- Msepostdoc-list - ecn.purdue.edu

Seminar Notice for Nesredin Kedir, Thursday, Jan. 18: Seminar, 1:30 p.m., in ARMS 1028; Exam, 3:00, in ARMS 2326. "Hertzian Fracture in Ceramics and Ceramic Coatings".
by Son, Rosemary E 08 Jan '18

08 Jan '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Hertzian Fracture in Ceramics and Ceramic Coatings" By Nesredin F. Kedir Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Weinong W. Chen ABSTRACT Advancement of gas turbine technology requires improvements in both cycle efficiency and overall performance. Much of the limitation, in this regard, emanates from the hot-section of the engine where a significant amount of thermal energy from combustion is wasted as exhaust. A promising approach to negate such loss considers substitution of standard Nickle-based superalloy components with advanced high-temperature ceramics. However, the inherent brittle nature of this material class has been shown to accentuate the effectiveness of impact damage by foreign debris. Hence, development of a robust semiempirical understanding of the process by which impact damage promotes failure becomes essential in accelerating ongoing technology transition efforts. A pervasive impact damage mechanism that is observed in both engine grade ceramics and coatings is Hertzian fracture. Subsequently, the underlying theory of Hertzian contact is presented with accompanying relations to observed quasi-static and dynamic fracture processes in glass, structural ceramics and ceramic coatings. Knowledge gaps in the dynamic loading regime are also discussed. Finally, progress on the development of an in-situ characterization method for observing impact induced fracture is offered. Date: Thursday, January 18, 2018 Time: 1:30 P.M. Place: ARMS 1028

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Seminar Reminder for Sri Nori, Tuesday, Jan 9, at 10:00 a.m., in EE 224. Exam: same day, at 11:30 a.m., in ARMS 2237. "Three Dimensional Characterization and Modelling of Irradiation Effects in Austenitic Stainless Steels for Nuclear Applications"
by Son, Rosemary E 08 Jan '18

08 Jan '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Three Dimensional Characterization and Modelling of Irradiation Effects in Austenitic Stainless Steels for Nuclear Applications" By Sri Tapaswi Nori Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Maria A. Okuniewski ABSTRACT Austenitic stainless steels have been qualified as structural materials in a nuclear reactor core due to their good high-temperature strength and corrosion resistance. However, the conventional 300 series alloys cannot endure the unusual combinations of high temperatures, neutron radiation dosages and stresses in Gen-IV nuclear reactors. In this context, high temperature ultrafine precipitation strengthened steel (HT-UPS) was developed and is being projected to be suitable for these advanced reactors because of its high temperature creep resistance. However, little is currently known about its radiation tolerance. Neutron irradiation induces defect structures over multiple length and time scales. High-energy X-rays can be employed to study this microstructural and micromechanical evolution under irradiation, as they provide three dimensional and non-destructive characterization. A review on some of these techniques like far-field high-energy diffraction microscopy (FF-HEDM) and near-field high-energy diffraction microscopy (NF-HEDM) will be presented and their application to the study of irradiation effects in HT-UPS at a mesoscale level, will be discussed. Phase field models have emerged as right numerical tools to simulate irradiation effects and these will be briefly introduced. In the context of studying neutron radiation damage response of HT-UPS, both the phase field models and the characterization techniques mentioned earlier will be utilized. Date: Tuesday, January 9, 2018 Time: 10:00 A.M. Place: EE 224

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Seminar Reminder for Alexandra Burch, Seminar: Monday, Jan. 8, at 11:00 a.m., in ARMS 3115. Exam 2:00, in ARMS 2237. "Characterization of Molecular Crystals and Identification of Mechanical Mocks Using Nanoindentation"
by Son, Rosemary E 05 Jan '18

05 Jan '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Characterization of Molecular Crystals and Identification of Mechanical Mocks Using Nanoindentation" By Alexandra C. Burch Purdue MSE Ph.D. Preliminary Exam Advisor: Professor David F. Bahr ABSTRACT Due to limitations such as the safety and cost of testing energetic materials, particularly explosives, mock materials that are inert and can simulate the mechanical properties of an energetic material may be desired. These mock materials, often found in pharmaceuticals and foods, are often used and tested in the form of small submillimeter sized crystals, with which typical crystal size and geometry make many mechanical tests difficult or impossible. Therefore nanoindentation can be useful in measuring the mechanical properties of these crystals without the need to grow large single crystals or do additional processing on existing crystals. In investigating materials as potential mocks, results of an indentation test that may be useful are hardness, elastic modulus, elastic-plastic response, and indentation fracture. Fracture in particular is not a direct measurement made by nanoindentation, but rather can be deduced by superimposability or lack thereof of indentation unloading traces. Previously, sucrose has been used as a mock material for some energetic materials, notably HMX and RDX, but may not be the most suitable simulate due to its relatively low density and poor thermal stability. Recently, three new materials have been proposed as potential mocks for HMX based on density, crystal structure, and thermal stability: 5-iodo-2'-deoxyuridininine 2, 3, 4, 5, 6 - pentafluorobenzamide, and N,N'- bis (2, 3, 4, 5, 6 -pentafluorophenyl)oxamide. These materials were chosen based on crystal structure, density, and thermal properties, but mechanical similarities to HMX were not tested. It is proposed that minimum mechanical similarity thresholds can be established for declaring a material as a mock; that nanoindentation can be used to identify which of the previously named three materials is the most appropriate mechanical mock for HMX by comparing hardness and elastic modulus values, elastic-plastic behavior, and critical stress to fracture, as well as that the same methods can be applied to other potential explosive-mock systems; that minimum similarity thresholds can be established for what degree of superimposability of indentation unloading curves is indicative of indentation fracture; and that mechanical mocks can be found in molecular crystals that do not share identical crystal structures. Date: Monday, January 8, 2017 Time: 11:00 A.M. Place: ARMS 3115

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Fwd: Dr. Nasim Anousheh Seminar Monday, January 8th
by Donna Bystrom 05 Jan '18

05 Jan '18

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Seminar Notice for Duo Huang's Preliminary Exam. Seminar: Friday, Jan. 12, at 9:30 a.m., in ARMS 3115. Exam: same day, at 3:00, in ARMS 2326. " Fe-Mn Alloys as Biodegradable Metallic Materials"
by Son, Rosemary E 03 Jan '18

03 Jan '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Fe-Mn Alloys as Biodegradable Metallic Materials" By Duo Huang Purdue MSE Ph.D. Preliminary Exam Advisors: Professors David Johnson and Professor Matthew J. M. Krane ABSTRACT Biodegradable metallic materials are considered promising candidates to replace traditional permanent implants. Among all the metallic materials studied, Fe-Mn alloys show their potential to be a new type of biodegradable alloys. In this study, the design strategy of Fe-Mn alloys and the factors affecting Fe-Mn alloys' biodegradation behavior as well as mechanical properties are discussed. For alloy designing, adding less noble elements to form a solid solution and adding nobler elements to form intermetallic phases can both accelerate corrosion rates. The mechanical properties of Fe-Mn alloys are also discussed in the study. The effect of Mn concentration and intermetallic phases can modify alloys' mechanical properties. Considering all the factors discussed, a type of high manganese steel, Hadfield steel with 1.0 - 1.4 wt.% C and 10 - 14 wt.% Mn is proposed. Its unique properties make it possible to improve corrosion rate and mechanical properties at the meantime. Date: Friday, January 12, 2018 Time: 9:30 A.M. Place: ARMA 3115

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Seminar Notice for Shoumya Shuvo's Preliminary Exam. Seminar: Wednesday, Jan. 10, at 12:00, in ARMS 1021. Exam: same day at 1:30, in ARMS 2326
by Son, Rosemary E 03 Jan '18

03 Jan '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Dynamic Investigation of Catalytic Nano-Materials using Advanced Transmission Electron Microscopy Techniques" By Shoumya Nandy Shuvo Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Volkan Ortalan ABSTRACT Heterogenous Catalysis is the mainspring of many chemical and energy transformation processes in several industries. The surface of a catalyst functions at the interface of the solid-gas phase or solid-liquid phase, paving in a pathway which is kinetically favorable. Different catalyst catalyzes distinct important reactions, the product of which are purely vital to the technological advancement, out of which Water-Gas-Shift (WGS) reaction is of utmost importance. However, in certain reaction conditions, these catalysts tend to sinter which eventually deteriorates their catalytic activity. Deep and fundamental understanding of the sintering mechanism is therefore imperative to emerge into a cleaner environment through effective chemical processes. With the advent of Advanced Transmission Electron Microscopy techniques, it has become possible to perform in-situ experiments at atomistic levels, thereby giving insights about the mechanism of sintering of catalytic materials in detail and also their wetting/de-wetting capabilities in virtue of the strong-metal-support-interaction (SMSI) and strong-metal-support-bonding (SMSB). Proper optimization and tuning of the aforementioned parameters and mechanisms could lead to the development of improved catalysts and functional nanostructures. Date: Wednesday, January 10, 2018 Time: 12:00 P.M. Place: ARMS 1021

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Seminar Notice for Sri Nori, Tuesday, Jan 9, at 10:00 a.m., in EE 224. Exam: same day, at 11:30 a.m., in ARMS 2237. "Three Dimensional Characterization and Modelling of Irradiation Effects in Austenitic Stainless Steels for Nuclear Applications"
by Son, Rosemary E 03 Jan '18

03 Jan '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Three Dimensional Characterization and Modelling of Irradiation Effects in Austenitic Stainless Steels for Nuclear Applications" By Sri Tapaswi Nori Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Maria A. Okuniewski ABSTRACT Austenitic stainless steels have been qualified as structural materials in a nuclear reactor core due to their good high-temperature strength and corrosion resistance. However, the conventional 300 series alloys cannot endure the unusual combinations of high temperatures, neutron radiation dosages and stresses in Gen-IV nuclear reactors. In this context, high temperature ultrafine precipitation strengthened steel (HT-UPS) was developed and is being projected to be suitable for these advanced reactors because of its high temperature creep resistance. However, little is currently known about its radiation tolerance. Neutron irradiation induces defect structures over multiple length and time scales. High-energy X-rays can be employed to study this microstructural and micromechanical evolution under irradiation, as they provide three dimensional and non-destructive characterization. A review on some of these techniques like far-field high-energy diffraction microscopy (FF-HEDM) and near-field high-energy diffraction microscopy (NF-HEDM) will be presented and their application to the study of irradiation effects in HT-UPS at a mesoscale level, will be discussed. Phase field models have emerged as right numerical tools to simulate irradiation effects and these will be briefly introduced. In the context of studying neutron radiation damage response of HT-UPS, both the phase field models and the characterization techniques mentioned earlier will be utilized. Date: Tuesday, January 9, 2018 Time: 10:00 A.M. Place: EE 224

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Seminar Notice for Alexandra Burch, Seminar: Monday, Jan. 8, at 11:00 a.m., in ARMS 3115. Exam 2:00, in ARMS 2237. "Characterization of Molecular Crystals and Identification of Mechanical Mocks Using Nanoindentation"
by Son, Rosemary E 03 Jan '18

03 Jan '18

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Characterization of Molecular Crystals and Identification of Mechanical Mocks Using Nanoindentation" By Alexandra C. Burch Purdue MSE Ph.D. Preliminary Exam Advisor: Professor David F. Bahr ABSTRACT Due to limitations such as the safety and cost of testing energetic materials, particularly explosives, mock materials that are inert and can simulate the mechanical properties of an energetic material may be desired. These mock materials, often found in pharmaceuticals and foods, are often used and tested in the form of small submillimeter sized crystals, with which typical crystal size and geometry make many mechanical tests difficult or impossible. Therefore nanoindentation can be useful in measuring the mechanical properties of these crystals without the need to grow large single crystals or do additional processing on existing crystals. In investigating materials as potential mocks, results of an indentation test that may be useful are hardness, elastic modulus, elastic-plastic response, and indentation fracture. Fracture in particular is not a direct measurement made by nanoindentation, but rather can be deduced by superimposability or lack thereof of indentation unloading traces. Previously, sucrose has been used as a mock material for some energetic materials, notably HMX and RDX, but may not be the most suitable simulate due to its relatively low density and poor thermal stability. Recently, three new materials have been proposed as potential mocks for HMX based on density, crystal structure, and thermal stability: 5-iodo-2'-deoxyuridininine 2, 3, 4, 5, 6 - pentafluorobenzamide, and N,N'- bis (2, 3, 4, 5, 6 -pentafluorophenyl)oxamide. These materials were chosen based on crystal structure, density, and thermal properties, but mechanical similarities to HMX were not tested. It is proposed that minimum mechanical similarity thresholds can be established for declaring a material as a mock; that nanoindentation can be used to identify which of the previously named three materials is the most appropriate mechanical mock for HMX by comparing hardness and elastic modulus values, elastic-plastic behavior, and critical stress to fracture, as well as that the same methods can be applied to other potential explosive-mock systems; that minimum similarity thresholds can be established for what degree of superimposability of indentation unloading curves is indicative of indentation fracture; and that mechanical mocks can be found in molecular crystals that do not share identical crystal structures. Date: Monday, January 8, 2017 Time: 11:00 A.M. Place: ARMS 3115

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ARMS policies
by Donna Bystrom 21 Dec '17

21 Dec '17

Everyone: FYI-----For the holidays the University will be closed December 25th through January 2nd. Staff is expected to report back to work on January 3rd unless vacation has been taken. During this time period the three eastern most doors of the building will remain unlocked. These doors are: next to the loading dock in the back of the building; off of Stadium Avenue, nearest to the elevators; and the door located off of Northwestern Avenue. The rest of the doors will remain locked. Also, I have been asked to send the following message. Apparently, someone is smoking cigarettes in the building. Cigarette butts have been found at the bottom of the east stairwell. The University policy is that smoking is prohibited in any University building. If you see anyone smoking in the building please ask them to step outside. I hope everyone has a wonderful and safe holiday. Donna

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Seminar Reminder for Temitope Aminu's Preliminary Exam: Seminar, Monday, Dec. 18, at 12:00, in ARMS 3115; Exam, same day, at 1:30, in ARMS 3001. " Design and Functionalization of Electrospun Polymeric Membranes with Metal-based Antimicrobial Capacity"
by Son, Rosemary E 15 Dec '17

15 Dec '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Design and Functionalization of Electrospun Polymeric Membranes with Metal-based Antimicrobial Capacity" By Temitope Q. Aminu Purdue MSE Ph.D. Preliminary Exam Advisor: Professor David F. Bahr ABSTRACT The pernicious spread of antimicrobial resistance in pathogenic microorganisms is a growing scourge, creating a virulent mutation of microbes impervious to prevailing treatments. Water, a necessary resource for most biological or physiological functions, is a hospitable habitat for many of these pathogenic microbes, being a medium for transmission to humans. Moreover, the ubiquity of these microbes makes possible water contamination after centralized treatment procedures. Nanoscopic antimicrobial metals are a reemerging disinfecting agent due to their toxic potency against various bacterial strains. Furthermore, polymeric fibers provide suitable anchoring and stability for metallic nanoparticles as well as a robust architecture for water filtration membranes. In light of these properties, incorporating metallic nanoparticles on polymeric fibers engenders functionally exotic composites for use as antimicrobial water treatment. In this review, we will discuss the electrospinning process in light of creating fibrous architectures for filtration membranes. Classically, fiber dimensions and morphology underpin filtration efficiency. This review will delineate factors modulating dimensions of electrospun fibers. In addition, mechanisms of metal-mediated toxicity in microorganisms as well as the expediency of metallic nanomaterials will be discussed. Additionally, the electroless deposition technique for nanoparticle immobilization on electrospun membranes will be discussed. Future research plan will be briefly presented against a backdrop of applicability of these composite membranes. Date: Monday, December 18, 2017 Time: 12:00 P.M. Place: ARMS 3115

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