Showing posts with label nanotubes. Show all posts

2010-03-22

Loading and Selective Release of Cargo in DNA Nanotubes

Clipped from: DNA nanotechnology breakthrough offers promising applications in medicine

DNA Nanotechnology Breakthrough Offers Promising Applications in Medicine

ScienceDaily (Mar. 17, 2010) — A team of McGill Chemistry Department researchers led by Dr. Hanadi Sleiman has achieved a major breakthrough in the development of nanotubes -- tiny "magic bullets" that could one day deliver drugs to specific diseased cells. Sleiman explains that the research involves taking DNA out of its biological context. So rather than being used as the genetic code for life, it becomes a kind of building block for tiny nanometre-scale objects.

Clipped from: YouTube - DNA nanotubes

DNA nanotubes

DNA nanotubes can carry and release cargo on demand

Clipped from: DNA nanotechnology - Wikipedia, the free encyclopedia

DNA nanotechnology

DNA nanotechnology is a branch of nanotechnology which uses the unique molecular recognition properties of DNA and other nucleic acids to create designed, controllable structures out of DNA. This has possible applications in molecular self-assembly and in DNA computing. In this field, DNA is used as a structural material rather than as a carrier of genetic information, making it an example of bionanotechnology.

Clipped from: Hanadi Sleiman

Welcome to the Sleiman Research Group

Click here to read about our research
(link 1, link 2, link 3 )

Our research group focuses on developing the supramolecular chemistry of DNA, to address problems in both biology and nanoscience. We use this approach to design new materials for drug delivery, diagnostic tools, antitumor therapeutics, and higher-order DNA structures for the fine organization of materials on the nanometer scale.

Clipped from: All aboard the DNA nanotube

All aboard the DNA nanotube

Sleiman's nanotubes comprise triangular DNA 'rungs' in which the corner units are rigid organic molecules. These triangles are connected vertically using DNA strands, thus creating a nanotube structure with evenly spaced, alternating triangular 3D capsules of two different sizes (approximately 7nm and 14nm along one edge).
When the team assembled double stranded nanotubes in the presence of different sized gold nanoparticles, the particles became trapped inside their respective sized capsules like peas in a pod. 'In effect the nanotubes act like sieves, and select the correct sizes to encapsulate,' says Sleiman.

To release the cargo, the team added specific strands of DNA that are complementary to the DNA strands that close-in the particles. This causes the nanotubes to become single stranded, thus opening up the capsules and allowing the gold nanoparticles to escape.

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2009-12-14

Batteries of paper with nanotubes and nanowires

clipped from news.bbc.co.uk

Battery made of paper charges up

Batteries made from plain copier paper could make for future energy storage that is truly paper thin.

clipped from www.eetimes.com

Paper battery said to outperform lithium ion

PORTLAND, Ore. — A paper battery based on carbon nanotubes and silver nanowires could store an electric charge in a mobile device. Researchers also claim the new battery is disposable and that its shape could conform to the shape of different devices.

Bing Hu, a Stanford Univeristy post-doctoral fellow, applies special ink to ordinary paper, depositing nanotubes on the surface that can then be charged to create a battery.

clipped from www.stanford.edu

clipped from news.stanford.edu

At Stanford, nanotubes + ink + paper = instant battery

Dip an ordinary piece of paper into ink infused with carbon nanotubes and silver nanowires, and it turns into a battery or supercapacitor. Crumple the piece of paper, and it still works. Stanford researcher Yi Cui sees many uses for this new way of storing electricity.

clipped from www.stanford.edu

Nanomaterials Science and Engineering

7th of December 2009
Liangbing's paper on conductive paper battery and supercap was published in PNAS, and has been highlighted in the press, including in New York Times, Technology Review, Stanford Report, EE Times, and Scientific American.

clipped from www.youtube.com

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Carbon nanotubes

Carbon nanotubes are cylindrical carbon molecules with an exceptional length-to-diameter ratio. They have novel properties that make them potentially useful in many applications. including extraordinary strength, unique electrical properties and efficient heat conduction.

clipped from www.personal.rdg.ac.uk

Carbon nanotubes are molecular-scale tubes of graphitic carbon with outstanding properties. They are among the stiffest and strongest fibres known, and have remarkable electronic properties and many other unique characteristics. For these reasons they have attracted huge academic and industrial interest, with thousands of papers on nanotubes being published every year. Commercial applications have been rather slow to develop, however, primarily because of the high production costs of the best quality nanotubes.

Structure

The bonding in carbon nanotubes is sp², with each atom joined to three neighbours, as in graphite. The tubes can therefore be considered as rolled-up graphene sheets (graphene is an individual graphite layer). There are three distinct ways in which a graphene sheet can be rolled into a tube.

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