December 2019 - Msepostdoc-list

MSE Soft Materials Summer Research Symposium
by Davis, Chelsea S 29 Jul '20

29 Jul '20

All, The 7th Annual Soft Materials Summer Research Symposium will be held this summer on Tuesday mornings at 11am in ARMS 1028. This weekly symposium will feature one or two short research talks by graduate students early in their research careers here at Purdue. All are welcome to attend. The full summer schedule is attached to this email. Please feel free to share this announcement with any colleagues or students that you think might be interested in attending. We look forward to seeing you there. Sincerely, Prof. Chelsea Davis Chelsea Davis, Ph.D.<https://polymerinterfacialmechanics.com/> Assistant Professor School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering Room 2229 701 West Stadium Drive West Lafayette, IN 47907 Tel: (765) 494-9216<tel:(765)%20494-9216> Fax: (765) 494-1204<tel:(765)%20494-1204> [https://www.purdue.edu/brand/images/Purdue_University-150_Years_of_Giant_Le…] www.purdue.edu/giantleaps

1 4

Seminar Reminder for Amelia Leenig's Preliminary Exam. Seminar: Friday, Dec. 20, at 9:00 a.m., in ARMS 1103
by Son, Rosemary E 19 Dec '19

19 Dec '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Material Effects on the Performance of Athletic Cleated Shoe Stubs" By Amelia G. X. Leenig Purdue MSE Preliminary Exam Advisor: Professor Weinong Chen ABSTRACT Athletic cleated shoes are used in a wide variety of sports such as soccer, ultimate frisbee, lacrosse, football, baseball, etc. Most of the injuries in these sports occur without multiple player contact. Instead, translational and rotational friction interactions between shoe soles, feet, and playing surfaces can cause injuries to athletes. Cleat stub components play a large role in determining traction and friction characteristics of athletic cleated shoes. Therefore, it is important to understand how cleat stubs affect athletes' performance and how the material and physical properties change with increased use and aging. Cleat stubs are generally made of a polyether based thermoplastic polyurethanes (TPU). Degradation of TPU material properties occurs when exposed to UV-rays or elevated air temperatures for extended time periods. Surface characteristics are primarily affected when a TPU is experiencing fatigue or creep while aged in an oxidative solution. Determination of cleat stub performance can be characterized by the cyclic loading hysteresis loop response of TPUs. Cyclic loading behavior of TPUs indicates that the loading behavior is dependent on the strain rate induced on the material. Studies analyzed in this review provide some insight to how cleat stub materials will perform with increased use and environmental aging. Date: Friday, December 20, 2019 Time: 9:00 A.M. Place: ARMS 1103

1 0

Winter Recess Safety Reminder
by MSE Safety 19 Dec '19

19 Dec '19

Hello MSE Researchers, With winter recess in the near future, I wanted to remind all of you to be safe during the holidays as well as going into next semester. If you plan on working in the lab during winter recess, during the weekend, or late at night, please make you have a buddy close by in case there is an accident and helped is needed. This is important regardless of status (grad, post-doc, faculty, etc.). Remember also to come to the lab prepared having read all necessary materials beforehand such as relevant SOPs and the associated SDS. Please exercise extra caution as well when performing lab work over the break because very little faculty and staff will be here over the break to provide aid. Happy Holidays, Jenni Fifer Safety & Mechanical Testing Lab Technician Materials Science & Engineering Purdue University Phone: 765-494-9718 Email: fiferj(a)purdue.edu<mailto:fiferj@purdue.edu>

1 0

Memo: Fridge Cleaning 12-20
by Ku Blanco, Aury Y 18 Dec '19

18 Dec '19

Hi all, Please label or remove any fridge contents you would like to keep by the end of this week. I will be cleaning it before we head out for break and would appreciate your help in doing so! Please let me know of any odds and ends I can save for you in case you have already taken off 😊 Thank you, Aury Ku Administrative Assistant Purdue University School of Materials Engineering Neil Armstrong Hall of Engineering 765/494-4100 akublanc(a)purdue.edu<mailto:staceyl@purdue.edu> [https://www.purdue.edu/brand/images/Purdue_University-150_Years_of_Giant_Le…]

1 0

Prelim Notice, C McCormack, Thurs 12/19, 9:00 am
by Ku Blanco, Aury Y 17 Dec '19

17 Dec '19

Hi all, Please consider attending the following: [cid:image002.jpg@01D5B4DC.BE93F4F0] Thank you, Aury Ku Administrative Assistant Purdue University School of Materials Engineering Neil Armstrong Hall of Engineering 765/494-4100 akublanc(a)purdue.edu<mailto:staceyl@purdue.edu> [https://www.purdue.edu/brand/images/Purdue_University-150_Years_of_Giant_Le…]

1 0

Seminar Notice for Alexandra Loaiza Lopera tomorrow, Dec. 18, at 1:30, in ARMS 1021"Mechanical Properties at Nanoscale: Extrinsic and Intrinsic Parameters"
by Son, Rosemary E 17 Dec '19

17 Dec '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Mechanical Properties at Nanoscale: Extrinsic and Intrinsic Parameters" By Y. Alexandra Loaiza Lopera Purdue MSE Preliminary Exam Advisor: Professor David Bahr ABSTRACT Strengthening mechanisms in both bulk and nanostructure materials are activated in different way. These mechanisms are revised in this review and the way on how they are activated is also stated. There is a critical value at which it is defined what is bulk and what is nanomaterial, this value has been reported from few nanometers to few micrometers, nevertheless this range is still very broad due the uncertainty on when extrinsic and intrinsic parameters start to operate. In the efforts to assess mechanical properties accurately, nanoindentation have been widely used, given the great capabilities of the tool, however it is still unknown how tests should be performed in order to obtain the most accurate properties of the material. Statistical Nanoindentation Technique (SNT) is presented as a statistical tool to evaluate mechanical properties of heterogeneous materials at nanoscale. This document will layout the challenges of testing nanomaterials particularly nanofoams in which ligament size, chemical composition, relative density and porosity are key features that define microstructure and hence mechanical properties. Date: Wednesday, December 18, 2019 Time: 1:30 P.M. Place: ARMS 1021 School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering 701 West Stadium Ave. Room 2200 West Lafayette, IN 47907 765-494-4105 [PU150]

1 0

Seminar Reminder for Teal Dowd's Preliminary Exam. Seminar, Tuesday, December 17, at 12:30, in IMI 127. "Selective Laser Sintering: Coalescence Phenomena and the Effects of Process Parameters on Part Performance"
by Son, Rosemary E 16 Dec '19

16 Dec '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Selective Laser Sintering: Coalescence Phenomena and the Effects of Process Parameters on Part Performance" By Teal F. Dowd Purdue MSE Preliminary Exam Advisor: Professor Jan-Anders Mansson ABSTRACT Selective Laser Sintering (SLS) is a free-form three dimensional additive manufacturing process, capable of producing functional graded parts. The fundamental driving force for polymer SLS is coalescence of powder particles through reduction in Gibbs free energy once sufficient laser energy has been provided. The powder particles combine and densify through diffusion until a mostly dense part is created. Coalescence rate and quality are increased through smaller particles with high packing efficiency (optimized through binary size distributions), and using polymers with high mobility (low molecular weight and low viscosity). Part strength is highly dependent on correct build parameters. Research suggests that increased energy density (a function of laser power, scan spacing, and scan speed) is highly correlated with increased part modulus, density, and elongation at break, with the ceiling at the point of material degradation. Other major build considerations are build orientation, powder refresh rate, preheat temperature, base polymer crystallinity, and particle chemistry. Date: Tuesday, December 17, 2019 Time: 12:30 P.M. Place: IMI 127

1 0

MSE Seminar: Dr. Nicholas Jackson, Argonne National Laboratory, Dec. 12, 3:30 pm, ARMS B071
by Ku Blanco, Aury Y 11 Dec '19

11 Dec '19

Hi all, Please join us in giving a warm welcome to a special guest, Dr. Nicholas Jackson of Argonne National Lab. His seminar will take place tomorrow, December 12th, 3:30-4:30 PM in ARMS B071. [cid:image002.png@01D5AC32.667D07F0] Thank you, Aury Ku Administrative Assistant Purdue University School of Materials Engineering Neil Armstrong Hall of Engineering 765/494-4100 akublanc(a)purdue.edu<mailto:staceyl@purdue.edu> [https://www.purdue.edu/brand/images/Purdue_University-150_Years_of_Giant_Le…]

1 0

Seminar Notice for Tess Marconie. Dec. 12, at 8:30 a.m., in ARMS 1021“Stabilizing Aqueous Multicomponent Suspensions for Ceramic Processing”
by Son, Rosemary E 11 Dec '19

11 Dec '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR “Stabilizing Aqueous Multicomponent Suspensions for Ceramic Processing” By Tess D. Marconie Purdue MSE Preliminary Exam Advisors: Professor Rodney W. Trice and Professor Jeffrey P. Youngblood ABSTRACT Colloidal processing of ceramics provides many benefits over dry powder processing, including denser green bodies, controllable microstructures, and creation of complex-shaped parts. Processes which utilize water as the solvent are particularly attractive for being safe and environmentally friendly. Unfortunately, creating the highly loaded yet flowable suspensions appropriate for these processing routes is no easy task. Well-stabilized suspensions have been made with a variety of materials; however, many studies focus on suspensions containing one type of ceramic particle, even though many interesting engineering ceramics are composites. To create dense ceramic composites, a well-stabilized suspension is critical not only to realize high-density ceramic green bodies with efficient particle packing, but also to enable a homogenous distribution of phases, which will allow for good sintering behavior and desired material properties. This review includes a description of the interactions that may occur between dissimilar particles in suspension and shows how stabilization can be achieved and utilized to create dense ceramics. The implications of multicomponent suspensions on ceramic processing aspects such as use of polymer dispersants and microstructure development are also discussed. Date: Thursday, December 12, 2019 Time: 8:30 A.M. Place: ARMS 1021

1 1

Seminar Reminder for Saswat Mishra. Dec. 12, at 9:00 a.m., in ARMS 1103 "First-principles Approach to Model Point Defects in Materials and Predict their Corresponding Thermodynamic Transition States"
by Son, Rosemary E 11 Dec '19

11 Dec '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "First-principles Approach to Model Point Defects in Materials and Predict their Corresponding Thermodynamic Transition States" By Saswat Mishra Purdue MSE Preliminary Exam Advisor: Professor Alejandro Strachan ABSTRACT Defects are ubiquitous in materials and affect their physical, structural, chemical, and electrical properties. It is difficult to detect electronic states far from the band edge experimentally, and hence a few defect levels are challenging to characterize. First-principles study of defects can provide crucial insight into the position of these electronic trap states by complimenting experimentally observed states. However, the potential of a charged system under periodic boundary conditions diverges. Various techniques have been suggested to model charged defects using density functional theory (DFT), which use approximations to determine the energy. These approximations introduce spurious effects and taint the result, which can be corrected using various schemes. This work aims to compare two such correction schemes applied to a simple Silicon vacancy system and comment upon the predictability of the approaches. Date: Thursday, December 12, 2019 Time: 9:00 A.M. Place: ARMS 1103

1 0