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Nano-Enabled Water Filter Brings Clean Water to Poor, Remote Regions

It seems that my criticisms of the Friends of the Earth’s (FoE) overly ideological report on nanotechnology’s role in improving our environment and enabling alternative energy are not alone. The reports continues to garner more sharp rebukes, like here  and here.

These are all well deserved criticisms in my opinion. To reinforce one of my own points that the FoE seemed to ignore, I bring you this story “Teabag filter cleans water with nanotechnology”.

Admittedly, inexpensive nano-enabled water filters are nothing new since Argonide Corporation has been around since 1994 offering more or less the same thing, but this current solution looks to be specifically targeted at providing clean drinking water to poor and remote regions of Africa.

"This project takes nanotechnology to the poorest of the poor people who live in this world, and it will make a difference in their lives," said Eugen Cloete, who in addition to inventing the filter is dean of the faculty of science at Stellenbosch University and chair of Stellenbosch University's Water Institute.

And anticipating the immediate knee-jerk reaction that this solution is probably more expensive than other methods of providing clean drinking water, Marelize Botes, who is analyzing the tea bags in her in her laboratory at the University of Stellenbosch in South Africa, said, "The filter is much cheaper than bottled water as well as any other filter on the market."

"It is simply impossible to build purification infrastructure at every polluted stream," Cloete said. "So we have to take the solution to the people. The water is cleaned right then and there when you drink from the bottle." 

Researchers from every imaginable scientific discipline looking for ways to apply nanotools and nanomaterials to every imaginable application, like clean drinking water, like clean energy, like energy conservation is not in itself a crime against the planet Earth. However, depriving the rest of us from these potential solutions may very well be.

Solution to Riddle in Fundamental Material Science Could Lead to New Age in Electronics

Researchers at Oregon State University (OSU) have reported success in creating a metal-insulator-metal (MIM) diode architecture that in the past has proven difficult to produce with high yield and top-level performance.

The research, which was initially published in the Wiley journal Advanced Materials, is being lauded as opening up a new approach to electronics.

"Researchers have been trying to do this for decades, until now without success," said Douglas Keszler, a distinguished professor of chemistry at OSU. "Diodes made previously with other approaches always had poor yield and performance.

"This is a fundamental change in the way you could produce electronic products, at high speed on a huge scale at very low cost, even less than with conventional methods," Keszler said. "It's a basic way to eliminate the current speed limitations of electrons that have to move through materials."

The OSU researchers found success in their MIM design over previous attempts through the use of an "amorphous metal contact" instead of a crystalline material.

The MIM architecture enables a quantum tunneling current flow through the insulator material, which is superior to traditional current flow that requires electrons to essentially jump across device barriers. This all translates to electronics that are faster, consume less energy and run cooler.

While this may be a diode architecture that can improve current speed of electrons that have to move through materials, it is not clear to some familiar with other MIM diode designs whether this will have much of an impact unless OSU has a working transistor (see comments).

Meanwhile the research, which was supported by National Science Foundation, the Army Research Laboratory and the Oregon Nanoscience and Microtechnologies Institute, is now seeking a patent.

NGO Challenges Use of Nanotechnology in Alternative Energy in New Report

I have long expressed my skepticism about the claims that nanotechnology would enable alternative energy solutions to compete with fossil fuels.

Now I have a companion in my challenge that I really should have expected, but still strikes me as somewhat ironic. Friends of the Earth has just released a new report (pdf) that not only argues that nanotechnology has not really delivered on its claims to be able to bring cheap solar, hydrogen and wind power to us, but also points out that the energy used in creating the nanomaterials that would enable these breakthroughs results in a net energy loss, and, of course, nanomaterials will kill us.

On balance, I have not agreed with the Friends of Earth (FoE) whether it be their tactics, their science or their politics. However, this is not to say they don’t make valid points that certainly deserve deeper investigation.

But they always end up becoming such vigorous advocates for their ultimate line of argument (big corporations and technological development is our enemy, or more accurately, the earth’s enemy) that they inevitably step over the line.

Andrew Maynard over at his 2020 Science blog takes a cursory look at the report with the tacit promise that he may come back to us with a more thorough reading of it later. But even in his quick reading of it he noticed the omission of “heterogeneous catalysts in vehicle exhausts” and “nanomaterials to develop more efficient power lines”.

From my reading of the executive summary, the FoE seems quite upset that nanomaterials are being used to improve the extraction of oil and gas. I suppose they see that as some kind of betrayal of the promise of nanotechnology, at least for use in promoting alternative energy.

The issue to me seems to be that the world is going to continue to extract oil, if nanomaterials can help in doing it more cheaply, efficiently and with the use of fewer resources, I would think that would be a good thing. But again, the FoE is so fervent in their ideologies that reducing the environmental impact of an industrial process is anathema because it perpetuates the use of the industrial process. Sigh.

I have wondered why the FoE exerts so much effort in combating the use of nanotechnologies when there are far more established and dangerous materials threatening them from afar. And I think I have an idea. Nanotechnology—or for that matter any emerging technology— that offers a solution to the world’s ills stands as an obstacle to their wish that we all live in mud huts and wear clothes from textiles we wove ourselves from sheep and cotton we raised ourselves, and on and on and on.

The irony of this is that this perspective can only come from highly affluent people who were raised and continue to live in a society built upon technological development that gives them clean drinking water, sanitary living conditions, and readily available calories for both food and energy. Meanwhile the billions who eat, sleep and live in what are virtually open sewers and who might like to have a cheap way of getting clean drinking water or someway to have electricity in their homes seem to be lost in the FoE’s self righteousness.

I welcome the FoE’s challenge to the real benefit of nanotechnology in alternative energy. However, my aim is to see that nanotechnology either actually rise up to its claims or admit that it cannot, not as the FoE seems to be doing wishing that it would all just go away.

Nanoribbons Break New Ground in Memory Storage Density

Researchers from Germany, Switzerland and Italy have demonstrated that turning graphene into nanoribbons using V2O5 nanofibers as etching masks not only dramatically improves their memory storage density over silicon-based chips but also surpasses carbon nanotubes and graphene in their transition times.

The research, which was initially published in the Wiley journalSmall, demonstrated that by depositing V2O5 nanofibers on top of graphene and then etching it with argon ion beam they were able to produce graphene nanoribbons that were less than 20 nm wide. This process also produced ribbons with smoother edges than are typically found with lithography techniques, resulting in devices made from them that have better performance characteristics.

The key to the nanoribbon’s memory storage density is that small memory cell. And according to Roman Sordan of the Politecnico di Milano, and one of the researchers on this project, that grapehene nanoribbons shrink these down to 10 nm scale.

“Indeed, the area of our new memory cell is so small that it allows for a very high storage density,” Sordan said in a story published by “We thus expect that graphene nanoribbon memory chips will allow Moore's law to continue for the foreseeable future.”

According to Sordan in the same article, the device produced from these graphene nanoribbons has a transition time three orders of magnitude shorter than those devices made from either carbon nanotubes or graphene.

In addition, Sordan believes the versatility of these memory cells will open differenct application areas. “They can be used as both static random access memories and nonvolatile flash memories cell for ultrahigh storage density applications,” he says in the article.

Now that memory has been addressed the researchers are going to look at how their nanoribbons can be applied to digital logic gates. “We have already made graphene logic gates but think that those made from nanoribbons will be better,” says Sordan.

IBM Goes for World Record in "Noise-Free" Labs

Nearly imperceptible changes for either man or machine in temperature, movement and noise can be catastrophic for executing accurate measurements on the nanoscale.

For this reason, IBM’s new Nanotechnology Center at its Zurich, Switzerland research campus has devoted approximately 10% of the new facility’s $60 million overall cost to constructing six rooms for different microscopy tools. Not only are the labs the most isolated from noise and movement of any other similar labs in the world, but have also gone beyond the capabilities of the most sensitive detection equipment currently available to detect either movement or noise.

This week I had the opportunity to tour IBM’s still unfinished Nanotechnology Center (they expect to have the facility operational by the first half of 2011) and get a look into their new “Noise-free”  labs , in which they are planning to get their first microscopy tool by the first quarter of 2011.

When deciding to go out for a record like the most “noise-free” lab in the world, they sure didn’t make it easy for themselves with the location. While the location does keep the Nanotechnology Center on the same campus of the research facility that IBM opened back in 1956, it is less than 200 meters from a heavy rail track and it would seem by my own estimates to be a good deal closer than that to a four-lane highway.

The benchmark for the IBM scientists who designed and engineered these labs from scratch was the NIST laboratories. Now the IBM researcher who was instrumental in the design, engineering and overseeing of the construction of these facilities, Dr. Emanuel Lörtscher, and who gave the assembled European journalists a presentation on the facilities, said that the NIST facilities they were informally competing against were located in a more remote location, making IBM's achievement all the more remarkable.

In any case, what the IBM team has accomplished is significant. Every conceivable detail was addressed. For instance, rather than simply using steel-reinforced concrete a special plastic was used as the rebar. 

As mentioned, the design and engineering of this facility was done in-house at IBM Zurich, and since one of the stated goals of IBM is to deliver an additional $20 billion in revenue by 2015 and bring its earnings per share to $20 by the same year from its current level of $10 EPS, I thought I would ask as an aside whether they were considering selling this developed design and engineering skill as a service, the response I got was, “We’re considering it.”

Federal Reserve Measures Impact of Nanotechnology on Electronics

The Federal Reserve, that extra-governmental entity that has run US monetary policy for the last century, has presented some fascinating interpretations of our economic circumstances in the recent past. The most glaring examples of this has been the idea put forth from its two most recent Chairman, Ben Bernanke and Alan Greenspan before him, that there was no housing bubble. Oops.

That’s why I found the most recent announcement from one of the twelve regional Federal Reserve Banks, in this case the one in Dallas, that it was going to be hosting a one-day seminar on how nanotechnology is going to impact electronics, somewhat disturbing. "Sizing Up Nanotechnology: The Economic Impact of Nanoelectronics" as its called will assemble experts from around the country to speak on December 3 in Texas and have them address:

  • What radical innovations might remove the circuit size constraints facing today’s semiconductor industry?
  • How will nanoelectronics drive productivity, output and export growth in the U.S.?
  • What conditions are needed for the industry to maximize its potential?

I think I have an inkling of what these talking points might mean, but I have to confess phrases like “remove the circuit size constraints” have me scratching my head. And I have to ask what “industry” are they referring to when they ask what conditions are needed for it to maximize its potential.

However, I really became confused when they proffered that “Nanoelectronics has the potential to replace the semiconductor.” I guess I just don’t know what they mean by “nanoelectronics”, or for that matter “semiconductor”.

But I am sure the assembled experts will clear this up. I just trust that they can avoid the reading of the economic tea leaves that led them to believe there was no housing bubble.

Is There a Connection between Nanotechnology and the So-Called Hydrogen Economy?

Nanotechnology has been held out as the missing element for making fuel cell use commonplace since the field first started to get news coverage outside of a select group of scientific journals.

I remember back to around 2001 when there was a real expectation that NEC would be offering commercially a fuel cell-powered laptop shortly. After a couple of years of getting “next year” as the status update, the story just faded away and it became clear that it wasn’t going to happen.

It may satisfy some to lay the blame for this failure to commercialize fuel cell-powered laptops at the feet of nanotechnology (in this case it was the use of nanohorns) but it is more likely the case that toting around a laptop through airport security with a half a liter of methanol attached to it wasn’t going to pass muster.

Then there was the hope that carbon nanotubes (CNTs) would be useful in storing hydrogen. There were supposedly some claims that CNTs had greater than 50wt% storage capacity but it is now generally accepted that the figure is closer to 1wt% in practicality.

Okay, nanohorn-based direct from methanol fuel cells just weren’t practical and CNTs just are not that great at hydrogen storage. But there are always catalysts, right? Huge surface area and small volume have always been appealing for improving catalysts, and the same is true for those catalysts used in fuel cells.

But improved catalysts hardly addresses the real problems for fuel cells. Let’s face it the stumbling blocks for fuel cells has been the cost of producing hydrogen and, especially in the case of portable fuel cells (like those used in an automobile), the lack of an infrastructure for supporting a so-called hydrogen economy.

With this as a backdrop, I saw a headline, “Nanotechnology and the Hydrogen Economy” so I had to check it out. I found the video I’ve posted below.

Oddly, there is no mention of how nanotechnology will enable a hydrogen economy, but nanotechnology and hydrogen economy are discussed independently.

We are given a definition of nanotechnology (thanks, we really don’t have enough of those) and we are told how one photon from the sun has just enough energy to split a water molecule into its constituent parts. How we are supposed to harness that energy for this purpose is discussed with a smile and the quip, “The energy is there we just have to figure out a way to use it.”

Yeah, I  guess so. What this has to do with nanotechnology would be of some passing interest. Maybe we can get that in the next video from its producers.  

Ice Lithography on the Nanoscale Moves Up a Notch in Complexity

Researchers at Harvard University are moving beyond patterning simple nanowires with ice lithography to creating more complex nanodevices.

The Harvard researchers, who are part of the Harvard Nanopore Group, including Daniel Branton and Anpan Han, published research back in 2005 that demonstrated that they could successfully execute nanometer-scale patterning with ice.

Now the researchers have reported in the November 1, 2010 online edition of Nano Letters that they can use ice lithography to produce nanodevices made from single-walled carbon nanotubes.

According to interviews for both Branton and Han in a Nanowerk article, the research provides a method for scaling up the applications for CNT-based nanodevices.

One of the ways in which the ice method provides scaling potential is by replacing atomic force microscopes (AFM) with scanning electron microscopes (SEM) in the mapping of the carbon nanotubes.

“Although not generally spelled out in publications, it is well known among the cognoscenti that nanotubes are contaminated or damaged by mapping their location in an electron microscope" Han is quoted as saying in the Nanowerk article. "To avoid contaminating or damaging, CNTs are often mapped by atomic force microscopes (AFM). But AFM is extremely slow. SEM mapping through ice is much faster and could be automated."

Ice lithography also eliminates a problem when using polymer-based resists, the resist residue affectionately known in the semiconductor industry as ‘scum’. While the scum is often less than one or two nanometers thick, that’s enough to obscure partially a carbon nanotube or to bosure completely a single layer for graphene. The process of getting rid of the scum (oxygen plasma) also manages to remove any carbon-based nanocomponents, according to Han. 

The ice lithography technique doesn’t leave any residue, which will likely improve the quality of the resulting nanodevices.

Now that the researchers have moved their research from patterning of simple nanowires to nanodevices, they see the next steps to be in the direction of making 3D nano- and graphene-based devices with this ice lithography technique. But the fundamental research into understanding the mechanisms behind ice lithography remains incomplete.

“Finally, we need to achieve a deeper understanding of the mechanisms behind ice lithography, about which we still know very little," says Branton.

National Nanotechnology Initiative Opens Its Strategy to Public Input

After the President’s Council of Advisors on Science and Technology (PCAST) presented earlier this year its 10-year review of the National Nanotechnology Initiative (NNI), and then shortly after that the White House sought the public’s input on the future strategy for nanotechnology development, it seems that the NNI itself is going to have a go itself at getting the public’s input on what it should be doing.

As of yesterday, November 1, the NNI is seeking public comment for thirty (30) days on its current draft of a strategic plan, which is accessible at the NNI Strategy Portal.

While I initially dismissed this idea of getting the public’s input on what the US nanotechnology strategy ought to be, I was soon turned around when I heard some of the highly informed, creative and comprehensive ideas that were collected by PCAST. Of course, once these serious ideas were presented, the PCAST chairperson then summarily dismissed them, instead seeking some quick and easy answers. But nonetheless as long as there are serious ideas out there, and some serious people listening, it couldn’t hurt.

I suppose the NNI has been a viable target for critics over the years, primarily for its less than overwhelming attention to the environmental, health and safety (EHS) concerns surrounding nanotechnology. An issue for which the NNI has been trying to address with a 300% increase in EHS funding from 2006 to its latest request for 2011.

But despite this the NNI remains a benchmark for nearly every government-led nanotechnology initiative that has sprouted up since (in 2007 the estimate ran to 35 of countries announcing nanotechnology programs) and rightly so I would argue.

While some governments have laid claim to have first set aside government funding for nanotechnology research, they haven’t really distinguished themselves since with a particularly well-run programs.

Now that it appears the US nanotech strategy will place an increasing emphasis on developing applications from the basic nanotechnology research that has been funded over the past 10 years, and give more attention to the EHS concerns that may arise from these commercial applications, I think the NNI is more or less on the right track and maybe some helpful input from the public could sand the edges. We’ll see.

Steep Slope Transistors Provide Benefit of Longer Battery Life for Mobile Phones

On Wednesday I covered the announcement from Ecole Polytechnique Fédérale de Lausanne (EPFL) and IBM that they along with host of other European research institutes were intending to develop better transistors that would eliminate the wasted current that drips through transistor gates.

The project has been dubbed Steeper based on its intentions to create steep slope transistors that exhibit an abrupt change when switching between on and off states.

I focused primarily on its addressing of the issue of vampire energy consumption and how this project could account for much greater energy conservation.

Oddly, considering my recent preoccupation with improving mobile phone batteries and rechargeable batteries in general, I neglected to point out that one of the side benefits of conserving power in electronic devices is that the batteries will last longer. This was pointed out to me in a flurry of tweets on Twitter claiming “Cellphone Battery Life to Improve 10x Thanks to Nanotechnology”.

In my defense for not pointing this out in my original blog entry, I should note that the technology will not improve battery technology, but just improve the electronic devices that the batteries are charging so that they use less energy and drain less power from the batteries.



IEEE Spectrum’s nanotechnology blog, featuring news and analysis about the development, applications, and future of science and technology at the nanoscale.

Dexter Johnson
Madrid, Spain
Rachel Courtland
Associate Editor, IEEE Spectrum
New York, NY
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