#Environmentally friendly lignin nanoparticle'greens'silver nanobullet to battle bacteria Researchers have developed an effective and environmentally benign method to combat bacteria by engineering nanoscale particles that add the antimicrobial potency of silver to a core of lignin,
a ubiquitous substance found in all plant cells. The findings introduce ideas for better, greener and safer nanotechnology and could lead to enhanced efficiency of antimicrobial products used in agriculture and personal care.
In a study being published in Nature Nanotechnology July 13, North carolina State university engineer Orlin Velev and colleagues show that silver-ion infused lignin nanoparticles,
which are coated with a charged polymer layer that helps them adhere to the target microbes,
effectively kill a broad swath of bacteria, including E coli and other harmful microorganisms. As the nanoparticles wipe out the targeted bacteria,
they become depleted of silver. The remaining particles degrade easily after disposal because of their biocompatible lignin core,
"People have been interested in using silver nanoparticles for antimicrobial purposes, but there are lingering concerns about their environmental impact due to the long-term effects of the used metal nanoparticles released in the environment,
"said Velev, INVISTA Professor of Chemical and Biomolecular engineering at NC State and the paper's corresponding author."
"The researchers used the nanoparticles to attack E coli, a bacterium that causes food poisoning; Pseudomonas aeruginosa, a common disease-causing bacterium;
The nanoparticles were effective against all the bacteria. The method allows researchers the flexibility to change the nanoparticle recipe in order to target specific microbes.
Alexander Richter, the paper's first author and an NC State Ph d. candidate who won a 2015 Lemelson-MIT prize,
"We used powerful nanomanufacturing strategies to fabricate an implant that lets us penetrate deep inside the brain with minimal damage,
When a laser shines on the surface of a silver cube just 75 nanometers wide,
Energy trapped on the surface of the nanocube in this fashion is called a plasmon. The plasmon creates an intense electromagnetic field between the silver nanocube
and a thin sheet of gold placed a mere 20 atoms away. This field interacts with quantum dotspheres of semiconducting material just six nanometers widehat are sandwiched in between the nanocube and the gold.
The quantum dots, in turn, produce a directional, efficient emission of photons that can be turned on and off at more than 90 gigahertz. here is great interest in replacing lasers with LEDS for short-distance optical communication,
The group is now working to use the plasmonic structure to create a single photon source necessity for extremely secure quantum communicationsy sandwiching a single quantum dot in the gap between the silver nanocube and gold foil.
When a laser shines on the surface of a silver cube just 75 nanometers wide,
Energy trapped on the surface of the nanocube in this fashion is called a plasmon. The plasmon creates an intense electromagnetic field between the silver nanocube
and a thin sheet of gold placed a mere 20 atoms away. This field interacts with quantum dotspheres of semiconducting material just six nanometers widehat are sandwiched in between the nanocube and the gold.
The quantum dots, in turn, produce a directional, efficient emission of photons that can be turned on and off at more than 90 gigahertz. here is great interest in replacing lasers with LEDS for short-distance optical communication,
is pushing pretty hard for. he group is now working to use the plasmonic structure to create a single photon source necessity for extremely secure quantum communicationsy sandwiching a single quantum dot in the gap between the silver nanocube and gold foil.
The researchers report in Nano Letters that by combining inorganic semiconductor nanocrystals with organic molecules, they have succeeded in pconvertingphotons in the visible and near-infrared regions of the solar spectrum. he infrared region of the solar
In their experiments, Bardeen and Tang worked with cadmium selenide and lead selenide semiconductor nanocrystals.
The cadmium selenide nanocrystals could convert visible wavelengths to ultraviolet photons while the lead selenide nanocrystals could convert near-infrared photons to visible photons.
In lab experiments, the researchers directed 980-nanometer infrared light at the hybrid material, which then generated upconverted orange yellow fluorescent 550-nanometer light,
almost doubling the energy of the incoming photons. The researchers were able to boost the upconversion process by up to three orders of magnitude by coating the cadmium selenide nanocrystals with organic ligands,
providing a route to higher efficiencies. his 550-nanometer light can be absorbed by any solar cell material,
Bardeen said. he key to this research is the hybrid composite material combining inorganic semiconductor nanoparticles with organic compounds.
Organic compounds cannot absorb in the infrared but are good at combining two lower energy photons to a higher energy photon.
By using a hybrid material, the inorganic component absorbs two photons and passes their energy on to the organic component for combination.
The researchers report in Nano Letters that by combining inorganic semiconductor nanocrystals with organic molecules, they have succeeded in pconvertingphotons in the visible and near-infrared regions of the solar spectrum. he infrared region of the solar
In their experiments, Bardeen and Tang worked with cadmium selenide and lead selenide semiconductor nanocrystals.
The cadmium selenide nanocrystals could convert visible wavelengths to ultraviolet photons while the lead selenide nanocrystals could convert near-infrared photons to visible photons.
In lab experiments, the researchers directed 980-nanometer infrared light at the hybrid material, which then generated upconverted orange yellow fluorescent 550-nanometer light,
almost doubling the energy of the incoming photons. The researchers were able to boost the upconversion process by up to three orders of magnitude by coating the cadmium selenide nanocrystals with organic ligands,
providing a route to higher efficiencies. his 550-nanometer light can be absorbed by any solar cell material,
Bardeen said. he key to this research is the hybrid composite material combining inorganic semiconductor nanoparticles with organic compounds.
Organic compounds cannot absorb in the infrared but are good at combining two lower energy photons to a higher energy photon.
By using a hybrid material, the inorganic component absorbs two photons and passes their energy on to the organic component for combination.
This schematic illustrates the novel nanosheet with three parallel segments created by the researchers each supporting laser action in one of three elementary colors.
The researchers have created a novel nanosheet a thin layer of semiconductor that measures roughly one-fifth of the thickness of human hair in size with a thickness that is roughly one-thousandth of the thickness of human hair with three
The researchers, engineers in ASU Ira A. Fulton Schools of Engineering, published their findings in the July 27 issue of the journal Nature Nanotechnology.
He and his graduate students turned to nanotechnology to achieve their milestone. The key is that at nanometer scale larger mismatches can be tolerated better than in traditional growth techniques for bulk materials.
High quality crystals can be grown even with large mismatch of different lattice constants. Recognizing this unique possibility early on,
Ning group started pursuing the distinctive properties of nanomaterials, such as nanowires or nanosheets, more than 10 years ago.
He and his students have been researching various nanomaterials to see how far they could push the limit of advantages of nanomaterials to explore the high crystal quality growth of very dissimilar materials.
Six years ago, under U s army Research Office funding, they demonstrated that one could indeed grow nanowire materials in a wide range of energy bandgaps
Later on they realized simultaneous laser operation in green and red from a single semiconductor nanosheet or nanowires.
and very different material properties. e have struggled for almost two years to grow blue emitting materials in nanosheet form,
'805-893-4765copyright University of California-Santa Barbaraissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
2015ultra-thin nanowires can trap electron'twisters'that disrupt superconductors February 24th, 2015simulating superconducting materials with ultracold atoms:
nanoscience, international chemistry March 5th, 2015magnetic vortices in nanodisks reveal information: Researchers from Dresden and Jlich use microwaves to read out information from smallest storage devices March 4th,
2015experiment and theory unite at last in debate over microbial nanowires: New model and experiments settle debate over metallic-like conductivity of microbial nanowires in bacterium March 4th,
2015magnetic vortices in nanodisks reveal information: Researchers from Dresden and Jlich use microwaves to read out information from smallest storage devices March 4th, 2015nanosorbents Increase Extraction, Recycling of Silver from Aqueous solutions March 4th, 201 1
#French Institutes IRT Nanoelec and CMP Team up to Offer World's First Service for Post-process 3d Technologies on Multi-Project-Wafer IRT Nanoelec,
an R&d consortium focused on ICT using micro-and nanoelectronics, and CMP, which provides prototyping
specifically, micro-and nanoelectronics. IRT Nanoelec, working within the framework of programs with investments on future technologies, leverages Grenoble proven innovation ecosystem to create the technologies that will power the nanoelectronics of tomorrow,
drive new product development and inspire new applications like the Internet of things for existing technologies. The R&d conducted at IRT Nanoelec provides early insight into how emerging technologies such as 3d integration
-and nanoelectronics competencies businesses will need to remain competitive in tomorrow global markets. IRT Nanoelec unique organization designed to keep pace with fast-changing markets offers its partners a more agile model than traditional public-private R&d partnerships.
and electron transport at the nanometer scale. Professor Cronin's research spans a broad range of topics including electrical and spectroscopic characterization of carbon nanotubes, graphene,
and many steps,"says Caltech physics professor Nai-Chang Yeh, the Fletcher Jones Foundation Co-Director of the Kavli Nanoscience Institute and the corresponding author of the new study."
"If you can strain graphene by design at the nanoscale, you can artificially engineer its properties.
'626-395-3227copyright#California Institute of Technologyissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
2015new nanowire structure absorbs light efficiently: Dual-type nanowire arrays can be used in applications such as LEDS and solar cells February 25th, 2015qd Vision Named Edison Award Finalist for Innovative Color IQ Quantum dot Technology
February 23rd, 2015flexible Electronics Breakthrough in OLED technology March 2nd, 2015discoveries 30 years after C60: Fullerene chemistry with silicon:
A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
and reduce damage on biomolecules and two-dimensional nanomaterials, such as graphene March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th,
Quantum dots are semiconducting materials that are small enough to exhibit quantum mechanical properties that only appear at the nanoscale.
The processes produce batches in specific sizes between 4. 5 and 70 nanometers in diameter.
and Angel Mart, an assistant professor of chemistry and bioengineering and of materials science and nanoengineering at Rice.
Tour is the T. T. and W. F. Chao Chair in Chemistry as well as a professor of materials science and nanoengineering and of computer science and a member of Rice's Richard E. Smalley Institute for Nanoscale Science and Technology.
'Copyright#Rice Universityissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
and reduce damage on biomolecules and two-dimensional nanomaterials, such as graphene March 18th, 2015news and information 30 years after C60:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015symmetry matters in graphene growth:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015'Smart bandage'detects bed sores before they are visible to doctors March 18th,
Columbia engineers invent nanoscale IC that enables simultaneous transmission and reception at the same frequency in a wireless radio March 14th,
2015optical nanoantennas set the stage for a NEMS lab-on-a-chip revolution February 24th, 2015qd Vision Named Edison Award Finalist for Innovative Color IQ Quantum dot Technology February 23rd,
The project is funded through the Flexible Resorbable Organic and Nanomaterial Therapeutic Systems (FRONTS) program of the National Science Foundation.##
'510-643-7741copyright#University of California, Berkeleyissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
2015nanomedicine Nanobiotix appoints its Manufacturing Partner, Cordenpharma: another step towards commercialization: New manufacturing unit increases production capacity 25 fold March 18th, 2015predicting prostate cancer:
Nanotechnology shows promise for more accurate prostate cancer screening and prognosis March 17th, 2015'Additive manufacturing'could greatly improve diabetes management March 17th, 2015nanotechnology Drug Delivery Market in the US 2012-2016:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
Fullerene chemistry with silicon: A long strived-for silicon dodecahedron synthesised at room temperature March 18th, 2015graphene'gateway'discovery opens possibilities for improved energy technologies March 18th, 2015clean energy future:
#NC State researchers create'nanofiber gusher':'Report method of fabricating larger amounts of nanofibers in liquid A simple process for batch
or continuous formation of polymer nanofibers and other nanomaterials in the bulk of a sheared fluid medium is introduced.
The process could be of high value to commercial nanotechnology as it can be scaled easily up to the fabrication of staple nanofibers at rates that could exceed tens of kilograms per hour.
Creating large amounts of polymer nanofibers dispersed in liquid is a challenge that has vexed researchers for years.
But engineers and researchers at North carolina State university and one of its start-up companies have reported now a method that can produce unprecedented amounts of polymer nanofibers
which have potential applications in filtration, batteries and cell scaffolding. In a paper published online in Advanced Materials,
describe the method that allows them to fabricate polymer nanofibers on a massive scale. The method-fine-tuned after nearly a decade of increasing success in producing micro
-and nanoparticles of different shapes-works as simply as dropping liquid solution of a polymer in a beaker containing a spinning cylinder.
you find a mat of nanofibers wrapped around it. When they first started investigating the liquid shearing process,
and nanoribbons as they investigated the process.""Microfibers, nanorods and nanoribbons are interesting and potentially useful,
but you really want nanofibers, "Velev said.""We achieved this during the scaling up and commercialization of the technology."
"Velev engaged with NC State's Office of Technology Transfer and the university's TEC (The Entrepreneurship Collaborative) program to commercialize the discoveries.
They worked with the experienced entrepreneur Miles Wright to start a company called Xanofi to advance the quest for nanofibers
"We can now create kilograms of nanofibers per hour using this simple continuous flow process,
which when scaled up becomes a'nanofiber gusher, '"Velev said.""Depending on the concentrations of liquids, polymers and antisolvents,
you can create multiple types of nanomaterials of different shapes and sizes.""""Large quantities are paramount in nanomanufacturing,
so anything scalable is said important Wright, the CEO of Xanofi and a co-author on the paper."
"When we produce the nanofibers via continuous flow, we get exactly the same nanofibers you would get
if you were producing small quantities of them. The fabrication of these materials in liquid is advantageous
because you can create truly three-dimensional nanofiber substrates with very, very high overall surface area. This leads to many enhanced products ranging from filters to cell scaffolds, printable bioinks, battery separators, plus many more."#
That's how modern chemistry bonds nanoparticles to a substrate Abstract: Nanoparticles of various types can be quickly
and permanently bonded to a solid substrate, if one of the most effective methods of synthesis, click chemistry, is used for this purpose.
gold nanoparticles to a glassy carbon substrate. The main idea of click chemistry was formulated in the final years of the previous century.
but to bond nanoparticles-i e. relatively large objects-to solid substrates.""Usually, nanoparticles are deposited simply on the substrate
and they attach to it by quite weak physical, for example electrostatic, interactions. We decided to show that with click chemistry they can be bonded to the substrate with covalent chemical bonds and thus permanently,"stresses Dr. Adam Le?
and the terminal alkynes were introduced onto the surface of gold nanoparticles. In earlier studies at the IPS PAS the catalyst participating in the reaction was produced chemically.
so that the suspension of gold nanoparticles in the solution surrounding the electrode remains stable while maintaining an appropriate concentration of copper two ions and supporting electrolyte.
In this environment, the production of the right catalyst, complexes of copper one and the bonding of nanoparticles itself to the substrate is very efficient,
Using a flow of current has shortened significantly the reaction time of the nanoparticles bonding to the substrate."
"We have been working with gold nanoparticles and carbon substrates, but our method is universal and in the future it can be used to produce substrates from other materials,"emphasises Dr. Niedzi?
What happens when a quantum dot looks in a mirror? Abstract: The 2014 chemistry Nobel prize recognized important microscopy research that enabled greatly improved spatial resolution.
This innovation, resulting in nanometer resolution, was made possible by making the source (the emitter) of the illumination quite small
Now, a new JQI study has shown how to sharpen nanoscale microscopy (nanoscopy) even more by better locating the exact position of the light source.
For visible light, diffraction limits the resolution to no be better than a few hundred nanometers. How then, can microscopy using visible light attain a resolution down to several nanometers?
By using tiny light sources that are no larger than a few nanometers in diameter. Examples of these types of light sources are fluorescent molecules, nanoparticles, and quantum dots.
The JQI work uses quantum dots which are tiny crystals of a semiconductor material that can emit single photons of light.
If such tiny light sources are close enough to the object meant to be mapped or imaged, nanometer scale features can be resolved.
This type of microscopy, called"Super-resolution imaging,"surmounts the standard diffraction limit. Image-dipole distortionsjqi fellow Edo Waks and his colleagues have performed nanoscopic mappings of the electromagnetic field profile around silver nanowires by positioning quantum dots (the emitter) nearby.
Previous work summarized at http://jqi. umd. edu/news/using-single-quantum dots-probe-nanowires. They discovered that sub-wavelength imaging suffered from a fundamental problem,
namely that an"image dipole"induced in the surface of the nanowire was distorting knowledge of the quantum dot's true position.
This uncertainty in the position of the quantum dot translates directly into a distortion of the electromagnetic field measurement of the object.
The distortion results from the fact that an electric charge positioned near a metallic surface will produce just such an electric field
The quantum dot does not have a net electrical charge but it does have a net electrical dipole, a slight displacement of positive and negative charge within the dot.
(as if the nanowire were acting as a sort of funhouse mirror). The JQI experiment successfully measured the image-dipole effect
The resulting work provides a more accurate map of the electromagnetic fields surrounding the nanowire. The JQI scientists published their results in the journal Nature Communications.
"Any time you use a nanoscale emitter to perform super-resolution imaging near a metal
'301-405-0989copyright#Joint Quantum Instituteissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
"Nanoscale probing of image dipole interactions in a metallic nanostructure,"Chad Ropp, Zachary Cummins, Sanghee Nah, John T. Fourkas, Benjamin Shapiro, Edo Waks
Tel aviv University researcher discovers novel nanoscale'metamaterial'could serve as future ultra-high-speed computing units March 19th, 2015an improved method for coating gold nanorods March 19th,
and reduce damage on biomolecules and two-dimensional nanomaterials, such as graphene March 18th, 2015rice fine-tunes quantum dots from coal:
2015iranian Scientists Apply Nanotechnology to Produce Electrical insulator March 7th, 2015new nanowire structure absorbs light efficiently: Dual-type nanowire arrays can be used in applications such as LEDS and solar cells February 25th,
2015ultra-thin nanowires can trap electron'twisters'that disrupt superconductors February 24th, 2015discoveries Quantum computing: 1 step closer with defect-free logic gate-Developing a new approach to quantum computing, based on braided quasiparticles as a logic gate to speed up computing,
first requires understanding the potential error-inducing factors March 19th, 2015click! That's how modern chemistry bonds nanoparticles to a substrate March 19th, 2015new optical materials break digital connectivity barriers:
Tel aviv University researcher discovers novel nanoscale'metamaterial'could serve as future ultra-high-speed computing units March 19th,
2015buckyballs become bucky-bombs: New creation could one day be used for demolition of cancer cells March 19th,
2015announcements NC State researchers create'nanofiber gusher':'Report method of fabricating larger amounts of nanofibers in liquid March 19th,
2015new optical materials break digital connectivity barriers: Tel aviv University researcher discovers novel nanoscale'metamaterial'could serve as future ultra-high-speed computing units March 19th, 2015an improved method for coating gold nanorods March 19th,
2015buckyballs become bucky-bombs: New creation could one day be used for demolition of cancer cells March 19th, 2015interviews/Book reviews/Essays/Reports/Podcasts/Journals/White papers Click!
That's how modern chemistry bonds nanoparticles to a substrate March 19th, 2015nc State researchers create'nanofiber gusher':
'Report method of fabricating larger amounts of nanofibers in liquid March 19th, 2015new optical materials break digital connectivity barriers:
Tel aviv University researcher discovers novel nanoscale'metamaterial'could serve as future ultra-high-speed computing units March 19th, 2015an improved method for coating gold nanorods March 19th,
2015tools XEI Scientific and University of Southern California announce a publication in Advanced Materials on the use of downstream plasma cleaning March 18th,
Nanotechnology shows promise for more accurate prostate cancer screening and prognosis Abstract: A Northwestern University-led study in the emerging field of nanocytology could one day help men make better decisions about
Backman has been studying cell abnormalities at the nanoscale in many different types of cancers, using an optical technique he pioneered called partial wave spectroscopic (PWS) microscopy.
PWS can detect cell features as small as 20 nanometers, uncovering differences in cells that
'847-491-4888copyright#Northwestern Universityissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
2015scientists discover gecko secret March 16th, 2015cancer NIH Grant to Keystone Nano to Target Nanoparticles to Cancer cells March 12th,
Latest Report Available by Radiant Insights, Inc March 16th, 2015silver implant nanotech killing infections: NC State Industrial & Systems Engineering Research Team Arms Implants With Battery-Activated Nanotechnology March 14th, 2015turmeric Extract Applied in Production of Antibacterial Nanodrugs March 12th,
2015discoveries Stable long term operation of graphene devices achieved (Kopie 1 march 17th, 2015maps predict strength of structures:
Distinguished University and Trustee Chair professor in the College of Engineering and director of its Nanomaterials Research Group, has created a two-dimensional carbon/sulfur nanolaminate that could be a viable candidate for use as a lithium-sulfur
along with his colleagues at Aix-Marseille University explain their process for extracting the nanolaminate from a three-dimensional material called a Ti2sc MAX phase.
The researchers found that carbon/sulfur nanolaminates have covalent bonding between carbon and sulfur and an extremely uniform distribution of sulfur between the atomically thin carbon layers.
Currently, sulfur infiltrated carbon nanomaterials have demonstrated to be the most promising cathode materials for Li-S batteries.
The carbon/sulfur nanolaminates synthesized by Gogotsi's group demonstrate the same uniformity as the infiltrated carbon nanomaterials,
but the sulfur in the nanolaminates is deposited uniformly in the carbon matrix as atomically thin layers
By using an electroless gold plating process with silver nanoparticles as a catalyst for an organic semiconductor,
which is achieved by applying a silver catalyst solution for plating that includes silver nanoparticles to an organic semiconductor crystal, after
In order to stably form electrodes for organic semiconductor crystals, EEJA developed new gold nanoparticles as an electroless plating catalyst.
#Nanotechnology Raises Possibility to Produce Strongest Commercial Pure Aluminum Alloy Iranian researchers from Amirkabir University of Technology in association with Spanish researchers presented a new process to obtain highly strong
The process was designed in a way that it enabled the researchers to produce nanocomposite and nanostructured metal at the same time.
while silicon carbide nanoparticles were used as the strengthening agent. Results of the research showed that aluminum
and silicon carbide nanoparticles with aver particle size of 55 nm as strengthening agents results in the production of aluminum-based nanocomposite with a strength of 284 MPA.
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