 |
|
A snapshot of the transformation
September 12, 2008LIVERMORE, Calif. - Researchers have achieved a milestone in materials science and electron microscopy by taking a high-resolution snapshot of the transformation of nanoscale structures.
Using the Lab's Dynamic Transmission Electron Microscope (DTEM), Judy Kim and colleagues peered into the microstructure and properties of reactive multilayer foils (also known as nanolaminates) with 15-nanosecond-scale resolution.
"This is the first time that a detailed study of these reactive nanolaminates has exposed what is happening in the self-propagating high-temperature synthesis zone," Kim said.
Time-resolved images of nanolaminates show a brief change in structure with a short cellular phase separation during cooling.
Observing short-lived behavior - how a chemical reaction, structural deformation or phase transformation occurs - is not easy, but is key to understanding many of the basic phenomena at the heart of chemistry, biology and materials science. The ability to directly observe and characterize these complex events leads to a fundamental understanding of properties such as reactivity, stability and strength, and helps in the design of new and improved materials and devices.
Transmission electron microscopy has evolved dramatically in recent years and can spatially resolve microstructural details of phase and structure, but it can't collect at times less than a millisecond.
That's where Livermore's DTEM comes in. It provides scientists with the ability to image transient behavior with an unprecedented combination of spatial and temporal resolution: nanometers and nanoseconds.
"Direct real-space observations of phase transformations on the nanosecond scale have allowed us to relate the formation mechanism in reactive multilayer foils to binary alloy solidification," Kim said. "This conclusion is based upon transient features that could not have been found using any other technique."
Because the team needed access to time and real-space that is impossible to study using traditional methods such as conventional in situ TEM (limited to video rates) or ultrafast diffraction (which presently lacks direct real-space imaging capabilities), the DTEM fit the bill.
"The ability to determine not only crystal structure, but also morphological evolution of dynamic events on the nanoscale has far-reaching implications for the study of materials science, non-equilibrium processes and the behavior of matter on very fine scales of length and time," Kim said.
Multilayer foils are layers of reactant materials that undergo exothermic, self-propagating reactions when layer mixing is caused by an external energy source. The foils show mobile, high-temperature reaction zones where atoms of adjoining layers diffuse across the interfaces. They are used as customized heat sources for rapid fuses, biological neutralization and joining materials via localized heating rather than global device heating.
LIVERMORE, Calif. - Researchers have achieved a milestone in materials science and electron microsco
Time-resolved images of nanolaminates show a brief change in structure with a short cellular phase separation during cooling.
Observing short-lived behavior - how a chemical reaction, structural deformation or phase transformation occurs - is not easy, but is key to understanding many of the basic phenomena at the heart of chemistry, biology and materials science. The ability to directly observe and characterize these complex events leads to a fundamental understanding of properties such as reactivity, stability and strength, and helps in the design of new and improved materials and devices.
Transmission electron microscopy has evolved dramatically in recent years and can spatially resolve microstructural details of phase and structure, but it can't collect at times less than a millisecond.
That's where Livermore's DTEM comes in. It provides scientists with the ability to image transient behavior with an unprecedented combination of spatial and temporal resolution: nanometers and nanoseconds.
"Direct real-space observations of phase transformations on the nanosecond scale have allowed us to relate the formation mechanism in reactive multilayer foils to binary alloy solidification," Kim said. "This conclusion is based upon transient features that could not have been found using any other technique."
Because the team needed access to time and real-space that is impossible to study using traditional methods such as conventional in situ TEM (limited to video rates) or ultrafast diffraction (which presently lacks direct real-space imaging capabilities), the DTEM fit the bill.
"The ability to determine not only crystal structure, but also morphological evolution of dynamic events on the nanoscale has far-reaching implications for the study of materials science, non-equilibrium processes and the behavior of matter on very fine scales of length and time," Kim said.
Multilayer foils are layers of reactant materials that undergo exothermic, self-propagating reactions when layer mixing is caused by an external energy source. The foils show mobile, high-temperature reaction zones where atoms of adjoining layers diffuse across the interfaces. They are used as customized heat sources for rapid fuses, biological neutralization and joining materials via localized heating rather than global device heating.
LIVERMORE, Calif. - Researchers have achieved a milestone in materials science and electron microsco
Electron Microscopy Current Events and Electron Microscopy News RSSComputational microscope peers into the working ribosome
Two new studies reveal in unprecedented detail how the ribosome interacts with other molecules to assemble new proteins and guide them toward their destination in biological cells.
Small nanoparticles bring big improvement to medical imaging
If you're watching the complex processes in a living cell, it is easy to miss something important-especially if you are watching changes that take a long time to unfold and require high-spatial-resolution imaging.
Berkeley Researchers Take the Lead Out of Piezoelectrics
There is good news for the global effort to reduce the amount of lead in the environment and for the growing array of technologies that rely upon the piezoelectric effect.
Understanding mechanical properties of silicon nanowires paves way for nanodevices
Silicon nanowires are attracting significant attention from the electronics industry due to the drive for ever-smaller electronic devices, from cell phones to computers.
Engineers image nanostructure of a solid acid catalyst and boost its catalytic activity
The catalytic processes that facilitate the production of many chemicals and fuels could become much more environmentally friendly thanks to a breakthrough achieved by researchers from Lehigh and Rice Universities.
Breakthrough in industrial-scale nanotube processing
Rice University scientists today unveiled a method for the industrial-scale processing of pure carbon-nanotube fibers that could lead to revolutionary advances in materials science, power distribution and nanoelectronics.
Growing geodesic carbon nanodomes
Researchers analyzing the assembly of graphene (sheets of carbon only one atom thick) on a surface of iridium have found that the sheets grow by first forming tiny carbon domes.
Potential leap forward in electron microscopy
MIT electrical engineers have proposed a new scheme that can overcome a critical limitation of high-resolution electron microscopes: they cannot be used to image living cells because the electrons destroy the samples.
Toronto researchers discover novel circulation in human eye, new glaucoma treatment target
Researchers at the University of Toronto, St. Michael's Hospital and Sunnybrook Health Sciences Centre have discovered a previously unidentified form of circulation within the human eye which may provide important new insights into glaucoma, a leading cause of blindness.
Caltech scientists get detailed glimpse of chemoreceptor architecture in bacterial cells
Using state-of-the-art electron microscopy techniques, a team led by researchers from Caltech has for the first time visualized and described the precise arrangement of chemoreceptors-the receptors that sense and respond to chemical stimuli-in bacteria.
More Electron Microscopy Current Events and Electron Microscopy News Articles
 |
Electron Microscopy, 2nd Edition by John J. Bozzola (Author), Lonnie Dee Russell (Author) Electron Microscopy covers all of the important aspects of electron microscopy for biologists, including theory of scanning and transmission, specimen preparation, digital imaging and image analysis, laboratory safety and interpretation of images. The text also contains a complete atlas of ultrastructure. |
 |
Scanning Electron Microscopy and X-ray Microanalysis by Joseph Goldstein (Author), Dale E. Newbury (Author), David C. Joy (Author), Charles E. Lyman (Author), Patrick Echlin (Author), Eric Lifshin (Author), L.C. Sawyer (Author), J.R. Michael (Author) This text provides students as well as practitioners (engineers, technicians, physical and biological scientists, clinicians, and technical managers) with a comprehensive introduction to the field of scanning electron microscopy (SEM) and X-ray microanalysis. The authors emphasize the practical aspects of the techniques described. Topics discussed include user-controlled functions of scanning electron microscopes and x-ray spectrometers, the characteristics of electron beam - specimen interactions, image formation and interpretation, the use of x-rays for qualitative and quantitative analysis and the methodology for structural analysis using electron back-scatter diffraction. SEM sample preparation methods for hard materials, polymers, and biological specimens are covered in... |
|
Australian Electron Microscopy Newsletter by Aust Soc Electron Microscopy The Australian Electron Microscopy Newsletter reports on teaching and research in ion, electron, and laser microscopy and microanalysis. | |
 |
Electron Microscopy: Methods and Protocols (Methods in Molecular Biology) by John Kuo (Editor) In this revised and expanded second edition, Electron Microscopy: Methods and Protocols presents the newest technology in electron microscopy, while maintaining the practicality and accessibility of the acclaimed first edition. Like the first edition, this volume provides clear, concise instructions on processing biological specimens and includes discussion on the underlying principles of the majority of the processes presented. Each protocol is presented by experts with years of first-hand experience and in-depth knowledge of the techniques they describe. The Notes section accompanying each protocol will prove invaluable for adapting and troubleshooting protocols. Electron Microscopy: Methods and Protocols, Second Edition, comprises two major areas of electron... |
 |
Electron Microscopy of Toothbrush Tips X75 Photographic Poster Print, 24x18 by Art.com Art.com is the world's largest retailer of art prints, posters, photographs, and framed artwork. With our huge selection of over 400,000 prints, you'll easily find the perfect piece for your home, office, or classroom. Our art is printed on quality paper. When you order framed artwork, the piece is built by our team of in-house professionals. Visit our Amazon store today at www.amazon.com/artdotcom to find Special Offers and search for products based on 'Artist Name' and 'Subject Categories' such as Movie, Music, Vintage, TV, Children, Travel, Kitchen, Museum Art, Animals, Floral, Motivational, and Sports. Art.com is dedicated to providing you with high quality products and service by offering you 100% satisfaction guaranteed. We ship internationally to over 80 countries. Decorate your... |
 |
Histo-Mount, 100 mL () by Electron Microscopy HISTO-MOUNT. A mixture of xylene - mixed isomers and non hazardous ingredients to offer a very good synthetic mountant. Once dried the refractive index is 1.58. |
|
Using Microscopy: Electronic Microscopy: Transmission and Scanning EM [VHS] Starring: Paul Matsudaira | |
 |
Practical Electron Microscopy: A Beginner's Illustrated Guide by Elaine Evelyn Hunter (Author), Malcolm Silver (Foreword) This is an extensively illustrated laboratory manual of transmission electron microscopy techniques for the laboratory technician, graduate student, or researcher. Chapters begin with a general discussion, move on to the chemicals and equipment required for the method being described and conclude with a step-by-step presentation of the method and instructions for the preparation of solutions. Notes at the end of each chapter warn of possible pitfalls and outline "tricks of the trade". The methods and techniques outlined have been tested for over ten years in clinical and research laboratory situations, and are entirely reliable. Practical Electron Microscopy covers fixation, dehydration and embedding, semithin and thin sectioning, the electron microscope, and photography. For this new... |
|
Denshi Kenbikyo : Electron-Microscopy by Maruzen Co Ltd | |
 |
Transmission Electron Microscopy: A Textbook for Materials Science by David B. Williams (Author), C. Barry Carter (Author) This groundbreaking text has been established as the market leader throughout the world. Profusely illustrated now in full color throughout the text, Transmission Electron Microscopy: A Textbook for Materials Science provides the necessary instructions for successful hands-on application of this versatile materials characterization technique. For this first new edition in 12 years, many sections have been completely rewritten with all others revised and updated. The new edition also includes an extensive collection of questions for the student, providing approximately 800 self-assessment questions and over 400 questions that are suitable for homework assignment. Praise for the first edition: "The best textbook for this audience available." American Scientist ... |
| © 2009 BrightSurf.com |