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Microbially Mediated Method for Making Semiconductor Nanoparticles To address the commercial need for bulk production at a reasonable cost, ORNL researchers developed a microbially mediated method for the production of semiconductor nanoparticles. This invention also offers a means of microbial synthesis that yields a purer and more uniform product. Nanoparticles with metal non-oxide composition…

: Fact Sheets
: Production, Semiconductor, Metal...

High-Gradient Permanent Magnetic Separator for Particle Collection If inhaled into the respiratory system, nanometer-sized particulate pollutants may cause adverse health effects in humans. Commercially available particle collectors can monitor ambient air quality, worker health and safety, and process manufacturing, whereas personal particulate monitors equipped with small vacuum pumps are avail…

: Fact Sheets
: Particle, Centrifuge, Monitoring...

New Vapor-Particle Separator Improves Understanding of Aircraft Engine Combustion and Particulate Emissions A new apparatus has been developed by ORNL researchers to efficiently separate volatile particles from condensible vapors in aircraft engine emissions. The technology enables high-precision emissions research, generating insightful data that helps improve the scientific understanding of the…

Internal Labeling Technique Tracks Nanoparticle Transport To track the transport of nanoscale particles and core-shell particles in biological and environmental systems, ORNL researchers developed a way to insert a radioisotope or a fluorophore into the particle as an observable marker. Internalized labeling of nanoparticles leaves the surface intact and available for functionalization with a h…

: Fact Sheets
: Nanoparticle, Metal, Labeling...

Functionalized Gold Nanoparticles for Rapid, Ultra- sensitive Detection of Environmental Pollutants A rapid, highly sensitive, inexpensive method to detect and identify specific hazardous environmental pollutants has been invented by ORNL researchers. The method uses gold nanoparticles, modified and positively charged by an amine group, to identify hazards such as perchlorates, nitrates, and some…

: Fact Sheets

Genetically Modified Microorganisms with Enhanced Resistance to Acetate Efficient conversion of lignocellulose to alternative fuels is hindered by the difficulty of breaking down plant biomass. Pretreatment of materials is a necessary part of the production process; but during pretreatment, chemicals such as acetate form and inhibit or even stop fermentation. To address this challenge, ORNL resea…

Bioelectrochemical Waste Treatment Yields Hydrogen/Electricity Water scarcity is becoming a major issue for the United States and other countries as water use for agricultural and biofuel crops and industrial processes such as fracking increases. The issue is compounded by the fact that water used for food, fuel, and energy production results in large amounts of wastewater laden with organic comp…

Bacterial Fermentation Improves Metallic, Semiconducting Nanoparticle Production A team of researchers at ORNL has successfully developed a method for producing inorganic nanoparticles, and controlling their size and shape, using a bacterial fermentation process that employs chemicals to control bacterial synthesis. They subsequently built on that research by producing in large quantities semicon…

: Fact Sheets
: Nanoparticle, Oxide, Metal...

Multi-winding Homopolar Electric Machine Offers Variable Voltage at Low Rotational Speed A nineteenth century invention by Michael Faraday, the Faraday disc machine, has undergone a twenty-first century improvement at ORNL. Now known as a homopolar electric machine, the ORNL invention offers greater (and variable) voltage output at low rotational speeds without a gearbox. Previous designs have be…

: Fact Sheets
: Voltage, Machining, Design...

Microbial Fuel Cells Generate Energy While Clearing Biowaste from Water Developing the technology to generate energy from waste and renewable materials is becoming an increasingly important priority in the United States, as energy derived from fossil fuels is both expensive and environmentally harmful. Microbial fuel cells are an emerging technology for producing electricity directly from biodegr…

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