors * Student and Faculty award presentations will be presented during the program RSVP HERE<https://purdue.ca1.qualtrics.com/jfe/form/SV_3q6QQa4lxfjrGAd> by April 16th. Robyn Jakes Chief Development Officer|School of Materials Engineering University Development Office | Purdue Research Foundation Neil Armstrong Hall of Engineering 701 West Stadium Avenue West Lafayette, IN 47907 765-494-4094 rnjakes(a)prf.org<mailto:rnjakes@prf.org> [Facebook Logo]<https://www.facebook.com/PurdueMSE/>[LinkedIn Logo]<https://www.linkedin.com/groups/5145880> [PRF logo 2c_small] giving.purdue.edu<http://giving.purdue.edu/>

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Seminar Reminder for Thomas C. Reeve's Ph.D. Final Exam. Seminar: Monday, April 9, at 9:30 a.m., in ARMS 3115; Exam same day, at 10:30, in ARMS 2222. " Nucleation, Growth, and Structure of Beta-Tin in Tin-Based Solder Alloys"
by Son, Rosemary E 06 Apr '18

06 Apr '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Nucleation, Growth, and Structure of Beta-Tin in Tin-Based Solder Alloys" By Thomas C. Reeve Purdue MSE Ph.D. Final Exam Advisor: Professor Carol A. Handwerker ABSTRACT Solidification of the β-Sn phase in Sn-based solder alloys is often unpredictable and difficult to induce, commencing heterogeneously from a highly-undercooled liquid. Additionally, the crystal structure of β-Sn is highly anisotropic and influences properties in the bulk material, such as elasticity, thermal expansion, resistivity, and diffusivity. Couple this intrinsic anisotropy with the difficulty in nucleation (often resulting in a relatively large β-Sn grain size), and the result is a high level of variability in solder joint mechanical and thermal properties. This research has aimed to enhance β-Sn nucleation and promote β-Sn grain refinement in Sn-based solders via the manipulation of alloy thermodynamics and solidification through the addition of micro-alloying elements, the influence of inoculating phases, and the introduction of growth-restricting solutes. In the first half of the work, micro-alloying additions of Al in Sn-Cu-Al and Sn-Ag-Cu-Al alloys were studied to examine the utility of Al micro-alloying additions for manipulating solder intermetallic compounds (IMC) and β-Sn grain structures. In these studies, additions of Al were shown to result in the formation of CuxAly (Cu33Al17 or Cu9Al4) IMCs. These CuxAly IMCs had an identifiable and preferred orientation relationship with the Cu6Sn5 phase. Both phases proved easily refined by rapid solidification techniques, and that refinement was maintainable during reflow cycling under specific compositional and thermal conditions. Despite the enhanced microstructural manipulation and control of IMCs demonstrated through this work, it was ultimately shown that the use of Al micro-alloying additions for refinement of β-Sn grain size was ineffective. The second half of the research was then devoted to identifying new inoculating phases for β-Sn. Based on crystallography and thermodynamics, the Sn-Ge alloying system was highlighted as a new possible solder alloy to potentially promote β-Sn grain refinement. Film deposition experiments revealed an orientation relationship between Ge-(111) single crystal substrates and liquid-state dewet pure Sn films. Density functional theory (DFT) models were utilized to examine this observed orientation relationship in comparison with the lattice parameter matching relationship between Sn and Ge that prompted the initial studies. Simulated interfacial binding energies of the different interface relations were calculated and discussed. This research has broadened the understanding of β-Sn nucleation in Pb-free solders, as well as impacted the field of Pb-free solder by applying solidification and phase transformations concepts, commonly implemented in large-scale castings, to the small-scale of microelectronics production. Date: Monday, April 9, 2018 Time: 9:30 A.M. Place: ARMS 3115

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TOMORROW: Friday, April 6, 2018 MSE 690 seminar Speaker Prof. Julie Schoenung, Univ. California, Irvine
by Coar, Stacey L 05 Apr '18

05 Apr '18

Good morning, Please see attached abstract and agenda for tomorrow's MSE 690 guest speaker Prof. Julie Schoenung. [cid:image004.jpg@01D3CCC5.82A54850][cid:image003.png@01D3CCC5.56AF77C0] Stacey Stacey Coar Secretary/Development Assistant School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering 701 West Stadium Ave. Room 2300 West Lafayette, IN 47907 765-494-4100 scoar(a)purdue.edu<mailto:scoar@purdue.edu>

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Fwd: Seminar Advertisement - NE
by Donna Bystrom 04 Apr '18

04 Apr '18

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Seminar Notice for Thomas C. Reeve's Ph.D. Final Exam. Seminar: Monday, April 9, at 9:30 a.m., in ARMS 3115; Exam same day, at 10:30, in ARMS 2222. " Nucleation, Growth, and Structure of Beta-Tin in Tin-Based Solder Alloys"
by Son, Rosemary E 02 Apr '18

02 Apr '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Nucleation, Growth, and Structure of Beta-Tin in Tin-Based Solder Alloys" By Thomas C. Reeve Purdue MSE Ph.D. Final Exam Advisor: Professor Carol A. Handwerker ABSTRACT Solidification of the β-Sn phase in Sn-based solder alloys is often unpredictable and difficult to induce, commencing heterogeneously from a highly-undercooled liquid. Additionally, the crystal structure of β-Sn is highly anisotropic and influences properties in the bulk material, such as elasticity, thermal expansion, resistivity, and diffusivity. Couple this intrinsic anisotropy with the difficulty in nucleation (often resulting in a relatively large β-Sn grain size), and the result is a high level of variability in solder joint mechanical and thermal properties. This research has aimed to enhance β-Sn nucleation and promote β-Sn grain refinement in Sn-based solders via the manipulation of alloy thermodynamics and solidification through the addition of micro-alloying elements, the influence of inoculating phases, and the introduction of growth-restricting solutes. In the first half of the work, micro-alloying additions of Al in Sn-Cu-Al and Sn-Ag-Cu-Al alloys were studied to examine the utility of Al micro-alloying additions for manipulating solder intermetallic compounds (IMC) and β-Sn grain structures. In these studies, additions of Al were shown to result in the formation of CuxAly (Cu33Al17 or Cu9Al4) IMCs. These CuxAly IMCs had an identifiable and preferred orientation relationship with the Cu6Sn5 phase. Both phases proved easily refined by rapid solidification techniques, and that refinement was maintainable during reflow cycling under specific compositional and thermal conditions. Despite the enhanced microstructural manipulation and control of IMCs demonstrated through this work, it was ultimately shown that the use of Al micro-alloying additions for refinement of β-Sn grain size was ineffective. The second half of the research was then devoted to identifying new inoculating phases for β-Sn. Based on crystallography and thermodynamics, the Sn-Ge alloying system was highlighted as a new possible solder alloy to potentially promote β-Sn grain refinement. Film deposition experiments revealed an orientation relationship between Ge-(111) single crystal substrates and liquid-state dewet pure Sn films. Density functional theory (DFT) models were utilized to examine this observed orientation relationship in comparison with the lattice parameter matching relationship between Sn and Ge that prompted the initial studies. Simulated interfacial binding energies of the different interface relations were calculated and discussed. This research has broadened the understanding of β-Sn nucleation in Pb-free solders, as well as impacted the field of Pb-free solder by applying solidification and phase transformations concepts, commonly implemented in large-scale castings, to the small-scale of microelectronics production. Date: Monday, April 9, 2018 Time: 9:30 A.M. Place: ARMS 3115

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