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Singh Center for Nanotechnology 2021 Annual User Meeting

MEAM Seminar: “Computational Mechanics for Landing on Mars”

Current technology for decelerating a spacecraft from the high speed of atmospheric entry to the final stages of landing on Mars is based on low-density supersonic decelerators such as low mass and high packaging efficiency parachute systems. To enable future exploration missions featuring sophisticated robots and safely land heavier spacecraft on Mars, larger than before […]

Tedori-Callinan Lecture: “Resist Fatigue by De-concentrating Stress”

Most materials suffer from a disease: fatigue. Symptoms include degradation of properties and growth of cracks under cyclic stretch. These materials are unfit for applications involving prolonged and cyclic loads. A crack grows in a material because the crack tip concentrates stress. Recently, we have been developing fatigue-resistant materials by de-concentrating stress, through mechanisms at […]

MEAM PhD Thesis Defense: “Analytical Homogenization Estimates for the Effective Properties and Field Statistics of Viscoplastic Composites and Particle Suspensions”

Heterogeneous materials are commonly found in nature (e.g. soil, rock, blood) and engineering applications (e.g. paints, lubricants, sintered materials). Understanding the microstructure-properties relations is crucial to predicting how these materials fail and behave during processing. In this thesis, we develop semi-analytical homogenization estimates for the macroscopic properties and field statistics of viscoplastic composites. A generalization […]

MEAM Seminar: “Electrets, Magnetics and Deformation in Soft Materials”

Soft robotics, energy harvesting, large-deformation sensing and actuation, are just some of the applications that can be enabled by soft dielectrics that demonstrate substantive electromechanical coupling. Imagine now also a material that will produce electricity and deform substantively via a contactless, wireless magnetic signal. Unfortunately, truly soft, naturally occurring piezoelectric or magnetoelectric materials essentially do […]

MEAM PhD Thesis Defense: “Dynamic Behavior of Periodic Media and Elastic Metamaterials”

Periodic media and resonant, acoustic/elastic metamaterials possess extraordinary frequency band gaps where no waves may propagate. In this dissertation, we leverage numerical simulations to gain insight into practical ways to effectively measure and characterize the behavior of these materials from experimental observables and also explore physical mechanisms to optimize their performance, particularly in the context […]

MEAM PhD Thesis Defense: “A Differential Homogenization Framework for Precipitation-Strengthened Metals”

Composite materials, such as metal- and polymer-matrix composites, exhibit both elastic and dissipative effects when subjected to macroscopic loadings. Even when the phases of the composite are characterized by a simple Maxwell rheology, the complex viscoelastic interactions between the phases give rise to emergent behavior at the macroscopic scale. Incorporating these “long-memory” effects in the […]

MEAM Seminar: “Kirigami: Programming Cutting and Folding from Microscale to Meter Scale”

Programmable shape-shifting materials can take different physical forms to achieve multifunctionality in a dynamic and controllable manner. By introducing holes and cuts in 2D sheets, we demonstrate dramatic color and shape change and super-conformability via collapsing or expanding of the hole arrays in the micro- and macroscales. When choosing the cuts and geometry correctly, we […]

BE Seminar: “Material Design for Lymph Node Drug Delivery and Immunomodulation” (Susan Thomas)

This event will be held live and broadcast on zoom – link coming soon. Lymph nodes mediate the co-mingling of cells of the adaptive system to coordinate adaptive immune response. Drug delivery principles and technologies our group has developed to leverage the potential of lymph nodes as immunotherapeutic drug targets to augment anti-cancer therapeutic effects […]

MEAM Seminar: “Active Colloids in Nematics for Micro-robotics and Reconfigurable Systems”

Active colloids in nematic liquid crystals are exciting vehicles for materials manipulation. Colloid shape, surface chemistry and dynamic displacement can be designed to introduce defects whose non-linear dynamics generate new modalities of motion and interaction. These effects rely on energy conversion mechanisms, in which active colloids with tailored surface functionalization and shape seed defects and […]

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