Register for Session One (June 8, 9:00 am – 12:00 pm)
Register for Session Two (June 10, 9:00 am – 12:00 pm)
Tuesday, June 8, 2021 – 9:00 am to 12:00 noon
- Bryan Huey, Department Head, Materials Science and Engineering Department: MSE Update
- Rainer Hebert, Associate Director, Institute of Materials Science: Microsegregation and solidification cracking during additive manufacturing
Abstract: Solidification cracking has pestered metallurgists for a long time. Whether welding, casting, cladding, or now also additive manufacturing, cracks forming during the transformation from the liquid to solid have caused rework and cost beyond anyone’s guess. Physical models describing the mechanisms of solidification cracking have not appeared until the 1990s. Some models approach the problem from a thermodynamic and solidification angle while others focus on the crack propagation once a void or a crack initiated. The thermodynamic and solidification models revolve around the concept of microsegregation, but also consider kinetic and rheological aspects. Highly specialized equipment helps measuring input parameters for the solidification cracking models: Calorimetry reveals the temperature dependence of the solid fraction during solidification and new, chip-based calorimeters are now available that can detect reactions at heating or cooling rates of up to 40,000 K/s. When liquid alloy flows into interdendritic regions, its viscosity largely controls the flow behavior. High-temperature rheology reveals the viscosity of many alloys and when operated in oscillatory mode, can differentiate between viscous and elastic contributions within the solid-liquid two phase region. During melting samples lose their mechanical strength and also their ductility while during solidification the mechanical strength increases with the fraction solid. A Gleeble thermomechanical simulator has been used to determine the transitions in mechanical strength during melting and solidification. Comparisons with calorimetry measurements reveal important details of the solidification cracking behavior. These advanced experimental methods, supplemented by electron microscopy studies, improve the understanding of solidification cracking and support the existing models with previously unavailable input data.
- Seok-Woo Lee, Pratt & Whitney Professor of Materials Science and Engineering: Mechanical Characterization of Materials at Small Length Scales
Abstract: Mechanical characterization has played a central role not only in the understanding of the mechanical properties of materials but also in the development of a mechanically reliable product. Most traditional mechanical testing methods have been able to measure the macroscopic mechanical properties of bulk materials. However, it is often critical to measure the mechanical properties of small materials (nanowire or nanoparticle) or small areas (a single grain or oxide particle in alloys) to gain a fundamental understanding of the mechanical properties of materials. This presentation will introduce unique small-scale mechanical testing capabilities, which Dr. Lee’s research group has developed for the past seven years at UConn. The use of small-scale mechanical testing for the study on aluminum alloys, superelastic intermetallic compounds, and polymer nanocomposites will be described. The important role of small-scale mechanical testing on data science will also be discussed.
Session 1 Laboratory Tours
- Spectroscopy and Chromatography Laboratories – Dr. Capri Price
- Thermal Analysis, Polymer processing, and Rheology Laboratories – Dr. Dennis Ndaya
- Nuclear Magnetic Resonance and Mechanical Characterization Laboratories – Dr. Nicholas Eddy
- X-ray Diffraction, Scattering, and Fluorescence Laboratories – Dr. Daniela Morales
- Atomic Force Microscopy Laboratory – Dr. Bryan Huey, and Dr. Will Linthicum
Student Poster Session
Thursday, June 10, 2021 – 9:00 am to 12:00 noon
Special Guest Presentations
- Steven L. Suib, Director, Institute of Materials Science
- Carl Lejuez, Provost, University of Connecticut
- Luyi Sun, Director, IMS Polymer Program: IMS Polymer Program Update
- Leslie Shor, Associate Professor of Chemical and Biomolecular Engineering: Microbial Assay Systems for Medical and Biotech Applications
The function of any biological system depends on local environmental conditions. For bacterial systems, micro-scale structures including the chemical properties and physical topography of surfaces, micro-scale chemical gradients, and patterns of biological distribution impact diversity, abundance, and activity of microbial communities. However, conventional bacterial culturing methods do not faithfully emulate key micro-scale features of real microbial habitats; as a result, most microbial assay systems do not accurately capture the realistic range of microbial function of the real system being studied. The Shor lab designs, builds, and operates custom microbial assay systems to emulate key microbial habitat features reproducibly and often with high throughput in order to better emulate realistic microbial functionality in product development and testing. Recent applications include biofilm assays that measure biofilm attachment, growth, or respiration as a function of material or operating conditions and soil-emulating micromodels to accelerate the development of agriculture biotechnology for more sustainable food production.
- J. Nathan Hohman, Assistant Professor of Chemistry: Nanotechnology for a Macroscale world
Abstract: When reduced in size to the nanoscale, materials express compelling new phenomena. From single sheets of carbon for transparent electrodes to clusters of gold for biosensing, scaling materials to the very small has led to new discoveries impacting photovoltaics, batteries, catalysts, and more. However, working with nanomaterials is challenging, requiring extra effort to deal with small particles. New classes of hybrid semiconductors are emerging that combine the worlds of organic and inorganic chemistry to yield new opportunities in nanomaterial design. Here, we describe the synthesis and design of metal-organic chalcogenolates (MOCha), low-dimensional nanostructures can be prepared that are part of a crystalline ensemble, unlocking new portions of the period table to the exploration of low-dimensional phases. Here, we consider the structure and organization of mithrene- silver benzeneselenolate- a self-assembling layered hybrid structure and examine its optoelectronic properties in the context of a 2D-like material. New opportunities for engineered catalysis are described.
Session 2 Laboratory Tours
- UConn Thermo Fisher Scientific Center for Advanced Microscopy and Materials Analysis – Dr. Roger Ristau, Manager
- Reverse Engineering Fabrication Inspection & Non-Destructive Evaluation (REFINE) – Dr. Sina Shahbazmohamadi, Director
- Pratt & Whitney Additive Manufacturing Center (PW AMC) – Dr. Rainer Hebert, Director
- Proof of Concept Center (POCC) – Joseph Luciani, Director