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Nanotechnology in Warefare is a branch of nano-science in which molecular systems are designed, produced and created to fit a nano-scale (1-100nm)(Carruthers, 2018). The application of such technology, specifically in the area of warfare and defence, has paved the way for future research in the context of weaponisation. Nanotechnology unites a variety of scientific fields including material science, chemistry, physics, biology and engineering (U.S. Government). Advancements in this area, have led to categorised development of such nano-weapons with classifications varying from; small robotic machines, hyper-reactive explosives, and electromagnetic super-materials (Nichols, 2017). With this technological growth, has emerged implications of associated risks and repercussions, as well as regulation to combat these effects. These impacts give rise to issues concerning global security, safety of society, and the environment. Legislation may need to be constantly monitored to keep up with the dynamic growth and development of nano-science, due to the potential benefits or dangers of its use. Anticipation of such impacts through regulation, would 'prevent irreversible damages' of implementing defence related nanotechnology in warfare (Tate, 2014).

Origins
Historical use of nanotechnology in the area of warfare and defence has been rapid and expansive. Over the past two decades, numerous countries have funded military applications of this technology including; China, United Kingdom, Russia, and most notably the United States. The US government has been considered a national leader of research and development in this area, however now rivalled by international competition as appreciation of nanotechnology's eminence increases (Carafano, 2007). Growth of this sphere, therefore has a dominant platform at the forefront of military interests in the use, or misuse of its power.

U.S. National Nanotechnology Initiative
In 2000, the United States government developed a National Nanotechnology Initiative to focus funding towards the development of nano-science and its technology, with a heavy focus on utilising the potential of nano-weapons.This initial US proposal has now grown to coordinate application of nanotechnology in numerous defence programs, as well as all military factions including Air Force, Army and Navy. From the financial year 2001 through to 2014, the US government contributed around $19.4 billion dollars to nano science, moreover the development and manufacturing of nano-weapons for military defence (Sargent, 2014).

Developments
Successful transitions of nanotechnology into defence products (DOD, 2009):


 * Lifetime of material coatings increased from hours to years, however further development continuing (see below).
 * Nano-structured silicate manipulation reducing insulation weight by 980lbs.
 * High Power Microwave (HPM) devices with reduced weight, shape and power consumption.

Current Research
Most recent research into military nanotechnological weapons includes production of defensive military apparatus, with objectives of enhancing existing designs of lightweight, flexible and durable materials. These innovative designs are equipped with features to also enhance offensive strategy through sensing devices and manipulation of electromechanical properties.

Soldier Battlesuit
The Institute for Soldier Nanotechnologies (ISN), deriving from a partnership between the United States Army and MIT, provided an opportunity to focus funding and research activities purely on developing armour to increase soldier survival. Comprised of seven teams, each team produces innovative enhancing features for different aspects for a future US soldier bodysuit. These additional characteristics include energy-absorbing material protecting from blasts or ammunition shocks, engineered sensors to detect chemicals and toxins, as well as built in nano devices to identify personal medical issues such as haemorrhages and fractures (Thomas, 2004).

Enhanced Materials
Creation of sol-gel ceramic coatings has protected metals from; wear, fractures and moisture, allowing adjustability to numerous shapes and sizes, as well as aiding "materials that cannot withstand high temperature" (Carbajal, 2001). Current research focuses on resolving durability issues, where stress cracks between the coating and material set limitations on its use and longevity. The drive for this research is finding more efficient and cost effective uses in application of nanotechnology for Airforce and Navy military groups. Integration of fibre-reinforced nano-composites in structural features, such as missile casings, can limit overheating, increase reliability, strength and ductility of the materials used for such nanotechnology (DOD, 2017).

Engineers and scientists alike, realise some of these proposed developments may not be feasible within the next two decades as more research needs to be undertaken, improving models to be quicker and more efficient. Particularly molecular nanotechnology, requires further understanding of manipulation and reaction, in order to adapt it to a military arena (Lele, 2009).

Implications
Nanotechnology and its use in warfare promises economic growth however comes with the increased threat to international security and peacekeeping. The rapid emergence of new nanotechnologies have sparked discussion surrounding the impacts such developments will have on geo-politics, ethics, and the environment.

Geo-political
Difficulty in categorisation of nano-weapons, and their intended purposes (defensive or offensive) compromises the balance of stability and trust in the global environment. "A lack of transparency about an emerging technology not only negatively effects public perception but also negatively impacts the perceived balance of powers in the existing security environment."(Kosal, 2014). The peace and cohesion of the international structure may possibly be negatively affected with a continuing military-focused development of nanotechnology in warfare. Ambiguity and a lack of transparency in research increases difficulty of regulation in this area. Similarly, arguments put forward from a scientific standpoint, highlight the limited information known, concerning the implications of creating such powerful technology, in regards to reaction of the nano-particles themselves. "Although great scientific and technological progress has been made, many questions about the behaviour of matter at the nanoscale level remain, and considerable scientific knowledge has yet to be learned."(DOD, 2009).

Environmental
The introduction of nanotechnology into every day life enables potential benefits of use, yet carries the possibility of unknown consequences for the environment and safety. Possible positive developments include creation of nano-devices to decrease remaining radio-activity in areas, as well as sensors to detect pollutants and adjust fuel-air mixtures.(U.S. EPI, 2005). Associated risks may involve; military personnel inhaling nanoparticles added to fuel, possible absorption of nanoparticles from sensors into the skin, water, air or soil, dispersion of particles from blasts through the environment (via wind), alongside disposal of nano-tech batteries potentially affecting ecosystems. (Glenn, 2006). Applications for materials or explosive devices, allow a greater volume of nano-powders to be packed into a smaller weapon, resulting in a stronger and possibly lethal toxic effect.

Social and Ethical
It is unknown the full extent of consequences that may arise in social and ethical areas. Estimates can be made on the associated impacts as they may mirror similar progression of technological developments and affect all areas. The main ethical uncertainties entail the degree to which modern nanotechnology will threaten privacy, global equity and fairness, while giving rise to patent and property right disputes.

Controversy surrounding the innovation and application of nanotechnology in warfare highlights dangers of not pre-determining risks, or accounting for possible impacts of such technology. "The threat of nuclear weapons led to the cold war. The same trend is foreseen with nanotechnology, which may lead to the so-called nanowars, a new age of destruction."(DOD, 2017).

Regulation
International regulation for such concerns surrounding issues of nanotechnology and its military application, are non existent. There is currently no framework to enforce or support international cooperation to limit production or monitor research and development of nanotechnology for defensive use.(Ridge, 2018). "Even if a transnational regulatory framework is established, it is impossible to determine if a nation is non-compliant if one is unable to determine the entire scope of research, development, or manufacturing." (Kosal, 2014).

Producing legislation to keep-up with the rapid development of products and new materials in the scientific spheres, would pose as a hinderance to constructing working and relevant regulation. Productive regulation should assure public health and safety, account for environmental and international concerns, yet not restrict innovation of emerging ideas and applications for nanotechnology. (CIE, 2011).

Proposed Regulation
Approaches to development of legislation, possibly include progression towards classified non-disclosive information pertaining to military use of nanotechnology. A paper written by Harvard Journal of Law and Technology, discusses laws that would revolve around specific export controls and discourage civilian or private research into nano-materials. This proposal suggests mimicking the U.S. Atomic Energy Act of 1954, restricting any distribution of information regarding the properties and features of the nanotechnology at creation.

The Nanomaterial Registry
A United States National Registry for Nanotechnology has enabled a public sphere where reports are available for curated data on physico-chemical characteristics and interactions of nanomaterials (2017). Requiring further development and more frequent voluntary additions, the register could initiate global regulation and cooperation regarding nanotechnology in warfare.

The registry was developed to assist in the standardisation, formatting, and sharing of data. With more compliance and cooperation this data sharing model may "simplify the community level of effort in assessing nanomaterial data from environmental and biological interaction studies." Analysis of such a registry would be carried out with expertise by professional nano-scientists, creating a filtering mechanism for any potentially newly developed or dangerous materials.

However, this idea of a specific nonmaterial registry is not original, as several databases have been developed previously including the caNanoLab and InterNano which are both engaging and accessible to the public, informatively curated by experts, and detail tools of nano manufacturing. The National Nanomaterial Registry, is a more updated version in which information is collated from a range of these sources and multiple additional data resources. It translates a greater range of content regarding; comparison tools with other materials, encouraging standard methods, alongside compliance rating features.