Soft modes in glasses: chemical control of relaxation and mechanical response. The unusual dynamical and mechanical properties of viscous liquids and glasses underpins many existing and emerging technologies, from lubrication to the strength and fragility of bulk metallic glasses. An improved understanding of how macroscopic properties such as viscous flow, ductility and fracture emerge from the microscopic interactions between atoms and molecules will provide the enabling scientific knowledge f ....Soft modes in glasses: chemical control of relaxation and mechanical response. The unusual dynamical and mechanical properties of viscous liquids and glasses underpins many existing and emerging technologies, from lubrication to the strength and fragility of bulk metallic glasses. An improved understanding of how macroscopic properties such as viscous flow, ductility and fracture emerge from the microscopic interactions between atoms and molecules will provide the enabling scientific knowledge for exploiting the properties of such materials on the nanoscale. National expertise in this area will help establish and strengthen international collaboration with leading research institutes in the field.Read moreRead less
Nanotribology and Nanorheometry: A Fundamental Study of the Dynamic Interactions of Particles and Surfaces at the Molecular Level. Friction and deformation occur from the mutual motion and interaction of microscopic particles and surfaces. This research aims to develop new theories and measurement techniques for these non-equilibrium phenomena by combining mathematical analysis and numerical computations with dynamic force measurement, surface modification, and surface characterisation on nanom ....Nanotribology and Nanorheometry: A Fundamental Study of the Dynamic Interactions of Particles and Surfaces at the Molecular Level. Friction and deformation occur from the mutual motion and interaction of microscopic particles and surfaces. This research aims to develop new theories and measurement techniques for these non-equilibrium phenomena by combining mathematical analysis and numerical computations with dynamic force measurement, surface modification, and surface characterisation on nanometre and molecular length scales. These insights and data will be critically important in designing low-friction surfaces that save energy and wear, in developing nanoscopic probes for the mechanical and structural properties of soft polymeric and bio-materials, and in making high performance coatings that control adhesion and particle aggregation in technologically advanced applications.Read moreRead less
Atomistic Mechanisms of Stress Relaxation in Amorphous Materials. Amorphous materials represent a major thrust in the search for new materials. Metallic glasses have very high strength and can be cast to much finer tolerances than regular (polycrystalline) metals. Ceramic glasses are finding increasing applications in data storage, photoelectronics and fibre optics. The greatest obstacle to the application of amorphous solids is their brittleness. The goal of this project is to use accurate comp ....Atomistic Mechanisms of Stress Relaxation in Amorphous Materials. Amorphous materials represent a major thrust in the search for new materials. Metallic glasses have very high strength and can be cast to much finer tolerances than regular (polycrystalline) metals. Ceramic glasses are finding increasing applications in data storage, photoelectronics and fibre optics. The greatest obstacle to the application of amorphous solids is their brittleness. The goal of this project is to use accurate computer simulations to provide detailed pictures of how atomic motions relax stress in very different types of glasses and, through this insight, explore ways of modifying the mechanical properties of these materials.Read moreRead less
Fluctuation Effects in Non-Crystallising Liquids. Understanding the behaviour of liquids colder than their freezing temperature is important in areas as diverse as metal alloy preparation, prevention of cell damage in plants and animals at low temperatures, extending the working temperature range of new high voltage automotive batteries and controlling drug delivery in pharmaceuticals. Advances in these areas would represent important new manufacturing opportunities in industries already establi ....Fluctuation Effects in Non-Crystallising Liquids. Understanding the behaviour of liquids colder than their freezing temperature is important in areas as diverse as metal alloy preparation, prevention of cell damage in plants and animals at low temperatures, extending the working temperature range of new high voltage automotive batteries and controlling drug delivery in pharmaceuticals. Advances in these areas would represent important new manufacturing opportunities in industries already established in Australia. In this project the fundamental physical chemistry of supercooled liquids is developed and applied to a number of these technological challenges.Read moreRead less
Disorder and Dynamics in Superionic Conductors. This project will pursue a powerful new approach to superionic conductors, an important class of advanced materials that are critical to the development of clean-energy technologies, such as solid-oxide fuel cells. This will be a new direction for Australian science in the theoretical treatment of material properties. The project will also make significant progress in the computer-aided design of advanced materials, and in the simulation methods th ....Disorder and Dynamics in Superionic Conductors. This project will pursue a powerful new approach to superionic conductors, an important class of advanced materials that are critical to the development of clean-energy technologies, such as solid-oxide fuel cells. This will be a new direction for Australian science in the theoretical treatment of material properties. The project will also make significant progress in the computer-aided design of advanced materials, and in the simulation methods themselves, contributing to pure science in the form of our understanding of the physics and chemistry of materials at the most fundamental level. Read moreRead less
THE STABILITY OF GLASS-FORMING ALLOYS: SIMULATION STUDIES. Many of the properties that make common glass so valuable as a material can also be achieved in amorphous metals. The 'trick' is to avoid crystallization as the molten state is cooled. Recently, novel combinations of metals have been found to slow down crystallization enough to produce stable amorphous alloys. Developing these new materials depends on an accurate atomic level understanding of how crystallization is frustrated in glass-fo ....THE STABILITY OF GLASS-FORMING ALLOYS: SIMULATION STUDIES. Many of the properties that make common glass so valuable as a material can also be achieved in amorphous metals. The 'trick' is to avoid crystallization as the molten state is cooled. Recently, novel combinations of metals have been found to slow down crystallization enough to produce stable amorphous alloys. Developing these new materials depends on an accurate atomic level understanding of how crystallization is frustrated in glass-forming alloys. This project's aim is to use computer simulations to provide the first microscopic picture of the atomic order that stabilzes the amorphous alloys with regards to both crystallization and mechanical stress.Read moreRead less
Stability of nanoscale structures at the surface of metallic glasses. This project aims to develop advanced electrodes and catalysts for batteries and hydrogen generation. These technologies are crucial components in the efficient use of alternative energy supplies. The outcome of this project will be an accurate computer modelling tool for predicting nanoporous structures of metallic glass generated by de-alloying, and for establishing the role of various factors in determining the stability of ....Stability of nanoscale structures at the surface of metallic glasses. This project aims to develop advanced electrodes and catalysts for batteries and hydrogen generation. These technologies are crucial components in the efficient use of alternative energy supplies. The outcome of this project will be an accurate computer modelling tool for predicting nanoporous structures of metallic glass generated by de-alloying, and for establishing the role of various factors in determining the stability of metallic glass nanostructures. This work will include fundamental insights into glass surfaces and dissolution.Read moreRead less
Soft Modes, Amorphous Defects and the Mechanical Properties of Metallic Glasses. Accounting for the material properties of glassy solids in terms of the atomic configurations and processes remains a profound challenge, largely due to the complexity and heterogeneity of amorphous structure. This project uses computer simulations to explore the proposition that localised soft vibrational modes in metallic glasses play a role analogous to that of crystal defects and can provide a valuable microscop ....Soft Modes, Amorphous Defects and the Mechanical Properties of Metallic Glasses. Accounting for the material properties of glassy solids in terms of the atomic configurations and processes remains a profound challenge, largely due to the complexity and heterogeneity of amorphous structure. This project uses computer simulations to explore the proposition that localised soft vibrational modes in metallic glasses play a role analogous to that of crystal defects and can provide a valuable microscopic account of the material properties and their dependence on composition and preparation. This research will lead to a significant improvement in our capacity to tune the properties of amorphous alloys by fabrication methods.Read moreRead less
Kinetics of Fast Crystal Growth in Inorganic Alloys and Molecular Liquids. The aim of this project is to identify the physical origins of fast crystal growth in three important classes of materials: metallic alloys, chalcogenide alloys and organic molecules. Fast crystal growth is crucial to the development of solid state memory based on phase change. In metallic glasses and many pharmaceuticals, fast growth is a problem, destabilising the desired glassy state. The anticipated outcomes of the pr ....Kinetics of Fast Crystal Growth in Inorganic Alloys and Molecular Liquids. The aim of this project is to identify the physical origins of fast crystal growth in three important classes of materials: metallic alloys, chalcogenide alloys and organic molecules. Fast crystal growth is crucial to the development of solid state memory based on phase change. In metallic glasses and many pharmaceuticals, fast growth is a problem, destabilising the desired glassy state. The anticipated outcomes of the project will include the capability to chemically manipulate the crystal growth rate to design new functional phase changes devices, to identify new types of glass forming materials and to replace the 80-year-old theory of crystal growth with one that accurately reflects the microscopic mechanisms of ordering at the growing interface.Read moreRead less
Discovery Early Career Researcher Award - Grant ID: DE210100256
Funder
Australian Research Council
Funding Amount
$415,283.00
Summary
Extracting the hidden structure of glass from particle vibrations. Predicting the rigid behaviour of glass from its disordered, amorphous atomic structure remains a challenge in materials science. This project aims to define an innovative measure of structure based on how constrained each particle is, which can be quantified by measuring the particles’ vibrations. Using this new measure of structure, this project expects to link the microscopic structure of glass to its macroscopic properties v ....Extracting the hidden structure of glass from particle vibrations. Predicting the rigid behaviour of glass from its disordered, amorphous atomic structure remains a challenge in materials science. This project aims to define an innovative measure of structure based on how constrained each particle is, which can be quantified by measuring the particles’ vibrations. Using this new measure of structure, this project expects to link the microscopic structure of glass to its macroscopic properties via computer simulations. Expected outcomes of this project include a new methodology for characterising amorphous materials and an improved understanding of the nature of glass. This should provide significant benefits, such as an increased ability to rationally design amorphous materials with desired properties.Read moreRead less