"On a fundamental level, our work demonstrates electron-beam based manipulation of nanoparticles an order of magnitude larger than previously possible,
If these molecules are close to nanoparticles, the plasmons in the nanoparticles enhance the Raman signal coming from the molecules that have to be detected with several orders of magnitude.
The nanoantennas developed in this project only enhance the emitted Raman signal if the biomolecules are close to the hot spots Therefore,
'maskless'approach to producing nanoholes using silver nanoparticles. First, they deposited a nanometer-thin layer of silver onto a silicon wafer
The catalysts, tungsten-based bimetallic alloy nanoparticles of non-cubic symmetry, have high melting points and consequently are able to maintain their crystal structure during the chemical vapor deposition (CVD) process,
and the arrangement of the atoms in one of the planes of the nanocrystal catalyst facilitates the (n,
"Employing tungsten-based alloy nanocrystals with unique structure as catalysts paves a way for the ultimate chirality control in SWNT growth.
or emboss the raised numerals on credit cardsould process nanoparticles more subtly than the most advanced chemistry.
when applied to nanoparticle arrays, forms new nanostructures with tunable properties.""There is a great potential market for this technology,
platinum and other metallic nanoparticles Clem said the researchers are now starting to work with semiconductors.
A coating of nanoparticles that can build into another structure has a certain functionality we don't have right now.
For example, under pressure, the dimensions of ordered three-dimensional nanoparticle arrays shrink. By fabricating a structure in
the nanoparticle array will remain at a constant state, able to transmit light and electricity with specific characteristics.
At even higher pressures, nanoparticles are forced to sinter, or bond, forming new classes of chemically
composition and phase orientation of the initial nanoparticle arrays, a variety of nanostructures or nanocomposites and 3-D interconnected networks are achievable.
and Complexity have succeeded in developing a new technology that introduces metal nanoparticles on the surface of polymer nanocapsules made of cucurbit 6 uril.
and metal salts can serve as a versatile platform where equal sized metal nanoparticles can be distributed evenly on the surface of the polymer nanocapsules.
which can stabilize metal nanoparticles by preventing them from clustering together. The metal nanoparticle-decorated polymer nanocapsules exhibit the following properties in water:
high stability for up to 6 months; high dispersibility; excellent catalytic activity; and reusability in carbon-carbon and carbon-nitrogen bond-forming reactions with 100%conversion efficiency.
Even though metal nanoparticles are used variously in industrial, pharmaceutical and agricultural (fertilizer) applications as a catalyst, toxic liquids such as toluene and hexane are used usually as solvents in the carbon-carbon
However, this new technology is able to replace those toxic liquids as it allows carbon-carbon and carbon-nitrogen bond-formation with the use of metal nanoparticles as a catalyst
and reusability in water, which other existing metal nanoparticles on solid supports have not been able to do,
#Scientists develop a'nanosubmarine'that delivers complementary molecules inside cells With the continuing need for very small devices in therapeutic applications there is a growing demand for the development of nanoparticles that can transport
Recently researchers created nanoparticles that under the right conditions self-assemble trapping complementary guest molecules within their structure.
Although the transport of molecules inside cells with nanoparticles has been achieved previously using various methods researchers have developed nanoparticles capable of delivering
if the nanoparticles can actually travel through the bloodstream. That would be the dream but we have no evidence that they can actually do so Raymo says.
The size of these nanoparticles their dynamic character and the fact that the reactions take place under normal biological conditions (at ambient temperature
and neutral environment) makes these nanoparticles an ideal vehicle for the controlled activation of therapeutics directly inside the cells Raymo says.
Research and applications of iron oxide nanoparticles More information: Bacterial Nanometric Amorphous Fe-Based Oxide: A Potential Lithium-Ion Battery Anode Material.
#Nanoparticles could provide easier route for cell therapy UT Arlington physics researchers may have developed a way to use laser technology to deliver drug and gene therapy at the cellular level without damaging surrounding tissue.
the team paired crystalline magnetic carbon nanoparticles and continuous wave near-infrared laser beams for in
and Mohanty used a 50 to 100 milliwatt laser and the same carbon nanoparticle, which absorbs the beam,
continuous wave near-infrared laser and the nanoparticle to permeate the cell membrane without killing the cells.
whose lab created the study's crystalline magnetic carbon nanoparticle using an electric plasma discharge inside a toulene solution.
A significant advantage of the new method is that the near-infrared light absorption of the nanoparticle can be used to selectively amplify interaction of low power laser with targeted tissue
The magnetic properties of the nanoparticles also mean they can be localized with an external magnetic field;
"Carbon nanoparticles produced for the cancer study varied from five to 20 nanometers wide. A human hair is about 100,000 nanometers wide.
The magnetic carbon nanoparticles also are fluorescent. So, they can be used to enhance contrast of optical imaging of tumors along with that of MRI I
They observed the metal atoms becoming charged ions, clustering with up to thousands of others into metal nanoparticles,
#New approach may be key to quantum dot solar cells with real gains in efficiency (Phys. org) Los alamos researchers have demonstrated an almost fourfold boost of the carrier multiplication yield with nanoengineered quantum dots.
#DNA-linked nanoparticles form switchable'thin films'on a liquid surface Scientists seeking ways to engineer the assembly of tiny particles measuring just billionths of a meter have achieved a new firsthe
formation of a single layer of nanoparticles on a liquid surface where the properties of the layer can be switched easily.
In addition, because the scientists used tiny synthetic strands of DNA to hold the nanoparticles together
the study also offers insight into the mechanism of interactions of nanoparticles and DNA molecules near a lipid membrane.
This understanding could inform the emerging use of nanoparticles as vehicles for delivering genes across cellular membranes."
"Our work reveals how DNA-coated nanoparticles interact and reorganize at a lipid interface, and how that process affects the properties of a"thin film"made of DNA-linked nanoparticles,
"said physicist Oleg Gang who led the study at the Center for Functional Nanomaterials (CFN) at the U s. Department of energy's Brookhaven National Laboratory.
the synthetic DNA strands used as"glue"to bind nanoparticles in this study have a natural tendency to pair up
Scientists at Brookhaven have made great use of the specificity of this attractive force to get nanoparticles coated with single synthetic DNA strands to pair up
"Many of the applications we envision for nanoparticles, such as optical coatings and photovoltaic and magnetic storage devices, require planar geometry,
Other groups of scientists have assembled such planes of nanoparticles, essentially floating them on a liquid surface,
"Using DNA linker molecules gives us a way to control the interactions between the nanoparticles."
a lipid, has a strong positive charge it attracts the negatively charged DNA strands that coat the nanoparticles.
That electrostatic attraction and the repulsion between the negatively charged DNA molecules surrounding adjacent nanoparticles overpower the attractive force between COMPLEMENTARY DNA bases.
and link the nanoparticles together more closely, first forming string-like arrays, and with more salt, a more solid yet elastic mesh-like layer."
As part of the study, the scientists examined the different configurations of the nanoparticles on top of the liquid layer using x-ray scattering at Brookhaven's National Synchrotron Light source (NSLS.
Because of the nanoscale size-regime, we might envision using such membranes for filtering proteins or other nanoparticles,
Understanding how synthetic DNA-coated nanoparticles interact with a lipid surface may also offer insight into how such particles coated with actual genes might interact with cell membraneshich are composed largely of lipidsnd with one another in a lipid environment."
"Other groups have considered using DNA-coated nanoparticles to detect genes within cells, or even for delivering genes to cells for gene therapy
I believe this approach has significant value as a platform for more detailed investigations of realistic systems important for these new biomedical applications of DNA NANOPARTICLE pairings,
#Technology using microwave heating may impact electronics manufacture Engineers at Oregon State university have shown successfully that a continuous flow reactor can produce high-quality nanoparticles by using microwave-assisted heating essentially the same forces
are essentially a"proof of concept"that a new type of nanoparticle production system should actually work at a commercial level."
"Nanoparticles are extraordinarily small particles at the forefront of advances in many biomedical, optical and electronic fields,
researchers worked with lead selenide nanoparticles, which are particularly good for the taggant technologies. Other materials can be synthesized using this reactor for different applications,
Shoei Electronic Materials, one of the collaborators, is pursuing"quantum dot"systems based on this approach, and recently opened new manufacturing facilities in Eugene, Ore.,
to use this synthetic approach for quantum dot enabled televisions, smartphones and other devices d
#Antimicrobial coatings with a long-term effect for surfaces Researchers at the INM Leibniz Institute for New Materials have produced now antimicrobial abrasion-resistant coatings with both silver
#New class of nanoparticle brings cheaper lighter solar cells outdoors Think those flat glassy solar panels on your neighbour's roof are the pinnacle of solar technology?
and tested a new class of solar-sensitive nanoparticle that outshines the current state of the art employing this new class of technology.
This new form of solid stable light-sensitive nanoparticles called colloidal quantum dots could lead to cheaper and more flexible solar cells as well as better gas sensors infrared lasers infrared light emitting diodes and more.
and demonstrated a new colloidal quantum dot n-type material that does not bind oxygen when exposed to air.
But improved performance is just a start for this new quantum dot-based solar cell architecture. The powerful little dots could be mixed into inks
The field of colloidal quantum dot photovoltaics requires continued improvement in absolute performance or power conversion efficiency said Sargent.
Quantum dot photovoltaics set new record for efficiency in such devices More information: Air-stable n-type colloidal quantum dot solids DOI:
10.1038/nmat400 a
#Shatterproof screens that save smartphones University of Akron polymer scientists have developed a transparent electrode that could change the face of smartphones, literally,
As the team describes in their paper published in the journal Scientific Reports the new system is based on adding certain types of nanoparticles to materials as part of the manufacturing process that can be read later using a special device.
The idea revolves around several types of metal nanoparticles each of which has a unique melting point. Mixing the nanoparticles together allows for creating unique thermal signatures.
To use the nanoparticles manufacturers would simply add them into the mix when creating metals papers and even fluids.
The researchers say the addition of the nanoparticles doesn't change how a material looks doesn't react with anything in it
or impact how a finished product performs. Reading the new type of bar code requires a device capable of performing differential scanning calorimetry (DSC) a technique based on assessing the difference in the amount of heat required to heat different parts of a sample material.
For criminals to circumvent the process they would have to somehow find out which nanomaterials were added to a product to create its unique thermal signature then add the right mix of nanoparticles to their own counterfeit product to recreate it no easy feat.
The researchers claim their nanoparticle bar codes could be used with paper metals fluids and even drugs.
Taox-capped Pt nanoparticles as efficient catalysts for polymer electrolyte fuel cells More information: Covert thermal barcodes based on phase change nanoparticles Scientific Reports 4 Article number:
5170 DOI: 10.1038/srep05170abstractan unmet need is to develop covert barcodes that can be used to track-trace objects
This paper describes a new nanoparticle-based covert barcode system in which a selected panel of solid-to-liquid phase change nanoparticles with discrete and sharp melting peaks is added in a variety of objects such as
This method has high labeling capacity owing to the small sizes of nanoparticles sharp melting peaks
which organises metal nanoparticles into alternating layers in thin gel films to produce the sensors in a matter of seconds.
it is added then to a pink solution of gold nanoparticles. If any of the three genetic variations is present
Quantum dot photovoltaics set new record for efficiency in such devices Solar-cell technology has advanced rapidly as hundreds of groups around the world pursue more than two dozen approaches using different materials technologies
Now a team at MIT has set a new record for the most efficient quantum dot cells a type of solar cell that is seen as especially promising because of its inherently low cost versatility and light weight.
The new work brings together developments from several fields to push the technology to unprecedented efficiency for a quantum dot based system:
Arthur Nozik a research professor in chemistry at the University of Colorado who was involved not in this research says This result represents a significant advance for the applications of quantum dot films and the technology of low-temperature solution-processed quantum dot photovoltaic cells.#
#There is still a long way to go before quantum dot solar cells are commercially viable but this latest development is a nice step toward this ultimate goal.
Received 06 december 2013 Accepted 15 april 2014 Published online 25 may 2014energy Level Modification in Lead Sulfide Quantum dot Thin Films Through Ligand Exchange.
#Nanoparticles on track to distinguish tumour tissue Gold nanoparticles could be used to help detect the margins between tumours and normal tissue,
whether the nanoparticles would work as effective optical contrast agents to provide an estimate of the size and shape of tumour margins during surgery.
"Most research has been done with straight gold nanoparticles as contrast agents but the problem with them is they absorb light very strongly.
"Silica-gold nanoparticles provide greater contrast, visibility To get around this, Mr Duczynski used silica nanoparticles coated with a gold shell (silica-gold core-shell nanoparticles) in his research."
"There are some theoretical and experimental papers where it was observed that by varying the dimensions of either the silica core
"Ultraviolet spectroscopy was used on the silica-gold core-shell nanoparticles made by Mr Duczynski to better understand their optical properties, such as extinction, scattering and absorption.
The research also involved the development of iron oxide-gold core shell nanoparticles.""This particle system was attempted because
"I was able to see some scattering of the iron oxide-gold core-shell nanoparticles,
Recently biomedical researchers have found ways to increase the effectiveness of certain contrast agents by associating them with nanoparticles.
Researchers are now exploring the multipurpose use of nanoparticles. If particles could be loaded with several types of contrast agents
though compounds packaged together into a nanoparticle cannot always play well together. For example contrast agents may bind to other chemicals reducing their effectiveness.
In addition when contrast agents are enclosed inside a nanoparticle they may not work as well. Attempts to attach agents to the outer surface of nanoparticles via covalent formation are also problematic as they can negatively affect the activity of the nanoparticles or the compounds that they carry.
Kong Smith and colleagues tackled these challenges by using interactions between naturally occurring biomolecules as a guide.
The group hypothesized that the same types of forces could be used to attach a contrast agent to the surface of a type of nanoparticle called a liposome
Gadolinium stably associated with the modified nanoparticles in solution and experiments in animal models showed that these nanoparticles produced clear diagnostic images.
The strategy works like Velcro on a molecular level to adhere functional units to the outer leaflet of a liposome said Smith who was first author on the study.
10.1021/la500412r) Kong and Smith developed a process for chemically cross-linking the components of the nanoparticle that prolonged the life of the nanoparticles in biological conditions.
Nanoparticle pinpoints blood vessel plaque e
#Liberating devices from their power cords: New structural'supercaps'take a lickin'keep on workin'Imagine a future in which our electrical gadgets are limited no longer by plugs and external power sources.
Gold nanoparticles lie on the surface of the chip and are programed chemically with an antibody receptor in such a way that they are capable of specifically attracting the protein markers circulating in blood.
and if cancer markers are present in the blood they will stick to the nanoparticles located on the micro-channels as they pass by setting off changes in
"When researching nanoparticles, you normally use samples. For us, we set the challenge to coat 2 meters long stainless steel tubes,
#Researchers find definitive evidence of how zeolites grow Researchers have found the first definitive evidence of how silicalite-1 (MFI type) zeolites grow showing that growth is concerted a process involving both the attachment of nanoparticles and the addition of molecules.
For more than two decades researchers have theorized that nanoparticles which are known to be present in zeolite growth solutions played a role in the growth
or molecules to the crystal the presence and gradual consumption of nanoparticles suggested a nonclassical pathway for zeolite crystallization.
The device which is designed to be used outside the body much like dialysis uses nanoparticles to trap pore-forming toxins that can damage cellular membranes
Nanoparticles have already been shown to be effective at neutralizing pore-forming toxins in the blood
but if those nanoparticles cannot be digested effectively they can accumulate in the liver creating a risk of secondary poisoning especially among patients who are already at risk of liver failure.
To solve this problem a research team led by nanoengineering professor Shaochen Chen created a 3-D-printed hydrogel matrix to house nanoparticles forming a device that mimics the function of the liver by sensing attracting
The concept of using 3-D printing to encapsulate functional nanoparticles in a biocompatible hydrogel is said novel Chen.
#The scientists used a light-sensitive biocompatible epoxy resin in which they incorporated magnetic nanoparticles. In the first part of the curing stage they exposed a thin layer of this material to a magnetic field.
This field magnetised the nanoparticles leading to a particle re-arrangement in form of parallel lines.
potentially offering an easy way to monitor the assembly of nanoparticles, or to study how mass is distributed within a cell.
and morphology of the alloy nanoparticles on surfaces,"said Dr. Grant Johnson, a PNNL physical chemist who led the study.
The team created the nanoparticles using magnetron sputtering and gas aggregation. They placed them on a surface using ion soft landing techniques devised at PNNL.
The result is a layer of bare nanoparticles made from two different metals that is free of capping layers, residual reactants,
The result is bare ionic metal nanoparticles that are about 4 to 10 nanometers across. The mass spectrometer filters the ionic particles,
rather than homogeneous nanoparticles with the desired shape. Further, the particles lack a capping layer.
At relatively short time frames on flat surfaces, the nanoparticles bind randomly. Leave the process running longer and a continuous film forms.
Stepped surfaces result in the nanoparticles forming linear chains on the step edges at low coverage.
While this work focuses on single nanoparticles, the final result is extended an array with implications that stretch from the atomic scale to the mesoscale."
"Soft Landing of Bare Nanoparticles with Controlled Size, Composition, and Morphology.""Nanoscale 7: 3491-3503.
form new nanocrystals that are attached loosely to the seed surface. Fluids, used in the process, shear the weakly tethered new crystals from the seed crystal surface allowing the surfaces to be further available for a repeat process
creating an electrode made of nanoparticles with a solid shell, and a olkinside that can change size again and again without affecting the shell.
The use of nanoparticles with an aluminum yolk and a titanium dioxide shell has proven to be he high-rate champion among high-capacity anodes
That where the idea of using confined aluminum in the form of a yolk-shell nanoparticle came in.
That alliance also has led to important advances in the use of quantum dot materials to create highly efficient solar cells and sodium batteries,
#Bioadhesive Nanoparticles Help Protect Your Skin From the Sun Dermatologists from Yale university have developed a new sunscreen made with bioadhesive nanoparticles that doesn penetrate the skin,
made with bioadhesive nanoparticles, that stays on the surface of the skin. Results of the research will appear in the September 28 online edition of the journal Nature Materials. e found that
and our nanoparticles are so adhesive that they don even go into hair follicles, which are relatively open.
the researchers developed a nanoparticle with a surface coating rich in aldehyde groups, which stick tenaciously to the outer skin layer.
The nanoparticle hydrophilic layer essentially locks in the active ingredient, a hydrophobic chemical called padimate O. Some sunscreen solutions that use larger particles of inorganic compounds, such as titanium dioxide or zinc oxide,
By using a nanoparticle to encase padimate O, an organic chemical used in many commercial sunscreens,
#Peering Into Nanoparticles One at a time Reveals Hidden World Imagine you could single out individuals in a large group
This is essentially what researchers at Chalmers University in Sweden have been able to achieve with a new microscopy technique that is capable of looking at a single nanoparticle rather than just a mass of them all clumped together. e were able to show that you gain deeper insights into the physics
of how nanomaterials interact with molecules in their environment by looking at the individual nanoparticle as opposed to looking at many of them at the same time,
The researchers applied the experimental spectroscopy technique to examine hydrogen absorption in single palladium nanoparticles.
despite various nanoparticles having the same size and shape, they would absorb hydrogen at pressures as different as 40 millibars.
While others have been able to image single nanoparticles previously, those efforts came at a rather high cost of heating the nanoparticles up,
or impacting them in some other way that eliminates the ability to observe them accurately. hen studying individual nanoparticles you have to send some kind of probe to ask the particle hat are you doing?
said Langhammer. his usually means focusing a beam of high-energy electrons or photons or a mechanical probe onto a very tiny volume.
so that it is possible to study nanoparticles one at a time in their actual environments. This ability to observe nanoparticles outside the lab could prove to be a key development for studies on the impact of nanoparticles in the environment e
#An Electric car Heater Can't Be Too Thin or Too Economical Just about every electrical device seems to want to slim down to a thin filmf possible,
The nanoengineering team was then able to modify the microfish body with various nanoparticles, using platinum in the tail section to interact with the hydrogen peroxide used to propel the fish forward,
Chen and Wang have conducted demonstrations to show the great potential of combining 3d printing with nanoengineering, installing polydiacetylene (PDA) nanoparticles within the microfish.
when nanoparticles are introduced to the particular toxins. This project offers boundless potential for the way that we locate
nanoparticles and biocompatible matrices for biotechnological applications. Moreover, they are pioneers in the application of silica-based ordered mesoporous materials,
#Microbubble Technology for Delivery of Nanoparticles to Tumours Biomedical researchers led by Dr. Gang Zheng at Princess Margaret Cancer Centre have converted successfully microbubble technology already used in diagnostic imaging into nanoparticles that stay
and observed that they fragmented into nanoparticles. Most importantly the nanoparticles stayed within the tumour and could be tracked using imaging."
"Our work provides the first evidence that the microbubble reforms into nanoparticles after bursting and that it also retains its intrinsic imaging properties.
We have identified a new mechanism for the delivery of nanoparticles to tumours, potentially overcoming one of the biggest translational challenges of cancer nanotechnology.
In addition, we have demonstrated that imaging can be used to validate and track the delivery mechanism, "says Dr. Zheng, Senior Scientist at the Princess Margaret and also Professor of Medical Biophysics at the University of Toronto.
"So for clinicians, harnessing microbubble to nanoparticle conversion may be a powerful new tool that enhances drug delivery to tumours,
organic nanoparticle delivery platforms capable of transporting cancer therapeutics directly to tumours. Source: http://www. uhn. ca a
#Electroluminescence with Phosphor Nanoparticles Holds Promise for Modern Lighting Light-emitting diodes (LEDS) are the modern lighting devices used in lamps, signals, signs or displays.
Special nanoparticles, so-called phosphors, are excited in an electric field to emit light. Researchers at the INM Leibniz Institute for New Materials have developed now a new method that enables electroluminescence on large
On application of an AC voltage, light is emitted from the electroluminescent layer. e embed luminous particles in the form of functionalized zinc sulphide nanoparticles as phosphors into the binder layer,
The researchers are currently working on further functionalization of the phosphor nanoparticles. ur goal is to generate white light by means of an altered doping
"Spatially strictly limited silicon nanoparticles display fundamentally different properties to conventional silicon wafers, "explains Matthias Wagner.
thus opens up the possibility of studying the fundamental electronic properties of cage-like Si nanoparticles compared to crystalline semiconductor silicon.
Solid electrolyte Interphase Formation and Preferential Growth of Lithium Metal Nanoclusters. Coauthors are Robert Sacci, Jennifer Black, Nina Balke, Nancy Dudney, Karren More and Raymond Unocic.
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