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Nano-Architected Materials Offer New Frontier in Technology

07-27-22

For the past two decades, Julia R. Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering; Fletcher Jones Foundation Director of the Kavli Nanoscience Institute, has been at the forefront of creating new materials whose structures are designed and controlled at the smallest level, giving them unusual and useful properties. [Caltech story]

Tags: APhMS MedE MCE Julia Greer alumni Carlos M. Portela

A Science Journey with Fernando Villafuerte

04-26-22

As part of the Science Journeys lecture series—designed to inspire scientific curiosity, especially among students in eighth grade and higher—graduate student Fernando Villafuerte discussed his path to Caltech and his research on batteries, including their role in sustainability solutions. Villafuerte works in the lab of Julia R. Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering; and Fletcher Jones Foundation Director of the Kavli Nanoscience Institute. His research focuses on a novel material known as a solid polymer electrolyte, which could potentially be used to create batteries that can store more energy than currently possible. [Caltech story]

Tags: APhMS research highlights MedE MCE Julia Greer Fernando Villafuerte

Nano-architected Material Refracts Light Backward—An Important Step Toward One Day Creating Photonic Circuits

02-01-22

A newly created nano-architected material exhibits a property that previously was just theoretically possible: it can refract light backward, regardless of the angle at which the light strikes the material. "Negative refraction is crucial to the future of nanophotonics, which seeks to understand and manipulate the behavior of light when it interacts with materials or solid structures at the smallest possible scales," says Julia R. Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering; Fletcher Jones Foundation Director of the Kavli Nanoscience Institute. [Caltech story]

Tags: APhMS research highlights MedE MCE Harry Atwater Julia Greer Victoria Chernow Siying Peng Ryan Ng

Nano-Architected Material Resists Impact Better Than Kevlar

06-25-21

Julia R. Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering; Fletcher Jones Foundation Director of the Kavli Nanoscience Institute, has developed a nano-architected material made from tiny carbon struts that is, pound for pound, more effective at stopping a projectile than Kevlar, a material commonly used in personal protective gear. "The knowledge from this work could provide design principles for ultra-lightweight impact resistant materials for use in efficient armor materials, protective coatings, and blast-resistant shields desirable in defense and space applications," says Greer. [Caltech story]

Tags: APhMS research highlights MedE MCE Julia Greer KNI

Tiny Shape-Shifting Polymers Developed for Potential Medical Applications

01-04-21

Julia Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering; Fletcher Jones Foundation Director of the Kavli Nanoscience Institute, has developed a process for generating three-dimensional architected polymers with heat-dependent "shape memory" properties: that is, when heated, the material folds and unfolds itself into a new preordained shape. These shape memory polymers could one day be used to perform complex tasks inside the human body, such as unclogging a blocked artery or pulling out a blood clot. [Caltech story]

Tags: APhMS research highlights MedE Julia Greer KNI Luizetta Elliott

Microstructures Self-Assemble into New Materials

03-03-20

A new process developed at Caltech makes it possible for the first time to manufacture large quantities of materials whose structure is designed at a nanometer scale—the size of DNA's double helix. Pioneered by Julia R. Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering; Fletcher Jones Foundation Director of the Kavli Nanoscience Institute, "nanoarchitected materials" exhibit unusual, often surprising properties—for example, exceptionally lightweight ceramics that spring back to their original shape, like a sponge, after being compressed. Now, a team of engineers at Caltech and ETH Zurich have developed a material that is designed at the nanoscale but assembles itself—with no need for the precision laser assembly. "We couldn't 3-D print this much nanoarchitected material even in a month; instead we're able to grow it in a matter of hours," says Carlos M. Portela, Postdoctoral Scholar. "It is exciting to see our computationally designed optimal nanoscale architectures being realized experimentally in the lab," says Dennis M. Kochmann, Visiting Associate. [Caltech story]

Tags: APhMS research highlights GALCIT MedE MCE Julia Greer KNI Dennis Kochmann postdocs Carlos Portela

Professor Julia R. Greer Named Director of the Kavli Nanoscience Institute

10-03-19

Julia R. Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering, has been named the Fletcher Jones Foundation Director of the Kavli Nanoscience Institute (KNI). Greer replaces professors Oskar Painter and Nai-Chang Yeh, who served together as co-directors. "I am delighted to begin spearheading the wonderful enterprise of the KNI, humbly following the footsteps of my predecessors, professors Painter and Yeh. I have been a KNI member and on the board of directors since shortly after I arrived at Caltech," Greer says. [Caltech story]

Tags: APhMS honors MedE MCE Julia Greer

New Metamaterial Changes Shape in a Tunable Fashion

09-12-19

Julia R. Greer, Ruben F. and Donna Mettler Professor of Materials Science, Mechanics and Medical Engineering, has developed a new type of architected metamaterial that has the ability to change shape in a tunable fashion. The material has potential applications in next-generation energy storage and bio-implantable micro-devices. [Caltech story]

Tags: APhMS research highlights MedE Julia Greer

Professor Greer Receives the AAAFM Heeger Award

06-24-19

Julia R. Greer, Professor of Materials Science, Mechanics and Medical Engineering, has received the American Association for Advances in Functional Materials (AAAFM) Heeger Award for her pioneering research in creating and applying multi-scale 3D architected materials in chemical and biological devices, ultra-light weight energy storage systems, damage-tolerant fabrics, and additive manufacturing. [Award announcement]

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New Process Allows 3-D Printing of Nanoscale Metal Structures

02-09-18

Professor Julia Greer and graduate student Andrey Vyatskikh have created complex nanoscale metal structures using 3-D printing. The process, once scaled up, could be used in a wide variety of applications and opens the door to the creation of a new class of materials with unusual properties that are based on their internal structure. [Caltech story]

Tags: research highlights MedE MCE Julia Greer MatSci Andrey Vyatskikh