#Physicists fine-tune control of agile exotic materials: Tunable hybrid polaritons realized with graphene layer on hexagonal boron nitride Abstract:
Physicists have found a way to control the length and strength of waves of atomic motion that have promising potential uses such as fine-scale imaging and the transmission of information within tight spaces.
The researchers measured waves called polaritons that can emerge when light interacts with matter. By combining two materials, they produced hybrid polaritons that propagate throughout many layers of a crystalline material
and can be controlled with a simple electrical gate. The team, led by Dimitri Basov and Michael Fogler, professors of physics at the University of California,
San diego, report their success in Nature Nanotechnology.""Our work demonstrates new properties of polaritonic waves can be achieved by artificially combining different materials,
"said Siyuan Dai, a graduate student in Basov's group responsible for much of the experimental work,
and the lead author of the report.""The hybrid polaritons are stronger and can propagate longer
and thus have greater potential in applications.""This collaborative team was one of two to first demonstrate polaritons in single-atom layers of carbon called graphene.
In graphene, infrared light launches ripples through the electrons at the surface of this metallike material called surface plasmon polaritons that the researchers were able to control using a simple electrical circuit.
Infrared light can also launch polaritons within a different type of two-dimensional crystal called hexagonal boron nitride.
Waves of atomic motion called phonon polaritons propagate throughout slabs of hbn formed by stacks of the sheetlike crystals.
but can be tuned with an electronic gate. The two kind of polaritons become coupled, a theoretical consideration determined and experimental evidence confirmed.
It fits the definition of a metamaterial, a class of structures first realized at UC San diego 15 years ago that is beginning to be expoited for potential practical use."
"Our structures are made from the new wonder material graphene and its cousin boron nitride, which endow them with several advantages compared to traditional metal-based metamaterials.
The key advantages include enormous degree of tunability, relatively low losses, and ultrasmall thickness,"Fogler said."
"We have demonstrated now an entirely new class of electromagnetic metamaterials that are fabricated from separate atomic planes of Van der waals materials,
"Electromagnetic metamaterials are revolutionizing imaging and sensor technologies. Since the initial demonstration these systems have advanced already to practical applications."#
"##Co-authors include researchers from MIT, TU Delft, Japan's National Institute for Materials science and Ludwig-Maximilians University.
The U s. Deparment of Energy, Air force Office of Scientific research and the Moore Foundation funded the work.
'858-246-0161copyright University of California-San Diegoissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
News and information n-tech Research Issues Report on Smart Coatings Market, Free Download Available on Firms Website June 24th, 2015nni Publishes Workshop Report and Launches
Web portal on Nanosensors: Both outputs support the Nanotechnology Signature Initiative Nanotechnology for Sensors and Sensors for Nanotechnology:
Improving and Protecting Health, Safety, and the Environment June 24th, 2015university of Tehran to Host 12th Int'l Confab on Membrane Science, Technology (MST2015) June 23rd, 2015iranian Scientists Design Nano Device
to Detect Cyanogen Toxic Gas June 23rd, 2015imaging Robust new process forms 3-D shapes from flat sheets of graphene June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:
New technique creates multilayered, self-assembled grids with fully customizable shapes and compositions June 23rd,
2015rmc-Boeckeler Introduces LN-Ultra Cryosectioning System for Serial Section Applications June 19th, 2015physics Superslippery islands (but then they get stuck):
A simple reversible process that changes friction in the nanoworld June 22nd, 2015graphene heat-transfer riddle unraveled June 17th, 2015framework materials yield to pressure June 11th, 2015govt.
-Legislation/Regulation/Funding/Policy NNI Publishes Workshop Report and Launches Web portal on Nanosensors: Both outputs support the Nanotechnology Signature Initiative Nanotechnology for Sensors and Sensors for Nanotechnology:
Improving and Protecting Health, Safety, and the Environment June 24th, 2015nanoparticle'wrapper'delivers chemical that stops fatty buildup in rodent arteries Experimental therapy restores normal fat metabolism in animals with atherosclerosis June 23rd,
2015robust new process forms 3-D shapes from flat sheets of graphene June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:
New technique creates multilayered, self-assembled grids with fully customizable shapes and compositions June 23rd,
2015chip Technology Harris & Harris Group Portfolio Company D-Wave Systems Announces 1, 000 Qubit Processor and Is discussed in the Economist June 23rd,
2015leti to Present Solutions to New Applications Using 3d Technologies at SEMICON West Letiday Event, July 14:
Leti Experts also Will Speak at Techxpot Session on MEMS and STS Session on Lithography Cost-and-Productivity Issues Below 14nm June 22nd, 2015fabricating inexpensive, high-temp SQUIDS for future
electronic devices June 22nd,2015$8. 5m Grant For Developing Nano Printing Technology: 4-D printing to advance chemistry, materials sciences and defense capabilities June 18th, 2015discoveries Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together
nanoscale geometric grids: New technique creates multilayered, self-assembled grids with fully customizable shapes and compositions June 23rd,
2015newly-Developed Biosensor in Iran Detects Cocaine addiction June 23rd, 2015iranian Scientists Design Nano Device to Detect Cyanogen Toxic Gas June 23rd, 2015materials/Metamaterials n-tech Research Issues Report on Smart Coatings Market
, Free Download Available on Firms Website June 24th, 2015uk Graphene Open for Business with Asia June 23rd,
2015robust new process forms 3-D shapes from flat sheets of graphene June 23rd, 2015bacteria Cellulose,
Natural Polymers with Applications in Various Industries Synthesized in Iran June 22nd, 2015announcements n-tech Research Issues Report on Smart Coatings Market,
Free Download Available on Firms Website June 24th, 2015nni Publishes Workshop Report and Launches Web portal on Nanosensors:
Both outputs support the Nanotechnology Signature Initiative Nanotechnology for Sensors and Sensors for Nanotechnology: Improving and Protecting Health, Safety,
and the Environment June 24th, 2015university of Tehran to Host 12th Int'l Confab on Membrane Science, Technology (MST2015) June 23rd, 2015iranian Scientists Design Nano Device
to Detect Cyanogen Toxic Gas June 23rd, 2015interviews/Book reviews/Essays/Reports/Podcasts/Journals/White papers n-tech Research Issues Report on Smart Coatings Market
, Free Download Available on Firms Website June 24th, 2015nni Publishes Workshop Report and Launches Web portal on Nanosensors:
Both outputs support the Nanotechnology Signature Initiative Nanotechnology for Sensors and Sensors for Nanotechnology: Improving and Protecting Health, Safety,
and the Environment June 24th, 2015newly-Developed Biosensor in Iran Detects Cocaine addiction June 23rd, 2015iranian Scientists Design Nano Device to Detect Cyanogen Toxic Gas June 23rd,
2015military Iranian Scientists Design Nano Device to Detect Cyanogen Toxic Gas June 23rd, 2015scientists Create Synthetic Membranes That Grow Like Living Cells June 22nd,
2015discovery paves way for new kinds of superconducting electronics June 22nd, 2015researchers first to show that Saharan silver ants can control electromagnetic waves over an extremely broad range of the electromagnetic spectrumfindings may lead to biologically inspired coatings for passive radiative cooling of objects June 19th,
2015grants/Awards/Scholarships/Gifts/Contests/Honors/Records Robust new process forms 3-D shapes from flat sheets of graphene June 23rd,
2015lancaster University revolutionary quantum technology research receives funding boost June 22nd, 2015graphene heat-transfer riddle unraveled June 17th,
2015world's thinnest lightbulb--graphene gets bright! Columbia engineers and colleagues create bright, visible light emission from one-atom thick carbon June 15th,
2015research partnerships Lancaster University revolutionary quantum technology research receives funding boost June 22nd, 2015fabricating inexpensive, high-temp SQUIDS for future electronic devices June 22nd,
2015researchers first to show that Saharan silver ants can control electromagnetic waves over an extremely broad range of the electromagnetic spectrumfindings may lead to biologically inspired coatings for passive radiative cooling of objects June 19th, 2015biomedical breakthrough:
Carbon nanoparticles you can make at home June 18th, 201 0
#Biomanufacturing of Cds quantum dots: A bacterial method for the low-cost, environmentally-friendly synthesis of aqueous soluble quantum dot nanocrystals Abstract:
A team of Lehigh University engineers have demonstrated a bacterial method for the low-cost, environmentally friendly synthesis of aqueous soluble quantum dot (QD) nanocrystals at room temperature.
Principal researchers Steven Mcintosh, Bryan Berger and Christopher Kiely, along with a team of chemical engineering, bioengineering,
and material science students present this novel approach for the reproducible biosynthesis of extracellular, water-soluble QDS in the July 1 issue of the journal Green Chemistry.
This is the first example of engineers harnessing nature's unique ability to achieve cost effective and scalable manufacturing of QDS using a bacterial process.
Using an engineered strain of Stenotrophomonas maltophilia to control particle size the team biosynthesized QDS using bacteria
and cadmium sulfide to provide a route to low-cost, scalable and green synthesis of Cds nanocrystals with extrinsic crystallite size control in the quantum confinement range.
The solution yields extracellular, water-soluble quantum dots from low-cost precursors at ambient temperatures and pressure.
The result is Cds semiconductor nanocrystals with associated size-dependent band gap and photoluminescent properties. This biosynthetic approach provides a viable pathway to realize the promise of green biomanufacturing of these materials.
The Lehigh team presented this process recently to a national showcase of investors and industrial partners at the Techconnect 2015 World Innovation Conference and National Innovation Showcase in Washington
D c. June 14-17.""Biosynthetic QDS will enable the development of an environmentally-friendly, bio-inspired process unlike current approaches that rely on high temperatures, pressures, toxic solvents and expensive precursors,
"Berger says.""We have developed a unique, 'green'approach that substantially reduces both cost and environmental impact."
"Quantum dots, which have use in diverse applications such as medical imaging, lighting, display technologies, solar cells, photocatalysts, renewable energy and optoelectronics, are typically expensive and complicated to manufacture.
In particular, current chemical synthesis methods use high temperatures and toxic solvents, which make environmental remediation expensive and challenging.
This newly described process allows for the manufacturing of quantum dots using an environmentally benign process and at a fraction of the cost.
Whereas in conventional production techniques QDS currently cost $1, 000-$10, 000 per gram, the biomanufacturing technique cuts that cost to about $1-$10 per gram.
The substantial reduction in cost potentially enables large-scale production of QDS viable for use in commercial applications."
"We estimate yields on the order of grams per liter from batch cultures under optimized conditions,
and are able to reproduce a wide size range of Cds QDS, "said Steven Mcintosh.
The research is funded by the National Science Foundation's Division of Emerging Frontiers in Research
and Innovation (EFRI Grant No. 1332349) and builds on the success of the initial funding,
supplied by Lehigh's Faculty Innovation Grant (FIG) and Collaborative Research Opportunity Grant (CORE) programs.
The Lehigh research group is also investigating, through the NSF's EFRI division, the expansion of this work to include a wide range of other functional materials.
Functional materials are controlled those with composition size, and structure to facilitate desired interactions with light, electrical or magnetic fields,
or chemical environment to provide unique functionality in a wide range of applications from energy to medicine.
Mcintosh said, "While biosynthesis of structural materials is established relatively well, harnessing nature to create functional inorganic materials will provide a pathway to a future environmentally friendly biomanufacturing based economy.
We believe that this work is the first step on this path."#"##The research was conducted by principal investigators Mcintosh, Berger,
and Kiely along with Zhou Yang and Victoria F. Bernard of the Department of Chemical and Biomolecular engineering;
as well as Li Lu and Qian He of the Department of Materials science and engineering, all from Lehigh.#####For more information, please click herecontacts:
Jordan Reesewriteemail('lehigh. edu','jor310';'610-758-6656copyright Lehigh Universityissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.
Bookmark: Full article in Green Chemistry: News and information Scientists highlight the importance of nanoscale hybrid materials for noninvasive cancer diagnosis June 24th,
2015physicists fine-tune control of agile exotic materials: Tunable hybrid polaritons realized with graphene layer on hexagonal boron nitride June 24th, 2015n-tech Research Issues Report on Smart Coatings Market, Free Download Available on Firms Website June 24th,
2015nni Publishes Workshop Report and Launches Web portal on Nanosensors: Both outputs support the Nanotechnology Signature Initiative Nanotechnology for Sensors and Sensors for Nanotechnology:
Improving and Protecting Health, Safety, and the Environment June 24th, 2015discoveries Scientists highlight the importance of nanoscale hybrid materials for noninvasive cancer diagnosis June 24th,
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2015newly-Developed Biosensor in Iran Detects Cocaine addiction June 23rd, 2015iranian Scientists Design Nano Device to Detect Cyanogen Toxic Gas June 23rd,
2015materials/Metamaterials Physicists fine-tune control of agile exotic materials: Tunable hybrid polaritons realized with graphene layer on hexagonal boron nitride June 24th, 2015n-tech Research Issues Report on Smart Coatings Market, Free Download Available on Firms Website June 24th,
2015uk Graphene Open for Business with Asia June 23rd, 2015robust new process forms 3-D shapes from flat sheets of graphene June 23rd,
2015announcements Scientists highlight the importance of nanoscale hybrid materials for noninvasive cancer diagnosis June 24th, 2015physicists fine-tune control of agile exotic materials:
Tunable hybrid polaritons realized with graphene layer on hexagonal boron nitride June 24th, 2015n-tech Research Issues Report on Smart Coatings Market, Free Download Available on Firms Website June 24th,
2015nni Publishes Workshop Report and Launches Web portal on Nanosensors: Both outputs support the Nanotechnology Signature Initiative Nanotechnology for Sensors and Sensors for Nanotechnology:
Improving and Protecting Health, Safety, and the Environment June 24th, 2015interviews/Book reviews/Essays/Reports/Podcasts/Journals/White papers Scientists highlight the importance of nanoscale hybrid materials for noninvasive cancer diagnosis June 24th,
2015physicists fine-tune control of agile exotic materials: Tunable hybrid polaritons realized with graphene layer on hexagonal boron nitride June 24th, 2015n-tech Research Issues Report on Smart Coatings Market, Free Download Available on Firms Website June 24th,
2015nni Publishes Workshop Report and Launches Web portal on Nanosensors: Both outputs support the Nanotechnology Signature Initiative Nanotechnology for Sensors and Sensors for Nanotechnology:
Improving and Protecting Health, Safety, and the Environment June 24th, 2015quantum Dots/Rods Iranian Researchers Model, Design Optical Switches June 13th, 2015lehigh University researchers unveil engineering innovations at Techconnect 2015:
Techconnect is the world's largest accelerator for industry-vetted emerging-technologies ready for commercialization June 11th, 2015investigation of Optical Properties of Quantum dots in Presence of Magnetic, Electrical Fields June 10th,
2015next-generation illumination using silicon quantum dot-based white-blue LED June 7th, 201 0
#World#s 1st Full-Color, Flexible, Skin-Like Display Developed at UCF A breakthrough in a University of Central Florida lab has brought those scenarios closer to reality.
A team led by Professor Debashis Chanda of UCF Nanoscience Technology Center and the College of Optics and Photonics (CREOL) has developed a technique for creating the world first full-color,
flexible thin-film reflective display. Chanda research was inspired by nature. Traditional displays like those on a mobile phone require a light source, filters and a glass plates.
But animals like chameleons, octopuses and squids are born with thin flexible, color-changing displays that don need a light source their skin. ll manmade displays LCD, LED,
CRT are rigid, brittle and bulky. But you look at an octopus, they can create color on the skin itself covering a complex body contour,
and it stretchable and flexible, Chanda said. hat was the motivation: Can we take some inspiration from biology
and create a skin-like display? As detailed in the cover article of the June issue of the journal Nature Communications,
Chanda is able to change the color on an ultrathin nanostructured surface by applying voltage.
The new method doesn need its own light source. Rather, it reflects the ambient light around it. A thin liquid crystal layer is sandwiched over a metallic nanostructure shaped like a microscopic egg carton that absorbs some light wavelengths
and reflects others. The colors reflected can be controlled by the voltage applied to the liquid crystal layer.
The interaction between liquid crystal molecules and plasmon waves on the nanostructured metallic surface played the key role in generating the polarization-independent
full-color tunable display. His method is groundbreaking. It a leap ahead of previous research that could produce only a limited color palette.
And the display is only about few microns thick, compared to a 100-micron-thick human hair.
Such an ultrathin display can be applied to flexible materials like plastics and synthetic fabrics. The research has major implications for existing electronics like televisions,
computers and mobile devices that have considered displays thin by today standards but monstrously bulky in comparison.
But the potentially bigger impact could be whole new categories of displays that have never been thought of. our camouflage
your clothing, your fashion items all of that could change, Chanda said. hy would I need 50 shirts in my closet
if I could change the color and pattern? Researchers used a simple and inexpensive nano-imprinting technique that can produce the reflective nanostructured surface over a large area. his is a cheap way of making displays on a flexible substrate with full-color generation,
Chanda said. hat a unique combination. The research team included lead author Daniel Franklin and Yuan Chen, Abraham Vazquez-Guardado, Sushrut Modak, Javeneh Boroumand, Daming Xu and Shin-Tson
Wu, all of UCF. Chanda research was funded by the university and grants from the Florida Space Institute/NASA.
He was awarded just a $300, 000 grant from the National Science Foundation to continue his research c
#Breakthrough graphene production could trigger revolution in artificial skin development A pioneering new technique could pave the way for the development of the first truly flexible lectronic skin Abstract:
A pioneering new technique to produce high-quality, low cost graphene could pave the way for the development of the first truly flexible'electronic skin,
'that could be used in robots. Researchers from the University of Exeter have discovered an innovative new method to produce the wonder material Graphene significantly cheaper,
and easier, than previously possible. The research team, led by Professor Monica Craciun, have used this new technique to create the first transparent and flexible touch-sensor that could enable the development of artificial skin for use in robot manufacturing.
Professor Craciun, from Exeter's Engineering department believes the new discovery could pave the way for"a graphene-driven industrial revolution"to take place.
She said:""The vision for a'graphene-driven industrial revolution'is motivating intensive research on the synthesis of high quality and low cost graphene.
Currently, industrial graphene is produced using a technique called Chemical Vapour Deposition (CVD. Although there have been significant advances in recent years in this technique,
it is still an expensive and time consuming process.""The Exeter researchers have discovered now a new technique,
which grows graphene in an industrial cold wall CVD system, a state-of-the-art piece of equipment recently developed by UK graphene company Moorfield.
This so-called nanocvd system is based on a concept already used for other manufacturing purposes in the semiconductor industry.
This shows to the semiconductor industry for the very first time a way to potentially mass produce graphene with present facilities rather than requiring them to build new manufacturing plants.
This new technique grows graphene 100 times faster than conventional methods, reduces costs by 99
"Professor Seigo Tarucha from the University of Tokyo, coordinator of the Global Center of Excellence for Physics at Tokyo university and director of the Quantum Functional System Research Group at Riken Center
After starting the collaboration with Professor Craciun's group, we are using Exeter CVD grown graphene instead of the exfoliated material in our graphene-based devices, whenever possible."
"The research team used this new technique to create the first graphene-based transparent and flexible touch sensor.
The team believes that the sensors can be used not just to create more flexible electronics,
but also a truly-flexible electronic skin that could be used to revolutionise robots of the future. Dr Thomas Bointon, from Moorfield Nanotechnology and former Phd student in Professor Craciun's team at Exeter added:"
"Emerging flexible and wearable technologies such as healthcare electronics and energy harvesting devices could be transformed by the unique properties of graphene.
The extremely cost efficient procedure that we have developed for preparing graphene is of vital importance for the quick industrial exploitation of graphene."
"At just one atom thick, graphene is the thinnest substance capable of conducting electricity. It is very flexible
and is one of the strongest known materials. The race has been on for scientists and engineers to adapt graphene for flexible electronics.
Professor Saverio Russo, co-author and also from the University of Exeter, added:""This breakthrough will nurture the birth of new generations of flexible electronics and offers exciting new opportunities for the realization of graphene-based disruptive technologies."
"In 2012 the teams of Prof Craciun and Profesor Russo, from the University of Exeter's Centre for Graphene science, discovered that sandwiched molecules of ferric chloride between two graphene layers make a whole new system that is the best known
transparent material able to conduct electricity. The same team have discovered recently that Graphexeter is also more stable than many transparent conductors commonly used by, for example, the display industry.
About University of Exeter The University of Exeter is a Russell Group university that combines world-class research with very high levels of student satisfaction.
Exeter has over 19 000 students and is ranked 7th in The Times and The Sunday Times Good University Guide league table, 10th in The Complete University Guide and 9th in the Guardian University Guide 2015.
In the 2014 Research Excellence Framework (REF), the University ranked 16th nationally, with 98%of its research rated as being of international quality.
Exeter was The Sunday Times University of the Year 2012-13. The University has invested strategically to deliver more than £350 million worth of new facilities across its campuses in the last few years;
including landmark new student services centres-the Forum in Exeter and The Exchange on the Penryn Campus in Cornwall, together with world-class new facilities for Biosciences, the Business school and the Environment and Sustainability Institute.
There are plans for further investment between now and 2016 d
#New conductive ink for electronic apparel Abstract: University of Tokyo researchers have developed a new ink that can be printed on textiles in a single step to form highly conductive and stretchable connections.
This new functional ink will enable electronic apparel such as sportswear and underwear incorporating sensing devices for measuring a range of biological indicators such as heart rate and muscle contraction.
Current printed electronics, such as transistors, light emitted diodes and solar panels, can be printed on plastic or paper substrates,
but these substrates tend to be rigid or hard. The use of soft, stretchable material would enable a new generation of wearable devices that fit themselves to the human body.
However it has proved difficult to make an ink that is both highly conductive and elastic without a complicated multi-step printing process.
Now, Professor Takao Someya's research group at the University of Tokyo's Graduate school of Engineering has developed an elastic conducting ink that is easily printed on textiles and patterned in a single printing step.
This ink is comprised of silver flakes, organic solvent, fluorine rubber and fluorine surfactant. The ink exhibited high conductivity even
when it was stretched to more than three times its original length, which marks the highest value reported for stretchable conductors that can be extended to more than two and a half times their original length.
Using this new ink the group created a wrist-band muscle activity sensor by printing an elastic conductor on a sportswear material and combining it with an organic transistor amplifier circuit.
This sensor can measure muscle activity by detecting muscle electrical potentials over an area of 4x4 square centimeters with nine electrodes placed 2 centimeters apart in a 3x3 grid."
"Our team aims to develop comfortable wearable devices. This ink was developed as part of this endeavor, "says Someya."
"The biggest challenge was obtaining high conductivity and stretchability with a simple one-step printing process. We were able to achieve this by use of a surfactant that allowed the silver flakes to self-assemble at the surface of the printed pattern,
ensuring high conductivity.""Collaborating institutions The Institute of Scientific and Industrial Research (ISIR), Osaka Universit t
#Green Chemistry Methods Used in Iran to Produce Zinc oxide nanoparticles Iranian researchers used a new method based on green chemistry to synthesize zinc oxide nanoparticles.
This method is based on the standards of green chemistry due to the use of biological and green reactants instead of toxic chemicals and contaminants.
In addition, carrying out the synthesis at ambient temperature and pressure significantly decreases costs, increases speed and reduces the environmental pollution in comparison with the normal chemical methods.
In this research, biocompatible nanoparticles based on zinc oxide were synthesized through green chemistry standards. Carrying out all reactions in the green solvent of water
use of biological reactant and elimination of toxic and polluting materials and solvents are among the most important advantages of the proposed method.
Among the other achievements of the research, mention can be made of the use of available and cheap raw materials, low temperature, simplicity and repeatability of the production method.
Another point is that various industries can reduce their costs by using this method in long-term periods through reducing the pollution and less consumption of energy.
The industrial and usual application of zinc oxide nanoparticles is in rubber industry due to its isolation against electricity
The use of zinc oxide nanoparticles in rubber leads to the smooth appearance of the rubber, increases its durability, maintains its strength at high temperature and increases the life of the rubber.
In addition, zinc oxide nanoparticles can have new applications in optoelectronics, sensors, transformators, and medical industries due to their properties, including semi-conductivity,
being piezoelectric and pyroelectric and biocompatibility. Results of the research have been published in Ceramics International, vol. 41, issue 7, 2015, pp. 8382-8387 7
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