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Projects/Programs

Displaying 101 - 125 of 158

Nanometer Scale Measurements of Crack Tips in Glass

Ongoing
Our approach is to fracture glass samples under controlled conditions in order to elucidate fracture mechanisms. Specimen geometries with well-defined fracture mechanics behavior are used to propagate cracks at controlled velocities ranging from 10-11 m s-1 to 102 m s-1. Fracture surfaces are then

Nanoparticle Assembly in Complex Fluids

Completed
Engineered nanomaterials are promising for technological and medical purposes. However, molecular mechanisms of toxicology are less known. This presents a problem and barrier for future innovation and applications as new nanomaterials are developed for healthcare where particles are intentionally

Nanoscale Property Measurements by Atomic Force Microscopy

Ongoing
Over the past several decades, Atomic Force Microscopy (AFM) has advanced from a technique used primarily for surface topography imaging to one capable of characterizing a range of chemical, mechanical, electrical, and magnetic material properties with nanometer resolution. Such characterizations

Nanotube Metrology

Completed
Single-wall carbon nanotubes (SWCNTs) are a tubular form of carbon consisting of a single shell of sp2 bonded carbon with a nanometer scale diameter that have many predicted properties superior to other available materials. However, every production technique for SWCNTs produces many different

Nanotube Quality Control

Completed
Thermogravimetric analysis (TGA) is widely used to gather data on nanotube chemistry. By monitoring weight loss as a function of temperature, one can determine decomposition kinetics and use this data to closely approximate the distribution of impurities present in a few milligrams of material

NCAL: Diffraction Stress Measurement Under Applied Load

Ongoing
Using X-ray diffraction (XRD) techniques one can measure the full stress tensor just inside the surface of a sheet metal specimen under applied loading. This permits the measurement of biaxial stress states resulting from directly applied deformation (see NCAL: Multiaxial Material Performance) or

NCAL: Intermediate Strain Rate Testing

Ongoing
This project seeks to improve servohydraulic testing methods at intermediate strain rates by addressing the well-known problems associated with excessive stress oscillations (ringing) that currently limit our understanding of the mechanical behavior of engineering materials for loading conditions

NCAL: International Documentary Standards Activities

Ongoing
NIST Center for Automotive Lightweighting (NCAL) staff participate in many different international standards committees (e.g. ISO TC 164, ASTM E28 and D30); however, our main focus has been in the mechanical testing of metals and, to a lesser extent, composites. We work on the calibration and

NIST Combinatorial Methods Center (NCMC)

Completed
Established in 2002, the NCMC combines pioneering research and customer engagement to foster wide-spread adaptation of combinatorial and high-throughput methodologies. NCMC research addresses key challenges faced by polymer researchers who want to employ combi. In particular, the NCMC creates new

NIST Materials Resource Registry

Ongoing
The MRR is a comprehensive inventory of high-level data collections, repositories, databases, tools, software, and services useful to materials research and design but located anywhere in the world. Its specialization for Materials Science is in the domain-specific metadata and vocabulary it can

NIST Standard Reference Simulation Website

Ongoing
Molecular simulations, in particular Monte Carlo Molecular Simulation and Molecular Dynamics Simulation, are methods for computing the properties of some kind of system, for which the intermolecular interactions are specified via mathematical relationships derived from statistical mechanics. Since

OOF

Ongoing
The OOF project is a software development project designed to make advanced computational modeling capabilities available to materials science researchers who are not themselves computational experts. Researchers bring domain expertise from materials science to assist in building high-quality finite

Open Port Liquid Interface Mass Spectrometry

Ongoing
Rapid screening for chemical traces of explosives and narcotics is widely used to support homeland security and law enforcement. These target compounds span a range of physicochemical properties from organic to inorganic, with preferential ionization pathways in both negative and positive mode

OpenCALPHAD

Ongoing
Thermodynamic data are essential for the understanding, developing, and processing of materials. The CALPHAD technique has made it possible to calculate properties of multicomponent systems using databases of thermodynamic descriptions with models that were assessed from experimental data. The OC

Optical and Optoelectronic Materials Characterization

Ongoing
Today's electronics have reached a point where sheer computation power has combined form and function as the key driver of large consumer markets. The demand for portable and pervasive electronics with greater functionality promises significant changes over the next decades in how society interacts

Optical Probes of 2D Magnetic Phenomena

Ongoing
The unique measurement capabilities developed in this Project enable diffraction-limited, optical spectra (both Raman and photoluminescence) to be collected and analyzed as a function of laser energy, polarization, temperature, magnetic field, and device parameters such as current load and back

Particles, Tubes, and Colloids

Ongoing
Description A highlight of the PTC project is our success in purification of well-defined SWCNT populations using liquid phase separation methods. Although we use multiple techniques and methods, ion exchange chromatography, rate-zonal and isopycnic ultracentrifugation, size exclusion chromatography

Personal Body Armor

Completed
To quantify the impact of mechanical degradation on ballistic fibers, NIST developed a novel device for controlled folding of yarns and woven fabrics. In addition, we developed test protocols that employ single fibers to assess the effect of folding using a recently developed modified single fiber

Physical Infrastructure: Connections

Completed
The NIST Physical Infrastructure Program will provide the critical measurement science needed to assess the condition of aging physical infrastructure and guide cost-effective strategies for its maintenance, repair, and replacement. Infrastructure management challenges in the U.S. have received

Pipeline Safety

Ongoing
The U.S. operates more than 2.5M miles of natural gas, petroleum and hazardous liquid pipelines, crossing all 50 states and operated by more than 3,000 companies. Fluid hydrocarbon fossil fuels remain the world leading source of energy. The safest and most reliable means of transporting these fuels
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