synthesis – TechConnect Briefs

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 [...]

Using Nanoparticle Scaffolds to Probe and Enhance the Catalytic Activity of Single and Coupled Enzyme Systems

Hastman D., Chiriboga M., Medintz I., U.S. Naval Research Laboratory, US

The use of nanoparticle (NP) scaffolds for enzymatic systems has proven to be a useful tool for sensing specific enzyme activity as well as enhancing the catalytic rates of these systems. Although, NP-induced enhancement has [...]

Scale-up of metal nanoparticle production

Stein M., Kruis F.E., University of Duisburg-Essen, DE

Metal nanoparticles are used in numerous products and applications to enhance their performance or efficiency. Different gas phase synthesis routes are known to form metal nanoparticles, however only few are capable for scaling-up in terms [...]

Microwave Initiated Nucleation for the Synthesis of High Quality Nanocrystalline Quantum Dot Materials

Kim K-J, Chang C.H., Haben P.M., Peterson D.A., Novet T.E., Schut D.M., Shoei Electronic Materials, Inc., US

The colloidal synthesis of nanoparticles, specifically quantum dots, may occur through either a kinetically dominated process where nucleation proceeds rapidly followed by growth via coalescence of nucleates to form larger nanoparticles, or through a thermodynamically [...]

Nanoparticles: Synthesis and Film Deposition Using a Simple and Fast Centrifuge Sedimentation Method

Wang J-S., Markelonis A.R., Wai C.M., Brown G.J., Air Force Research Laboratory, US

Gold nanoparticles were prepared by reduction of gold cations suspended in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) water-in-hexane microemulsions with another AOT microemulsion containing a reducing agent NaCNBH3. The size of the Au nanoparticles can be controlled by [...]

Interlayer interaction and disorder in Few Layer Graphene (FLG) powders prepared by fluidized bed chemical vapor deposition

Bacsa R., Bacsa W.S., Serp Ph., Lecante P., Pavlenko E., Cameán I., Ramos A., Garcia A.B., Bacsa R., Bacsa W.S., University of Toulouse, FR

The growth of few layer graphene (FLG) in powder form by CVD is particularly promising for its large scale production and use in composites as well as electrochemical and energy applications. The electronic and mechanical [...]

A novel mechanism for the synthesis of ultra-purified silver nanoparticles for the use in biomedical materials

Zuniga P., Chaves J.S., Chaves S.J., Chaves J.S., Chaves S.J., Universidad de Costa Rica and Instituto Tecnologico de Costa Rica, CR

Biomedical products are regulated by high standards of purity and quality compared to those that are not going to be linked to the human body. So it is a real challenge to incorporate a nanotechnological [...]

Ultrasonic Milling and Dispersing Technology for Inkjet Nano-Particles

Hielscher K., Hielscher Ultrasonics, DE

The application of mechanical stress – e.g. generated by ultrasonic cavitation - breaks the particle agglomerates apart. Also, liquid is pressed between the particles. Different technologies are commonly used for the dispersing of powders into [...]

Practical synthesis of nanomaterials and nanostructures

Rae A., Matteson J., Dansoh V., NanoMaterials Innovation Center, US

Nanoparticle and nanostructured coating synthesis is commonly hampered by complex processes or the need to use precursors which may not yet be registered under TSCA or REACH. There are, however, simple and practical processes using [...]

Growth of Uniform CNT Layer on Copper Foil-the Effect of Synthesis Methods/Conditions

Zhang Q., Scofield J., Tsao B., Merrett J.N., Quinton B.T., Burke J., Pierce N., University of Dayton, US

Carbon nanotubes (CNTs) with unique thermal/electrical/mechanical properties and large surface area are an attractive candidate for the integration into thermal structures and for a flexible thermal interface material in a thermal device. In this study, [...]