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Voiland College of Engineering and Architecture Voiland College of Engineering and Architecture

MME Seminar Series Welcomes: Daicheng Fu, SEL Pullman

11:00 – 12:00 noon in ETRL 101

Refreshments served in ETRL 119 at 10:30 am

Daicheng Fu

Process Engineering Operations ManagerSchweitzer Engineering Laboratories

Abstract

This study is to evaluate different process combinations to solder Pb-free BGA under SnPb solder environment. Four variables are included in the full factorial experiment design, PCB finish type, paste/flux type, BGA ball composition and BGA package type. An elevated temperature reflow profile is used for all test groups. Thermal cycling and board bending tests are performed.

Results show when HASL finish is used, all mixed soldered Pb-free BGA with SnPb solder paste are able to sustain at least 1,000 thermal cycles. There are early failures before 100 cycles, they are all from ENIG finish boards. The cause of early failures is insufficient formation of inter-metallic compound on the interface between ENIG finish and mass solder. Board bending test also shows much higher percentage of open circuits on ENIG finishing boards.

This study finds the best process combination for Pb-free BGA is HASL finish with PBGA packages. SnPb paste or flux-only does not make significant difference. CSP type packages and low Ag content Pb-free alloy are generally less reliable than PBGA package with SAC305/405 alloy, but as long as HASL finish boards are used, there are no early thermal cycle failures.

 

Biography

Daicheng Fu is a Process Engineering Operations Manager with Schweitzer Engineering Laboratories in Pullman, WA. He received his M.S in Industrial Engineering from Arizona State University and B.S in Mechanical Engineering from Shanghai Jiao Tong University. He has over twenty years of experience in electronics manufacturing, in both consumer   electronics and high-reliability industrial control equipment. In SEL, Daicheng Fu has led several in-depth studies on quality and reliability issues, such as backward-compatibility issue with lead-free components in tin-lead soldering environment; component latent damage caused by board bending stress; tin whisker issue and prevention on lead-free components; and silver dendrite issue and prevention. Currently Daicheng Fu is leading SEL’s process engineering team in new process development; soldering material evaluation; New Product Introduction; and Design for Manufacturability improvement.

 

MME Seminar Series Welcomes: Professor Anil V. Virkar, University of Utah

Refreshments in ETRL- 10:30-11:00

Dr. Anil V. Virkar, Distinguished Professor

University of Utah, Department of Materials Science & Engineering

 

Transport-Induced Failure of Electrochemical Devices: Batteries and Electrolyzers

 

Abstract

Many electrochemical devices such as batteries, fuel cells, electrolyzers, etc. degrade over time and under various operating conditions. In batteries containing series-connected cells, degradation often occurs if one or more cells exhibit different characteristics than the rest of the cells. Also, batteries are more prone to degradation during charging. Problems with laptop batteries are well known. Fuel cells (especially stacks) also undergo degradation during operation. There is considerable literature on solid oxide electrolyzers, which too degrade under certain operating conditions. Degradation in these devices may manifest as increase in resistance, loss of capacity, or both. In some instances, complete electrode delamination has been observed. In some cases, electrolyte instability may occur. In lithium-ion batteries, lithium dendrites can form. While there are several reasons for degradation, the observation that many electrochemical devices degrade suggests that there may be a common underlying reason which is applicable to all such electrochemical systems. This talk is on the degradation of such electrochemical devices which can occur under transport. A key conclusion is that the chemical potential of an electrically neutral species within the electrolyte corresponding to the mobile ion, may lie outside the range covered by the values at the electrodes (reservoirs), and this can lead to transport-induced instability. Specific examples of solid oxide electrolyzers and lithium ion batteries will be addressed.

Biography

Anil Virkar is Distinguished Professor and H. Kent Bowen Endowed Chair in the Department of Materials Science & Engineering at the University of Utah. He is a cofounder of Versa Power Systems, (VPS) (www.versa-power.com), a Colorado-based company with operations in Calgary (later acquired by FuelCell Energy). He was also a founding member of Ceramatec, Inc., a small company based in Salt Lake City, Utah, now a subsidiary of CoorsTek. He received B.Tech. (Hons.) in Metallurgical Engineering from Indian Institute of Technology, Mumbai, India (1967); M.S. in Engineering Mechanics from Louisiana State University in (1969); and Ph.D. from Northwestern University in Materials Science in (1973). His research is in fuel cells, batteries, multi-species transport and the role of non-equilibrium thermodynamics in the stability of electrochemical devices. His early work was on fabrication of ceramics (oxides and non-oxides), phase transformation mechanisms and kinetics, and fracture mechanics. He has to date published over 250 refereed papers and has more than 40 patents to his credit. He has supervised PhD and MS research of over 50 candidates to date. His current funding is primarily from DOE and NSF.

Boeing Career Development Lecture Series

Boeing’s Justin Obrien will visit the WSU campus as a speaker. The topic will be The Future …Today.

Justin is a Middle Eastern and Africa Country Manager in the International Strategic Partnerships organization. In this role leads the development and implementation of industry strategies that drive Boeing’s international growth objectives. This includes supporting sales campaigns with compelling industry strategies and forming enduring international partnerships.

Prior to his current assignment, Justin was a Procurement Agent on the Airborne Warning and Control Programs where he was responsible negotiating and managing tier 1 supplier contracts. Justin joined Boeing as an analyst in Phantom Works Finance after graduating from Washington State University with a degree in Operations Management. Later he earned a Master of Science in Finance from Seattle University.

Much appreciation to Justin for taking time to help us learn about burgeoning competitive markets to traditional commercial flight (also known as Horizon-X)

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Week of Women in STEM, April 2-5, 2018

The Week of Women in STEM is designed to provide inspiration and professional development by bringing professionals and students together for networking and mentoring. A special showing on April 2, 8-10 p.m., of the acclaimed movie, “Hidden Figures” will kick off the week, followed by a keynote speech by Gerri Martin-Flickinger, Executive Vice President and Chief Technology Officer of Starbucks April 3, and a unique STEM panel discussion and dinner on April 4. The week’s events will include in a formal dinner with a scientist/engineer for students and industry alumni. On Thursday, April 5th, the American Association of University Women will present two salary negotiation workshops. » More ...

MME Seminar Series Welcomes Dr. Xiao-Ying Yu, Pacific Northwest National Laboratory

Held in ETRL 101

Refreshments served in ETRL 119 at 10:30 am

Dr. Xiao-Ying Yu

Earth and Biological Sciences Directorate, PNNL

Chemical Mapping of the Evolving Material Interface in Liquids

Abstract

A vacuum compatible microfluidic reactor, SALVI (System for Analysis at the Liquid Vacuum Interface) was employed to study the evolving material interface of particles in liquids.  Three case studies will be provided in this talk.  The first study is a model switchable ionic liquid (SWIL) system consisting of 1,8-diazabicycloundec-7-ene (DBU) and 1-hexanol. When CO2 gas is added to the DBU and 1-hexanol mixture, the solvent polarity is known to change. A series of ionic liquids with different CO2 loading was analyzed. Spatial chemical differences were observed within the same ionic liquid, indicating  Inhomogeneity of the ionic liquid. Spectral principal component analysis (PCA) was conducted. Clear distinctions were   observed among SWILs with different CO2 loadings. The loading plots strongly indicate that fully loaded SWILs share similar spectral components as those of the non-loaded ILs. This finding confirms the      hypothesis of the biphasic structure in the fully loaded IL   predicated by molecular dynamic simulation and presents the first physical evidence of the liquid microenvironment of IL determined by liquid ToF-SIMS. Second, we           investigated the chemical structural evolution of the metal organic framework (MOF) formed over different lengths of times using in situ liquid SIMS imaging.  Zn-MOF-74 is the model system.  Zn-acetate is the metal center and DHTA is the ligand linker in a DMF solvent.  MOFs in solvent are analyzed to ascertain the growth mechanism and the   evolution of the MOF structure.  Ex situ XRD, HeIM, and TEM are used to     characterize MOFs to complement the in situ analysis.  MOF surface area measurement and adsorption and desorption testing illustrate that the MOF pore size    becomes smaller over time yet the overall adsorption/desorption properties  mprove due to the increased density of the pores.  Lastly, large colloidal boehmite particles of importance in nuclear engineering and   processing are studied under a variety of pH conditions.  Particle morphological changes are observed using in situ liquid SEM.  Moreover, the solvent and solute compositions are found to relate to the pH conditions, providing direct evidence of the solvation effect via submicron chemical mapping.  The vacuum compatible microchannel in SALVI offers an    Innovative perspective to study the evolving liquid-liquid and solid-liquid   interface.  This approach allows direct visualization of the spatial and chemical heterogeneity in complex liquids by dynamic ToF-SIMS complemented with other imaging and spectroscopy techniques and provides new insights for improved understanding of the evolving material interface.

Biography

Dr. Yu was trained as a physical chemist and kineticist at the University of Michigan, Ann Arbor, MI. She did her postdoctoral research at Brookhaven National Laboratory and Colorado State University.  She has been a senior scientist at Pacific Northwest National Laboratory since 2006.  She has led the development of a novel mesoscale imaging tool based on microfluidics at PNNL since 2009, which has resulted in three patents, a prestigious R&D 100 award, and a Federal Laboratory Consortium Technology Transfer Excellence Award.  She has developed new concepts in aerosol sampling, led and participated in many field studies for in situ      measurements of aerosols.  Dr. Yu is the chair of the DOE chemical exposure working group; and leads the development of the chemical mixture methodology (CMM) for consequence assessment of toxic health effects since 2008.  She was a member to the DOE Temporary Emergency Exposure Limit (TEEL) Advisory Group (TAG).  Her recent research focuses on in situ mesoscale chemical imaging of soft materials in atmospheric, biology, energy, and material  sciences using microfluidics.

 

 

MME Seminar Series Welcomes Professor David A Weitz, Harvard University

Held in ETRL 101, Refreshments in ETRL 119 10:30-11:00

Professor David A. Weitz

School of Engineering & Applied Sciences, Harvard University

Dripping, Jetting, Drops and Wetting: The Magic of Microfluidics

Abstract

This talk will discuss the use of microfluidic devices to precisely control the flow and mixing of fluids to make drops and will explore a variety of uses of these drops. They can be used to create new materials that are difficult to synthesize with any other method.  These materials exhibit fascinating physical properties and have great potential for practical uses.

Biography

Weitz received his PhD in physics from Harvard University and then joined Exxon Research and Engineering Company, where he worked for nearly 18 years.  He then became a professor of   physics at the University of Pennsylvania and moved to Harvard at the end of the last millennium as professor of physics and applied physics.  He leads a group studying soft matter science with a focus on materials science, biophysics and microfluidics.  He has co-founded several companies to commercialize some of the microfluidics work developed in his lab. He is a member of the National Academy of Sciences (NAS) and National Academy of   Engineering (NAE).

 

 

MME Seminar Series Welcomes Dr. Subhanshu Gupta, WSU EECS

Dr. Subhanshu Gupta, Assistant Professor

Washington State University
School of Electrical Engineering and Computer Science

 

Held in ETRL , Refreshments served in ETRL 119 at 10:30 am

Persistent Sensing using ultra-low-power sub-cubic-millimeter devices for Biosensor Interfaces and Heterogeneous Networks

Abstract

Ubiquitous sensor arrays in ecosystems surrounding us have created an interesting conundrum, i.e. the design of these ecosystems and for that matter even electronic circuits for the worst-case variations have resulted in huge cost overruns and inefficiencies with economy-of-scale. This talk will focus on two systems currently being researched at Systems-On-Chip (SoC) Lab at Washington State University that enables efficient integration and implementation of multi-sensor arrays. The first system will describe a multi-channel sensor array for human vital signs monitoring. A mixture of disruptive technologies from signal processing and information theory, circuit design, nanofibers and additive printing are discussed towards achieving a unified goal of a flexible and reconfigurable vital signs sensor for different biometrics. Applications of sub-Nyquist sampling techniques and additively printed touch sensors for measurement of human electrocardiogram will be demonstrated. The second system will describe a combination of piezo-sensor and radio-frequency phenomenon to capture facial muscular movements in preemies. We will conclude the talk with future directions and open research challenges towards an efficient energy-harvested printed sensor array with integrated RF communications.

Biography

Subhanshu Gupta is a faculty in School of Electrical Engineering and Computer Sciences at Washington State University, Pullman. He received his Ph.D. from the University of Washington, Seattle, WA, USA in 2011 He was with the RFIC/Mixed Signal group at Maxlinear from 2011-14 where he worked on silicon driven circuits and systems for broadband transceivers used in cable/satellite/infrastructure communication applications. From 2015, he has been an Assistant Professor of Electrical Engineering at Washington State University where he is supervising over Systems-on-Chip Lab. His current research interests include energy-efficient integrated circuits (IC) and systems for millimeter-wave communication and persistent sensing using information-aware signal processing for long-term monitoring.

Boeing Career Development Lecture Series

Boeing’s Christin Datz will visit the WSU campus as a speaker. The topic will be Eco Demonstration.

Christin is the Material Sustainability Leader for Boeing Commercial Airplanes, tasked with reducing the environmental footprint of Boeing’s products throughout their lifecycle. She has contributed to the aerospace industry for over ten years in various capacities as a mechanical engineer and holds degrees in physics and mechanical engineering as well as a Master’s degree in sustainable transportation. Christin’s professional and academic interests intersect in her efforts to further sustainable technology development in the field of engineering and beyond.

This event is open to all students.

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Meeting number: 894 544 269
Meeting password: WSUboeing1234

Join from a video conferencing system or application
Dial 894544269@boeing.webex.com

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+1-425-943-7320 U.S. NW
1-888-787-5387 U.S Toll Free-high cost
Access code: 894 544 269
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