Great things from small things

Osmotic Power 72516 img_0688

Harvesting renewable ‘blue energy’ from salt concentration gradients, such as those that occur at river mouths where fresh water mixes with salty sea water, just got a boost. An osmotic nanogenerator made from atom thick molybdenum disulfide (MoS2) has been created that can turn much more of this chemical energy into electricity than ever before.1

The molybdenum disulfide nanopore membrane (blue and yellow) uses salinity gradients to generate electricity © Nature Publishing Group

With the potential to be a considerable source of energy, osmotic power has gained ground in recent years with several pilot power plants around the world. 

It’s estimated that a total of around two terawatts of clean energy – the equivalent of around 2000 nuclear reactors – could be harvested worldwide from locations where salt concentration gradients occur.
Two main membrane technologies exist to harness osmotic power from solutions with differing salt concentrations. One is pressure retarded osmosis (PRO) which uses membranes to exploit pressure differences and drive a turbine, while the other is called reverse electrodialysis (RED) which involves ion exchange across a charged membrane. However, both methods have been limited by the efficiency and power density of materials that have only been able to generate a few watts per square metre of membrane.

However, the world’s first prototype PRO osmotic power plant, which was opened by Statkraft in Norway in 2009, was deemed uneconomical and shelved in 2013.
Better materials have been developed though, including boron nitride nanotubes which French researchers showed could produce 1000 watts per square meter in 2013, leading to a patent and a spin-off.

Now, Swiss and US researchers have discovered something even better – a MoS2 membrane punctured with pores that has an estimated power generation two to three orders of magnitude greater than boron nitride nanotubes, and could be as much as a million times greater than traditional RED osmotic power membranes.
Positive power

‘This is the thinnest membrane for this purpose,’ explains Jiandong Feng who led the work at the Swiss Federal Institute of Technology at Lausanne (EPFL). ‘As transport through a membrane scales inversely with membrane thickness, our single layer MoS2 nanopore, produced substantial power density.’


Feng’s team used transmission electron microscopy to drill 5nm wide pores into their MOS2 sheets © Nature Publishing Group

The new RED-based osmotic nanogenerator has a 0.65nm thick MoS2 membrane with a single nanopore that separates two reservoirs containing potassium chloride solutions of different concentrations.

A chemical potential gradient forms at the pore where the two solutions can mix and this drives potassium and chloride ions over the pore. Since the pore’s surface is negatively charged, it acts as a screen to usher through many more positive than negative ions which produces a current.

The team showed off the nanogenerator’s capabilities by connecting two sheets together to power a MoS2 transistor. Although the team only demonstrated this small scale application, Feng says the nanogenerators have potential for scaling up for sea water power generation.
‘This shows that new materials, with a diverted use from nanoelectronics towards fluid transport, can make a breakthrough in this field,’ comments Lydéric Bocquet at France’s National Center for Scientific Research in Paris who was behind the boron nitride nanotube research.2

However, he suggests that making metre square MoS2 membranes, which to his knowledge has never been achieved, could limit large-scale power production. But he adds it is still worth a try.
Even if it’s possible to make large MoS2 sheets, this natural power source may still be out of reach, suggests Ngai Yin Yip who studies membrane technologies at Columbia University in New York, US. ‘

There are other practical and technical obstacles in accessing the energy of natural salinity gradients on a large scale, such as the presence of naturally-occurring foulants in river water and seawater clogging up nanopores,’ he explains.
However, both Bocquet and Yip think the nanogenerators could find use in low energy, small-scale niche applications. ‘If the system can be further developed to draw from two separate reservoirs of different salinity with minimal energy consumption using innovative techniques, the nanogenarator system can be perpetually self-powered,’ says Yip. ‘These nanogenerators could be deployed in remote locations without having to be recharged or have batteries replaced, to power devices such as nanosensors.”

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Nanoscience is one of the fastest growing and most impactful fields in global scientific research. In order to support the continued development of nanoscience and nanotechnology, it is important that nanoscience education be a top priority to accelerate research excellence. In this Nano Focus, we discuss current approaches to nanoscience training and propose a learning design framework to promote the next generation of nanoscientists. Prominent among these are the abilities to communicate and to work across and between conventional disciplines. While the United States has played leading roles in initiating these developments, the global landscape of nanoscience calls for worldwide attention to this educational need. Recent developments in emerging nanoscience nations are also discussed. Photo credit: Jae Hyeon Park.

Education has long been recognized as an important factor for growing the fields of nanoscience and nanotechnology and solidifying and expanding their roles in the global economy. In many countries, there is growing interest in developing educational programs across the full spectrum of educational levels from K-12 to postgraduate studies.

Various formal and informal educational practices are being designed and tested that promote general awareness of nanoscience and nanotechnology as well as provide advanced learning and skills development, including through group learning and peer assessment”In their article, the authors discuss innovative learning models that are being applied at the undergraduate level in order to train future leaders at the interface of engineering and management.

students running nanoscience experiments

Middle and high school students spend time at the California NanoSystems Institute at UCLA running nanoscience experiments. High school teachers from over 100 schools and 30 school districts are trained, networked to one another, and supplied with kits for their classrooms. Graduate students, postdocs, faculty, and staff run, expand, and improve these fully subscribed outreach events on a continuous basis. (© American Chemical Society)

While thee programs are not strictly focused on nanotechnology, many graduates pursue nanotechnology-focused careers and they provide examples of important factors that should be considered in the nanotechnology field.Moreover, they represent the growing trend of holistic learning, which integrates coursework across disciplines, promotes foreign experiences, and encourages industrial internships.

Here is the set of recommendations they make:

Inspire Students To Envision What Is or Could Be Possible

Possibilities include a greater focus on nanotechnology applications in courses or hands-on laboratory experiences that tie in with class concepts. Even before reaching the classroom, students should have positive views of nanoscience and the potential it holds. Successful learning practices start with capturing the imagination of students. Communicating the remarkable features of nanoscience in a simple and clear way to the mainstream public would go a long way toward achieving this goal.

Promote Role Models Who Impact Society

From an educational perspective, the tech world is a particularly good example because successful entrepreneurs such as Steve Jobs, Elon Musk, Sheryl Sandberg, and Mark Zuckerberg have captured the public audience and inspired countless students to think beyond the classroom. In nanotechnology, similar role models can inspire students with the many opportunities available in the field.

Encourage Global Collaboration

Nanotechnology research and development is truly global. Early exposure to these trends will better inform students about career opportunities and give them ideas about how to work together in teams across disciplines and cultures. A growing number of partnerships already provide international experiences for nanoscience and nanotechnology students.

Support Early Exposure Inside and Outside of the Laboratory

For many students, nanoscience and nanotechnology are about working in a lab doing scientific research. While this activity is common, its generalization could not be farther from the truth. There are many possible ways to get involved in nanotechnology, from instructional education and hands-on training to entrepreneurship and manufacturing.Holistic approaches that integrate these different possibilities, while providing targeted career development, would greatly benefit students and the overall goals of nanotechnology education. Developing a strong workforce infrastructure for nanotechnology

Communication Across Fields

Stressing the importance of communication, the authors conclude:

“Finally, one of the great strengths of the nanoscience and nanotechnology communities is that we have taught each other how to communicate across fields, to look at and to leverage each other’s approaches, and to address the key issues of a multitude of fields.

As a field, we are increasingly viewed as problem solvers in science and technology, developing new tools, materials, methods, and opportunities. Bringing this aspect of our field to students (and scientists and engineers at all levels) will have significant impact on the world around us and our ability to make it better.”

By Michael Berger. © Nanowerk

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Nano Body II 43a262816377a448922f9811e069be13Author: Tilda Barliya PhD

Peripheral nerve lacerations are common injuries and often cause long lasting disability (1a) due to pain, paralyzed muscles and loss of adequate sensory feedback from the nerve receptors in the target organs such as skin, joints and muscles (1b).

 

Nerve injuries are common and typically affect young adults with the majority of injuries occur from trauma or complication of surgery. Traumatic injuries can occur due to stretch, crush, laceration (sharps or bone fragments), and ischemia, and are more frequent in wartime, i.e., blast exposure. Domestic or occupational accidents with glass, knifes of machinery may also occur.

Statistics show that peripheral nervous system (PNS) injuries were 87% from trauma and 12% due to surgery (one-third tumor related, two-thirds non– tumor related). Nerve injuries occurred 81% of the  time in theupper extremities and 11% in the lower extremities, with the balance in other locations (4).

Injury to the PNS can range from severe, leading to major loss of function or intractable neuropathic pain, to mild, with some sensory and/or motor deficits affecting quality of life.

Functional recovery after nerve injury involves a complex series of steps, each of which may delay or impair the regenerative process. In cases involving any degree of nerve injury, it is useful initially to categorize these regenerative steps anatomically on a gross level. The sequence of regeneration may be divided into anatomical zones (4):

  1. the neuronal cell body
  2. the segment between the cell body and the injury site
  3. the injury site itself
  4. the distal segment between the injury site and the end organ
  5. the end organ itself

A delay in regeneration or unsuccessful regeneration may be attributed to pathological changes that impede normal reparative processes at one or more of these zones.

Nanotechnology-for-Regenerating-Nerves-2

Repairing nerve defects with large gaps remains one of the most operative challenges for surgeons. Incomplete recovery from peripheral nerve injuries can produce a diversity of negative outcomes, including numbness, impairment of sensory or motor function, possibility of developing chronic pain, and devastating permanent disability.

In the past few years several techniques have been used to try and repair nerve defects and include:

  • Coaptation
  • Nerve autograph
  • Biological or polymeric nerve conduits (hollow nerve guidance conduits)

For example, When a direct repair of the two nerve ends is not possible, synthetic or biological nerve conduits are typically used for small nerve gaps of 1 cm or less. For extensive nerve damage over a few centimeters in length, the nerve autograft is the “gold standard” technique. The biggest challenges, however, are the limited number and length of available donor nerves, the additional surgery associated with donor site morbidity, and the few effective nerve graft alternatives.

Degeneration of the axonal segment in the distal nerve is an inevitable consequence of disconnection, yet the distal nerve support structure as well as the final target must maintain efficacy to guide and facilitate appropriate axonal regeneration. There is currently no clinical practice targeted at maintaining fidelity of the distal pathway/target, and only a small number of researchers are investigating ways to preserve the distal nerve segment, such as the use of electrical stimulation or localized drug delivery. Thus development of tissue-engineered nerve graft may be a better matched alternative (6,7).

The guidance conduit serves several important roles for nerve regeneration such as: a) directing axonal sprouting from the regenerating nerve b) protecting the regenerating nerve by restricting the infiltration of fibrous tissue c) providing a pathway for diffusion of neurotropic and neurotophic factors

Early guidance conduits were primarily made of silicone due to its stability under physiological conditions, biocompatibility, flexibility as well as ease of processing into tubular structures. Although silicone  conduits have proven reasonably successful as conduits for small gap lengths in animal models (<5 mm). The non-biodegradability of silicone conduits has limited its application as a strategy for long-term repair and recovery. Tubes also eventually become encapsulated with fibrous tissue, which leads to nerve compression, requiring additional surgical intervention to remove the tube.Another limiting factor with inert guidance conduits is that they provide little or no nerve regeneration for gap lengths over 10 mm in the PNS unless exogenous growth factors are used (6,7).

In animal studies, biodegradable nerve guidance conduits have provided a feasible alternative, preventing neuroma formation and infiltration of fibrous tissue. Biodegradable conduits have been fabricated from natural or synthetic materials such as collagen, chitosan and poly-L-lactic acid.

Nanostructured Scaffolds for Neural Tissue Engineering: Fabrication and Design

At the micro- and nanoscale, cells of the CNS/PNS reside within functional microenvironments consisting of physical structures including pores, ridges, and fibers that make up the extracellular matrix (ECM) and plasma membrane cell surfaces of closely apposed neighboring cells. Cell-cell and cell-matrix interactions contribute to the formation and function of this architecture, dictating signaling and maintenance roles in the adult tissue, based on a complex synergy between biophysical (e.g. contact-mediated signaling, synapse control), and biochemical factors (e.g. nutrient support and inflammatory protection). Neural tissue engineering scaffolds are aimed toward recapitulating some of the 3D biological signaling that is known to be involved in the maintenance of the PNS and CNS and to facilitate proliferation, migration and potentially differentiation during tissue repair.

Nanotechnology and tissue engineering are based on two main approaches:

  • Electrospinning (top-down) – involves the production of a polymer filament using an electrostatic force. Electrospinning is a versatile technique that enables production of polymer fibers with diameters ranging from a few microns to tens of nanometers.
  • Molecular self-assembly of peptides (bottom-up) – Molecular self-assembly is mediated by weak, non-covalent bonds, such as van der Waals forces, hydrogen bonds, ionic bonds, and hydrophobic interactions. Although these bonds are relatively weak, collectively they play a major role in the conformation of biological molecules found in nature.

Pfister et al (6) very nicely summarized the various polymeric fibers been used to achieve the goal of nerve regeneration, even in humans. These material include a wide array of polymers from silica to PLGA/PEG and Diblock copolypeptides.

Many of these approaches also enlist many trophic factors that have been investigated in nerve conduits

Currently there are three general biomaterial approaches for local factor delivery:

  1. Incorporation of factors into a conduit filler such as a hydrogel
  2. Designing a drug release system from the conduit biomaterial such as microspheres
  3. Immobilizing factors on the scaffold that are sensed in place or liberated upon matrix degradation.

Maeda et al had a  creative approach to bridge larger gaps by using the combination of nerve grafts and open conduits in an alternating “stepping stone” assembly, which may perform better than an empty conduit alone (8).

Summary

Peripheral nerve repair is a growing field with substantial progress being made in more effective repairs. Nanotechnology and biomedical engineering have made significant contributions; from surgical instrumentation to the development of tissue engineered grafting substitutes.  However, to date the field of neural tissue engineering has not progressed much past the conduit bridging of small gaps and has not come close to matching the autograf. Much more studies are needed to understand the cell behaviour that can promote cell survival, neurite outgrowth, appropriate re-innervation and consequently the functional recovery post PNS/CNS injuries. This is since understanding of the cellular response to the combination of these external cues within 3D architectures is limited at this stage.

 

Ref:

1a. Jaquet JB, Luijsterburg AJ, Kalmijn S, Kuypers PD, Hofman A, Hovius SE.  Median, ulnar, and combined median-ulnar nerve injuries:functional outcome and return to productivity. J Trauma 2001 51: 687-692.http://www.ncbi.nlm.nih.gov/pubmed/11586160

1b. Lundborg G, Rosen B. Hand function after nerve repair. Acta Physiol (Oxf) 2007 189: 207-217. http://www.ncbi.nlm.nih.gov/pubmed/17250571

1. Chang WC., Kliot M and Stretavan DW. Microtechnology and Nanotechnology in Nerve Repair. Neurological Research 2008; vol 30: 1053-1062. http://vision.ucsf.edu/sretavan/sretavanpdfs/2008b-Chang%20&%20Sretavan.pdf

2. Biazar E., Khorasani MT and Zaeifi D. Nanotechnology for peripheral nerve regeneration. Int. J. Nano. Dim. 2010 1(1): 1-23. http://www.ijnd.ir/doc/2010-v1-i1/2010-V1-I1-1.pdf

3. Albert Aguayo. Nerve regeneration revisited. Nature Reviews Neuroscience 7, 601 (August 2006).

http://www.nature.com/nrn/journal/v7/n8/full/nrn1974.html

4. Burnett MG and  Zager EL. Pathophysiology of Peripheral Nerve Injury: A Brief Review. Neurosurg Focus. 2004;16(5) .

http://www.medscape.com/viewarticle/480071_5

5. Dag Welin. Neuroprotection and axonal regeneration after peripheral nerve injury. MEDICAL DISSERTATIONS

Welin, D., Novikova, L.N., Wiberg, M., Kellerth, J-O. and Novikov, L.N. Survival and regeneration of cutaneous and muscular afferent neurons after peripheral nerve injury in adult rats. Experimental Brain Research, 186, 315-323, 2008.

http://link.springer.com/article/10.1007%2Fs00221-007-1232-5

6. Pfister BJ., Gordon T., Loverde JR., Kochar AS., Mackinnon SE and Cullen Dk. Biomedical Engineering Strategies for Peripheral Nerve Repair: Surgical Applications, State of the Art, and Future Challenges. Critical Reviews™ in Biomedical Engineering 2011, 39(2):81–124.http://www.med.upenn.edu/cullenlab/user_documents/2011Pfisteretal-PNIReviewArticleCritRevBME.pdf

7. Zhou K, Nisbet D, Thouas G,  Bernard C and Forsythe J. Bio-nanotechnology Approaches to Neural Tissue Engineering. Intechopen. Com. http://cdn.intechopen.com/pdfs/9811/InTech-Bio_nanotechnology_approaches_to_neural_tissue_engineering.pdf

8. Maeda T, Mackinnon SE, Best TJ, Evans PJ, Hunter DA, Midha RT. Regeneration across ’stepping-stone’ nerve grafts. Brain Res. 1993;618(2):196–202. http://www.ncbi.nlm.nih.gov/pubmed/?term=Maeda+T+and+regeneration+across+stepping+stone

A cross-disciplinary team at Harvard University has created a system that uses solar energy to split water molecules and hydrogen-eating bacteria to produce liquid fuels. The system can convert solar energy to biomass with 10 percent efficiency, far above the one percent seen in the fastest-growing plants.

 

The bionic leaf is one step closer to reality.

Daniel Nocera, a professor of energy science at Harvard who pioneered the use of artificial photosynthesis, says that he and his colleague Pamela Silver have devised a system that completes the process of making liquid fuel from sunlight, carbon dioxide, and water. And they’ve done it at an efficiency of 10 percent, using pure carbon dioxide—in other words, one-tenth of the energy in sunlight is captured and turned into fuel.

That is much higher than natural photosynthesis, which converts about 1 percent of solar energy into the carbohydrates used by plants, and it could be a milestone in the shift away from fossil fuels. The new system is described in a new paper in Science.

 

“Bill Gates has said that to solve our energy problems, someday we need to do what photosynthesis does, and that someday we might be able to do it even more efficiently than plants,” says Nocera. “That someday has arrived.”Artificial Photosynth ext

 
In nature, plants use sunlight to make carbohydrates from carbon dioxide and water. Artificial photosynthesis seeks to use the same inputs—solar energy, water, and carbon dioxide—to produce energy-dense liquid fuels. Nocera and Silver’s system uses a pair of catalysts to split water into oxygen and hydrogen, and feeds the hydrogen to bacteria along with carbon dioxide.

The bacteria, a microörganism that has been bioengineered to specific characteristics, converts the carbon dioxide and hydrogen into liquid fuels.

 

Several companies, including Joule Unlimited and LanzaTech, are working to produce biofuels from carbon dioxide and hydrogen, but they use bacteria that consume carbon monoxide or carbon dioxide, rather than hydrogen. Nocera’s system, he says, can operate at lower temperatures, higher efficiency, and lower costs.

 

Nocera’s latest work “is really quite amazing,” says Peidong Yang of the University of California, Berkeley. Yang has developed a similar system with much lower efficiency. “The high performance of this system is unparalleled” in any other artificial photosynthesis system reported to date, he says.

 

The new system can use pure carbon dioxide in gas form, or carbon dioxide captured from the air—which means it could be carbon-neutral, introducing no additional greenhouse gases into the atmosphere. “The 10 percent number, that’s using pure CO2,” says Nocera. Allowing the bacteria themselves to capture carbon dioxide from the air, he adds, results in an efficiency of 3 to 4 percent—still significantly higher than natural photosynthesis.

“That’s the power of biology: these bioörganisms have natural CO2 concentration mechanisms.”

 

Nocera’s research is distinct from the work being carried out by the Joint Center for Artificial Photosynthesis, a U.S. Department of Energy-funded program that seeks to use inorganic catalysts, rather than bacteria, to convert hydrogen and carbon dioxide to liquid fuel.

 

According to Dick Co, who heads the Solar Fuels Institute at Northwestern University, the innovation of the new system lies not only in its superior performance but also in its fusing of two usually separate fields: inorganic chemistry (to split water) and biology (to convert hydrogen and carbon dioxide into fuel). “What’s really exciting is the hybrid approach” to artificial photosynthesis, says Co. “It’s exciting to see chemists pairing with biologists to advance the field.”

Commercializing the technology will likely take years. In any case, the prospect of turning sunlight into liquid fuel suddenly looks a lot closer.

Operator in factory use microscope

Operator in factory use microscope

Nanotube Surface Technology

The nanotube surface treatment evolved from solar panel research by various groups and biomaterials research by Sungho Jin, PhD at the University of California San Diego (UCSD). Others, including Amit Bandyopadhyay, PhD and collaborating researchers at Washington State University (WSU), and Masa Ishigami, PhD’s team at the University of Central Florida (UCF), have helped to enhance the technology. Established companies specializing in medical implant surface treatments have helped to scale and commercialize the technology.It is hard to imagine just how tiny nanotubes are compared to traditional implant surface structures. They are thousands of times smaller than traditional porous structures on implants or even cells. Millions of nanotubes form a surface texture and energy that interacts with the outer membrane of a cell wall. These arrays of millions of nanotubes per square millimeter can be formed onto flat or porous structures.

Nanotubes are not an additive coating. They are formed into the existing metal oxide tissue-contacting surface of implants. Titanium, tantalum, and zirconium metals and alloy implants are directly treated with an anodization process to form the nanotubes. Implants made from other materials such as PEEK, medical polymers, ceramics and CoCrMo are indirectly treated by first applying a thin layer of titanium that is then processed by a similar patented anodization technique to form nanotubes on its surface.

Any implant surface that requires stable fixation against bone such as a hip, knee, ankle, shoulder, hand, or spinal implant can be enhanced by nanotubes.

How does it work?

  • It mimics the stem cells around the implant into thinking that the surface of the implant is actually another cell.
  • The super-absorbent, ultra-hydrophilic surface enhances tissue cell attachment.
  • The cell then spreads and branches out on the implant surface.
  • The stem cell differentiates to match the cells that are around the nanotube surface.
  • If around bone cells, Osteoblasts form and the mineralization process begins.
  • If near cartilage, chondrocyte cells form starting cartilage regeneration

Testing

“In Vivo studies have shown that titanium implants that have nanotubes on them have a nine times greater osseointegration bond strength as compared to implants that don’t. We also see faster cell differentiation—the bonding happens weeks faster than it would without nanotubes. We’re interested in allowing patients to walk on or fully use their implants faster. We’re trying to speed that up not by days, but by weeks and perhaps months”

Sungho Jin, PhD

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