National Institute of Standards and Technology – Page 3

Multi-method analysis of multiwall carbon nanotube polymer nanocomposite after photodegradation

Petersen E.J., Lam T., Gorham J., Scott K., Long C., Sharma R., Sung L.P., Liddle J.A., Nguyen T., National Institute of Standards and Technology, US

Nanomaterials can be used as nanofillers to enhance the properties of polymeric materials. However, the effect of weathering on nanocomposites and the potential for nanomaterial release is not yet well known. This stems partly from [...]

Use of Single Particle Inductively Coupled Plasma Mass Spectrometry to Characterize a New Silver Nanoparticle Reference Material

Murphy K.E., Liu J., Guthrie W.F., Gorham J.M., Bonevich J.E., Allen A.J., Winchester M.R., Hackley V.A., MacCuspie R.I., National Institute of Standards and Technology, US

In this study we use a conventional inductively coupled plasma mass spectrometer operated in single particle mode (spICP-MS) to simultaneously characterize the size distribution and dissolved silver fraction of a new candidate silver nanoparticle reference [...]

3-D characterization of carbon nanotube-polymer composites using scanning electron microscopy and confocal Raman microscopy

Zhao M.H., Cannara R.J., National Institute of Standards and Technology, US

3D characterization of the dispersion of CNTs in a polymer matrix is a critical step toward understanding and improving the performance of CNT polymer composites. In this study, SEM and confocal Raman microscopy (CRM) were [...]

A Focused Super-Continuum Solar Simulator for Illuminated Solar Cell Microscopy

Dennis T., National Institute of Standards and Technology, US

The design and application of a novel, focused solar simulator based on a high-power, super-continuum laser is described. We used the simulator to create micrometer-scale spatial maps of full-spectrum optical beam induced current (FS-OBIC) in [...]

A Focused Super-Continuum Solar Simulator for Illuminated Solar Cell Microscopy

Dennis T., National Institute of Standards and Technology, US

The design and application of a novel, focused solar simulator based on a high-power, super-continuum laser is described. We used the simulator to create micrometer-scale spatial maps of full-spectrum optical beam induced current (FS-OBIC) in [...]

Surface Chemical Transformations of UV Irradiated Silica-Epoxy Nanocomposites

Gorham J.M., Nguyen T., Bernard C., Stanley D., Holbrook R.D., National Institute of Standards and Technology, US

Silica nanoparticles (SiNPs) incorporated into a polymeric matrix, or silica nanocomposites (NCs), are used in a wide variety of commercially available products in numerous natural and artificial environments. Environmental factors, such as ultraviolet (UV) light, [...]

Quantitative Assessment of Nanoparticle Induced Oxidative DNA Damage Using Isotope Dilution Mass Spectrometry

Petersen E.J., Marquis B.J., Jaruga P., Dizdaroglu M., Nelson B.C., National Institute of Standards and Technology, US

Hyphenated mass spectrometry (gas chromatography/mass spectrometry) techniques have been employed as one of the primary analytical tools for investigating the effects of ionizing radiation, chemical/biological carcinogens and oxygen derived free radicals on the induction and [...]

“Just Add Water” – “Instant” singly-dispersed suspensions of silver nanoparticles on demand

MacCuspie R.I., National Institute of Standards and Technology, US

The rapid pace of development of new nanomaterials and new applications has also attracted much attention from the environmental health and safety (EHS) risk assessment community. Subsequently, calls for well-characterized common test materials from a [...]

Oxidatively Induced Damage to DNA: Potential Roles of Single- and Multi-Wall Carbon Nanotubes at the Molecular Level

Nelson B.C., National Institute of Standards and Technology, US

Carbon nanotubes (CNTs) are remarkable materials in terms of their enhanced thermal and electrical conductivities, tensile strengths and mechanical properties. Because of these unique properties, the commercial development and application of CNTs in electronics, advanced [...]

Plasmonic nanodome array fabricated on plastic as a dual-mode surface plasmon resonance and surface-enhanced Raman scattering sensor

Choi C-J, Semancik S., National Institute of Standards and Technology, US

Label-free optical sensors have recently emerged as a highly sensitive approach for detecting a broad range of chemical and biological analytes that include illicit drug compounds, explosives, proteins, viruses, and bacteria.To best meet such diverse [...]