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Materials

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Displaying 2151 - 2175 of 2347

Fabrication and Mechanical Characterization of Carbon Nanotube Based Nanoknives

November 5, 2006
Author(s)
Gurpreet Singh, Paul Rice, Richard J. McIntosh, Roop L. Mahajan
A prototype microtome knife for cutting 100 nm thick slices of frozen-hydrated biological samples has been constructed using multiwalled carbon nanotubes (MWCNT). A piezoelectric-based 3-D manipulator was used inside a Scanning Electron Microscope (SEM) to

Nanoparticle Lithography and Imaging Scanning Probe Microscopy

October 1, 2006
Author(s)
Jaroslaw Grobelny, De-Hao D. Tsai, Doo-In Kim, Pradeep N. Namboodiri, Robert F. Cook, Michael R. Zachariah
Scanning tunnelling microscopy (STM) imaging was performed on goldsurfaces with a large coverage of monodispersed silver nanoparticlessoft-landed on the surface from the gas phase. In both ambient and ultra-highvacuum conditions, STM scanning was found to

NIST Recommended Practice Guide: Fractography of Ceramics and Glasses

September 26, 2006
Author(s)
George D. Quinn
Fractography is a powerful but underutilized tool for the analysis of fractured glasses and ceramics. Fractography can identify the cause of failure and can even provide quantitative information about the loading conditions. The goal of this Guide is to

The 2005 Materials Research Society (MRS) Fall Meeting

September 18, 2006
Author(s)
Winnie K. Wong-Ng
The 2005 Materials Research Society (MRS) Fall Meeting took place in the Hynes Convention Center and the Sheration Boston Hotel, starting the weekend following the Thanksgivings Holidays from November 27 to December 2. This large-scale meeting included

Phase Formation and Properties in the System Bi2O 3:2CoO 1+x:Nb2O5

September 13, 2006
Author(s)
Terrell A. Vanderah, T Siegrist, M W. Lufaso, C Yeager, Juan C. Nino, S Yates, Robert S. Roth
Subsolidus phase relations have been determined for the Bi-Co-Nb-O system in air (750 C to 925 C). Ternary compound formation was limited to pyrochlore (A2B 2O 6O ), which formed a substantial solid solution region at Bi-deficient stoichiometries (relative

Crack Tip Opening Angle: Measurement and Modeling of Fracture Resistance in Low and High Strength Pipeline Steels

September 1, 2006
Author(s)
Philippe P. Darcis, Joseph D. McColskey, Christopher N. McCowan, Thomas A. Siewert, Gabriel Kohn, Arry Bussiba, Richard J. Fields
Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture, in cases where there is a large

Fatigue Crack Growth Rates in Five Pipeline Steels

September 1, 2006
Author(s)
Arry Bussiba, Philippe P. Darcis, J D. McCloskey, Christopher N. McCowan, Thomas A. Siewert, Gabriel Kohn, R P. Smith, J. Merritt
This study presents fatigue data for six different pipeline steels, with strengths ranging from Grade B to X100. A fatigue crack growth test for full-thickness pipeline samples was developed using a Middle Tension (MT) type specimen. The six steels showed

Second Symposium on Pendulum Impact Machines: Procedures and Specimens

August 1, 2006
Author(s)
Thomas A. Siewert, Christopher N. McCowan, M. P. Manahan
This publication consists primarily of the papers presented at the Second Symposium on Pendulum Impact Machines: Procedures and Specimens, sponsored by ASTM Committee E28 on Mechanical Testing and its Subcommittee E28.07 on Impact Testing. The Symposium

Phase Formation, Crystal Chemistry, and Properties in the Magnetic Dielectric System Bi 2 O 3- Fe 2 O 3- Nb 2 O 5

June 22, 2006
Author(s)
M W. Lufaso, Terrell A. Vanderah, I M. Pazos, Igor Levin, Juan C. Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Subsolidus phase relations have been determined for the Bi2O3-Fe2O3-Nb2O5 system in air (900-1075 C). Three new ternary phases were observed Bi3Fe0.5Nb1.5O9 with an Aurivillius-type structure, and two phases with approximate stoichiometries Bi17Fe2Nb31O106

An Octagonal Architecture for High Strength PIT Nb 3 Sn Conductors

June 6, 2006
Author(s)
L. R. Motowidlo, E Barzi, D. Turrioni, Najib Cheggour, Loren F. Goodrich
Powder-in-Tube (PIT) Nb 3Sn conductors have been fabricated utilizing a low-cost intermetallic Cu 5Sn 4 powder as the tin source. A novel octagonal PIT design that incorporates dispersion strengthened copper as well as a hexagonal PIT design were

Kinetics Governing Phase Separation of Nanostructured Sn(x)Ge(1a 'x) Alloys.

June 5, 2006
Author(s)
Regina Regan, Harry A. Atwater, Jonathan E. Guyer, Erik Meserole, Mark S. Gorrsky
We have studied the dynamic phenomenon of SnxGe1a 'x/Ge phase separation during deposition by molecular beam epitaxy on Ge(001) substrates.Phase-separation leads to the formation of direct bandgap semiconductor nanowire arrays embedded in Ge oriented along

Fatigue Resistant Miniature Piezoceramic Actuators

May 17, 2006
Author(s)
Stephanie A. Hooker, Jens Mueller, Clayton Kostelecky, K. Womer
Piezoelectric ceramics are desirable actuator materials for many biomedical applications due to their ability to generate precise, controlled motion with applied voltage. Herein, we report the fabrication of miniature piezoceramic actuators and their

Effect of Self-Assembled Monolayer Film Order on Nanofriction

May 11, 2006
Author(s)
S Sambasivan, S Hsieh, Daniel A. Fischer, Stephen M. Hsu
Self-assembled monolayers (SAMs) have increasingly being explored as potential protective films in devices friction and adhesion. However, accurate determination of the nanomechanical properties of monolayer films is difficult and fraught with

Anisotropic elastic properties of nanocrystalline nickel thin films

May 1, 2006
Author(s)
Donna C. Hurley, Roy H. Geiss, N Jennett, Malgorzata Kopycinska-Mueller, A Maxwell, Jens Mueller, David T. Read, J Wright
As length scales continue to shrink, new tools are needed to measure mechanical properties. We are developing two such tools using different nondestructive acoustical techniques. Surface acoustic wave spectroscopy (SAWS) uses laser-ultrasonic methods to

International Comparison of Impact Reference Materials (2004)

April 3, 2006
Author(s)
Christopher N. McCowan, G. Roebben, Y. Yamaguchi, S. Lefrancois, Jolene D. Splett, S. Takagi, A. Lamberty
A three-year horizontal comparison has been completed between national laboratories that certify specimens for the indirect verification of Charpy impact test machines. The participants in this study were the Institute for Reference Materials and
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