Nanoparticles: small but not banal

Galarraga Aiestaran, Ana

Elhuyar Zientzia

Researchers expect nanotechnology to have many benefits. However, this new technology not only generates hope, but also concern. In fact, they suspect that nanoparticles can cause damage to the environment and health. To know what these damages are and how they can be avoided, the United States and the European Union, among others, are conducting in-depth research. The precautionary principle prescribes until final results.
Nanoparticles: small but not banal
01/05/2008 | Galarraga Aiestaran, Ana | Elhuyar Zientzia Komunikazioa

(Photo: Archive)
The news is unknown and often the unknown generates fear or suspicion. This is something that often happens in new technologies: from the start of using technology to the fact that it has benefits and does not cause damage, people do not completely reject suspicions.

For example, genetically modified organisms, which have been produced for a long time and are increasingly consumed, continue to generate a contrary position in much of society. Now it seems that products made with nanotechnology can have a similar response. This is evidenced by, for example, the competition held in 2006 by the ETC Group and the press releases published earlier this year by the British entity Soil Association or Lurra.

The ETC Group is a Canadian environmental association that for two years has launched a competition to create a special label for products with nanoparticles. It was quite successful: in a few months they received almost five hundred proposals.

Soil Association is a British association. He is in favor of organic foods and in a press release stating that they do not use or use nanotechnologies in their products. Moreover, the first organization that does not accept nanoparticles.

Nanotechnology products are worrying for ETC and Soil Association. Above, two designs were presented to the contest organized by the ETC to create the identification tag of these products. Below, an initiative of the Soil Association. This association does not support nanoparticles.
Superior: ETC; Lower: Soil Association

According to them, there are still few studies on the influence of nanoparticles on living organisms, so it is better not to use them until the results are clear. In addition, they have denounced the British government for not taking measures against products generated by nanotechnology and for putting commercial interests above the health of citizens.

However, the British government has spent years researching the effects of nanoparticles and in 2004 requested their non-use until their consequences were clarified. However, they do not have specific regulations. However, this is not only happening in Britain, but throughout the European Union and the United States, among other things, we are working to solve the problem.

And steps are already being taken: In February, the US government published its strategy to investigate the effects of nanotechnology on environmental, health and safety issues. On the other hand, the European Union has developed a code of conduct for the responsible use of nanotechnology, which has asked member states to convert this voluntary code into a regulation. Among his proposals in the code it is mentioned that nanoscience must be safe and ethical and meet the best standards of science.

In addition, the food security organization in the European Union, EFSA, is preparing a report on the risks of nanotechnology in food and food, in collaboration with scientists working in this field. The interim report is expected to leave in July and the final in autumn.

The characteristics of nanoparticles and those of the same materials in large dimensions can be very different.
H. University of Zhang/California
Behind these proposals, codes and reports there is a work of years. In fact, as nanotechnology has been developed, more and more in-depth studies have been conducted to analyze the possible adverse effects of nanoparticles. The ultimate goal is to ensure safety.

Small and different

It cannot be denied that certain nanotechnology products can pose a risk to health and the environment. Nanoparticles have 100 nanometers or less (viruses measure between 50 and 100 nanometers; proteins between 2 and 8 nanometers) and can present very different characteristics than those of a substance to a greater extent. Nanotechnology is used to create new products and applications. But they also run the risk of causing damage, both due to their characteristics and size.

Free nanoparticles are particularly concerned. Igor Campillo, director of development and communication at CIC nanoGUNE, tells us that nanostructures that are part of a large object are not dangerous, at least more dangerous than conventional materials. In any case, they can reach their environment after use if not treated properly. Free nanoparticles, even those found in clusters, are easily accessible to the environment and can penetrate living organisms. Several studies have shown that some nanoparticles have the ability to penetrate tissues and membranes, which can have a harmful effect inside the cells.

Free nanoparticles are easily accessible to the environment and can penetrate living organisms.
Archive

However, before reaching living organisms, researchers have many questions to answer. As with any other compound, the potential impact of nanoparticles can be positive, unfavorable or neutral depending on factors such as toxicity, bioavailability, mobility, stability, solubility and reactivity.

Diverse particles, multiple effects

So far, most studies have focused on measuring the effects of ultrafine particles (UFP). These particles, of a diameter of less than 100 nanometers, can be natural or man-made, often involuntarily: in industry, diesel engines, other combustions, volcanoes, detached from the ground, etc.

Ultrafine particles remain in the air and the wind can take them far. The large surface can carry contaminants, oxidizing gases, organic compounds and transition metals adsorbed on the surface. Moreover, it can react with other elements present in the atmosphere, leading to the formation of new particles of very different reactivity and characteristics.

As seen in the following images, lead nanoparticles can form different structures.
ANL
Therefore, the toxicity of ultrafine particles and their health effects are varied. However, it is demonstrated that ultrafine particles reach the body through or through inhalation of the skin and that their concentration in the air is directly related to cardiovascular disease. It has also been observed that some people interfere with the proper functioning of neurons, while asthma and other diseases occur in the respiratory system.

Nanoparticles are very similar to ultrafine particles. Their size is similar, and the biggest difference is that they are those created by man in certain processes and not by chance. Otherwise, they behave similarly. Therefore, together with the development of nanotechnology it is essential to know the influence of nanoparticles. To do this, researchers need to look for new ways, not only to measure impact, but also for the detection and monitoring of nanoparticles, since conventional detection methods do not serve to detect nanoparticles.

From laboratory to industry

This topic has already been addressed in Euskal Herria. CIC nanoGUNE will coordinate the activities of companies dedicated to nanotechnology in the Basque Country and, although it has not yet been launched, CIC nanoGUNE is clear that it will focus on two aspects: on the one hand, on the security control of products generated by nanotechnology for medical applications and, on the other, on the realization of an observatory of nanosegmentation.

LABEIN-Tecnalia participates in the SAPHIR project. The aim of this project is to develop a safe workshop for the production of nanomaterials.
LABEIN-Tecnalia

According to Igor Campillo, one of the main functions of this observatory will be the monitoring of projects that analyze the impact of nanoparticles and products through nanotechnology on health and the environment. In addition, they plan to create working protocols with nanomaterials and nanoparticles. The issue is that as nanotechnology develops, it moves from laboratories to industry. By then, it is convenient to have protocols to ensure the safety of workers and consumers of products.

Currently there are companies that use nanotechnology, such as Inasmet-Tecnalia, Gaiker-IK4 or LEIA-IK4, which take security and prevention into account. LABEIN-Tecnalia as the VI European Union R&D Congress. Participates in the SAPHIR project included in the Framework Program. The aim of this project is to develop a nanomaterial production plant.

This workshop will cover the entire nanomaterial production chain (production, recovery, adaptation and recycling). In the words of Yolanda de Miguel, head of the LABEIN-Tecnalia project, the keys to the workshop will be competitiveness and, above all, ensuring safety at all points. In this way a method is being created that ensures that nanoparticles are not lost.

To demonstrate the effectiveness of the SAPHIR project, through nanotechnology and completely safely, they will create high-value-added products: automotive lights, more resistant materials for aeronautics, fuel cells for energy and self-cleaning walls for construction.

The aim of CIC nanoGUNE is to create working protocols with nanomaterials and nanoparticles.
Archive
Such projects demonstrate the effort that companies and organizations are making to apply the precautionary principle in all areas of nanotechnology. In fact, it is true that nanoparticles can damage, but scientists believe that this is why nanotechnology should not be ruled out. Otherwise, the potential benefits of this technology would be lost. Instead, they propose a good knowledge of the risks and the creation of ways to avoid adverse effects. And in it they are.

References:
US strategy on nanotechnology effects research: Strategy for Nanotechnology-related Environmental, Health and Safety Research.
Code of Community Conduct for the Use of Nanotechnology: EU
Nanotechnology in the market
There are hundreds of products manufactured with nanotechnology on the market, although there is no clear legislation and regulation on the use of nanotechnology for the production of commercial products. The international organization PEN (“The Project on Emerging Nanotechnologies”) offers an updated inventory of these products on its website. A total of 606 have been inventoried specifying the name, identity of the producer, origin and category of each of them. Other data that appear are the photo, the characteristics, the internet address of the product (if available) and the date of entry in the list.
Nanotechnology product fair in Finland.
(Photo: P. Forsgard)
By categories, decorative and maintenance elements are the most abundant. In this category there are 369 products of this type, such as cosmetics, clothing, self-care products, sports equipment, solar creams... The rest of the products are distributed in the following categories: household and garden, food, electronics and computers, automotive, appliances and children's products.
All these products are made in 20 countries, half in the United States and, above all, in East Asia (China, Taiwan, Korea and Japan) and in Europe (Great Britain, France, Germany, Finland, Switzerland, Italy and Sweden). On the other hand, they indicate the material used in almost half of the products. The most outstanding part is silver, followed by carbon, zinc, silicon, titanium and gold. It seems to be a nice hook to attract consumers to say that a product contains silver nanoparticles.
Benefits of nanotechnology in health and the environment
While the harmful health and environmental effects of nanoparticles are being studied, it is undeniable that nanotechnology also expects benefits in both areas.
For example, they believe that nanomedicine will allow a better understanding of the functioning of the body, both at the molecular and nanometric level, which will allow an early diagnosis and treatment of diseases. They hope it will also contribute to imaging.
(Photo: Archive)
However, without waiting, the advantages of nanotechnology are already being applied in some aspects of medicine: there are nanotechnology-based systems on the market to get medicines in the most effective way. And although they are still in the research phase, cartilage, bones and artificial skins are very advanced for use in regenerative medicine.
As for the environment, it can report multiple benefits. On the one hand, nanotechnology expects energy and raw material savings to benefit the environment. On the other hand, conservation or environmental recovery applications based on nanotechnology are being developed: nanosensors for the detection of heavy metals or pesticides, filters that prevent the emission of pollutants, nanoparticles that eliminate pollutants from water, etc.
Galarraga de Aiestaran, Ana
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