OnDemand Webinar Series


Presentations: 3

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Sessions Included:

Piezotronics and Piezophototronics (Dec 12, 2018 12:00 PM)

Standard: Free

Sessions

Piezotronics and Piezophototronics


Piezotronics and piezophototronics are two newly coined fields for third-generation semiconductors that actively couple the strain-induced polarization potential with the mobile charge carrier transport behavior. The fundamental effects are likely to impact the design and fabrication of electronic and photonic devices for mechanosensation, human-machine interfacing, robotics, artificial intelligence, sensors, LEDs, solar cells, and catalysis. The December, 2018 issue of MRS Bulletin highlights the progress made in these two fields.

This webinar will expand on the Bulletin issue, and an interactive Q&A will be held with each of the speakers following their talks.

Host(s):

3D Printing of Biomaterials3D Printing of Biomaterials

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3D Printing of Biomaterials



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Fundamental Understanding and Applications of High-Entropy Alloys


High entropy alloys (HEAs) and the more broadly defined multi-principal-elements alloys (MPEAs) represent a major paradigm shift in alloy design. HEAs focus on the compositions near the center of a multicomponent phase diagram. By contrast, traditional alloys focus compositions on the boundaries (vertices, edges, or faces) of a phase diagram and typically consist of one principal element. Therefore, HEAs represent a tremendously vast compositional space that is largely unexplored by science. As an emerging field, research on HEAs has attracted rising worldwide attention and interest from both academia and industry since 2004. The number of published papers has increased rapidly each year, and there have been many dedicated conferences, symposia and workshops on HEAs. Traditional physical metallurgy principles as well as novel processing methods have all been applied to HEAs, and new materials with extraordinary properties have been reported. New results also show that traditional materials science concepts are inadequate to explain some of the newly observed behaviors, fueling intense development of new models for complex, concentrated alloys. The high-entropy concept has now been extended to ceramics, semiconductors, polymers, and a broad range of functional materials. As a result, the whole field has advanced dynamically and rapidly in almost every aspect of materials science and engineering.

The objective of the October 2018 Journal of Materials Research (JMR) Focus Issue on High-Entropy Alloys was to give a timely review of the present fundamental understanding of HEAs and their potential applications. This webinar expanded on the Focus Issue with talks and live Q&A with issue authors.



AFM Characterization of Emerging Photovoltaics


Presented by Oxford Instruments Asylum Research


The atomic force microscope (AFM) provides unique capabilities for nanoscale characterization of photovoltaic materials and devices. It can probe local electrical and functional response in light or dark conditions with environmental control, and map surface structure with unprecedented resolution. In this webinar, we provide an overview of AFM applications for emerging photovoltaics including hybrid organic-inorganic perovskites and organic semiconductors. Our guest speaker, Dr. Rajiv Giridharagopal, discusses results using standard and advanced modes such as photoconductive AFM, piezoresponse force microscopy (PFM), and time-resolved electrostatic force microscopy. Additional results are presented to further illustrate the power and versatility of AFMs for photovoltaic R&D.

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Machine Learning, AI, and Data-Driven Materials Development and Design


Materials are an important contributor to technological progress, and yet the process of materials discovery and development has historically been inefficient. In general, the current innovation workflow is human-centered, where researchers design, conduct, analyze and interpret results obtained through experiments, simulations or literature review. Such results are often high-dimensional, large in number and heterogeneous in nature, which hinders a researcher’s ability to draw insight from this data manually. 

This webinar explores the synthesis of machine learning with materials research, highlighting a broad spectrum of topics in which machine learning, artificial intelligence, or statistics play a significant role in addressing problems in experimental and theoretical materials science. It also generated discussion on the fundamental connection between machine learning and material science, and its future application and impact.

This webinar was held in conjunction with the 2018 MRS Fall Meeting symposium of the same name.  

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​Lead-free Piezoceramics​Lead-free Piezoceramics

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​Lead-free Piezoceramics


With restrictions on hazardous substance usage in various applications comes lead-free compositions in certain piezoceramic applications. The current knowledge of primary piezoelectric properties has reached a sufficient level for use in applications, but research efforts continue toward a better understanding of secondary properties. Efforts to reduce the production and waste disposal of toxic lead has resulted in open avenues for new materials with properties better than lead zirconate titanate.

The August, 2018 issue of MRS Bulletin focused on ​Lead-free Piezoceramics, and this webinar builds on the information presented in the issue.  Attendees were able to participate in a live Q&A session with the speakers at the conclusion of each talk.


Talks:

  • Lead-free Piezoelectrics - The Environmental and Regulatory Issues 
    Andrew Bell, University of Leeds
  • Challenges in processing of potassium sodium niobate piezoelectric ceramics
    Barbara Malic, Jožef Stefan Institute
  • Relaxor-ferroelectric Transitions: Sodium Bismuth Titanate Derivatives
    Jacob Jones, North Carolina State University

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​Ultrafast Imaging of Materials Dynamics


The advent of short-pulse electron and x-ray sources has enabled pump-probe approaches for elucidating ultrafast materials dynamics. The July, 2018 issue of MRS Bulletin provides a cross section of the vigorous activity occurring in the study of light-induced ultrafast materials dynamics as it relates to various approaches. 

The approaches highlighted are leading to new physical insights, possibilities for engineering the properties of matter, and a new understanding of materials functionality of ultrasmall and ultrashort spatiotemporal scales.

The talks in this webinar will build upon the information presented in the MRS Bulletin issue, and a live question-and-answer session with the speakers will follow each talk.

Talk Presentations:

  • meV Energy Resolution in Energy Filtered Electron Microscopy
    Fabrizio Carbone, École Polytechnique Fédérale de Lausanne
  • Scanning ultrafast electron microscopy: Four-dimensional imaging of materials dynamics in space and time
    Presentation by Bolin Liao, University of California, Santa Barbara
    Q&A with Ding-Shyue (Jerry) Yang, University of Houston

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​Materials for Nonreciprocal Photonics


For photonic systems, breaking reciprocity using nonreciprocal materials is a fundamental challenge and opportunity, which is both of scientific interest and of technical importance. It allows for the development of key photonic components, such as optical isolators and circulators-on-a-chip and also provides revolutionary ways to transport and process data in photonic systems. In the June, 2018 issue of MRS Bulletin, several representative research directions toward realizing integrated nonreciprocal photonic materials and devices are summarized.

The talks in this webinar expanded upon the MRS Bulletin issue, and attendees were able to interact—in real time—with the webinar presenters.

Talks:

  • Monolithic Magneto-optical oxide thin films for on-chip optical isolation
    Juejun Hu, Massachusetts Institute of Technology
  • Optical nonreciprocal devices for silicon photonics using wafer-bonded magneto-optical garnet materials
    Tetsuya Mizumoto, Tokyo Institute of Technology
  • Integrated all-mode Faraday rotators using sputter deposited MO thin films
    David Hutchings, University of Glasgow

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