November 2017 - Msepostdoc-list

Fwd: Amelia's Hours Thanksgiving Week
by Donna Bystrom 17 Nov '17

17 Nov '17

FYI----- Amelia's hours for the week of Thanksgiving: ·November 20 & 21 — 7:30am to 5:00pm ·November 22, 23, 24 — Closed Thanks, Phil Qualio Building Deputy Neil Armstrong Hall of Engineering Potter Engineering Center 765.496.9757 — 765.494.7020

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Seminar Reminder for Seonah Jin's Ph.D. Final Exam, Tomorrow, Friday, Nov. 17, at 1:00, in HAMP 1113. "Development of Biosensor Materials for Sensitive Detection of Viral RNA and Foodborne Pathogen"
by Son, Rosemary E 16 Nov '17

16 Nov '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Development of Biosensor Materials for Sensitive Detection of Viral RNA and Foodborne Pathogen" By Seonah Jin Purdue MSE Ph.D. Final Exam Advisor: Professor Lia A. Stanciu ABSTRACT Pathogen detection for clinical diagnosis, vector surveillance and control is one of the important issues for public health and safety. Biosensing is considered as one of the promising techniques for pathogen detection due to its potential for rapid, simple, and relatively inexpensive detection. However, many biosensors still have limitations for commercialization. Development of materials and new detection methods are the ways to overcome these limitations. This study aims to develop rapid and sensitive material platforms for detection of the dengue viral RNA (Part I and II) and the foodborne pathogen Escherichia coli O157:H7 (Part III). The first part of the presentation will demonstrate the enhanced sensitivity of functionalized graphene oxide wrapped SiO2 particle composite (SiO2@APTES-GO) after primer immobilization for dengue DNA and RNA detection and determines selectivity and a limit of detection (LOD) below 1fM. The enhanced sensitivity is due to the increased surface area resulting from the wrapped structure of the graphene oxide (GO) layer on the silica particles, while maintaining good electrochemical properties. The second part will propose a new method for acceleration of nucleic acid hybridization. The oligonucleotide probe was neutralized by the sodium acetate treatment, which accelerated the hybridization speed and decreased the electrode incubation time from 5 hr to 30 min in low ionic strength solution. The last part of the presentation will demonstrate the sensitivities of gold-polystyrene particles (Au-PS) conjugated to antibodies. The sensitivity depended on the surface coverage and core particle size. Among all investigated conditions, the Au-PS with 0.46 µm diameter core PS, and 10% Au surface coverage showed the best sensitivity, of 5x102 CFU·mL-1 as the LOD for E. coli O157:H7 in both phosphate buffer solution and real food samples including apple juice and ground beef. This optimized surface coverage with gold nanoparticles on the submicron sized particles was the key factor for the sensitivity enhancement of lateral flow strip detection. Date: Friday, November 17, 2017 Time: 1:00 P.M. Place: HAMP 1113

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Seminar Reminderfor Yiwei Sun's Ph.D., Final Exam, Thursday, Nov. 16, at 9:30 a.m., in ARMS 1021
by Son, Rosemary E 15 Nov '17

15 Nov '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Microstructure Evolution in 6XXX and 7XXX Aluminum Alloys During Extrusion and Related Heat Treatments" By Yiwei Sun Purdue MSE Ph.D. Final Exam Advisors: Professors David Johnson and Kevin Trumble ABSTRACT AA6XXX (Al-Mg-Si) and AA7XXX (Al-Zn-Cu-Mg) aluminum alloys are precipitation strengthened alloys with applications in construction, automotive, and aerospace industries. Manufacture procedures for these alloys include casting, homogenization treatment, deformation processing, solutionization treatment and age hardening. The present work focuses on the microstructure development during hot deformation processing (especially extrusion) as well as the related heat treatments including the pre-deformation homogenization and the post-deformation solutionization, with emphasis on phase constituents and grain structure. Extrusion is a shaping process in which the material is pushed through a die forming rods, tubes or complex profiles. For the mid and high strength alloys such as 6061 and 7050, recrystallization is undesired as it is detrimental to the mechanical properties. However, deformation involved in extrusion is highly heterogeneous, making it challenging to completely control the grain structure especially in the surface region. In the current work, a small scale extrusion setup is created, which enables more convenient examination and faster quenching of extrudate and billet discards compared with industrial extrusion. In this way, the dynamic and static microstructure evolution processes are studied separately for a clearer understanding in recrystallization and grain growth behavior of the alloy. On the other hand, recrystallization is significantly influenced by the small concentration of Zr in the alloy, which forms Al3Zr nano-particles to inhibit recrystallization. However, the size, number, spatial distribution and coherency of Al3Zr determine how effective Zr is in grain structure control. Therefore, the role of Zr in grain structure development is also investigated. The current work aims to provide deeper scientific understandings in recrystallization mechanisms and grain growth behavior associated with extrusion and heat treatments and contributes to future optimization of final product grain structure. Date: Thursday, November 16, 2017 Time: 9:30 A.M. Place: ARMS 1021

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Seminar Notice for Christopher McCleary's MS Final Exam, Tuesday, Nov. 21, at 1:00 p.m., in HAMP 2107, "Mechanical Testing of Semi-Solid AL-MG Binary and 7050 Aluminum Alloys Using the Reheating Cooling Method"
by Son, Rosemary E 14 Nov '17

14 Nov '17

MATERIALS ENGINEERING SEMINAR "Mechanical Testing of Semi-Solid AL-MG Binary and 7050 Aluminum Alloys Using the Reheating Cooling Method" By Christopher J. McCleary Purdue MSE MS Final Advisor: Professor David R. Johnson and Matthew J. M. Krane ABSTRACT Elevated temperature tensile testing beyond the non-equilibrium solidus demonstrates the advantage of a new method called the Reheating Cooling Method(RCM) for determining mechanical properties of Al-Mg binary alloys and cast alloy 7050 aluminum in the solid-liquid two phase mushy zone. Using the RCM, it is possible to achieve semi-solid tensile behavior with standard testing equipment and to retain a non-equilibrium casting microstructure, which is necessary to gain insight into hot tearing. Hot tearing, a virtually impossible to repair defect, is known to worsen with increasing Direct Chilled (DC) cast ingot size. Further data gathered from mechanical testing of alloys within the semi-solid mushy zone is necessary to better understand hot tearing and improve ingot production. First, RCM 0.9 fs modulus of toughness results show Al-10%Mg absorbed an average of 240 KJ/m3 while Al-1%Mg an average of 58 KJ/m3. The modulus of toughness at 0.9 fs matches the expected trend seen in hot tearing susceptibility between the two Al-Mg binary alloys. Longer dwell at elevated temperature during heat up is found to decrease an Al-Mg alloy's semi-solid modulus of toughness. Secondly, when above 90% of the non-equilibrium melting point, a basic model of diffusion shows a need for diffusion mitigation. Finally, using 7050 at 0.9 fs, a comparison between the traditional ramp method to the RCM demonstrates an average reduction from 389 KJ/m3 to 10.6 KJ/m3 in modulus of toughness. When compared to the ramp method, the RCM fracture surface contains more evidence of liquid grain boundaries and no sign of plastic deformation, indicating less back diffusion during testing. Increasing strain rate was found to increase specimen modulus of toughness at and above 0.9 fs but lower the modulus of toughness at 0.8 fs. RCM testing shows similarities between the ramp method at 0.9 fs and the mechanical response of the same alloy at 0.95 fs. Date: Tuesday, November 21, 2017 Time: 1:00 P.M. Place: HAMP 2107

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Seminar Notice for Christopher McCleary's MS Final Exam, Tuesday, Nov. 21, at 1:00 p.m., in HAMP 2107, "Mechanical Testing of Semi-Solid AL-MG Binary and 7050 Aluminum Alloys Using the Reheating Cooling Method"
by Son, Rosemary E 14 Nov '17

14 Nov '17

MATERIALS ENGINEERING SEMINAR "Mechanical Testing of Semi-Solid AL-MG Binary and 7050 Aluminum Alloys Using the Reheating Cooling Method" By Christopher J. McCleary Purdue MSE MS Final Advisor: Professor David R. Johnson ABSTRACT Elevated temperature tensile testing beyond the non-equilibrium solidus demonstrates the advantage of a new method called the Reheating Cooling Method(RCM) for determining mechanical properties of Al-Mg binary alloys and cast alloy 7050 aluminum in the solid-liquid two phase mushy zone. Using the RCM, it is possible to achieve semi-solid tensile behavior with standard testing equipment and to retain a non-equilibrium casting microstructure, which is necessary to gain insight into hot tearing. Hot tearing, a virtually impossible to repair defect, is known to worsen with increasing Direct Chilled (DC) cast ingot size. Further data gathered from mechanical testing of alloys within the semi-solid mushy zone is necessary to better understand hot tearing and improve ingot production. First, RCM 0.9 fs modulus of toughness results show Al-10%Mg absorbed an average of 240 KJ/m3 while Al-1%Mg an average of 58 KJ/m3. The modulus of toughness at 0.9 fs matches the expected trend seen in hot tearing susceptibility between the two Al-Mg binary alloys. Longer dwell at elevated temperature during heat up is found to decrease an Al-Mg alloy's semi-solid modulus of toughness. Secondly, when above 90% of the non-equilibrium melting point, a basic model of diffusion shows a need for diffusion mitigation. Finally, using 7050 at 0.9 fs, a comparison between the traditional ramp method to the RCM demonstrates an average reduction from 389 KJ/m3 to 10.6 KJ/m3 in modulus of toughness. When compared to the ramp method, the RCM fracture surface contains more evidence of liquid grain boundaries and no sign of plastic deformation, indicating less back diffusion during testing. Increasing strain rate was found to increase specimen modulus of toughness at and above 0.9 fs but lower the modulus of toughness at 0.8 fs. RCM testing shows similarities between the ramp method at 0.9 fs and the mechanical response of the same alloy at 0.95 fs. Date: Tuesday, November 21, 2017 Time: 1:00 P.M. Place: HAMP 2107

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Seminar Notice for Nelyan López Pérez's Preliminary Exam, Monday, Nov. 20, at 10:30 a.m., in ARMS 1021. "Non-Destructive Method for the Detection of Degradation on Ballistic Fibers"
by Son, Rosemary E 14 Nov '17

14 Nov '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Non-Destructive Method for the Detection of Degradation on Ballistic Fibers" By Nelyan López Pérez Purdue MSE Ph.D. Preliminary Exam Advisor: Professor John A. Howarter ABSTRACT Ensuring the performance and safety of body armors during service is crucial for institutions such as the United States National Institute of Justice (NIJ). The NIJ's commitment to safety prompts the research of the degradation of high performance fibers like Kevlar, Twaron and Dyneema. Degradation, the reduction of the mechanical properties such as strength and toughness, occurs when a material is exposed to various common environmental factors like sweat, humidity, temperature and sunlight. Currently, the effects of water and pH are studied in Twaron fibers. The amount of water and its effects on their mechanical properties are tested through tensile testing and dynamic mechanical analysis (DMA). However, early stages of degradation can be detected using a technique called positron annihilation lifetime spectroscopy (PALS), which measures the dimensions of free volume in polymers. As the fibers degrade, the dimensions of the free volume change. Hence, PALS can then be used as a complementary technique to the previously mention mechanical tests. Comparing the changes in free volume to those in the mechanical properties gives a broader understanding of the degradation process and rate for high performance fibers, and can later be implemented for the lifetime prediction of new and used body armors. Date: Monday, November 20, 2017 Time: 10:30 A.M. Place: ARMS 1021

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Seminar Notice for Tae Hoo Chang's Preliminary Exam, Tuesday, Nov. 21, 8:30 a.m., in ARMS 1021. " Fabrication of Aptamer Sensors Using by Plasmonically Engineered Nanoprobes"
by Son, Rosemary E 14 Nov '17

14 Nov '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Fabrication of Aptamer Sensors Using by Plasmonically Engineered Nanoprobes" By Tae Hoo Chang Purdue MSE Ph.D. Preliminary Exam Advisor: Professors Alexander Wei and Lia A. Stanciu ABSTRACT As society is getting complicated and developed, people are easily stressed out. Cortisol is a well-known stress indicator hormone. Balancing this hormone in daily life is very important because it affects all our body such as metabolism, blood pressure, and physiological processes. Abnormal elevation of this hormone can be a cause of Cushing's syndrome and kidney disease. Hence, the detection of cortisol level in the body can be a key way to prevent related diseases. To detect cortisol level, we need to take cortisol from different sources. The best source for collecting cortisol is urine or saliva because of the requirement of 24 hour sample collection and non-invasive methods. However, these sources have limited amount of cortisol concentration. Therefore, a new highly sensitive nanosensor with low detection limits is needed. In this work, I will review the trends of cortisol sensors at first. Then, I will suggest a noble sensor platform called "Nano-brightener" sensor. This sensor platform has many benefits such as low cost, easy to sensing and non-invasive detection in urine. Moreover, the strongest point is that this sensor is suitable for the point-of-care monitoring systems because this sensor will be compatible with smart phone camera at the end of this project. This cortisol sensor composes four components: silver nanoparticle (AgNP), DNA aptamers, transducer core, and fluorescent dye. By using plasmon resonant AgNPs, the fluorescent dye can turn on/off due to the metal-enhanced fluorescence (MEF) effect. We will discuss not only the submerged fundamental principles of this aptamer sensor but also the roll of each component and how to fabricate it. At the end of presentation, preliminary results and future plans will be introduced. Date: Tuesday, November 21, 2017 Time: 8:30 A.M. Place: ARMS 1021

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Seminar Reminder for Armen Yildirim's Preliminary Exam, Tuesday, Nov. 14, 12:30 in HAMP 2107. " PZT based "Z" Aligned Piezoelectric Polymer Materials for Pressure Sensor and Energy Harvesting Applications"
by Son, Rosemary E 13 Nov '17

13 Nov '17

Please consider attending the following: Note the change of place. Seminar is in HAMP 2107 at 12:30 MATERIALS ENGINEERING SEMINAR "PZT based "Z" Aligned Piezoelectric Polymer Materials for Pressure Sensor and Energy Harvesting Applications" By Armen Yildirim Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Mukerrem Cakmak ABSTRACT Recently, the potential impacts of wearable technologies have become more evident with the introduction of the "Internet of Things" (IoT), which can basically be described as a smart network where every electronic device is connected to each other through embedded sensors and the internet. As a result, there is an increasing demand for the use of flexible, ultra-lightweight and transparent sensors and nanogenerators for self-powered electronics in several areas such as personal health monitoring, soft robotics, human inspired electronic skin (e-skin), energy harvesting and biomedical applications. In this work, we report a novel approach to produce high performance, flexible and transparent PZT/Graphene based ultra-sensitive pressure sensors and nanogenerators where particles are aligned under an AC electric field in the thickness ("Z") direction. With the E-field alignment method, the amount of particles required to develop a piezoelectric polymer material is greatly reduced. As a result, the transparency is maintained for desired applications such as touch screen interfaces. On the other hand, this method will also be the first of its kind for flexible nanogenerators and pressure sensors that is fully compatible with a continuous large-scale roll-to-roll (R2R) production line which is also designed and developed by our group. Date: Tuesday, November 14, 2017 Time: 12:30 P.M. Place: HAMP 2107

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Seminar Reminder for Jason Bice's MS Final Exam, Tuesday, Nov. 14, at 12:30 in HAMP 2118; "Ultrasonic Speckle Velocimetry: The Ability to Quantify Velocity Profiles in a Couette Geometry"
by Son, Rosemary E 13 Nov '17

13 Nov '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Ultrasonic Speckle Velocimetry: The Ability to Quantify Velocity Profiles in a Couette Geometry" By Jason E. Bice Purdue MSE MS Final Exam Advisor: Professor Kendra A. Erk ABSTRACT Rheometry is a leading technology used to define material properties of multi-phase viscoelastic fluid-like materials, such as the shear modulus and viscosity. However, traditional rheometry relies on a mechanical response from a rotating or oscillating rotor of various geometries which does not allow for any spatial or temporal quantification of the material characteristics. Further, the setup operates under the assumption of a uniform and homogenous flow. Thus, only qualitative deductions can be realized when a complex fluid displays inhomogeneous behavior, such as wall slip or shear banding. Due to this lack of capability, non-intrusive imaging is required to define and quantify behavior that occurs in a complex fluid under shear conditions. This thesis outlines the design, fabrication, and experimental examples of an adapted ultrasonic speckle velocimetry device, which enables spatial and temporal resolution of inhomogeneous fluid behavior using ultrasound acoustics. For the experimental example, a commercial surfactant mixture (hair shampoo) was tested to show the utility and precision that Ultrasonic Speckle Velocimetry possesses. Date: Tuesday, November 14, 2017 Time: 12:30 P.M. Place: HAMP 2118

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CANCELLED TODAY Seminar Reminder for Daniela Betancourt Jimenez's Preliminary Exam, Nov. 13, at 1:30, in ARMS B071, "Phase Change Materials as Temperature Regulators in Asphalt Pavement"
by Son, Rosemary E 13 Nov '17

13 Nov '17

Hi All, This has been cancelled today. It will be rescheduled another day. Thank you for your consideration. From: Son, Rosemary E Sent: Monday, November 13, 2017 10:09 AM To: 'msefaculty-list(a)ecn.purdue.edu' <msefaculty-list(a)ecn.purdue.edu>; 'msegradstudent-list(a)ecn.purdue.edu' <msegradstudent-list(a)ecn.purdue.edu>; 'msepostdoc-list(a)ecn.purdue.edu' <msepostdoc-list(a)ecn.purdue.edu> Cc: 'Daniela Betancourt Jimenez' <dbetanc(a)purdue.edu>; Haddock, John E <jhaddock(a)purdue.edu>; Cline, Vicki L. <vicline(a)purdue.edu>; Son, Rosemary E <son39(a)purdue.edu> Subject: Seminar Reminder for Daniela Betancourt Jimenez's Preliminary Exam, TODAY, Nov. 13, at 1:30, in ARMS B071, "Phase Change Materials as Temperature Regulators in Asphalt Pavement" Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Phase Change Materials as Temperature Regulators in Asphalt Pavement" By Daniela Betancourt Jimenez Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Carlos J. Martinez ABSTRACT Asphalt pavement constitute the building material for approximately 95% of the roads in the United States. However, due to the viscoelastic nature of the binder, the performance of the asphalt can be dramatically affected by extreme temperatures. The integration of phase change materials (PCMs) has been proven to be a feasible and effective way to regulate the temperature in other building materials and it's currently being investigated for asphalt applications. This report summarizes the main approaches studied for the incorporation of PCM systems in asphalt pavement materials and some of the challenges encountered in the process. It also proposes the use of a new technique for PCM microencapsulation that is believed will help overcome the problems associated with PCM encapsulation such as supercooling, low thermal conductivity and PCM leaking. It is believed that this new method will provide a viable solution to reduce asphalt distresses and delay the ice formation and snow accumulation during the winter season. Date: Monday, November 13, 2017 Time: 1:30 P.M. Place: ARMS B071

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