Feed aggregator

3D printed nanostructures made entirely of graphene

National Nanomanufacturing Network - December 12, 2014 - 3:49am
Graphene has received a great deal of attention for its promising potential applications in electronics, biomedical and energy storage devices, sensors and other cutting-edge technological fields, mainly because of its fascinating properties such as an extremely high electron mobility, a good thermal conductivity and a high elasticity.The successful implementation of graphene-based devices invariably requires the precise patterning of graphene sheets at both the micrometer and nanometer scale. Finding the ideal technique to achieve the desired graphene patterning remains a major challenge. 3D printing, also known as additive manufacturing, is becoming a viable alternative to conventional manufacturing processes in an increasing number of applications ranging from children toys to cars, fashion, architecture, military, biomedical science, and aerospace, to name a few. For the first time, researchers have now demonstrated 3D printed nanostructures composed entirely of graphene using a new 3D printing technique. The research team, led by Professor Seung Kwon Seol from Korea Electrotechnology Research Institute (KERI), has published their findings in the November 13, 2014 online edition of Advanced Materials ("3D Printing of Reduced Graphene Oxide Nanowires" (http://dx.doi.org/doi:10.1002/adma.201404380)) "We developed a nanoscale 3D printing approach that exploits a size-controllable liquid meniscus to fabricate 3D reduced graphene oxide (rGO) nanowires," Seol explains. "Different from typical 3D printing approaches which use filaments or powders as printing materials, our method uses the stretched liquid meniscus of ink. This enables us to realize finer printed structures than a nozzle aperture, resulting in the manufacturing of nanotructures." The researchers note that their novel solution-based approach is quite effective in 3D printing of graphene nanostructures as well as in multiple-materials 3D nanoprinting. "We are convinced that this approach will present a new paradigm for implementing 3D patterns in printed electronics," says Seol. For their technique, the team grew graphene oxide (GO) wires at room temperature using the meniscus formed at the tip of a micropipette filled with a colloidal dispersion of GO sheets, then reduced it by thermal or chemical treatment (with hydrazine). The deposition of GO was obtained by pulling the micropipette as the solvent rapidly evaporated, thus enabling the growth of GO wires. The researchers were able to accurately control the radius of the rGO wires by tuning the pulling rate of the pipette; they managed to reach a minimum value of ca. 150 nm. Using this technique, they were able to produce arrays of different freestanding rGO architectures, grown directly at chosen sites and in different directions: straight wires, bridges, suspended junctions, and woven structures. "So far, to the best of our knowledge, nobody has reported 3D printed nanostructures composed entirely of graphene," says Seol. "Several results reported the 3D printing (millimeter- or centimeter-scale) of graphene or carbon nanotube/plastic composite materials by using a conventional 3D printer. In such composite system, the graphene (or CNT) plays an important role for improving the properties of plastic materials currently used in 3D printers. However, the plastic materials used for producing the composite structures deteriorate the intrinsic properties of graphene (or CNT)." He points out that this 3D nanoprinting approach can be used for manufacturing 2D patterns and 3D architectures in diverse devices such as printed circuit boards, transistors, light emitting devices, solar cells, sensors and so on. Reducing the 3D printable size to below 10 nm and increasing the production yield still remain challenges, though. Source: Nanowerk (http://www.nanowerk.com/spotlight/spotid=38253.php)

Inviting articles: Special issue on Nanoinformatics (Beilstein Journal of Nanotechnology)

National Nanomanufacturing Network - December 12, 2014 - 3:16am
The Beilstein Journal of Nanotechnology (BJNANO, http://www.beilstein-journals.org/bjnano (http://www.beilstein-journals.org/bjnano)) invites you to submit papers on any aspect of Nanoinformatics to a Thematic Issue of BJNANO. BJNANO is a High Impact (SCI: 2.3) Open Access journal with No Publication Fees in the broad areas of Nanosciences and Nanotechnology. The BJNANO Thematic issue on Nanoinformatics will include, but are not limited to, the following topics: Data management and database development for nanomaterialsOntology and meta-data design for nanomaterial data Nanomaterial data standards and interoperation/sharing protocols Nanomaterial characterization (i.e., physicochemical/structural properties) Text/Literature mining for nanomaterial data collection and integrationAnalysis/Quantification for nano-images (e.g., TEM images of nanomaterials, images generated from in-vivo high-throughput screening of nano-bioactivity)Assessment of the value of information in nanomaterial dataData mining/Machine learning for nanomaterial data, particularly the development of (quantitative) structure-activity relationships for nanomaterialsSimulation for nanomaterial fate transport, nano-bio interactionsComputing applications for nanomedicine (e.g., drug delivery systems (nano-excipient), diagnosis and prevention, and safe disposal of nanomedicine as household goods)Visualization of nanomaterials dataEnvironmental and health risk assessment, life-cycle analysis, and regulatory decision making for nanomaterialsAssessment of ethical and social issues of nanotechnologyInfrastructure (frameworks/software/tools/resources) for nanoinformatics If you're interested in submitting papers to the thematic issue on Nanoinformtics, the deadline for the submission is: March 31, 2015. Submission instructions can be found at: http://www.beilstein-journals.org/bjnano/submission/submissionOverview.htm (http://www.beilstein-journals.org/bjnano/submission/submissionOverview.htm). When submitting, please also indicate in your cover letter that your paper is submitted for consideration by the thematic issue on Nanoinformatics. For further information regarding the thematic issue on nanoinformatics please contact Dr. Rong Liu (rliu.pro@gmail.com (mailto:rliu.pro@gmail.com)).

PETA science consortium to present at Society for Risk Analysis meeting

Nanotech-Now - December 11, 2014 - 7:45am
The PETA International Science Consortium, Ltd., will present at the annual meeting of the Society for Risk Analysis on a framework for optimizing nonanimal testing methods for nanomaterials. This pre...
Categories: Nanotechnology News

Keysight Technologies Further Reinvents Bench Testing With User-Centric Software

Nanotech-Now - December 11, 2014 - 7:45am
Keysight Technologies, Inc. (NYSE: KEYS) today introduced the next-generation of BenchVue, an intuitive, easy-to-use PC software application that provides multiple-instrument measurement visibility an...
Categories: Nanotechnology News

New Technique Could Harvest More of the Sun's Energy

Nanotech-Now - December 11, 2014 - 7:45am
As solar panels become less expensive and capable of generating more power, solar energy is becoming a more commercially viable alternative source of electricity. However, the photovoltaic cells now u...
Categories: Nanotechnology News

The gold standard

Nanotech-Now - December 11, 2014 - 7:45am
Precious elements such as platinum work well as catalysts in chemical reactions, but require large amounts of metal and can be expensive. However, computational modeling below the nanoscale level may...
Categories: Nanotechnology News

Polymeric Drug Carrier Produced in Iran for Target Delivery System

Nanotech-Now - December 11, 2014 - 7:45am
In this research, biodegradable polymers have been used in the production of nanocarrier, which enable the release of drug by controlling changes in temperature. The production and characterization of...
Categories: Nanotechnology News

Simple, Biocompatible Method Developed for Production of Cerium Oxide Nanoparticles

Nanotech-Now - December 11, 2014 - 7:45am
Iranian researchers from Mashhad University of Medical Sciences proposed a simple, cost-effective and fast method to produce metal oxide nanoparticles, which is in agreement with the basics of green c...
Categories: Nanotechnology News

Stretchy copper patch provides pain relief

Nanotechweb - December 11, 2014 - 4:36am
Metallic-based film could be a real alternative to conventional warm gel and thermal packs for alleviating the pain caused by everyday sprains and strains, and might even help patients suffering from arthritis.
Categories: Nanotechnology News

Laser light purifies nanotube mix

Nanotechweb - December 9, 2014 - 9:15am
2500 nm wavelength IR beam separates out semiconducting single-walled carbon nanotubes from a mix of both semiconducting and metallic thanks to a phenomenon called thermocapillary flow.
Categories: Nanotechnology News

Detecting gases wirelessly and cheaply: New sensor can transmit information on hazardous chemicals or food spoilage to a smartphone

Nanotech-Now - December 9, 2014 - 7:45am
MIT chemists have devised a new way to wirelessly detect hazardous gases and environmental pollutants, using a simple sensor that can be read by a smartphone.
Categories: Nanotechnology News

Unusual Electronic State Found in New Class of Unconventional Superconductors: Finding gives scientists a new group of materials to explore to unlock secrets of some materials' ability to carry current with no energy loss

Nanotech-Now - December 9, 2014 - 7:45am
A team of scientists from the U.S. Department of Energy's (DOE) Brookhaven National Laboratory, Columbia Engineering, Columbia Physics and Kyoto University has discovered an unusual form of electronic...
Categories: Nanotechnology News

New technique allows low-cost creation of 3-D nanostructures

Nanotech-Now - December 9, 2014 - 7:45am
Researchers from North Carolina State University have developed a new lithography technique that uses nanoscale spheres to create three-dimensional (3-D) structures with biomedical, electronic and pho...
Categories: Nanotechnology News

High photosensitivity 2D-few-layered molybdenum diselenide phototransistors

Nanotech-Now - December 9, 2014 - 7:45am
Two-dimensional (2D) layered materials are now attracting a lot of interest due to their unique optoelectronic properties at atomic thicknesses. Among them, graphene has been mostly investigated, but...
Categories: Nanotechnology News

Biomimetic dew harvesters: Understanding how a desert beetle harvests water from dew could improve drinking water collection in dew condensers

Nanotech-Now - December 9, 2014 - 7:45am
Insects are full of marvels - and this is certainly the case with a beetle from the Tenebrionind family, found in the extreme conditions of the Namib desert. Now, a team of scientists has demonstrated...
Categories: Nanotechnology News

Nanosensor to Detect Naproxen Drug Produced in Iran

Nanotech-Now - December 9, 2014 - 7:45am
Iranian researchers from Shiraz University produced a nanosensor during a laboratorial research which can be used in measuring naproxen drug.
Categories: Nanotechnology News

Membrane nano-tomography in living cells: Label-free evanescent microscopy enables full-field and real-time tracking of membrane processes without signal fading and cell perturbation

Nanotech-Now - December 9, 2014 - 7:45am
Membranes play a pivotal role in numerous cell mechanisms, in particular for internalization, adhesion and motility studies. In terms of optical imaging of the membrane, special configurations are nee...
Categories: Nanotechnology News

Endomagnetics receives IDE approval to initiate US trials

Nanotech-Now - December 9, 2014 - 7:45am
Cancer healthcare company Endomagnetics announced today that it has received Investigational Device Exemption (IDE) approval from the United States Food and Drug Administration (FDA) to initiate a piv...
Categories: Nanotechnology News

SUNY NanoCollege Celebrates Winter Commencement: Graduates To Pursue High-Tech Career And Educational Opportunities In New York State

Nanotech-Now - December 9, 2014 - 7:45am
As a testament to Governor Andrew Cuomo's innovation-driven agenda for strengthening New York State's high-tech workforce, thirty-two students at SUNY Polytechnic Institute's Colleges of Nanoscale Sci...
Categories: Nanotechnology News

Light propagation in solar cells made visible

Nanotech-Now - December 9, 2014 - 7:45am
How can light which has been captured in a solar cell be examined in experiments? Jülich scientists have succeeded in looking directly at light propagation within a solar cell by using a trick. The ph...
Categories: Nanotechnology News