National Institute of Standards and Technology

Discriminated properties of PEI functionalized gold nanoparticles (Au-PEIs) predetermined by synthetic routes of ligand exchange and reduction processes: Paths and Fates

Cho T.J., Gorham J.M., Pettibone J.M., Hackley V.A., National Institute of Standards and Technology, US

Polyethyleneimine (PEI) functionalized AuNPs (Au-PEIs) have potential use as positively charged gold nanoparticles (AuNPs) for nano-medicinal applications, due to their cationic surfaces that promote cellular uptake and gene transfection.1-6 Au-PEIs can be prepared by one [...]

A Programmable Transmission Electron Detector for Nanomaterials Characterization in a Scanning Electron Microscope

Holm J., Caplins B., Keller R., National Institute of Standards and Technology, US

A new programmable detector for scanning transmission electron microscopy (p-STEM) is described. A digital micromirror array lies at the heart of the detector and serves as a programmable virtual objective aperture. Two sensors, a photomultiplier [...]

Physical and Chemical Transformations of Silver Nanomaterial-containing Textiles After Use

Gorka D.E., Gorham J.M., National Institute of Standards and Technology, US

Nanomaterials have been increasingly used in consumer products and silver nanomaterials (AgNMs) especially have been used for their antibacterial properties. Increased use of AgNMs in consumer goods will result in increased disposal and entrance into [...]

Physical and chemical transformations of silver nanomaterials in textiles after use

Gorka D.E., Gorham J.M., National Institute of Standards and Technology, US

Nanomaterials have been increasingly used in consumer products and silver nanomaterials (AgNMs) especially have been used for their antibacterial properties. Increased use of AgNMs in consumer products will result in their increased disposal and entrance [...]

Positively charged Ag-dendron conjugates: Stability enhanced AgNPs for biomedical applications

Cho T.J., Liu J., Hackley V.A., National Institute of Standards and Technology, US

We developed positively charged silver nanoparticles ([Ag-Ds]+), nominally 20 nm in diameter, using dendron chemistry combined with reduction of silver nitrate in the presence of sodium borohydride. The conjugate was developed within the context of [...]

Characterization of Nanosilica Release from a Weathered Nanosilica/Polyurethane Coating

Hsueh H-C, Lu C-Y, Huang S-R, Cheng Y.L., Jacobs D., Rabb S.A., Yu L.L., Nguyen T., Sung L., National Institute of Standards and Technology, US

Polymer nanocoatings are widely used outdoor environment because the excellent properties. The addition of nanoparticles can improve performance properties including mechanical, electrical, chemical and ultraviolet resistance. However, because polymer in coating are susceptible to degradation [...]

Performance and Aging of Graphene Oxide/Polyurethane Nanocomposites

Goodwin Jr. D.G., Bernard C., Stanley D., Nguyen T., Sung L., National Institute of Standards and Technology, US

Graphene oxide (GO) can be used to enhance the properties and extend the service life of polymer nanocomposites (PNCs). GO is a good nanofiller candidate for water-borne polyurethane (WBPU) coatings since GO has outstanding physicochemical [...]

Moisture Uptake Characterization in Nanocellulose Using Microwave Cavity

Emiroglu C.D., Natarajan B., Gillman J.W., Liddle J.A., Obrzut J., National Institute of Standards and Technology, US

Nanocellulose has been a continuously emerging area of interest over the recent years due to inexpensive, abundant, and renewable nature of the material source. Cellulose nanocrystals (CNCs) are regarded to be highly useful candidates as [...]

Progress towards total structure control in SWCNT populations

Fagan J., National Institute of Standards and Technology, US

As-synthesized single-wall carbon nanotube (SWCNT) populations contain substantial distributions of SWCNT structures, including in the distribution of species ((n,m) chiralities) and enantiomers (i.e. the handedness of the lattice vector), as well as in their lengths, [...]

Quantitative Analysis of Oxidation State in Cerium Oxide Nanomaterials

Sims C.M., Maier R.A., Johnston-Peck A.C., Gorham J.M., Hackley V.A., Nelson B.C., National Institute of Standards and Technology, US

Of the many engineered nanomaterials being incorporated into our society, cerium oxide (ceria, CeO2-x) based nanomaterials (NMs) are receiving increased attention due to their unique chemical properties and vast number of current and potential applications [...]