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Nanosheet

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#Researcher develops optically traceable smart 2-D nanosheet that responds to ph Nanoparticles have the potential to revolutionize the medical industry

the nanosheet. Specifically he designed a strong stable and optically traceable smart 2-D material that responds to ph or the acidity or basicity of its surrounding environment.

Nanosheets are unusual amongst nanotechnology because they do not exactly conform to nanoscale. The sheets that Kim produced are just a few nanometers thick thin enough to earn the nano prefix.

#Nanosheets'structure gives them the ability to change shape from a flat surface to a scroll.

Unfortunately most nanosheets roll and unroll spontaneously. If researchers can design a nanosheet to change form in response to a stimulus they can use it for a number of new applications.

Kim tried adding different polymers to his nanosheets to make them responsive. For this experiment he incorporated a relatively simple polymer that responds to ph. He found that the resulting nanosheet would always curl in basic high ph conditions

and always flatten in acidic low ph conditions. Kim also made his nanosheets responsive to near-infrared light a wavelength of light that is harmless to humans.

Depending on the shape of the nanosheet the near-infrared radiation bounces back with a different wavelength.

In this way Kim can noninvasively track the nanosheets even though he can't see them. Using these optical properties to characterize the nanosheets Kim determined that he could approximate ph. Kim envisions biomedical engineers wrapping drugs inside of scrolled nanosheets

so that when the sheet unrolls it releases the medicine. PH responsive nanosheets for example could prove useful for targeting different parts of the human digestive tract

which changes ph between the acidic stomach and basic intestines. Yet this is only the beginning;

creating a responsive nanosheet is just a matter of adding the right polymer. A nanosheet is like pizza dough Kim said.

Whatever you like to put on it#one topping two toppings anything#you can. A nanosheet with a heat-sensitive polymer could burn surrounding tumors to destroy them functioning as a kind of super-specific chemotherapy.

It's easy to get the nanosheets to the cancer cells explains Kim. Targeting specific tissues is simply a matter of adding the appropriate biomarker

so that the body sends the nanosheet where it belongs. The advantage of the rolling means that this nanosheet can entrap many markers

or drugs securely inside the body said Kim. By encapsulating a dangerous substance such as a cancer-treating drug into a nanosheet doctors can attack very specific parts of the body.

This would decrease the amount of the drug necessary and minimize side effects. There are tons of smart polymers

and metals Kim said explaining the many properties he hopes to incorporate into nanotechnology. This new structure is composite

which means it allows us to mix all different kinds of components. Now Kim just needs to build the right nanosheet for each purpose.

Explore further: Like cling wrap new biomaterial can coat tricky burn wounds and block out infection More information:

Smart Composite Nanosheets with Adaptive Optical Properties Jeong-Hwan Kim Murtaza Bohra Vidyadhar Singh Cathal Cassidy and Mukhles Sowwan Applied materials & Interfaces2014.

#New nanomaterial introduced into electrical machines Lappeenranta University of Technology in Finland has constructed the world's first prototype electrical motor using carbon nanotube yarn in the motor windings.

At present the scientific community worldwide is actively seeking practical applications of 2d semiconductor materials such as Mos2 nanosheets.

along with Dr. Seok-In Na at Chonbuk National University and Dr. Byoung Gak Kim at KRICT synthesized carbon nanosheets similar to graphene using polymer

The research outcome was introduced in Nanoscale a journal of Royal Society of Chemistry in the UK under the title of One-step Synthesis of Carbon Nanosheets Converted from a Polycylic Compound

The research team developed carbon nanosheet in a two-step process which consists of coating the substrate with a plymer solution and heating.

The carbon nanosheet can be mass-produced in a simpler process while having high quality since the new process bypasses the steps that are prone to formation of defects such as elimination of the metal substrate or transfer of graphene to another board.

nanowires and nanosheets at chosen thicknesses and lengths rather than the one-size-fits-all output of a chemical process, with no environmentally harmful residues.

#Physicists Induce Stable Ferroelectricity in Strontium Titanate Nanosheets A team of physicists has defied conventional wisdom by inducing stable ferroelectricity in a sheet of strontium titanate only a few nanometers thick.

#New Nanosheet-Based Photonic crystal Changes Color in Response to Moisture LMU chemists have developed a photonic crystal from ultrathin nanosheets

Lotsch and her team have developed now photonic crystals based on nanosheets of phosphatoantimonic acid. The new nanomaterial is extremely moisture sensitive and at the same time chemically stable,

transparent and easy to fabricate into nanosheets. In comparison with other vapor sensors based on nanosheets, the new photonic architecture displays markedly increased response times, higher sensitivity and long-term stability. his unique combination of properties enables it to track

and color-code finger movements in real time, says Pirmin Ganter, who also works in Bettina Lotsch group.

Taking phosphatoantimonate nanosheets as their basis the Stuttgart scientists then developed a photonic nanostructure which reacts to the moisture by changing colour. f this was built into a monitor,

To this end, the scientists created a multilayer sandwich material with alternating layers of ultrathin phosphatoantimonate nanosheets and silicon dioxide (Sio2) or titanium dioxide nanoparticles (Tio2.

The sandwich structure consisting of phosphatoantimonate nanosheets and oxide nanoparticles is highly stable from a chemical perspective

Metal-oxide nanosheets were arranged on a single plane using a magnetic field. The nanosheets were fixed then in place using a process called light-triggered in-situ vinyl polymerization

where the light helped to stick them together within the polymer. The nanosheets create electrostatic resistance in one direction,

but not the other. The polymer"legs"not only lengthened and contracted at pace, allowing it to move forward,

the team arranged metal-oxide nanosheets into a single plane within a material by using a magnetic field

The nanosheets ended up stuck within the polymer, aligned in a single plane. Due to electrostatic forces, the sheets create electrostatic resistance in one direction but not in the other.

Now scientists report in the journal ACS Nano("Hierarchical Porous Nitrogen-Doped Carbon Nanosheets Derived from Silk for Ultrahigh-Capacity Battery Anodes and Supercapacitors")the development of a new,

The researchers found a way to process natural silk to create carbon-based nanosheets that could potentially be used in energy storage devices.

and reported Oct 7 in the advance online publication of the journal Nature("Peptoid nanosheets exhibit a new secondary-structure motif"),

This atomic-resolution simulation of a two-dimensional peptoid nanosheet reveals a snake-like structure never seen before.

The nanosheet layers include a water-repelling core (yellow), peptoid backbones (white), and charged sidechains (magenta and cyan).

The right corner of the top layer of the nanosheet has been emovedto show how the backbone alternating rotational states give the backbones a snake-like appearance (red and blue ribbons.

The material is a peptoid nanosheet. It a flat structure only two molecules thick, and it composed of peptoids,

which polymers adjoin to form the backbones that run the length of nanosheets. Surprisingly, these molecules link together in a counter-rotating pattern not seen in nature.

a trait that makes peptoid nanosheets larger and flatter than any biological structure. The Berkeley Lab scientists say this never-before-seen design rule could be used to piece together complex nanosheet structures and other peptoid assemblies such as nanotubes and crystalline solids.

What more, they discovered it by combining computer simulations with x-ray scattering and imaging methods to determine, for the first time,

the atomic-resolution structure of peptoid nanosheets. his research suggests new ways to design biomimetic structures,

another DOE Office of Science user facility located at Berkeley Lab. Peptoid nanosheets were discovered by Zuckermann group five years ago.

The research revealed several new things about peptoid nanosheets. Their molecular makeup varies throughout their structure,

This rule doesn apply to peptoid nanosheets. Along their backbones, adjacent monomer units rotate in opposite directions.

and extended into large sheets that are flatter than anything nature can produce. t was a big surprise to find the design rule that makes peptoid nanosheets possible has eluded the field of biology until now,

and therefore decreasing the interaction, between individual layers of Mos2 nanosheets. This exposes a larger fraction of reactive sites along the edges of these surfaces where hydrogen can be produced.

and solid phases of the different materials that made up this nanosheet, they ensured that these different crystals could coexist.

The scientists can individually target each segment of the nanosheet with a light pulse. Varying the power of the light pulses that each section received tuned how intensely they shone,

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

Ning group started pursuing the distinctive properties of nanomaterials, such as nanowires or nanosheets, more than 10 years ago.

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,

POSTECH scientists develop breakthrough technique to easily optimize electrical properties of Polyaniline nanosheets to an unprecedented level in an environmental-friendly and inexpensive way July 7th,

The laser is modulated by a synthetic nanosheet, a multi-segmented, layered material that can emit in red, green,

Their discovery that nanosheets of manganese dioxide can maintain a rechargable sulphur cathode helps to overcome a primary hurdle to building a Li-S battery.

While the researchers found since then that nanosheets of manganese dioxide work even better than titanium oxides

They found that the oxygenated surface of the ultrathin manganese dioxide nanosheet chemically recycles the sulphides in a two-step process involving a surface-bound intermediate, polythiosulfate.

Ning group started pursuing the distinctive properties of nanomaterials, such as nanowires or nanosheets, more than 10 years ago.

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,

These guys have perfected a way of making large quantities of black phosphorus nanosheets with dimensions that they can control.

The result is that the bulk mass separates into a large number of nanosheets that the team filters for size using a centrifuge.

That leaves high-quality nanosheets consisting of only a few layers. iquid phase exfoliation is a powerful technique to produce nanosheets in very large quantities

One potential problem with black phosphorus nanosheets is that they degrade rapidly when in contact with water or oxygen.

the nanosheets are surprisingly long-lived. The big advantage of black phosphorus over graphene is that it has a natural bandgap that physicists can exploit to make electronic devices

But Hanlon and co say the newfound availability of black phosphorus nanosheets has allowed them to test a number of other ideas as well.

For example, they added the nanosheets to a film of polyvinyl chloride, thereby doubling its strength and increasing its tensile toughness sixfold.

They also determined the nonlinear optical response of the nanosheets to a pulsed laser by measuring the amount of light that is transmitted.

Finally, they measured the current through the nanosheets while exposing them to ammonia. They found that the material resistance increased