nanoparticle

Nanoparticle

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The gold found in plants are nanoparticles so there may be great potential for the chemical industry which uses gold nanoparticles as catalysts for chemical reactions Anderson said.

The researchers fabricated their samples from round nanoparticles of boron nitride in which the atoms of nitrogen and boron form an onionlike structure of nested layers.

the nanoparticles coalesced into tiny grains comprising numerous twin domains. The onionlike precursors, Tian explains,

and bovine cells in the shape of an ear incorporating silver nanoparticles to form a coiled antenna.

or even aluminum nanoparticles that when triggered by a laser or other outside energy ripple like waves in a pond.

Strong waves can trigger plasmon responses in adjacent nanoparticles. They are being investigated at Rice and elsewhere for use in sophisticated electronic and medical applications.

Because aluminum as nanoparticles or nanostructures displays optical resonances across a much broader region of the spectrum than

One paper by the labs of Rice scientists Naomi Halas and Peter Nordlander Aluminum for Plasmonics demonstrates that the color of aluminum nanoparticles depends not only on their size and shape but also critically on their oxide content.

They have shown that in fact the color of an aluminum nanoparticle provides direct evidence of the amount of oxidation of the aluminum material itself.

Manufacturing pure aluminum nanoparticles has been a roadblock in their development for plasmonics but the Halas lab created a range of disk-shaped particles from 70 to 180 nanometers in diameter to test their properties.

when in the form of a nanomatryushka multilayer nanoparticles named for the famous Russian nesting dolls.

and lead author Vikram Kulkarni a Rice graduate student found electrons gained the capability to tunnel from one layer to another in the nanoparticle.

The calculations should be of great interest to those who use nanoparticles as probes in Raman spectroscopy where quantum tunneling between particles can dampen electric fields

#Toxic nanoparticles might be entering human food supplyover the last few years the use of nanomaterials for water treatment food packaging pesticides cosmetics

For example farmers have used silver nanoparticles as a pesticide because of their capability to suppress the growth of harmful organisms.

In a new study researchers at the University of Missouri have developed a reliable method for detecting silver nanoparticles in fresh produce and other food products.

because we do not know the toxicity of the nanoparticles. Our goal is to detect identify

and quantify these nanoparticles in food and food products and study their toxicity as soon as possible. Lin and his colleagues including MU scientists Azlin Mustapha

and Bongkosh Vardhanabhuti studied the residue and penetration of silver nanoparticles on pear skin. First the scientists immersed the pears in a silver nanoparticle solution similar to pesticide application.

The pears were washed then and rinsed repeatedly. Results showed that four days after the treatment

and rinsing silver nanoparticles were attached still to the skin and the smaller particles were able to penetrate the skin

The penetration of silver nanoparticles is dangerous to consumers because they have the ability to relocate in the human body after digestion Lin said.

Therefore smaller nanoparticles may be more harmful to consumers than larger counterparts. When ingested nanoparticles pass into the blood

and lymph system circulate through the body and reach potentially sensitive sites such as the spleen brain liver and heart.

The growing trend to use other types of nanoparticles has revolutionized the food industry by enhancing flavors improving supplement delivery keeping food fresh longer

However researchers worry that the use of silver nanoparticles could harm the human body. This study provides a promising approach for detecting the contamination of silver nanoparticles in food crops

or other agricultural products Lin said. Members of Lin's research team also included Zhong Zang a food science graduate student.

Solar steam's efficiency comes from light-harvesting nanoparticles that were created at LANP by Rice graduate student Oara Neumann the lead author on the PNAS study.

but also help deliver lithium ions to the nanoparticles. Lab tests showed initial charge capacities of more than 1520 milliamp hours per gram (mah/g). Over repeated charge-discharge cycles the material settled into a solid 825 mah/g. It took about two months to go through 50

Graphene nanoribbons make a terrific framework that keeps the tin oxide nanoparticles dispersed and keeps them from fragmenting during cycling he said.

and permitted to remain that way by being dispersed on GNR surfaces the volume changes in the nanoparticles are not dramatic.

Lin said the lab plans to build batteries with other metallic nanoparticles to test their cycling and storage capacities.

University of Louisville researchers have uncovered how to create nanoparticles using natural lipids derived from grapefruit

These nanoparticles which we've named grapefruit-derived nanovectors (GNVS) are derived from an edible plant

and are much cheaper to produce at large scale than nanoparticles made from synthetic materials Zhang said.

The therapeutic potential of grapefruit derived nanoparticles was validated further through a Phase 1 clinical trial for treatment of colon cancer patients.

So far researchers have observed no toxicity in the patients who orally took the anti-inflammatory agent curcumin encapsulated in grapefruit nanoparticles.

It made sense for us to consider eatable plants as a mechanism to create medical nanoparticles as a potential nontoxic therapeutic delivery vehicle.

In addition to grapefruit Zhang and his team analyzed the nanoparticles from tomatoes and grapes. Grapefruits were chosen for further exploration

The key enzymes immobilized on the magnetic nanoparticles can easily be recycled using a magnetic force. Zhang designed the experiments

Unlike some products of the revolution in nanomaterials and nanotechnology nanogumbos can be designed for specific uses rather than simply adapted for a particular use after being synthesized in the lab. Warner pointed out for instance that scientists are working on various types of nanoparticles for use in nanomedicine especially to diagnose

In diagnosing cancer nanoparticles with cancer-seeking properties might be injected into a patient before a medical scan.

For treating the disease nanoparticles would preferentially collect in and destroy only the abnormal cells sparing healthy tissue from the damage that triggers side effects with existing cancer chemotherapy.

Warner said that nanogumbos technology allows scientists to produce new nanoparticles in a focused way such that these particles are produced for specific uses from the beginning.

However many nanoparticles developed so far for medical use for instance must be coated with other materials to provide the desired medicinal property.

With GUMBOS technology nanoparticles can have desired the property incorporated directly into the nanomaterial he explained.

For example some nanoparticles are used as the drug delivery vehicle. We can make nanogumbos that are both the drug

Therefore it is important to understand how engineered nanoparticles interact with microorganisms which form the basis of all known ecosystems

#X-rays reveal uptake of nanoparticles by soybean cropsmetals contained in nanoparticles can enter into the food chain.

Scientists have traced for the first time the nanoparticles taken up from the soil by crop plants and analysed the chemical states of their metallic elements.

The results contribute to the controversial debate on plant toxicity of nanoparticles and whether engineered nanoparticles can enter into the food chain.

The study was published on 6 february 2013 in the journal ACS Nano. The international research team was led by Jorge Gardea-Torresdey from the University of Texas in El paso

Nanoparticles are present everywhere for example in the fine dust of wood fires. Even a simple chemical compound behaves differently as a nanoparticle mostly due to the increased specific surface area and reactivity.

These appealing properties Are engineered why so-called Nanoparticles (ENPS) are used now widely in industrial processing and consumer goods.

At the same time their high reactivity has raised concerns about their fate transport and toxicity in the environment.

This is why it is very important to study the interactions of crops with nanoparticles as their possible translocation into the food chain starts here. says Jorge Gardea-Torresdey a Professor

which the plants were grown was mixed with zinc oxide (Zno) and cerium dioxide (Ceo2 nanoceria) nanoparticles which are among the most highly used in industry.

i e. whether they were still bound to nanoparticles or had dissolved and bound with plant tissue. We used X-ray beams 1000 times thinner than a human hair and the way in

and whether they formed part of a nanoparticle in the plant or not. says Hiram Castillo a scientist at the ESRF in Grenoble.

and pods was in the same chemical state as in the nanoparticles. However part of the cerium had changed its oxidation state from Ce (IV) to Ce (III) which can alter the chemical reactivity of the nanoparticles.

Zinc was detected in nodules stems and pods in concentrations higher than in a control group of plants.

The spectral analysis did not show the presence of zinc in the plants bound as Zno nanoparticles which means that the zinc in the nanoparticles had been biotransformed.

As zinc is present in most plants it didn't come as a surprise that zinc from the nanoparticles in the soil can enter into the plant tissue.

which when used in nanoparticles might pose a real threat. says Hiram Castillo. Our results have shown also that Ceo2 nanoparticles can be taken up by food crops when present in the soil.

Cerium has no chemical partner in the plant tissue and is not biotransformed in the soya bean

One must keep in mind that once engineered nanoparticles enter the food chain this is an accumulative process.

not only whether man-made nanoparticles can be taken up from soil but also how they are biotransformed in the plants. concludes Jorge Gardea-Torresdey.

Whilst we are not able to directly attribute nanoparticle ingestion to any particular disease or symptoms we know from the latest laboratory studies the potency some have in terms of infiltrating our cells and tissue and causing harm.

The technology relies on inert nontoxic magnetic nanoparticles that are inserted into the living cells. Researchers can then use magnets to lift

and hard-wearing nanocomposites is obtaining an even distribution of the nanoparticles in the metal matrix.

They then injected a slurry of aluminum oxide nanoparticles into the holes and heated the sheet in an oven.

Placing the nanoparticles in the sheet prior to the friction stir processing step significantly increased the concentration of nanoparticles in the composite.

They first demonstrated that the nanoparticles were dispersed uniformly which means the material has no weak points.

and without the Al2o3 nanoparticles the team showed that the nanoparticles contributed to the reduction in grain size.

The best nanoparticle distribution and smallest aluminum alloy grains were obtained after passing the rotating tool through the sheet four times.

#Combining antibodies, iron nanoparticles and magnets steers stem cells to injured organsresearchers at the Cedars-Sinai Heart Institute infused antibody-studded iron nanoparticles into the bloodstream to treat

The combined nanoparticle enabled precise localization of the body's own stem cells to the injured heart muscle.

In an attempt to target healing stem cells to the site of the injury researchers coated iron nanoparticles with two kinds of antibodies proteins that recognize

After the nanoparticles were infused into the bloodstream they successfully tracked to the injured area and initiated healing.

and nanoparticles against foodborne pathogens associated with meat and poultry. The results demonstrate that the bacterial pathogens were inhibited significantly by the use of the antimicrobial films said Catherine Cutter professor of food science.

zinc oxide nanoparticles or silver nanoparticles. The compounds then were incorporated into edible films made from pullulan

and nanoparticles vacuum packaged and then evaluated for bacterial growth following refrigerated storage for up to three weeks.

or nanoparticles have the potential to improve the safety of refrigerated fresh or further-processed meat and poultry products said Cutter.

they magnetised the tag by attaching iron oxide nanoparticles. Experiments in the lab showed that the tiny tags dispersed well in the oil

if the concentration of nanoparticles does not match the original value other oil--presumably substandard--must have been added.

when synthetic DNA nanoparticles are floating around in it? These are things that we already ingest today says Grass.

When exposed to hydrogen sulfide the nanoparticles'fluorescent properties immediately change. When pumped out of a production well the particles can be analyzed with a spectrometer to determine the level of contamination This paper is a big step

because we're making our nanoreporters detect something that's not oil Wong said suggesting the possibility that nanoparticles may someday be able to capture sulfur compounds before they can be pumped to the surface.

We found the longer the PVA polymer chains the more stable the nanoparticles were in the high temperatures they're subjected to said Rice graduate student Chih-Chau Hwang co-lead author of the paper with fellow graduate student Gedeng Ruan.

along with DNA enveloped in nanoparticles. If the film is destroyed both the foam and the dye are released thereby rendering the cash useless.

The DNA nanoparticles that are released also mark the banknotes so that their path can be traced. Laboratory experiments with 5 euro banknotes have shown that the method is effective.

Conventional copper electrodes consist of individual nanoparticles that just sit on top of each other Kanan said. Oxide-derived copper on the other hand is made of copper nanocrystals that are linked all together in a continuous network with well-defined grain boundaries.

Research to find the best nanofluid for heat transfera mixture of diamond nanoparticles and mineral oil easily outperforms other types of fluid created for heat-transfer applications according to new research by Rice university.

Brownian motion and nanoparticle/fluid interactions play an important role Taha-Tijerina said. We observed enhancement in thermal conductivity with incremental changes in temperature and the amount of nanodiamonds used.

which had taken not sufficiently into account the growth of nanoparticles caused by these compounds produced in boreal regions.

#New pomegranate-inspired design solves problems for lithium-ion batteriesan electrode designed like a pomegranate--with silicon nanoparticles clustered like seeds in a tough carbon rind--overcomes several remaining

or nanoparticles that are too small to break into even smaller bits and encasing the nanoparticles in carbon yolk shells that give them room to swell

and shrink during charging. The new study builds on that work. Graduate student Nian Liu and postdoctoral researcher Zhenda Lu used a microemulsion technique common in the oil paint

and find a cheaper source of silicon nanoparticles. One possible source is rice husks: They're unfit for human food produced by the millions of tons and 20 percent silicon dioxide by weight.

According to Liu they could be transformed into pure silicon nanoparticles relatively easily as his team recently described in Scientific Reports.

Plasmon-generated electrons timed moving from nanorods to grapheneplasmonic nanoparticles developed at Rice university are becoming known for their ability to turn light into heat

They suggest that the extraction of electrons generated by surface plasmons in metal nanoparticles may be optimized.

Dark-field scattering and photoluminescence spectroscopy of more than 200 nanoparticles helped them determine that it takes about 160 femtoseconds (quadrillionths of a second) for an electron to transfer from the particle to highly conducting graphene the single-atom-thick form of carbon.

but how fast usable electrons flow from plasmonic nanoparticles is understood little. The plasmon generates hot electrons that decay very quickly so intercepting them is a challenge he said.

That thought prompted Link's lab to embark upon the painstaking effort to analyze single nanoparticles.

and the shape of the nanoparticle Hoggard said. And it usually appears as a single peak for gold nanorods.

when nanoparticles are introduced into an electron-accepting environment which in this case is graphene. The Rice lab hopes to optimize the connection between the nanoparticles

and graphene or another substrate preferentially a semiconductor that will allow them to trap hot electrons.

This morning we're reading about nanotechnology. 1.)From pomegranate peel to nanoparticles. Food waste is a growing problem in many parts of the world,

but discarded fruit peel, in the case of pomegranates, could be put to good use in the burgeoning field of nanotechnology according to research published in the International Journal of Nanoparticles. 2.)U s. Government Accountability Office

the nanoparticles coalesced into tiny grains comprising numerous nanotwin domains. The resulting transparent lumps of cubic boron nitride (pictured) were riddled with nanotwin segments that are just 3. 8 nanometers thick on average.