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Keyword: nanoparticles

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  • Sound solution to nanoparticle handling problems

    08/04/2013 2:40:03 PM PDT · by neverdem · 9 replies
    Chemistry World ^ | 2 August 2013 | Hayley Birch
    Nickel oxide nanoparticles glued together with ultrasound lost none of their catalytic activity © Wiley-VCHResearchers are using ultrasound to bond nanoparticles – essentially sticking together particles too small to be seen with sounds too high-pitched to be heard. The technique apparently preserves the special properties of nanomaterials, while producing micro-scale particles that are easier to handle.Jake Barralet at McGill University in Montreal, Canada, and colleagues show they can take nanoparticles, coat them in phosphate and then weld them together in an ultrasonic bath to form microparticles around 200µm in size.A chance discovery, the team initially assumed the phenomenon was...
  • Nanomagnets clean blood

    08/01/2013 5:10:35 PM PDT · by neverdem · 6 replies
    Chemistry World ^ | 25 July 2013 | Rowan Frame
    Nanoparticles that never have to enter the body can capture harmful components in blood, scientists in Switzerland have shown.Removing unwanted molecules from the blood is the most direct way to cure or prevent many illnesses. An example of this approach is dialysis where small molecules like urea are filtered out to treat patients with renal failure. As this separation method is size-selective, larger noxious molecules or cells cannot be efficiently eliminated from the blood in this way.Nanoparticles with capturing agents attached to their surface can remove larger molecules from blood. However, the risks of nanoparticles inside the body are not...
  • T2 Bio publishes data supporting diagnostic test T2Candida® in Science Translational Medicine

    04/28/2013 8:27:53 PM PDT · by neverdem · 3 replies
    EurekAlert! ^ | 24-Apr-2013 | NA
    Breakthrough approach to rapid detection of Candida species directly from whole blood with T2 Magnetic resonance demonstrated in first patient samples Lexington, MA, April 24, 2013 (Embargoed until 2:00 PM US Eastern Time) – T2 Biosystems, a company developing direct detection products enabling superior diagnostics, today announced the publication of research supporting the Company's flagship diagnostic test, T2Candida®, in Science Translational Medicine. The research highlights T2Candida as a breakthrough approach to rapid and sensitive identification of species-specific Candida, a sepsis-causing fungus, directly from whole blood in approximately three hours, or up to 25 times faster than the current gold standard...
  • Colour changing nanoparticles inspired by deep sea denizens

    04/24/2013 7:41:26 PM PDT · by neverdem · 3 replies
    Chemistry World ^ | 24 April 2013 | James Urquhart
    Cuttlefishes' camouflage skills have many admirersInspired by the camouflage abilities of marine organisms, such as the cuttlefish, US researchers have created striped ellipsoid particles using controlled self-assembly of diblock copolymers. By swelling and rotating the particles their colour can be changed, which could lead to a variety of optical applications including computer displays and better camouflage.Cuttlefish blend into their environment because their skin has cells containing striped structures. These structures have a layer of pigmented sacs called chromatophores and a layer of reflecting plates called iridophores. By contracting and relaxing muscles attached to chromatophores they can control the amount of...
  • Striped nanoparticle controversy blows up

    12/08/2012 11:14:18 PM PST · by neverdem · 9 replies
    Chemistry World ^ | 7 December 2012 | Simon Hadlington
    Some scientists question the existence of self-assembling stripes on nanoparticles © NPGA prickly controversy has erupted in the rarefied world of nanoscience revolving around the strength of the evidence that molecules can assemble themselves into discrete stripes around gold nanoparticles. The issue highlights the difficulty of interpreting images of nanoscale objects.For many years researchers have been decorating gold nanoparticles with thiolated ligands to imbue the nanoparticles with a range of properties. In 2004, a group led by Francesco Stellacci, then at the Massachusetts Institute of Technology in the US, published a paper in Nature Materials demonstrating that if two different...
  • Breakthrough nanoparticle halts multiple sclerosis

    11/21/2012 11:41:34 PM PST · by LibWhacker · 21 replies
    EurekAlert! ^ | 11/18/12 | Marla Paul
    New nanotechnology can be used for Type 1 diabetes, food allergies and asthma New nanoparticle tricks and resets immune system in mice with MSFirst MS approach that doesn't suppress immune systemClinical trial for MS patients shows why nanoparticle is best optionNanoparticle now being tested in Type 1 diabetes and asthma CHICAGO --- In a breakthrough for nanotechnology and multiple sclerosis, a biodegradable nanoparticle turns out to be the perfect vehicle to stealthily deliver an antigen that tricks the immune system into stopping its attack on myelin and halt a model of relapsing remitting multiple sclerosis (MS) in mice, according...
  • A Shotgun for Blood Clots

    07/06/2012 7:27:58 PM PDT · by LibWhacker · 18 replies
    Science Magazine ^ | 7/5/12 | Krystnell A. Storr
    Think of it as Liquid-Plumr for the circulatory system. Researchers have designed a clump of tiny particles that rides the current of the bloodstream, seeks out life-threatening blood clots, and obliterates them. The approach works in mice and could soon move on to human trials. Blood clots are bad news for the brain, heart, and other organs. These masses of blood cells can grow big enough to choke off veins and arteries, preventing oxygen from flowing to critical organs. One of the chief obstacles to dealing with blood clots is finding where they have lodged in the body. Even if...
  • Remote-controlled genes trigger insulin production

    05/06/2012 1:56:24 PM PDT · by neverdem · 6 replies
    Nature News ^ | 03 May 2012 | Helen Shen
    Nanoparticles heated by radio waves switch on genes in mice Researchers have remotely activated genes inside living animals, a proof of concept that could one day lead to medical procedures in which patients’ genes are triggered on demand. The work, in which a team used radio waves to switch on engineered insulin-producing genes in mice, is published today in Science1. Jeffrey Friedman, a molecular geneticist at the Rockefeller University in New York and lead author of the study, says that in the short term, the results will lead to better tools to allow scientists to manipulate cells non-invasively. But with...
  • Solar Breakthrough: Cheap Quantum Dot Solar Paint

    12/28/2011 1:22:04 PM PST · by bananaman22 · 21 replies
    Oilprice.com ^ | 24/12/2011 | John Daly
    Researchers have reduced the preparation time of quantum dot solar cells to less than an hour by changing the form to a one-coat quantum dot solar paint. How? Titanium dioxide (TiO2) nanoparticles are coated with cadmium sulfide (CdS) or cadmium selenide (CdSe.) The composite nanoparticles, when mixed with a solvent, form a paste that can be applied as one-step paint to a transparent conducting material, which creates electricity when exposed to light. Although the paint form is currently about five times less efficient than the highest recorded efficiency for the multifilm form, the researchers predict that its efficiency can be...
  • Nanoparticles help reveal hidden fingerprints

    04/03/2011 9:15:04 PM PDT · by neverdem · 6 replies
    Chemistry World ^ | 01 April 2011 | Hayley Birch
    Criminal investigations may benefit from new forensic methods based on nanoparticles. A technique using gold nanoparticles in combination with antibodies has shown promising results for enhancing fingerprints that are over a week old. Fingerprinting, first reported in the 19th century, is still the primary source of evidence used in crime scene investigation and new methods for improving fingerprint visualisation remain in demand. Unseen (latent) fingerprints can be revealed using chemical treatments that target molecules likely to be deposited in fingerprints, such as those in hair follicle secretions. Xanthe Spindler at the University of Technology Sydney in Australia and colleagues now report a...
  • 'Good cholesterol' nanoparticles seek and destroy cancer cells (siRNA nanoparticles)

    04/01/2011 12:26:50 PM PDT · by decimon · 5 replies
    Scientists package HDL with gene-silencing siRNA to target tumors, spare normal tissueHOUSTON - High-density lipoprotein's hauls excess cholesterol to the liver for disposal, but new research suggests "good cholesterol" can also act as a special delivery vehicle of destruction for cancer. Synthetic HDL nanoparticles loaded with small interfering RNA to silence cancer-promoting genes selectively shrunk or destroyed ovarian cancer tumors in mice, a research team led by scientists from The University of Texas MD Anderson Cancer Center and the University of North Texas Health Science Center reports in the April edition of Neoplasia. "RNA interference has great therapeutic potential but...
  • Ferrofluids help you see better

    12/26/2010 1:28:34 PM PST · by neverdem · 7 replies · 2+ views
    Chemistry World ^ | 22 December 2010 | Patricia Pantos
    US researchers have used ferrofluids as liquid pistons that could be used to make adjustable liquid lenses with nearly perfect spherical interfaces for applications such as an optometrist's phoropter. A phoropter measures the way light is focused in the eye and is used to determine prescriptions for glasses and contact lenses. Ferrofluids are colloidal solutions of ferromagnetic nanoparticles suspended in a dispersing liquid. Ferrofluid droplets can be manipulated by a magnetic field, so they could be used in systems that need precise control, such as optics, drug delivery, and electronic devices. Amir Hirsa and colleagues from Rensselaer Polytechnic Institute in Troy, New...
  • Nanoparticles and ultrasound team up to treat tumours

    08/09/2010 4:02:33 PM PDT · by neverdem · 4 replies
    Chemistry World ^ | 03 August 2010 | Lewis Brindley
    A new, non-invasive method to deliver drugs to the brain has been developed by Taiwanese researchers. Using a combination of magnetic nanoparticles and focused ultrasound to pinpoint specific areas, the technique could be very helpful in treating brain tumours. 'The difficulty with treating brain tumours is that the brain is protected by the blood-brain barrier,' explains Pin-Yuan Chen, who led the research at Chang Gung Memorial Hospital in Taiwan. 'This prevents chemotherapy drugs from entering the brain. However, we can open up this barrier in desired locations using focused ultrasound. This allows us to target our treatment effectively and safely.' Chen's team injected magnetic nanoparticles coated with...
  • Light Bends Matter, Surprising Scientists

    03/25/2010 10:57:48 AM PDT · by neverdem · 31 replies · 1,155+ views
    LiveScience ^ | 24 March 2010 | Clara Moskowitz
    After 72 hours of exposure to ambient light, strands of nanoparticles twisted and bunched together. Credit: Nicholas Kotov Light can twist matter, according to a new study that observed ribbons of nanoparticles twisting in response to light. Scientists knew matter can cause light to bend – prisms and glasses prove this easily enough. But the reverse phenomenon was not shown to occur until recently. The researchers assembled strings of nanoparticles, which are tiny clumps of matter on the scale of nanometers (one nanometer is one billionth of a meter). In a darkened lab, the scientists linked nanoparticles together into...
  • Nanoparticles successfully deliver RNA interference in cancer patients

    03/22/2010 7:07:54 PM PDT · by neverdem · 15 replies · 567+ views
    Chemistry World ^ | 21 March 2010 | Simon Hadlington
    US scientists have created a nanoparticle drug that acts like a stealth bomber to smuggle its RNA-interfering payload past the body's defence systems and drop it on to cancer cells. It is, say the researchers, the first example of a nanoparticle that can seek out its target after being injected into the bloodstream and paves the way for the selective targeting of cells and tissues in the body while causing only little   'collateral damage' in the form of side effects. "This is the first proof of concept that RNA interference can occur in a human from delivered siRNA" - Mark...
  • Grant Aims to Reduce Cost of Wind Turbines for Generating Electricity(Shows Promise-Combat'g Cancer)

    02/04/2010 1:49:30 PM PST · by gibtx2 · 5 replies · 245+ views
    Georgia Institute of Technology ^ | Feb 4, 2010 taken from Georgia Institute of Technology | ScienceDaily (Feb. 4, 2010)
    A technology originally developed to increase lift in aircraft wings and simplify helicopter rotors may soon help reduce the cost of manufacturing and operating wind turbines used for generating electricity. This “circulation control” aerodynamic technology could allow the wind turbines to produce significantly more power than current devices at the same wind speed. Research aimed at adapting circulation control technology to wind turbine blades will be conducted by a California company, PAX Streamline, in collaboration with the Georgia Institute of Technology. The two-year project, which will lead to construction of a demonstration pneumatic wind turbine, will be supported by a...
  • Small nanoparticles bring big improvement to medical imaging

    11/22/2009 10:40:46 PM PST · by neverdem · 2 replies · 525+ views
    If you're watching the complex processes in a living cell, it is easy to miss something important—especially if you are watching changes that take a long time to unfold and require high-spatial-resolution imaging. But new research* makes it possible to scrutinize activities that occur over hours or even days inside cells, potentially solving many of the mysteries associated with molecular-scale events occurring in these tiny living things. A joint research team, working at the National Institute of Standards and Technology (NIST) and the National Institute of Allergy and Infectious Diseases (NIAID), has discovered a method of using nanoparticles to illuminate...
  • Instant insight: Self-healing at the nanoscale

    10/08/2009 11:56:51 PM PDT · by neverdem · 2 replies · 410+ views
    Chemical Technology ^ | 06 October 2009 | NA
    Vincenzo Amendola and Moreno Meneghetti, at the University of Padova, Italy, take inspiration from nature to design materials that can repair themselves.Nature uses self-healing in all living systems to repair damage caused by environmental interactions. A simple case is repairing a skin wound - without this mechanism, we could not live. DNA repair, which must occur routinely in every living organism, is another example. But at what level do repairing mechanisms occur? Looking at the components of a living system, we find cells, which typically have micrometre dimensions. But we have to zoom in further, namely to the nanoscale, to...
  • Nanoparticles could pose threat to humans: scientists

    09/16/2009 12:44:37 PM PDT · by NormsRevenge · 9 replies · 804+ views
    AFP on Yahoo ^ | 9/16/09 | AFP
    VIENNA (AFP) – They can make fabric resistant to stains, improve the taste of food and help drug research, but nanoparticles could also pose a danger to human health, experts warned Wednesday. Susanne Stark, of the Consumer Information Association, told a seminar in the Austrian city of Salzburg that companies should be forced to indicate on labels whether a product contains the tiny particles. "There are more questions than answers on the effects of nanoparticles" on human health, the chemist said. Cosmetic and food products should indicate whether their products contain nanoparticles by 2012, she said. Nanoparticles, measuring no more...
  • All that is small is not nano

    09/13/2009 8:42:30 PM PDT · by neverdem · 2 replies · 366+ views
    Chemistry World ^ | 13 September 2009 | Hayley Birch
    US and French scientists say the term 'nanoparticle' needs to be redefined to provide a focus for environmental, health and safety studies, and future regulation. According to the researchers, nanomaterials should be categorised based on novel properties that are related to their small size - not, crucially, their size alone.In most countries, few or no specific regulations exist to govern the safe use of nanoparticles, despite their wide use in cosmetics, sun screens and some drug products. Until a decision can be reached on what exactly constitutes a nanoparticle, however, there can be no clear path forward. Although traditionally thought...
  • 'Chemical nose' sensor sniffs blood protein profile

    08/29/2009 11:24:02 AM PDT · by neverdem · 1 replies · 412+ views
    Chemistry World ^ | 24 August 2009 | Phillip Broadwith
    US scientists have developed a sensor system for profiling the protein content of human blood serum without needing individual receptors for each separate protein. The technique could be used to provide cheap preliminary disease diagnosis information, saving time and money by reducing unnecessary testing.There is a direct link between levels of protein in human serum and disease, making protein levels an attractive target for sensors and diagnostics. However, with over 20,000 proteins present in human serum at a range of different concentrations, developing an effective sensor has been a challenging task.Pattern recognition sensing uses detector systems that interact with many...
  • Nanoparticle safety in doubt - Lung damage in Chinese factory workers sparks health fears.

    08/22/2009 1:08:50 PM PDT · by neverdem · 8 replies · 951+ views
    Nature News ^ | 18 August 2009 | Natasha Gilbert
    Could nanoparticles cause some lung damage?C. Juste/Miami Herald/Newscom Claims that seven Chinese factory workers developed severe lung damage from inhaling nanoparticles are stoking the debate over the environmental-health effects of nanotechnology.A paper published in the European Respiratory Journal claims to be the first to document cases of ill health caused by nanoparticles in humans (Y. Song, X. Li and X. Du Eur. Respir. J. 34, 559 - 567; 2009). Other experts are sceptical as to whether nanoparticles are actually to blame, but the paper has triggered lively discussions."The study raises the bar for doing appropriate research as fast as possible to...
  • Nanoparticles make 'self-erasing' images

    06/19/2009 11:45:52 PM PDT · by neverdem · 8 replies · 576+ views
    Chemistry World ^ | 19 June 2009 | Jon Cartwright
    Materials displaying 'self-erasing' colour images have been created by chemists in the US, who have studied how certain nanoparticles can assemble and disassemble themselves under different wavelengths of light.The materials, which are printed with ultraviolet (UV) light and erased with visible light, could one day be used for self-expiring bus tickets or for carrying secret messages.'Self-erasing papers are important for time-sensitive materials and secure communications,' said study leader Bartosz Grzybowski of Northwestern University in Evanston, Illinois. 'On the fundamental level, what we describe is also a very different way of looking at the concept of information storage. We're not using traditional coloured inks per se,...
  • DVDs to harness hyperspace - Gold nanorods could boost capacity of next-generation disks.

    05/23/2009 1:35:38 PM PDT · by neverdem · 20 replies · 1,225+ views
    Nature News ^ | 20 May 2009 | Zeeya Merali
    DVDs are set to explore new dimensions.Punchstock Spreading into extra dimensions could help next-generation DVDs to store even more data than they currently do. The new technique could squeeze around 140 times the capacity of the best Blu-rays into a standard-sized disk. Traditional DVDs and Blu-ray disks store data in two dimensions, and there's been a recent push to increase their capacity by creating multi-layered disks that store data across three dimensions. But, asks James Chon at the Swinburne University of Technology in Melbourne, Australia, why stop there?Chon and his colleagues are stepping into hyperspace, by encoding information in two...
  • Self-Assembling Optics

    01/05/2009 11:20:30 PM PST · by neverdem · 7 replies · 700+ views
    thefutureofthings.com ^ | December 23, 2008 | Roni Barr
    A group of researchers led by Peidong Yang, a professor of chemistry at the University of California, Berkeley, have recently created nanoscale particles that can self-assemble into various optical devices. These include photonic crystals, metamaterials, color changing paints, components for optical computers and ultrasensitive chemical sensors, among many other potential applications. The new technology works by controlling how densely the tiny silver particles assemble themselves.   Professor Peidong Yang (Credit: University of California, Berkeley) The nanoparticles have been used to increase the sensitivity of arsenic detection by an order of magnitude. Researchers also made a very robust kind of photonic...
  • Nanoparticles Take On Tumors

    07/08/2008 9:54:12 PM PDT · by neverdem · 11 replies · 199+ views
    ScienceNOW Daily News ^ | 8 July 2008 | Rachel Zelkowitz
    Enlarge ImageNanomission.Nanoparticles (blue) hit their target in a pancreatic tumor (top); healthy pancreatic tissue without tumor (bottom left); a pancreatic tumor with nanoparticle (green) targeting the tumor blood cells (bottom right)Credit: (top) Milan Makale/UCSD Cancer Center; (bottom) Bharat Majeti, Eric Murphy, and Milan Makale/UCSD The drugs cancer patients take to destroy their tumors also cause debilitating side effects such as nausea, weight loss, and even heart problems. But now researchers report that they can curb the spread of cancer cells in mice with drug concentrations far lower than the standard dose. The key is using a microscopic particle that...
  • Invisibility Cloak: New Technique To Control Nanoparticles (transparent aluminum?)

    03/07/2008 3:43:08 PM PST · by saganite · 13 replies · 395+ views
    ScienceDaily ^ | 7 March 08 | staff
    Carnegie Mellon University's Michael Bockstaller and Krzysztof Matyjaszewski have created a version of Harry Potter's famed "invisibility cloak" for nanoparticles. Through a collaborative effort, researchers from the departments of Materials Science and Engineering and Chemistry have developed a new design paradigm that makes particles invisible. In a recent edition of Advanced Materials Magazine, the researchers demonstrate that controlling the structure of nanoparticles can "shrink" their visible size by a factor of thousands without affecting a particle's actual physical dimension. "What we are doing is creating a novel technique to control the architecture of nanoparticles that will remedy many of the...
  • Nanoparticles Generate Supersonic Shock Waves to Target Cancer

    01/28/2008 2:07:35 PM PST · by Ernest_at_the_Beach · 4 replies · 135+ views
    PhysOrg.com ^ | January 16, 2008 | Lisa Zyga
    By mixing nanomaterials that act as fuel and oxidizer, researchers have created a combustible nano explosive that can generate shock waves with Mach numbers up to 3. The team of researchers, a collaboration from the University of Missouri-Columbia (UMC) and the U.S. Army, hope that this nano-sized “smart bomb” can target drug delivery to cancer cells, and leave healthy cells unharmed. Their study is published in a recent issue of Applied Physics Letters. “Nanoengineered thermites can produce shock waves, and their properties are similar to some primary lead-based explosives,” Shubhra Gangopadhyay, Professor of Electrical and Computer Engineering at UMC, told...
  • Electric jolt triggers release of biomolecules, nanoparticles

    09/13/2006 7:09:47 PM PDT · by annie laurie · 17 replies · 566+ views
    Eurekalert.org ^ | 11-Sep-2006 | Phil Sneiderman
    Johns Hopkins researchers have devised a way to use a brief burst of electricity to release biomolecules and nanoparticles from a tiny gold launch pad. The technique could someday be used to dispense small amounts of medicine on command from a chip implanted in the body. The method also may be useful in chemical reactions that require the controlled release of extremely small quantities of a material.The technique was described Sept. 10 in a presentation by Peter C. Searson, a Johns Hopkins professor of materials science and engineering, during the 232nd national meeting of the American Chemical Society in San...
  • Preclinical Tests Show Acid-Sensitive Nanoparticles Treat Ovarian Cancers with Little Toxicity

    08/31/2006 5:48:43 PM PDT · by annie laurie · 12 replies · 397+ views
    PhysOrg.com ^ | August 28, 2006 | National Cancer Institute
    Last year, members of the Alliance for Nanotechnology in Cancer based at Northeastern University and the Massachusetts Institute of Technology demonstrated that acid-sensitive polymer nanoparticles could boost the delivery of anticancer drugs into the acidic interior of tumors. Now, that same group of investigators has shown that these nanoparticles are effective at suppressing tumor growth when tested in an animal model of human ovarian cancer. In addition, animals treated with this nanoparticle formulation do not appear to experience adverse side effects that often limit the ability of patients to tolerate chemotherapy. The researchers reported the results of their preclinical work...
  • MIT, Brigham: Nanoparticles Armed to Combat Cancer

    04/11/2006 2:37:10 AM PDT · by LibWhacker · 4 replies · 428+ views
    Bio.com ^ | 4/10/06
    Ultra-small particles loaded with medicine - and aimed with the precision of a rifle - are offering a promising new way to strike at cancer, according to researchers working at MIT and Brigham and Women's Hospital. In a paper to appear the week of April 10 in the online edition of the Proceedings of the National Academy of Sciences, the team reports a way to custom design nanoparticles so they home in on dangerous cancer cells, then enter the cells to deliver lethal doses of chemotherapy. Normal, healthy cells remain unscathed. print this page email this page The team conducted...
  • How Nanoparticles, Nanoshells, And Nanotubes May Provide Powerful Tools Against Cancer

    12/17/2005 8:09:44 PM PST · by Founding Father · 5 replies · 493+ views
    NanoTech Wire ^ | November 17,2005
    They’re but a tiny speck, existing in a variety of forms: particles, tubes, shells, even a soccerball-like shape. They also share a common prefix: “nano,” connoting their size, a billionth of a meter or roughly 25-millionth of an inch. Today, cancer researchers are exploring the potential of such nanostructures to exquisitely target cancer cells without harming surrounding tissue, and to image the formation of tumors long before they have a chance to become life-threatening. While diagnostics and approved therapies are years away, several are nearing clinical studies, while a few already are being tested in patients. A press conference on...
  • Nanoparticles, super-absorbent gel clean radioactivity from porous structures

    07/23/2004 11:48:30 AM PDT · by LibWhacker · 439+ views
    Porous structures, such as brick and concrete, are notoriously hard to clean when contaminated with certain types of radioactive materials. Researchers in Argonne 's Chemical Engineering Division are developing a new technique that can effectively decontaminate these structures in the event of exposure to radioactive elements. Researchers are using engineered nanoparticles and a super-absorbent gel to design a clean-up system for buildings and monuments exposed to radioactive materials. Having this system available will allow the nation to be more prepared in case of a terrorist attack with a "dirty bomb" or other radioactive dispersal device. "If a radioactive device were...