Nanoteknologi

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Nanoteknologi

Innlegg QIQrrr 06 Jul 2010, 17:43

Nature Nanotechnology, July 4, 2010: When Sir William Crookes developed a four-vaned radiometer, also known as the light-mill, in 1873, it was believed that this device confirmed the existence of linear momentum carried by photons, as predicted by Maxwell's equations. Although Reynolds later proved that the torque on the radiometer was caused by thermal transpiration, researchers continued to search for ways to take advantage of the momentum of photons and to use it for generating rotational forces. The ability to provide rotational force at the nanoscale could open up a range of applications in physics, biology and chemistry, including DNA unfolding and sequencing and nanoelectromechanical systems. Here, we demonstrate a nanoscale plasmonic structure that can, when illuminated with linearly polarized light, generate a rotational force that is capable of rotating a silica microdisk that is 4,000 times larger in volume. Furthermore, we can control the rotation velocity and direction by varying the wavelength of the incident light to excite different plasmonic modes - Light-driven nanoscale plasmonic motors


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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 28 Jul 2010, 16:28

American Chemical Society, July 23, 2010: We describe the motion of self-propelled hybrid microengines containing catalase enzyme covalently bound to the cavity of rolled-up microtubes. The high efficiency of these hybrid microengines allows them to move at a very low concentration of peroxide fuel. The dynamics of the catalytic engines is mediated by the generation of front-side bubbles, which increase the drag force and make them turn. The specific modification of the inner layer of microtubes with biomolecules can lead to other configurations to generate motion from different chemical fuels - Dynamics of Biocatalytic Microengines Mediated by Variable Friction Control


A tiny tube powered by bubbles of oxygen generated by degrading hydrogen peroxide
shows its power by pushing around a stack of polystyrene beads. Taken from A Solovev
et al, Adv. Funct. Mater. 2010,
http://dx.doi.org/10.1002/adfm.200902376
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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 01 Sep 2010, 13:20

National Institute of Standards and Technology, August 31, 2010: Physicists at the National Institute of Standards and Technology (NIST) have used a small crystal of ions (electrically charged atoms) to detect forces at the scale of yoctonewtons. Measurements of slight forces—one yoctonewton is equivalent to the weight of a single copper atom on Earth—can be useful in force microscopy, nanoscale science, and tests of fundamental physics theories. A newton is already a small unit: roughly the force of Earth's gravity on a small apple. A yoctonewton is one septillionth of a newton (yocto means 23 zeros after the decimal place, or 0.000000000000000000000001). Measurements of vanishingly small forces typically are made with tiny mechanical oscillators, which vibrate like guitar strings. The new NIST sensor, described in Nature Nanotechnology, is even more exotic—a flat crystal of about 60 beryllium ions trapped inside a vacuum chamber by electromagnetic fields and cooled to 500 millionths of a degree above absolute zero with an ultraviolet laser. The apparatus was developed over the past 15 years for experiments related to ion plasmas and quantum computing - Yikes! NIST Sensor Measures Yoctonewton Forces Fast

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The NIST force sensor is a crystal of ions (charged atoms) trapped inside the upper region of the copper cylinder. A laser beam directed upward through the trap cools the ions. A force is applied in the form of oscillating electric field, and a detector (not shown) measures the light reflected off the ions.
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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 05 Sep 2010, 21:32

Caltech, September 2, 2010: Researchers at Caltech have devised a new technique—using a sheet of carbon just one atom thick—to visualize the structure of molecules. The technique, which was used to obtain the first direct images of how water coats surfaces at room temperature, can also be used to image a potentially unlimited number of other molecules. A paper describing the method and the studies of water layers appears in the September 3 issue of the journal Science. Whereas the data from one molecule might reveal the gross structure, data from 10 will reveal finer features—and computationally assembling the data from 1,000 identical molecules might reveal every atomic nook and cranny - Caltech Chemists Develop Simple Technique to Visualize Atomic-Scale Structures

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 22 Okt 2010, 11:09

Chemistry World, October 21, 2010: In certain circumstances, sapphire nanowires grow by executing an unexpectedly frenetic dance, where oxygen atoms change between partners in vapour, liquid and solid phases. That dance has now been captured by Sang Ho Oh of Pohang University of Science and Technology (Postech) in Korea. 'Our observations are the first of nanowire growth mechanisms at atomic scale in real time,' Oh told Chemistry World. To get such detailed images, Oh produced sapphire nanowires using a vapour-liquid-solid (VLS) nanowire growth technique directly on a transmission electron microscope's 'hot stage'. VLS growth is common in nanowire production, and several groups have already observed it directly, Oh notes. 'The problem was resolution,' he says. 'They can see nanowires grow under the liquid phase, but nothing more about how material is transported, and whether the interface between three phases - the triple junction - would be stationary or dynamic' - Dancing facets reveal nanowire kinetics


Oscillatory Mass Transport in Vapor-Liquid-Solid Growth of Sapphire Nanowires
A growing nanowire of sapphire (aluminium oxide) shows how the surface
facets appear and disappear in a 2-steps forward, one step back dance.
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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 09 Nov 2010, 11:31

Georgia Institute of Technology, November 8, 2010: Blinking numbers on a liquid-crystal display (LCD) often indicate that a device’s clock needs resetting. But in the laboratory of Zhong Lin Wang at Georgia Tech, the blinking number on a small LCD signals the success of a five-year effort to power conventional electronic devices with nanoscale generators that harvest mechanical energy from the environment using an array of tiny nanowires. In this case, the mechanical energy comes from compressing a nanogenerator between two fingers, but it could also come from a heartbeat, the pounding of a hiker’s shoe on a trail, the rustling of a shirt, or the vibration of a heavy machine. While these nanogenerators will never produce large amounts of electricity for conventional purposes, they could be used to power nanoscale and microscale devices – and even to recharge pacemakers or iPods - Energy Harvesting: Nanogenerators Grow Strong Enough to Power Small Conventional Electronic Devices

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 21 Nov 2010, 18:17

Nanowerk, November 17, 2010: A multi-disciplinary research team has introduced a novel label-free optofluidic-nanoplasmonic biosensor and demonstrated direct detection of live viruses from biological media at medically relevant concentrations with little to no sample preparation. This novel platform can be easily adapted for point-of-care diagnostics to detect a broad range of viral pathogens in resource-limited clinical settings at the far corners of the world, in defense and homeland security applications as well as in airports or other public spaces. This work is the first demonstration of detection of intact viruses using extraordinary light transmission phenomena in plasmonic nanohole arrays - Nanoplasmonic sensors detecting live viruses set to revolutionize infection diagnostics

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 01 Des 2010, 11:18

Made in IBM Labs: Breakthrough Chip Technology Lights the Path to Exascale Computing

EE Times, November 30, 2010: For nearly a decade, IBM, Hewlett-Packard Co., Intel Corp., Freescale Semiconductor Inc., NEC Electronics Corp., Samsung Electronics Co. Ltd., IMEC and dozens of their partners—from Avago Technologies Ltd. to Luxtera Inc.—have promised silicon photonics as the inevitable future of CMOS. By integrating electrical-to-optical and optical-to-electrical transceivers onto traditional CMOS chips, silicon photonics promises to break the bottleneck now holding back development of exascale computing platforms. IBM now claims to have solved this problem with its CISN technology which is currently being licensing to partners, and which will begin to appear in commercial transceivers starting in 2011 - IBM debuts CMOS silicon nanophotonics

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 10 Des 2010, 13:50

Nanowerk, December 10, 2010: Several nanoparticle drugs are now in clinical trials, and many more are being developed in research labs. These particles hold great potential to improve the performance of existing cancer drugs. While extensive efforts have been devoted for designing therapeutic nanoparticles, a new study by researchers in the U.S. – echoing the journey through the human body in Fantastic Voyage – represents the first example of coupling such drug nanocarriers with self-propelled nanoshuttles - Another nanotechnology step towards 'Fantastic Voyage'


This is the first proof-of-concept of using catalytic nanoshuttles to pick up, transport, and release
common drug carriers including biocompatible and biodegradable polymeric particles and liposomes.
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Re: Nanoteknologi

Innlegg QIQrrr 10 Des 2010, 17:15

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Sandia National Laboratories, December 9, 2010: A benchtop version of the world’s smallest battery — its anode a single nanowire one seven-thousandth the thickness of a human hair—has been created by a team led by Sandia National Laboratories researcher Jianyu Huang. To better study the anode’s characteristics, the tiny rechargeable, lithium-based battery was formed inside a transmission electron microscope (TEM) at the Center for Integrated Nanotechnologies (CINT), a Department of Energy research facility jointly operated by Sandia and Los Alamos national laboratories. Says Huang of the work, reported in the Dec. 10 issue of the journal Science, “This experiment enables us to study the charging and discharging of a battery in real time and at atomic scale resolution, thus enlarging our understanding of the fundamental mechanisms by which batteries work” - World’s smallest battery created at CINT nanotech center

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 21 Des 2010, 05:16

UC Berkeley, December 19, 2010: Researchers at the University of California, Berkeley, have developed a new technique that allows plasmon lasers to operate at room temperature, overcoming a major barrier to practical utilization of the technology. The achievement, described Dec. 19 in an advanced online publication of the journal Nature Materials, is a "major step towards applications" for plasmon lasers, said the research team's principal investigator, Xiang Zhang, UC Berkeley professor of mechanical engineering and faculty scientist at Lawrence Berkeley National Laboratory. "Plasmon lasers can make possible single-molecule biodetectors, photonic circuits and high-speed optical communication systems, but for that to become reality, we needed to find a way to operate them at room temperature," said Zhang - Engineers take plasmon lasers out of deep freeze
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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 27 Jul 2011, 03:31

University of Pennsylvania, July 25, 2011: Penn researchers have helped develop a nanotech device that combines carbon nanotubes with olfactory receptor proteins, the cell components in the nose that detect odors. [...] The Penn team succeeded in building an interface between this complicated protein and a carbon nanotube transistor, allowing them to convert the chemical signals the receptor normally produces to electrical signals, which could be incorporated in any number of tools and gadgets. “Our nanotech devices are read-out elements; they eavesdrop on what the olfactory receptors are doing, specifically what molecules are bound to them,” Johnson said - Penn Researchers Help Graft Olfactory Receptors onto Nanotubes
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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 04 Sep 2011, 20:53

Tufts University, September 4, 2011: A Tufts research team has developed the world’s first single-molecule electric motor—which is a mere 1 nanometer across. They reported the results in a paper published in Nature Nanotechnology on Sept. 4. This development—made possible with a low-temperature scanning tunneling microscope at Tufts, one of only about 100 in the United States—may be the first step toward a new class of devices that could be used in applications ranging from medicine to engineering - The Really Little Engine that Could
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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 05 Sep 2011, 21:38

Agency for Science, Technology and Research, September 5, 2011: The Institute of Materials Research and Engineering (IMRE), a research institute of Singapore’s Agency for Science, Technology and Research (A*STAR), puts Singapore into the Guinness Book of World Records with its controllable, molecule-sized gears, which are officially the world’s smallest! The gears are up 100,000 times smaller than the width of a single strand of hair and can only be viewed using powerful microscopes. [...] The research opens the way for the future development of molecule-sized machines that may lead to innovations like pocket-sized supercomputers, miniature energy harvesting devices and data computing on atomic scale electronic circuits - A Guinness World Record for Singapore with A*STAR IMRE’s world’s smallest working gears

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Nanoteknologi

Innlegg QIQrrr 07 Sep 2011, 00:58

Rice University, September 6, 2011: Cables made of carbon nanotubes are inching toward electrical conductivities seen in metal wires, and that may light up interest among a range of industries, according to Rice University researchers. A Rice lab made such a cable from double-walled carbon nanotubes and powered a fluorescent light bulb at standard line voltage -- a true test of the novel material's ability to stake a claim in energy systems of the future. The work appears this week in the Nature journal Scientific Reports. Highly conductive nanotube-based cables could be just as efficient as traditional metals at a sixth of the weight, said Enrique Barrera, a Rice professor of mechanical engineering and materials science. They may find wide use first in applications where weight is a critical factor, such as airplanes and automobiles, and in the future could even replace traditional wiring in homes - Nanocables light way to the future

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