Beneath the AVS Surface Member News & Updates |
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By Ivan Petrov, Fred Dylla, Steve Rossnagel, Tim Gessert, Yvonne Towse, Della Miller
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Our friend, colleague, and AVS leader, Joe Greene passed away on October 10, 2022.
Joe Greene, born in Arcata, California, was a professor of Materials Science and Physics at the University of Illinois at Urbana-Champaign. He also held professorships at Linköping University (Sweden) and at the National Taiwan University of Science and Technology (Taiwan).
Joe Greene's career has spanned more than five decades and during that time his scientific output has consisted of over 625 research and review articles, 29 book chapters, four co-edited books, 525 invited talks, and 140 plenary lectures. He is widely recognized as one of the pillars of the thin film physics, surface science, and surface engineering communities.
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Professor Joe Greene
Nov. 25, 1944 - Oct.10, 2022
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The overarching philosophy of his science was the development of atomic-level understanding of adatom/surface interactions during the dynamic process of vapor-phase crystal growth. This knowledge enabled controllable manipulation of nanochemistry, nanostructure, and, hence, physical properties. In particular, he used hyperthermal condensing species and UV photochemistry to probe and stimulate surface reactions that do not proceed thermally. With this approach he created novel epitaxial metastable materials with application in both the semiconductor and hard coatings industries. His work focused on the nanoscience and film growth by all forms of sputter deposition systems, solid and gas-source molecular beam epitaxy, ultrahigh-vacuum chemical vapor deposition, metal-organic chemical vapor deposition, and atomic-layer epitaxy (ALE).
Early in his career he developed a new class of metastable semiconducting alloys, which have come to be known as "Greene alloys". In addition, his work on the development of Si atomic layer epitaxy, including mapping the basic surface science of Si ALE, are considered seminal contributions in that field and the real-world application of these studies has since been implemented by electronic companies world-wide.
Greene and his research team conducted the first systematic study of the effects of the ion/metal flux ratio and ion energy on microstructure evolution in hard coatings. Their determinations of the properties of this class of materials are considered reference standards in the field. In 2001, his research on “extending the science of transition metal nitrides” was cited by the U.S. Department of Energy’s Office of Basic Energy Sciences as one of the most important scientific discoveries they had supported.
Joe Greene also had outstanding accomplishments as a teacher and mentor. He has supervised over 70 PhD students mainly at the University of Illinois, but also at Linkoping University and the National Taiwan University of Science and Technology. He has hosted over a 100 visiting scientists and post-doctoral researchers. Joe received the 1998 Aristotle Mentor Award from Semiconductor Research Consortium as well as the Society of Vacuum Coaters (SVC) Mentor Award (2015). Joe was one of the most prolific and sought-after AVS short-course instructors. He taught short courses on thin film physics, surface and nanoscience, attended by thousands of scientists and engineers around the globe from industry and academia. Joe’s students have won over 40 major society awards at the AVS International symposium, the International Conference of Metallurgical Coatings and Thin Films (ICMCTF), the Materials Research Society (MRS), and American Physical Society (APS). Joe generously supported the careers of his students and collaborators with valuable advice, recommendation letters, and award nominations. There is a whole cohort of scientists who came out of Joe’s school who are now leaders in their own right in academia and industry.
Joe received numerous awards, including the major awards of APS, MRS, AVS, and SVC. He was a Fellow of AVS, APS, and MRS, an elected Member of the US National Academy of Engineering in 2003 for “pioneering studies in the synthesis and characterization of epitaxial and highly ordered polycrystalline materials.” He was awarded the AVS John A. Thornton Prize for "Outstanding Research in Thin Film Science" from AVS in 1991 and received the Tage Erlander Award from the Swedish Natural Science Research Council. In addition, Professor Greene received a lifetime achievement award from the Taiwan Association for Coating and Thin Film Technology. Joe’s passion for history of science led him, in recent years, to publish a series of scholarly articles on the recorded history of sputter deposition, organic thin films, and inorganic thin films. This series was acknowledged by naming him the 2016-7 George Sarton Chair of the History of Science at Ghent University, Ghent, Belgium. In September 2022, Joe was awarded the Jan Czochralski Award and Gold Medal by the European Materials Research Society in recognition and acknowledgement for his Lifetime Achievements in Materials Science.
Joe Greene was Editor-in-Chief of Thin Solid Films for 31 years and past Editor of CRC Critical Reviews in Solid State and Materials Sciences. Joe was an unsurpassed writer with a style that was characterized by logic, conciseness, and elegance. As the Director of the Frederick Seitz Materials Research Laboratory at the University of Illinois, he elevated the research program to new heights, including building its Center for Microanalysis of Materials as a prominent National User Facility.
Joe´s contribution to societies and his service to the scientific community are legendary. AVS was the home for Joe where his visionary leadership activity has contributed significantly to making it the international society in the field of vacuum-based science and technology. He served as AVS President (1989), Trustee and Chair (1978-1979), Director (1984-1985), Long Range Planning Chair (1990-1994), TFD Chair (1985), ASED Chair (2007, 2014), AVS Clerk for 22 years (1997-2019). Joe Greene has been involved in IUVSTA since 1986, where he chaired the TFD (1989-1992), the Education committee (1992-2001), and the Emerging Societies Committee (2010-2019). He was the USA councilor from 2004 to 2020.
He served for decades in leading roles in the Advanced Surface Engineering Division (ASED) of the AVS and its major conference ICMCTF. He helped develop ICMCTF to be the premier international event in the field. His impact on this annual meeting and his ability to educate attendees in the spirit of cooperation and friendship have made ICMCTF and San Diego the home of generations of colleagues from academia, governmental institutions, and industry. In 2019, the ICMCTF community awarded him the Bunshah Award, the highest ASED recognition, for his lifetime achievements.
Joe was an avid mountaineer, Telemark skier, and volunteer Search and Rescue Ranger at the Grand Teton National Park.
Joe is survived by his wonderful wife and trusted partner of 54 years, Phyllis.
Joe’s legacy is a lasting one; he will always be in our hearts, and in our thoughts.
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Call for AVS Committee Volunteers |
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Introducing DEI: Commitment to the Future of AVS
For many years the AVS divisions took on the charge to build a diverse community and integrated these goals in the selection of invited speakers and the election of division and focus topic committee members. But the question raised was, “Is this enough? How can we integrate diversity, equity, and inclusion to shape the future of AVS and build a thriving community which advances our scientific mission?” This motivated us to develop a fabric woven through all aspects of the AVS community, rather than rely solely on the activities of individual committees and members. Ideally, in a few years’ time, we will have succeeded to make AVS’ diversity statement a reality: “Scientific and engineering innovation requires bringing together both diverse ideas and people from varied backgrounds who may have different world views and ways of solving problems.”
The DEI Committee was nucleated half a decade ago and has since grown into a stand-alone committee. Erica Douglas currently serves as chair with co-chair Stefan Zollner and full support from the AVS board of directors. AVS now works collectively to integrate DEI into all parts of its operations, from organizing teams to divisions, exhibition presenters to meeting participants.
The Committee recently held several listening sessions to understand needs and goals from members, which has grown into an AIP supported member questionnaire to probe deeper and feel the “Pulse of AVS”. The extensive survey was distributed to all AVS members in early October, targeting to end December 2. We hope for a stellar return rate so we can appropriately develop new goals in the areas that impact our members the most!
Stay current with the DEI activities on the AVS Website and social media. Current members are Erica Douglas, Sandia National Laboratories; Chair, Stefan Zollner, New Mexico State University; Co-Chair Elect, Sean L. Jones, National Science Foundation; Svitlana Pylypenko, Colorado School of Mines; Talat Rahman, University of Central Florida; Petra Reinke, University of Virginia; Mauro Sardela, University of Illinois at Urbana-Champaign; Dan Killelea, Loyola University Chicago.
We have room for more enthusiastic volunteers. Please join us in this effort by e-mailing erica_douglas@avs.org.
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AIP Benefits to AVS Members |
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AVS is a long-standing member of the American Institute of Physics (AIP), a federation of 10 scientific Member Societies representing a broad spectrum of the physical sciences.
But, how do you as an individual AVS member benefit from AVS’s association with AIP?
You receive monthly issues of Physics Today, the most widely read physics magazine in the world. AIP operates the AVS Career Center, helping enhance employment opportunities in the materials, interfaces, and processing fields. AVS members are invited to apply for paid AIP Science Policy Fellowships to work in Congress or the U.S. State Department. AIP’s subsidiary, AIP Publishing, publishes AVS’s journals. And, AIP’s news and media team draws attention to AVS research through products like Scilights, written to intrigue a broad audience. So, whether you’re trying to advance your career, showcase your research, or stay connected to developments throughout the physical sciences, AIP’s resources can help you.
As an independent institute, where research connects you to the past, present, and future of the physical sciences, AIP runs the Center for History of Physics and maintains archives on AVS’s history as part of its Niels Bohr Library & Archives. AIP’s federal science policy reporting in FYI: Science Policy News reveals how federal actions impact the physical sciences enterprise. AIP’s Statistical Research team produces the most complete view of the demographics and career outcomes of the physics community, helping illustrate the opportunities available to physical scientists.
AIP is also partnering with Member Societies on TEAM-UP Together, a collective action initiative of the AIP federation that aims to double the number of African American students earning physics and astronomy bachelor’s degrees annually by 2030. This program addresses long-term systemic issues within the physics and astronomy communities that contribute to the underrepresentation of African Americans in these fields.
More generally, AIP provides the means for its Member Societies to pool, coordinate, and leverage their diverse expertise and contributions in the pursuit of the shared goal of advancing the physical sciences in the research enterprise, in the economy, in education, and in society. Through their partnership in AIP, Member Societies broaden their impact and achieve results beyond their individual missions and mandates. Together, AIP and its Member Societies convey a unifying message for stakeholders in government, academia, the nonprofit and private sectors, the student and teacher communities, and the general public.
AIP is proud of its decades-long relationship with AVS in support of the interdisciplinary community AVS brings together.
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International Interactions |
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CBrAVIC Conference Update - August 2022, Sorocaba, Brazil |
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By Dan Killelea, Loyola University Chicago
I had the honor of being the AVS representative to the XLIII Brazilian Congress of Vacuum Applications in Industry and Science (Congresso Brasileiro de Aplicações de Vácuo na Indústria e na Ciência, CBrAVIC) in Sorocaba, São Paulo State, Brazil from 8-12 August, 2022. This was a five-day event with 1.5 days of short courses and classes and 2.5 days of scientific presentations. The final day had a few different events, including the society business meeting and a panel discussion and talks about the current state of plasma science in Brazil. There were also several poster sessions each day before and after the talks. The schedule gave a good amount of time for informal discussions over coffee breaks and meals. A highlight of the conference was the brewery ‘tour’, complete with a buffet dinner and a live band on Wednesday evening. The chair of the conference was Luciana Rossino from The Paula Souza State Center for Technological Education in Sorocaba (CETEPS). Luciana and the rest of the organizers did a fabulous job, there was strong turn out, a robust program, and the presenters and attendees lively.
It was a pleasure to represent the AVS at the meeting. I was able to meet the current Sociedade Brasileira de Vácuo (SBV) president, Nazir Monteiro (CETEPS – Itaquera), as well as a few of the past presidents. I am very grateful for my host, guide, and companion, Pedro Nascente. Pedro was very kind and welcoming, getting me around and introducing me to everyone. From what I hear, Pedro has long been a key person in the relationship between the AVS and SBV, and he may know a couple people involved with AVS.
The conference was held outside the city in the new Parque Tecnológico de Sorocaba, with ample exhibit space and lecture hall. There were ≈100 attendees, primarily from Brazil, at the meeting. A majority were students, indicative of the vibrancy of the SBV and the significant number of universities in the area. For example, The State University of Campinas, The Federal University of Sao Carlos, The University of Sao Paulo, and Sao Paulo State University (Sorocaba, Bauru, and others), among others, were represented. I was invited to give a Palestra Magna entitled ”Chemical Speciation and Structural Evolution of Rhodium and Silver Surfaces with High Oxygen Coverages”, and used the opportunity to promote AVS and acknowledge the long-standing relationship between the AVS and SBV.
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(Clockwise from Top Left) Dan, SBV President Nazir Monteiro,and Pedro Nascente; Adriana Delgado (UFSCar – Campus Sorocaba), Pedro, Nazir, and Dan; Nazir and Luciana Rossino; Luciana Rossino at the conference short courses. |
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Taking Advantage of Low Temperature Reactions for Selective Etching |
Authors: G. Antoun, T. Tillocher, A. Girard, P. Lefaucheux, J. Faguet, H. Kim, D. Zhang, M. Wang, K. Maekawa, C. Cardinaud, and R. Dussart
Publication: "Cryogenic nanoscale etching of silicon nitride selectively to silicon by alternating SiF4/O2 and Ar plasmas", JVST A, Vol. 40, No. 5, Sept/Oct 2022
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Cooling the substrate to below minus 65 degrees Celsius triggers unique reactions that can be used to etch silicon nitride, leaving silicon untouched.
Atomic layer etching (ALE) is a method to manufacture chip devices, typically in silicon, for use in computers and electronics. The goal is to selectively remove — or etch — specific layers of material to create desired patterns. One of the challenges is reactor wall contamination, where chemicals from one step of the etching process can bind with the reactor wall and desorb to react again with chemicals from a later stage.
Cooling the substrate to low temperatures can reduce reactor wall contamination in a process called Cryo-ALE. Because different chemicals have different temperature profiles, it is possible to select chemicals and temperature regions to achieve etching selectivity and minimize unwanted reactions.
In the AVS Journal of Vacuum Science & Technology A, researchers from Orléans University, Nantes Université, Tokyo Electron America, and TEL Technology Center, America produced measurements of Cryo-ALE etching and deposition with SiF4/O2 plasma on amorphous silicon and silicon nitride using X-ray photoelectron spectroscopy.
They found that at temperatures below minus 65 degrees Celsius, the composition of the deposited layer changed. Lower temperatures would increase the physisorption of fluorinated compounds at the surface layer.
“At an even lower temperature, like minus 100 degrees Celsius, we observe a very high concentration of fluorine at the surface, which is something that we don't observe at a higher temperature like minus 40 degrees Celsius,” said author Rémi Dussart.
The authors used this high fluorine concentration to develop an etching method. By first depositing a fluorinated layer and then exposing that layer to an argon plasma, they trigger an etching reaction on the substrate. Due to the nature of the interaction around the critical temperature of minus 65 degrees Celsius, the temperature controls whether material is deposited or etched away.
“What we observe is that we can have a deposition regime at 20 degrees Celsius, for example, and at low temperature, we can switch to an etching regime,” said Dussart. “And this is what we have at minus 85 and minus 100 degrees Celsius.”
Crucially, the temperature dependence of the etching reaction is different for silicon and silicon nitride. At temperatures around minus 65 degrees Celsius, silicon nitride is etched much more significantly than amorphous silicon, allowing the researchers to preserve the silicon substrate.
“We can selectively etch silicon nitride to amorphous silicon just by choosing the right temperature,” said Dussart. “This is something that we don't observe at room temperature or at minus 100 degrees Celsius.”
The authors are planning to expand their study to see if the effect is present when additional materials are incorporated.
“We could potentially obtain some of the same results with other elements,” said Dussart. “We want to expand the research area to other gases and materials.”
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Miniaturized Vacuum System Achieves Crucial Conditions for Quantum Sensing
Authors: Leonard Frank Diekmann, Alexander Kassner, Folke Dencker, and Marc Christopher Wurz
Publication: "Nonevaporable getter-MEMS for generating UHV conditions in small volumina", JVST B, Vol. 40, No. 5, Sep/Oct 2022
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Nonevaporable getter pump and micro-heater maintain high vacuum level in a small volume system.
Quantum sensors use microscopic properties, such as quantum interference and entanglement, to improve upon classical sensor technology. Because they are unhindered by the Heisenberg uncertainty principle, they could lead to increased precision in microscopy, positioning systems, electric or magnetic field measurements, and other applications.
Creating such sensors requires vacuum technology — as well as optics, lasers, and electronics — on a very small scale. In the Journal of Vacuum Science & Technology B, researchers from the Institute of Micro Production Technology at Leibniz University of Hannover constructed a prototype of a miniaturized high vacuum pump and heating plate that effectively maintains vacuum conditions in a small volume. The overall structure is approximately 90 cm high with a 10 cm diameter.
The team aims to develop, build, and put into operation a miniaturized magneto-optical trap. By encapsulating an atom chip with a functionalized glass cover, the design would incorporate all the relevant components to enable and maintain operation in a very small space.
“Development in this area is progressing steadily, so that in recent years highly integrated atom chips have been developed,” said author Leonard Frank Diekmann. “However, these are still used in large structures in the laboratory. For industrial use, the overall system must be made more compact.”
To remove particles from the system and achieve vacuum conditions, the authors used a nonevaporable getter (NEG) pump at the wafer level. The technology is a type of gas-binding adsorption pump and involves a two-step process. In the first stage, molecules physically or chemically bind to the pump surface. During the second stage, the system is heated, and the particles diffuse into the bulk layer, leaving the surface clean. This all occurs on a wafer that is 500 µm thick and has a diameter of 100 mm.
For the heating stage to function, the system requires a miniaturized heating structure. This microheater combines with the NEG thin film coating to allow homogenous heating and adsorption.
“Thanks to integrated, miniaturized temperature sensors, we can monitor the temperature distribution in situ and have a well-rounded overall system with a lot of development potential,” said Diekmann.
The researchers qualitatively tested the prototype by mounting it in a vacuum stand and examining the change in the total and partial pressures after regeneration — with and without the support of additional pump technology.
“The prototype serves as a first milestone in the direction of maintaining a high vacuum level in a small-volume system,” said Diekmann. “The combination of these elements, i.e. the correlation between the exact temperature input and pump performance, forms the basis of this innovation.”
The authors aim to quantitatively determine the operating parameters of the pump, integrate catalytically active layers, and expand the systems to deal with hydrogen and noble gases. They are open for cooperation to use this pump in other miniature vacuum systems.
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Surface Science Spectra Currently Soliciting Data for two NEW Special Topic Collections |
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Materials for Energy and the Environment
To combat the devastating effects of climate change, the world must reduce its reliance on fossil-based fuels, with the goal of achieving a carbon-neutral future. To accomplish this, an increased effort in materials research is being made to increase the availability and efficiency of sources of sustainable energy.
Working towards those ends, SSS welcomes the submission of datasets from materials relating to energy and the environment. Appropriate materials for this special topic collection include not only those being studied for energy conversion and storage, but also those which are used to aid in energy saving and the overall reduction of carbon emissions. This collection is open to all techniques published in SSS which currently includes XPS/AES, ToF-SIMS, SE, UV-vis, and LEIS. More Information
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Higher Energy X-ray Photoelectron Spectroscopy
SSS welcomes the submission of XPS data for elements and simple compounds of known stoichiometry using higher-energy XPS instruments or synchrotron HAXPES facilities for a topical collection which will join two previous collections, one from 2022 and another from 2021 as a reference database to the growing community of higher-energy XPS users. More Information
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Vibrational Sum Frequency Spectroscopy of Thin Film Interfaces
Authors: Erin G. Moloney, Md. S. Azam, Canyu Cai, and Dennis K. Hore
Publication: Biointerphases 17, 051202 (2022)
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We describe a basic theoretical treatment of how film–substrate and substrate–environment (air, water, and solution) interfaces can be selectively probed by controlling the film thickness and beam angles in a visible-infrared sum frequency generation experiment. In this model, we also account for the unique interfacial environment that may have optical properties that differ from the adjacent bulk phases. We see that this affects components of the electric field that are perpendicular to the surface such as when p-polarized light is used. We then provide an example using the glass–polydimethylsiloxane–air system and model the fields at both surfaces of the polymer. This is followed by some practical considerations for setting up such experiments and some typical experimental results. |
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Manipulation of Flying and Single Excitons by GHz Surface Acoustic Waves
Authors: Mingyun Yuan, Klaus Biermann, and Paulo V. Santos
Publication: AVS Quantum Sci. 4, 035901 (2022)
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AVS Journals | Announcements | Open Topics - Calls for Papers
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Surface Analysis 2022: A Success |
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The 41st annual symposium on Applied Surface Analysis (Surface Analysis ‘22) was held in conjunction with the 33rd Annual Symposium of the Pacific Northwest Chapter of AVS (PNWAVS) in the new Energy Sciences Center (ESC) at Pacific Northwest National Laboratory (PNNL) in Richland, Washington on September 14-16, 2022. Surface Analysis ‘22 was the first meeting held in the beautiful new ESC.
Celebrating the 60th anniversary of the PNWAVS, the hybrid meeting included in-person and remote participants from 10 institutions, including virtual speakers and student poster presenters. The symposium featured 10 invited presentations, 6 tutorials on characterization techniques, and 11 vendor exhibitors. Continuing its strong tradition of supporting students, the symposium included 28 graduate and 7 undergraduate student participants with a total of 14 students receiving awards totaling $3,350.
The 34th annual PNWAVS Symposium will be September 14-15, 2023, in Boise, Idaho. We encourage AVS members who live/work in Oregon, Washington, Idaho, Alaska, or British Columbia to please select the PNWAV as your chapter in your MyAVS profile. |
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SIMS 23: Together Again ... Finally |
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by Anna Belu, Scott Bryan and Jerry Hunter, Conference Co-Chairs
The 23rd International Conference on Secondary Ion Mass Spectrometry took place in Minneapolis on September 18-23, 2022. Approximately 200 people attended from 21 different countries, with more than half of the attendees coming from outside the U.S.
The organizers and the participants were glad to finally meet in person since the conference had been postponed a year and it had been three years since SIMS 22 in Kyoto, Japan.
The highlights of the week involved delving into everything related to SIMS! The oral and poster presentations covered a range of topics from the fundamentals of secondary ion formation to high resolution and MS/MS methods. Some of the hot areas for current SIMS applications included energy storage, microelectronics, and evaluating biological cells and tissue.
Beyond that, the two plenary presenters were outstanding in showcasing the importance of mass spectrometry for advancing understanding of natural materials. Emeritus Professor John Valley at the University of Wisconsin-Madison presented on “Oxygen Isotope Analysis in Carbonates” where SIMS gives insights into the diffusion/kinetics of mineral reactions which is impactful for reservoir studies of sedimentary basins and paleoclimatology. Vicki Wysocki, Ohio Eminent Scholar at The Ohio State University, discussed “The Role of Surface Collisions in Native Mass Spectrometry and Structural Biology” where her long-standing work on surface-induced dissociation reveals the structural properties of protein and nucleoprotein complexes.
In addition, the SIMS School, a short course sponsored by IUVSTA covered many pertinent topics from Fundamentals of SIMS to Industrial Applications. It was a popular option on a Sunday afternoon, with approximately 60 people attending.
For students attending the conference, there was an opportunity to participate in the Student Presentation Competition. The top six presenters with SIMS related research were honored with awards. We are grateful for support from the journal Biointerphases for the biointerface awards as well as Ionoptika for the Rowland Hill Awards.
Overall, the sponsors and exhibitors were a great support in making the conference possible. The exhibit booths were located just outside the meeting rooms allowing for easy interaction and discussions between participants and exhibitors throughout the week.
Participants enjoyed social and networking opportunities including the lively Welcome Reception, during the poster session, at the conference banquet on Wednesday evening, and over lunch each day. There was also time to explore the local culture of Minneapolis one afternoon including the historic Mississippi Riverfront area, the Minnesota Twins baseball stadium, the Walker museum of modern art, and the Mall of America.
It was a relief that the SIMS 23 conference was administered by AVS staff. Their expertise in conference management was heavily relied upon while navigating the challenges resulting from the pandemic.
Now the SIMS community is already looking forward to SIMS 24 which will take place in La Rochelle, France September 8-13, 2024 ( www.sims-24.com).
Submit your SIMS research to the Special Topic Collections in JVST B or Biointerphases! Manuscripts are due February 10, 2023.
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Who can spot the symbolism in the photo above taken on the SIMS 23 Riverfront Excursion by Nathan Havercroft, IONTOF USA. Other Images Courtesy of Heather Korff, AVS. |
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AVS 68th International Symposium and Exhibition |
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Dates: November 6-11, 2022
Location: David L. Lawrence Convention Cntr., Pittsburgh, Pennsylvania, USA (IN-PERSON)
The AVS International Symposium and Exhibition has been developed to address cutting-edge issues associated with vacuum science and technology in both the research and manufacturing communities.
The Symposium is a week-long forum for science and technology exchange featuring papers from technical divisions and technology groups, and topical conferences on emerging technologies.
The equipment exhibition is one of the largest in the world and provides an excellent opportunity to view the latest products and services offered by over 150 participating companies. More than 2,000 scientists and engineers gather from around the world to attend.
The AVS Member Center will focus on career-related professional development sessions and provide networking opportunities to all attendees throughout the week. In addition, there will be a Job Center offered to all attendees and it will provide the opportunity for job seekers to submit their résumés and meet with potential employers. |
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AVS e-Talk: Design, Realization, Applications of Gas and Ion Separations Materials |
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Date: November 16, 2022
Location: Virtual
Presenter: Tina Nenoff, Senior Scientist, Sandia National Laboratories
The ability to design, tune and successfully test nanoporous crystalline materials allows for the development and commercialization of materials for many different environmental and energy applications. Metal-organic frameworks (MOFs) have shown great potential in challenging separations of molecules with very similar kinetic diameters. One area of strong focus in our lab is toward a fundamental understanding of the structure-property relationship of selective adsorption in MOFs. Here our team has implemented a synergistic approach involving predictive molecular modeling, experimental synthesis, and advanced testing to enable rapid discovery of new materials. Density functional theory (DFT) calculations were used to measure the binding energy for various gases on coordinatively unsaturated metal sites in MOFs. The modeling guides the materials synthesis, which in turn is supported by laboratory testing. Results then are used to validate and optimize the models for continuous advancements. Applications as adsorbents and direct electrical readout sensors will be presented.
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Additional Upcoming AVS Sponsored Events |
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December 11-15, 2022
Waikoloa, Hawaii
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January 15-19, 2023
Redondo Beach, California
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May 21-26, 2023
San Diego, California
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