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Material Measurement Laboratory

Chemical Sciences Division

Projects/Programs

Displaying 126 - 137 of 137
Schematic figure illustrating the principle of operation of a mass spectrometer, showing deflection of ions based on mass.

Theoretical Mass Spectrometry

Ongoing
No Description Intended Impact Unknown compounds will be identified more reliably. Quality control for the NIST Mass Spectrometry Database will be enhanced. Goals Develop software tools for predicting microcanonical branching fractions automatically. This is currently too laborious and too technical

Traceability in Molecular Spectrophotometry

Ongoing
This program, sometimes referred to as the Optical Filters program, has supported the development, certification, and (as specified) recertification of Standard Reference Materials ® (SRMs ®) for the verification of the transmittance (absorbance) and wavelength scales of spectrophotometers in the
Photography of gas cylinder storage facility with cylinders stored horizontally in movable cabinets.

Traceable Calibration Gases: SRMs, NTRMs, and Protocol Gases

Ongoing
The Gas Sensing Metrology Group prepares the highest level gas standards, known as Primary Standard Gas Mixtures based on precise gravimetric methods and accurate purity analysis. These Primary Standards are verified at NIST, stability confirmed through reanalysis over many years, and compared
Online video tutorials education button in Laptop notebook computer screen. Play lesson concept. Vector illustration

Tutorials in Analytical Chemistry

Ongoing
Topic Links Laboratory Operations and Sample Processing Use of Analytical Balances Video N/A Volumetric Transfer of Liquids Video PowerPoint Determination of Liquid Density Video PowerPoint Preparation of Calibration Solutions Video PowerPoint Soxhlet Extractions Video PowerPoint Pressurized Fluid
Illustration of three models with low, medium and high granularity.

Understanding Protein Solution Phase Behavior via Coarse-Grained Modeling

Ongoing
Intended Impact Because biological systems span a broad range of length and time scales, they cannot be studied effectively using conventional all-atom simulations. While hardware advances represent one route to improving the computational tractability of simulating biological systems, significant
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Validation of Density Functional Theory for Materials

Completed
A variety of systems will be considered in this work: Pure and alloy solids will be studied using periodic DFT methods with three distinct crystal structures that are relevant to the widely-used CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) method. This study emphasizes the
Dart biopsy collection from a free-ranging bottlenose dolphin

Vertebrate Endocrine Metrology in Non-Traditional Matrices

Ongoing
NIST collaborates with stakeholders to develop techniques for measuring hormone levels as part of animal health assessment. The process of capturing and transporting animals before sampling can induce stress, which may alter the hormone levels in the bloodstream. Therefore, the collection of blood
Figure with data points and lines, with the x axis labeled “unreliability” and the y axis labeled “error”.

Virtual Measurements

Ongoing
Intended Impact When engineering data, such as for reactive-chemical hazards, are obtained using quantum chemistry, the lack of associated uncertainties means that the reliability of the data is poorly known. Safety thus requires a skeptical view, often leading to expensive over-design. Objective
Photograph of SRM 972a Vitamin D metabolites in Frozen Human Serum showing a labeled box and four bottles labeled level 1 to level 4.

Vitamin D Metabolites Quality Assurance Program (VitDQAP)

Completed
Interlaboratory comparison studies of the VitDQAP supported the reliability of vitamin D measurements, including determination of 25-hydroxyvitamin D2, 25-hydroxyvitamin D3, and 3- epi-25-hydroxyvitamin D3 in human serum and plasma. Results from the comparison studies helped participants to make