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Carbon nanotubes can double growth of cell cultures important in industry

April 5, 2012

Diagram showing the complex effects that multiwalled carbon nanotubes (MWCNTs) can induce at the cellular and molecular levels in living organisms. Interaction of plant cells with MWCNTs can lead to significant changes at the molecular level and affect the expression of specific genes and the production of proteins responsible for a particular phenotype (credit: ACS Nano)

A dose of carbon nanotubes more than doubles the growth rate of plant cell cultures — workhorses in the production of everything from lifesaving medications to sweeteners to dyes and perfumes — researchers at the University of Arkansas report.

Their study is the first to show that carbon nanotubes boost plant cell division and growth.

Their previous research demonstrated that multiwalled carbon nanotubes (MWCNTs) can penetrate through the thick… read more

Carbon nanotubes broken down by white blood cells

April 6, 2010

A team of Swedish and American scientists has shown for the first time that carbon nanotubes can be broken into water and carbon dioxide by an enzyme — myeloperoxidase (MPO) — found in white blood cells.

This enzyme is expressed in certain types of white blood cell (neutrophils), which use it to neutralize harmful bacteria.

Carbon nanotubes were once considered biopersistent and potentially toxic.

“This means that… read more

Carbon Nanotubes Boost Cancer-Fighting Cells

April 21, 2010

Carbon Nanotubes

Yale University engineers have found that defects in carbon nanotubes cause T cell antigens to cluster in the blood and stimulate the body’s natural immune response in one third the time normally required.

Carbon nanotubes as reinforcing bars to strengthen graphene and increase conductivity

Could substitute for expensive indium tin oxide in displays and solar cells, making them unbreakable
April 9, 2014

nanotube_rebars

Rice University chemists have created a new material that adds carbon nanotubes as reinforcing bars (“rebar”) — mimicking how steel rebar is used in concrete — to make it easier to manipulate, while improving the electrical and mechanical qualities of both materials.

The technique should be of interest to electronics manufacturers, said Rice chemist James Tour. He suggested that by stacking a few layers, the… read more

Carbon nanotubes + photoluminescent supramolecules -> new catalysts

July 13, 2011

Supra Molecule

Chemists at Rice University have created a platform to analyze interactions between carbon nanotubes and a wide range of photoluminescent materials.

The microscopic particles combine single-walled carbon nanotubes with porous silicate materials that can absorb various molecules such as a photoactive ruthenium complex. The research involved dissolving the bundles in chlorosulfonic acid, which added protons (a positive charge) to each nanotube. This made the nanotubes attractive… read more

Carbon nanotube/buckyball-based solar cell harnesses infrared light

New type of photovoltaic device harnesses near-infrared radiation, which most solar cells ignore
June 22, 2012

Carbon Solar

new kind of all-carbon solar cell developed by MIT researchers could tap into unused near-infrared energy, opening up the possibility of combination solar cells — incorporating both traditional silicon-based cells and the new all-carbon cells — that could make use of almost the entire range of sunlight’s energy.

“It’s a fundamentally new kind of photovoltaic cell,” says Michael Strano, the Charles and Hilda Roddey Professor of Chemical… read more

Carbon nanotube-based ultra-low voltage integrated circuits may extend Moore’s law

June 24, 2012

Carbon nanotube-based integrated circuits can work with a supply voltage much lower than that used in conventional silicon integrated circuits, researchers from Peking University and Duke University have demonstrated

Low supply voltage circuits produce less heat, a key limiting factor for increased circuit density. So carbon-nanotube integrated circuits promise to extend Moore’s Law by allowing more transistors to fit onto a single chip without overheating.

Carbon nanotube transistors orders of magnitude better at spotting cancer, say bioengineers

February 21, 2013

detecting_prostate_cancer

Mitchell Lerner at the University of Pennsylvania and associates have revealed a technique that uses an array of carbon nanotube transistors on a silicon chip to detect a biomarker of prostate cancer known as osteopontin (OPN), The Physics arXiv Blog reports.

The transistor can detect OPN at concentrations of 1 picogram per milliliter — a concentration three orders of magnitude weaker than ELISA can manage. ELISA is the… read more

Carbon nanotube technology, closer than you think

August 26, 2005

Scientists are looking at using the highly conductive properties of carbon nanotubes to dissipate heat from computer chips, which would allow them to run faster without overheating.

Carbon nanotube surface could help regenerate cartilage

June 5, 2008

Purdue University and Brown University nanotechnology researchers have found a way to regenerate cartilage naturally by creating a rough carbon nanotube surface that attracts cartilage-forming cells. Electrical pulses applied to the cells then encouraged them to grow.

Current methods to help with lost cartilage involve injections of a synthetic gel, which is temporary, so injections have to be repeated.

Brown University News Release

Carbon nanotube sheets create invisibility

November 14, 2011

Dr. Ali Aliev, a research scientist at UT Dallas, and colleagues have demonstrated that transparent carbon nanotube sheets can be used to make objects invisible.

This invisibility for light oblique to the nanotube sheets is caused by the mirage effect (photothermal deflection), in which a thermally generated refractive index gradient bends light array from a hidden object.

“The remarkable performance of nanotube sheets suggests… read more

Carbon nanotube sensor detects glucose in saliva

May 3, 2013

glucose_binding_nanotube

Painful finger-prick blood tests for diabetics could become a thing of the past, say physicists who have built a sensor that measures glucose in saliva.

Mitchell Lerner at the University of Pennsylvania and associates have developed just such a device, MIT Technology Review reports. Their glucose sensor is essentially a carbon nanotube-based transistor in which the nanotubes are coated with pyrene-1-boronic acid molecules that bind to glucose.… read more

Carbon nanotube rubber could provide e-skin for robots

August 13, 2008

University of Tokyo researchers have developed a stretchable conductive material that combines the properties of metal and rubber.

The material is made by grinding carbon nanotubes with an ionic liquid and adding it to rubber. It could be made into large rollable sheets and mounted on curved surfaces.

Possible uses include elastic integrated circuits, a sensor skin for robots, a flexible display, biomedical monitoring, and soft interfaces between… read more

Carbon nanotube integrated circuit developed

April 3, 2001

A carbon nanotube integrated circuit, with a thousand nanotubes acting like transistors, has been devised by IBM, as reported in Physics News.

Besides their small size, nanotubes are strong and can withstand high current densities and heat, allowing for high packing density.

Carbon nanotube ‘ink’ may lead to thinner, lighter transistors and solar cells

January 9, 2009

sientists at Cornell and DuPont have invented a method of preparing carbon nanotubes for suspension in a semiconducting “ink,” which can then be printed into such thin, flexible electronics as transistors and photovoltaic materials.

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