Mar
23
2010

Adding Carbon Nanotubes to Epoxy Yields a Composite Three Times Harder and Far Better at Conducting Heat

Ever since Carbon Nanotubes debuted a decade ago, scientists have touted the strength attainable by ordinary materials reinforced with these strands of pure carbon. Subsequent studies have added superior heat-conducting properties to the futuristic fibers’ portfolio of benefits.

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Now this longstanding promise of super fortified heat-conducting materials has become a reality. University of Pennsylvania scientists have determined that adding a relatively small number of carbon Nanotubes to epoxy yields compound three-and-a-half times as hard and far better at heat conductance than the product found in hardware stores. The team created a composite of 95 to 99 percent common epoxy mixed with 1 to 5 percent Carbon Nanotubes, filaments of carbon less than one-ten-thousandth the width of a human hair.

These findings add considerably to Carbon Nanotubes’ luster as possible additives to a variety of materials. In addition to adhesives such as epoxy, nanotube-based greases that might be used to carry heat away from electronic chips.” Determination of epoxy doped with Nanotubes showed a 125 percent increase in thermal conductivity at room temperature.

For some time, scientists have been intrigued by Nanotubes, pure carbon cylinders with walls just one atom thick. First created by zapping graphite with lasers, the structures have become one of the marvels of the nanotechnology world: 100 times as strong as steel and capable of far greater electrical conductivity than other carbon-based materials. Researchers have envisioned the miniature strands bulking up brittle plastics and conducting current in ever-smaller electrical circuits, among other possibilities, and have made significant strides in the large-scale synthesis of Nanotubes.

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Carbon Nanotubes are the best heat-conducting material ever recorded, the first suggestion that the exotic strands might someday find applications as miniature heat conduits in a host of devices and materials. Epoxy is an attractive target for fortification with carbon Nanotubes, Johnson said, because it’s relatively easy to mix the minuscule filaments into it, and there are clear industrial benefits in a harder, better-conducting epoxy. Other scientists have attempted to fortify epoxy with carbon Nanotubes, but Johnson’s group succeeded in dispersing the Nanotubes more evenly.

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By Preeti (Admin) | Posted in Nanoshel News | Comments (1)
Mar
03
2010

Robust Free-Standing TiO2 Nanofibre Membrane

With the rapid industrialization over the past two decades, the demand for drinking water as a precious resource has increased tremendously in terms of quantity and quality. The scarcity of such a precious resource in the world has led the water reclamation for the conservation and recovery of drinking water. However, the presence of contaminants such as natural organic matters (NOMs) and trace organics accumulate in raw water creates a major problem.

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Existing chemical methods to remove the contaminants lead to carcinogenic byproducts and existing micro/ultra filtration membranes are susceptibe to fouling and leakage of contaminants through the membrane pores.

Dr Darren Sun and his team from NTU have developed an inexpensive, robust and free standing TiO2 nanofiber membrane to overcome these disadvantages. The membrane is non-toxic and acts as both filtration membrane and photocatalyst in water technologies. This material can also be used in solar condition. These unique properties give rise to various applications particularly in producing cost effective commercial filtration membrane that could dramatically reduce the cost of water production and could provide new source of hydrogen and fuel cell. For more information, contact Dr. Darren Sun at ddsun@ntu.edu.sg

Visit our company website www.nanoshel.com for excellent quality Nano TiO2 Materials

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By Preeti (Admin) | Posted in Nanoelectronics, Nanomedicine, Nanoshel News, Nanotechnology Research & Applications, Nanotubes | Tagged , , | Comments (0)
Mar
03
2010

High Performance, Energy Saving Nanofiltration (NF) Membranes for Water Purification

Nanofiltration is an emerging an energy-efficient separation process with the potential applications in many industries ranging from water, chemical, food, pharmaceuticals, petrochemical and environmental (pollution prevention) industries. Reduced operation cost, avenues for integrated processing, clean and environmental friendly processing are the main drivers for the nanofiltration operation. However, the limited choices of commercially available nanofiltration membranes, low fluxes, high cost of the nanofiltration membranes, membrane fouling and membrane stabilities during operation (chemical, thermal and structural stabilities) remained as the major concerns for the processors.

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Prof. Seeram Ramakrishna and his team at NUS have developed nanofiltration membranes made of extremely thin film of polyamide layer, highly permeable fibrous support and engineered nonwoven backing layer. The polyamide layer is acting as a salt barrier layer. The pores in the barrier layer are efficient enough to reject the divalent salts and small size molecules (undesirable compounds) from the feed water, while allowing the water to pass through the membrane at extremely high flow rate. Engineered surface of these membranes offers unique advantage to control fouling tendency and to enhance membrane lifetime and to reduce the membrane replacement cost. Key advantages of the membrane include:

•Energy saving (highly permeable) salt barrier membrane
•Suitable for achieving high flux, throughput and separation performance
•Engineered surface to control fouling phenomena
•Structurally durable and pressure tolerant architecture
•Adequate mechanical strength for assembling cartridges

For more information contact seeram@nus.edu.sg or nnibrs@nus.edu.sg

Visit our Nano Filteration Products - www.nanoshel.com

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By Preeti (Admin) | Posted in Nanoshel News, Nanotechnology Research & Applications, Nanotubes | Tagged , , , , | Comments (0)
Jan
31
2010

Nanoshel colloids for horticulture

Agriculture Applications

Nowadays, hundreds of chemical materials are presented to the markets for protecting plants against pathogenic agents by manufacture companies in the world, that they unfortunately, damage environment very much. With introducing and discovery of nanotechnology inventions in Nano biotechnology department, now is able to produce and present Nanoshel as an antibacterial material that has lots of properties such as controlling pests and plant pathology in agriculture field.

Nanoshel colloids for horticulture

Controlling pests and investigation on plant pathology field on the basis of Nano biotechnology is one of the ways of challenging that is highly appreciated by researchers and experts because of the dangers that using chemical materials and vast usage of anti pests has for environment, human beings and all other beings, and this new field is extending in the world day to day.

Preferences: 1.Easy application by direct spray on the plants. 2.Non-chemical base of these products, and agreeable and friendly with environment. 3.Not creating resistance against kinds of bacteria and microbes. 4.Stability of its antibacterial property, considerably. 5.Nanoshel is not poisonous and produced with silver (metal) 6.Danger less for humans and domesticated animals. 7.More economical.

Nanoshel colloids for herbs

•Controlling pests and diseases, sterilization of implant bed by Nanoshel. The effective material of pharmaceutical plants and outcome essence don’t have any chemical material. •Nanoshel is effective on controlling pathogen agents in under control greenhouses and plantation environments. Nanoshel can be used in sterilization of agriculture tools and equipments, farms, plantation bed, seed sterilization, packing, sterilization of bottles and gallon. •Nanoshel has considerable effects on essence shelf life and pharmaceutical plants.

Now, Nanoshel with technical knowledge and local innovation and creativity and up to date technology is at the service of alteration industry in agriculture department. Visit www.nanoshel.com for more information. Mail us at sales@nanoshel.com Agriculture products are available with the company

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By Preeti (Admin) | Posted in Nanoshel News | Tagged , , | Comments (0)
Jan
31
2010

Advance in ‘nano-agriculture’: Tiny stuff has huge effect on plant growth

Advance in ‘nano-agriculture’: Tiny stuff has huge effect on plant growth

With potential adverse health and environmental effects often in the news about nanotechnology, scientists in Arkansas are reporting that carbon nanotubes (CNTs) could have beneficial effects in agriculture. Their study, scheduled for the October issue of ACS Nano, a monthly journal, found that tomato seeds exposed to CNTs germinated faster and grew into larger, heavier seedlings than other seeds. That growth-enhancing effect could be a boon for biomass production for plant-based biofuels and other agricultural products, they suggest.
Mariya Khodakovskaya, Alexandru Biris, and colleagues note that considerable scientific research is underway to use nanoparticles — wisps 1/50,000th the width of a human hair — in agriculture. The goals of “nano-agriculture” include improving the productivity of plants for food, fuel, and other uses.
The scientists report the first evidence that CNTs penetrate the hard outer coating of seeds, and have beneficial effects. Nanotube-exposed seeds sprouted up to two times faster than control seeds and the seedlings weighed more than twice as much as the untreated plants. Those effects may occur because nanotubes penetrate the seed coat and boost water uptake, the researchers state. “This observed positive effect of CNTs on the seed germination could have significant economic importance for agriculture, horticulture, and the energy sector, such as for production of biofuels,” they add.

ARTICLE “Carbon Nanotubes Are Able To Penetrate Plant Seed Coat and Dramatically Affect Seed Germination and Plant Growth”
CONTACT: Mariya Khodakovskaya, Ph.D. or
Alexandru S. Biris, PhD
Department of Applied Science
University of Arkansas
Little Rock, Ark. 72211
Phone: 501-371-7506 (Khodakovskaya) or 501-683-7456 (Biris)
Email: mvkhodakovsk@ualr.edu or asbiris@ualr.edu

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