June 2017 - Msepostdoc-list

Seminar notice for Matthew Krafcik's Ph.D. Final Exam, July 6, 9:30 a.m., in ARMS 1028, "Informing the Design of Hydrogel-Based Internal Curing Agents for Mortar: Effects of Hydrogel Chemistry on Mortar Microstructure and Mechanics"
by Son, Rosemary E 05 Jul '17

05 Jul '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Informing the Design of Hydrogel-Based Internal Curing Agents for Mortar: Effects of Hydrogel Chemistry on Mortar Microstructure and Mechanics" By Matthew J. Krafcik Purdue MSE Ph.D. Final Exam Advisor: Professor Kendra A. Erk ABSTRACT Despite the widespread usage of concrete and significant increases in concrete technology, including the use of new admixtures, supplementary materials, and improved batch design, two consistent problems for the concrete industry are carbon dioxide emissions and reduced service life due to cracking. High performance concrete with a water-to-cement ratio of below 0.42 is utilized to reduce greenhouse gas emissions and create a concrete with a dense microstructure and high compressive strength. Unfortunately, low water content increases the probability of early-age cracking due to volumetric shrinkage. Such cracking will decrease compressive strength, durability, and thus shorten service life. Internal curing has been shown to be a viable method of reducing or eliminating early-age cracking; however it is only in recent research that structure-property relationships between polymeric internal curing agents and bulk concrete performance are investigated. Superabsorbent polymer hydrogels of poly(sodium acrylate-co-acrylamide) are explored as a solution to early-age cracking in high performance concrete. Different weight fractions of monomers are used to formulate several chemically distinct types of hydrogels. Hydrogels are characterized with swelling tests in pure water, various salt solutions (sodium, calcium), and cement pore solution. Mortar with and without hydrogels is examined with autogenous shrinkage measurements, backscattered electron microscopy, and compression experiments. Model cement-hydrogel systems are also investigated with quasielastic neutron scattering. The chemical structure of the hydrogels is directly linked to swelling performance and is affected by the presence of cations, which were found to severely limit hydrogel swelling and, at times, cause deswelling. Mortar containing hydrogels displayed dramatically reduced shrinkage. Microscopy showed that while void space remained in mortar as the hydrogels deswelled, majority-acrylamide hydrogels allowed for the formation of calcium hydroxide inside the hydrogel void. Thus it is demonstrated that hydrogel composition can be tuned to change the microstructure of mortar depending on the desired application, which has wide-reaching implications for the admixture industry and advancement of cementitious materials. Date: Thursday, July 6, 2017 Time: 9:30 A.M. Place: ARMS 1028

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Seminar Reminder for John Coleman's Prelim, Wednesday, June 28, at 8:30 a.m., in ARMS 1028. "Numerical Modeling of Equiaxed Solidification: Application to Direct Chill Casting"
by Son, Rosemary E 27 Jun '17

27 Jun '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Numerical Modeling of Equiaxed Solidification: Application to Direct Chill Casting" By John S. Coleman Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Matthew J. M. Krane ABSTRACT The relative motion of the solid and liquid phases during alloy solidification produces long range composition heterogeneities (macrosegregation) that lead to unwanted mechanical property variations in the final product. The addition of grain refiners to promote heterogeneous nucleation of equiaxed grains, typical of direct chill (DC) casting, presents further complications since the grains are free to move and grow in the natural convection flow of the bulk liquid until their eventual coalescence into a packed bed. Several numerical models have been proposed to elucidate the interplay between various transport phenomena responsible for the formation of grain structure and macrosegregation during equiaxed solidification. These models are evaluated in terms of their applicability to DC casting and a volume-averaged model is chosen based on its ability to resolve the microscale and macroscale phenomena concurrently. The phenomenological submodels which provide model input are further evaluated and areas of future research are addressed. Date: Wednesday June 28, 2017 Time: 8:30 A.M. Place: ARMS 1028

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Fwd: EEE Research Seminar - Dr. Callie Babbitt - June 30, 2017
by Donna Bystrom 26 Jun '17

26 Jun '17

*DATE: Friday June 30, 2017* *TIME: 10:30 A.M.* *LOCATION: POTR 234 – Fu Room* ** *Dr. Callie Babbitt* *Associate Professor, Sustainability* *Golisano Institute for Sustainability*** *Rochester Institute of Technology* ** *“Sustainable management of end-of-life lithium-ion batteries”* ** *//* Patti Finney Administrative Assistant Graduate Program Purdue University Environmental and Ecological Engineering pfinney(a)purdue.edu <mailto:pfinney@purdue.edu> Potter Engineering Center, Room 364F Phone: 765-496-0545 Fax: 765-494-4482

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Midwest Workshop on Mechanics of Materials and Structures
by Coar, Stacey L 19 Jun '17

19 Jun '17

Dear Colleagues, I am pleased to let you know that the 3rd Midwest Workshop on Mechanics of Materials and Structures (MidMechMat 3) will take place on August 11th, 2017 at Purdue University. MidMechMat is a one day workshop that aims at bringing together researchers from the Midwest universities and industries working on contemporary topics in mechanics of new, complex and multi-functional materials to exchange ideas, present their most exciting research and explore new collaboration avenues in an informal and vibrant setting. The first workshop was held at UIUC and the second workshop was hosted at Northwestern University - both were of great success to serve the midwest community. Please visit the workshop website for this year: https://engineering.purdue.edu/MidMechMat/. The program has been posted. We will have 8 invited keynote speakers. We are currently seeking titles for the 180-second graduate student oral presentations and the poster session. Registration is required but free for all participants. The registration form can be filled at the conference website. Registration includes lunch and boxed dinner. Space is limited for this workshop, so please register the workshop at your earliest convenience. Please help us circulate this announcement to your colleagues who work broadly in the mechanics, materials and structures fields, and we appreciate that you would urge your group to register and participate in this exciting workshop. We look forward to seeing you all here at Purdue in August! Best wishes, Kejie Zhao On behalf of the co-organizers: Kejie Zhao, Thomas Siegmund, Pablo D Zavattieri, Arun Prakash, Vikas Tomar, Peilin Liao, Purdue University. Yuhang Hu, Ahmed Elbanna, UIUC Sinan Keten, Oluwaseyi Balogun, Northwestern University. Liang Qi, Yue Fan, University of Michigan. Melih Eriten, University of Wisconsin Ankit Srivastava, Illinois Institute of Technology. -- Kejie Zhao, PhD Assistant Professor of Mechanical Engineering, Purdue University 585 Purdue Mall, RM1074 West Lafayette, IN,47906 Office: 765-496-0224<tel:(765)%20496-0224> Homepage: https://engineering.purdue.edu/kjzhao

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TODAY: MSE Summer Seminar Speaker, Dr. Aaron Forster - NIST, Friday, June 16, 2017 / ARMS 1021 at 10:30am
by Coar, Stacey L 16 Jun '17

16 Jun '17

MSE Summer Seminar Speaker, Dr. Aaron Forster - NIST, Friday, June 16, 2017 / ARMS 1021 at 10:30am [cid:image001.png@01D2E115.734C0390] 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 Reminder for Stacey Kelly's MS Final Exam Seminar, June 16, at 1:30 in ARMS 3115. " Inverse Suspension Polymerization of Superabsorbent Polymer (SAP) Hydrogels for Internally Cured Concrete"
by Son, Rosemary E 15 Jun '17

15 Jun '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Inverse Suspension Polymerization of Superabsorbent Polymer (SAP) Hydrogels for Internally Cured Concrete" By Stacey L. Kelly Purdue MSE M.S. Final Exam Advisor: Professor Kendra A. Erk ABSTRACT Internal curing agents provide high performance concrete (HPC) with an internal source of hydration during hardening to mitigate shrinkage and increase strength. Superabsorbent polymer (SAP) hydrogels have proven to be effective internal curing agents because of their ability to absorb and release large amounts of water. In this study, inverse suspension polymerization is used to synthesize spherical poly(sodium-acrylate acrylamide) hydrogels and determine their impact on internally cured mortar through micro-structure analysis, autogenous shrinkage measurements and compression testing. The hydrogels were synthesized in house with two concentrations of PANa (17 and 83 wt%). SEM micrographs of cement paste segments confirmed that the hydrogels maintain their shape during mixing and the resulting voids are consistent with the hydrogel shape. Mortar containing these hydrogels showed a significant decrease in autogenous shrinkage and an increase in compressive strength compared to control mortar. This data was compared to a past study that used a solution polymerization technique to synthesize angular hydrogels. The spherical hydrogels improved cement hydration and mortar strength compared to mortar containing angular hydrogels. Date: Friday, June 16, 2017 Time: 1:30 P.M. Place: ARMS 3115

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Seminar Reminder for Youngman Yoo's Ph.D. Final Exam, June 16, at 10:00, in ARMS 1028 "Synthesis and Characterization of Hydrophobized Cellulose Nanocrystal Enhanced Sustainable Polymer Composites via Capsule and Coat Processing"
by Son, Rosemary E 15 Jun '17

15 Jun '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Synthesis and Characterization of Hydrophobized Cellulose Nanocrystal Enhanced Sustainable Polymer Composites via Capsule and Coat Processing" By Youngman Yoo Purdue MSE Ph.D. Final Exam Advisor: Professor Jeffrey P. Youngblood ABSTRACT Polymer nanocomposites show outstanding performance and bulk-processing abilities compared to conventional composites since they are recyclable, lightweight, and effective even at low filler loading. In particular, organic nanofillers with a high aspect ratio and low density are interesting because of their uniform dispersion in a polymer matrix. This feature provides excellent matrix/filler interaction for improving the thermal/mechanical properties of polymer resins, leading to lighter, cheaper, more environmentally friendly, and sustainable nanocomposites. This is why there is growing interest in sustainable cellulose materials. Nanocellulose, cellulose nanocrystals (CNCs) can be found in the natural structure of cellulose fibers. These rod-like shaped nanoparticles, which have a high aspect ratio, are nearly defect-free, and they are renewable and biocompatible. In addition, CNCs are stiffer than Kevlar and their mechanical properties are comparable to other reinforcements, even those with a low density. However, there are limitations and drawbacks in CNC based materials, including: moisture uptake/swelling, agglomeration of nanoparticles, difficulty in redispersing agglomerated particles, and their incompatibility with hydrophobic polymers. To solve these drawbacks of CNCs, it is essential to increase their hydrophobicity. One-pot synthesis for surface hydrophobization of CNCs was conducted by grafting PLA oligomers and fatty acids or their esters (biodiesel or plant oils). The key factor of this synthesis process in aqueous medium is the use of lactic acid, which is also a reactant of the hydrophobization synthesis and produces an intermediate product of polylactic acid oligomer grafted CNCs, as a solvent for the esterification of CNCs with acids or esters having a long hydrocarbon chain. It was shown that approximately one-third of all the available OH groups on the surface of CNCs were modified with the excess renewable materials which were recycled and reused as reactants in subsequent trials not only to decrease the environmental footprint of the product, but also to enhance economic feasibility. This modification level was enough to improve dispersibility in various organic solvents, such as acetonitrile, acetone, tetrahydrofuran, 1-methoxy-2-propanol, and chloroform, without damaging the structural morphology and crystallinity of hCNCs. Encapsulation technologies are widely used in a variety of applications (agrochemicals, cosmetics, food additives, ink/paints, catalysts, and pharmaceuticals); yet, protection and controlled release of core materials via conventional encapsulation methods remain relatively poor in many cases. At present, polymer composite membranes are extensively drawing attention as the upcoming alternative shell material. For the design and fabrication of mechanically robust microcapsules, polyurea-urethane (PU) composites containing hCNCs as an upcoming alternative shell material were developed through an in situ interfacial polymerization process. These nanostructured composite shells can be used to create a stable environment and allow phase change materials (PCMs) for thermal energy storage to undergo phase change without any outside influence. These microcapsules have high rigidity and maintain high strain tolerance. They also provide much better phase change and anti-osmotic behaviors, as well as, much clearer core-shell structures and higher encapsulation efficiencies than those of pure PU microcapsules. Finally, nanocomposite wood coating materials were successfully prepared by adding hCNCs to tung oil (TO). The coating process of the hCNC-TO finish using a flat paint brush or metering rod to form composite coats on various substrates (glass/steel panels or polymer film), as well as, their topography, optical properties, mechanical properties, gas permeability, and coating performance was investigated in this study. The hCNC-TO composite coatings show excellent anti-resistance, hardness, impact strength, gloss/color, gas barrier properties, and anti-weathering performance. Date: Friday, June 16, 2017 Time: 10:00 A.M. Place: ARMS 1028

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Reminder: MSE Summer Seminar Speaker, Dr. Aaron Forster - NIST, Friday, June 16, 2017 / ARMS 1021 at 10:30am
by Coar, Stacey L 14 Jun '17

14 Jun '17

MSE Summer Seminar Speaker, Dr. Aaron Forster - NIST, Friday, June 16, 2017 / ARMS 1021 at 10:30am [cid:image001.png@01D2E115.734C0390] 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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FW: [msestaff-list] power off Tuesday, June 13th, from Tim
by Coar, Stacey L 13 Jun '17

13 Jun '17

The power in 2093 will be tuned off at 8:00am tomorrow morning, Tuesday June 13th, till noon. If the power is back before that time I will send out an email as to when it has been restored. Tim -----Original Message----- From: Msestaff-list [mailto:msestaff-list-bounces@ecn.purdue.edu] On Behalf Of Donna Bystrom Sent: Thursday, June 08, 2017 9:06 AM To: faculty-list; msegradstudent-list(a)ecn.purdue.edu; staff-list; msepostdoc-list(a)ecn.purdue.edu Subject: [msestaff-list] power off Tuesday, June 13th, from Tim There will be a power shutdown in lab 2093 next Tuesday, June 13th, for an install of a new instrument. Electricians will start the work on Monday and then be able to give me a time frame for the shutdown. More details will be passed along as to a more definite time on Monday. Stay tuned. Tim VanMeter _______________________________________________ Msestaff-list mailing list Msestaff-list(a)ecn.purdue.edu https://engineering.purdue.edu/ECN/mailman/listinfo/msestaff-list

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MSE Summer Seminar Speaker, Dr. Aaron Forster - NIST, Friday, June 16, 2017 / ARMS 1021 at 10:30am
by Coar, Stacey L 09 Jun '17

09 Jun '17

[cid:image001.png@01D2E115.734C0390] 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

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