seminars for mechanical engineering

NANO TECHNOLOGY AND PROTOTYPING

                                                                   ABSTRACT

 

This paper builds on concepts introduced in, "Three Systems Of Ethics For Diverse Applications”. Nanotechnology presents a wide range of problems and opportunities: not just diverse issues, but different kinds of issues. This paper provides a brief overview of the problems and benefits created by nanotechnology, and substantiates the claim that a variety of ethical systems will be necessary to deal appropriately with the range of issues raised by nanotech. It begins by discussing the power of nanotechnology as a technology, then surveys the risks, commercial opportunities, and abundance that may be created by nanotech, and concludes by restating the need for the deliberate development of collaboration between diverse organizations with radically different ethics.

INTRODUCTION

Ethical Administration of Nanotechnology

Any organization has an explicit or implicit code of ethics: rules that its members are expected to follow. We expect merchants to be honest, policemen to be honorable, and librarians to be informative. There are at least three ethical systems that are commonly used to administer different types of resources. Defending against loss is best achieved by Guardian ethics, which include the use of force and deception. Resources that can be traded to mutual benefit are best administered with Commercial ethics, which include honesty and efficiency. Things that can be freely duplicated, producing unlimited benefit, are best handled with Information ethics, which maximize the accessibility and utility of such resources. Nanotechnology presents a wide range of problems and opportunities: not just diverse issues, but different kinds of issues. Many of these issues have arisen already, with older technologie and institutions.  Nanotech will make most existing products quite a bit more powerful and flexible; it will probably also allow the creation of new products, and even of new ways of manufacturing and distributing products. The promise of nanotech is material abundance and rapid improvement of technology at low cost and high convenience. The threat of nanotech is the potential of developing and fabricating dangerous weapons, drugs, and other undesirables covertly or in large quantity. To minimize the threat while maximizing the benefit will require the cooperation of many organizations of several distinct types. The Capabilities of Nanotechnology Nanotechnology has several meanings. The National Science Foundation defines nanotech as, "Research and technology development at the atomic, molecular or macromolecular levels, in the length scale of approximately 1 - 100 nanometer range, to provide a fundamental understanding of phenomena and materials at the nanoscale and to create and use structures, devices and systems that have novel properties and functions because of their small and/or intermediate size." By this definition, some kinds of nanotechnology exist already. Computer manufacturers are exploring new types of circuits built with individual molecules, and other technologies too numerous to list are being developed or already in use. Rapid prototyping is the production of 3D parts using a sort of 3D printer. Parts can be made of plastic, metal, or other substances, and can be quite intricate. Efforts are currently under way at the macro-scale to build rapid prototyping systems that can use a variety of materials to build complete products, not just parts. We should expect rapid prototyping to develop at least as rapidly as 2D color printing. It's easy to forget how rapidly inkjet printers have developed from grainy black-and-white to photo-quality color. Even if rapid prototyping does not become economically viable for home use, it will certainly find a niche in industry that will fuel its continued development. At least one rapid prototyping capability, dip-pen nanolithography (DPN), is being developed at the nanoscale. DPN can be done with a desktop machine, and can deposit a wide variety of materials. It seems clear that, to at least some extent, we will be able to build structures with nanometer-scale parts. Nanoscale motors and structures have already been tested in the lab. There is no evidence that a nanoscale machine would violate any laws of physics; the only question is how well we can engineer such a thing, and how long it will take to invent and develop a particular device. Certain visionary organizations such as Foresight Institute assert that we will be able to build entire robot systems at the nanometer or even atomic scale. Such a system could be used to build a rapid-prototyping machine capable of duplicating its own construction. Even if a desktop-scale, convergent-assembly, rapid-prototyping nanofactory is too difficult to build in the near term, the combination of rapid prototyping and nanometer-scale technology will enable a wide range of new product designs with an unprecedented ease of manufacture. However, the complexity of a desktop-scale nanofactory is probably less than that of a large commercial software package, and the return on investment is far greater. If one projects any of several technology curves, it appears likely that we will be building machine-scale molecules, or molecule-scale machines, within a few decades. For the sake of argument, this paper will assume the development of a self-duplicating desktop nanotech factory. The path of technology development may not lead in this direction, but some technology of equivalent power will certainly be developed within the lifespan of most readers. Nanotech will also have a large impact on the most mundane products. Carbon nanotubes (Buckytubes) are many times as strong as steel, and can also be used as wires, computer switches, chemical sensors, heat conductors, and for storing hydrogen. Silicon nanocrystals do interesting things to light; they can be used for biotech research, optical computing, and to make more efficient light bulbs. Nano-sized aluminum powder makes a better rocket fuel. Zeolites, materials with nano-sized holes, are useful in all sorts of industrial processes. The list goes on and on--every time we study something at the nanometer scale, we find new effects that are often amazingly useful, both for new products and in existing products. Even if we ignore the nano-robot scenarios, we will see unprecedented improvement in many of our current technologies, including computers and weapons. Even the conservative opinions about nanotechnology sound like a new industrial revolution. Reducing the Risks of Nanotechnology: Guardian Systems In 2002, researchers used DNA purchased over the Internet to build fully infectious polio virus. A nanotech-based rapid-prototyping or manufacturing capability, whether available in the home or by mail order, would be able to build things more intricate and functional than a simple virus. Nanometer-scale computer circuitry will probably be one of the first products; this enables all sorts of computing, communication, and surveillance devices. If the technology is based on biochemistry, then medicines, drugs, and poisons may be available; indeed, a wide range of custom-designed chemicals. If the technology is based on rigid machine parts, then a wide range of shapes and manipulations will be possible; it has already been demonstrated that a cavity in plastic can act as a "binding site" to trap chemicals, so even a purely mechanical nanotechnology should be able to interact with biochemical systems to some extent. Today's supercomputers can be used for tasks of military significance, such as simulating nuclear explosions and cracking codes These computers may be integrated with devices of varying degrees of sophistication; but a near-magical surveillance technology could be packaged into a device too small to see. Even the mundane types of nanotech products may need to be controlled. The more extravagant suggestions, such as "gray goo," can get quite scary. Gray goo is a kind of nanodevice that takes in biomass and turns it into copies of the gray goo device. In theory, if such a device were not countered, it could "eat" the biosphere. Fortunately, the design of such a device would be quite difficult. Furthermore, devices of the gray goo class would have no commercial or even military use, since more specialized non-replicating devices would be far more efficient. It is thus highly unlikely that anyone would build a gray goo, or device that could run amok and become gray goo, by accident, and military or commercial organizations would have little interest in building such a thing on purpose. However, the prevalence of computer viruses indicates that some people build things like this for fun.                                          Second, nanotech will provide benefits that are simply too good to pass up, including environmental repair; clean, cheap, and efficient manufacturing; medical breakthroughs; immensely powerful computers; and easier access to space.            Of course, innovation will be necessary, but it must occur outside of the Guardian mindset. This is one of several reasons why a Guardian-only solution such as attempting to outlaw nanotech research cannot work. Instead, the guardians must be willing to allow a broad range of innovation, carried out by more than one type of organization, and then adapt the most suitable technologies to do their work. Nanotech For Profit: Commercial Systems "Be thrifty. Be optimistic. Be efficient. Be industrious. Be honest." No, it's not the Boy Scout Oath; it's a few of the Commercial ethics. Commercial organizations will work very hard to give people what they want--or what they will pay for, which is frequently the same thing. If a product needs to be developed to satisfy a market, some company somewhere will probably be working on it. Money can be a great incentive. Commercial organizations must compete, but they are not allowed to use force--that is reserved for Guardian organizations. So they try to make their products better, and sell to more people. They are willing to invest in developing products, and making them easier to use, and making consumers aware of them. They are accustomed to collaborating and innovating, and to making and keeping contracts. Nanotechnology encompasses hundreds of new technologies, many of them quite specialized and quite useful. The development of all this potential requires an incentive, and commercial organizations will use the incentive of money to bring the benefits of nanotech to a wide swath of the population. Without the commercial system, many applications of nanotech would not be developed nearly as quickly, if at all. Long-term benefits, like hidden costs, are largely ignored by the commercial mindset. . Unlimited Benefits of Nanotechnology: Information Systems The invention of writing allowed information to be stored for later use, and even copied verbatim. The printing press made the copying process much easier, giving many more people access to the information. Computers, with networks and word processors, have reached another level. The cost of copying information is virtually zero. You can write a book yourself, then email it to all your friends or put it on a web site for the whole world to see. You can do the same thing for recipes, music, and drawings. With some training, you can even write a better word processing program so that all your friends--or the whole world--will find it easier to write books. There are programs to help you write that word processing program, and there are people working to improve those programs. The whole system can be improved exponentially, as long as people are willing to "give away" their work. It may seem strange at first, but many people are willing to do just that. Microsoft operating systems cost hundreds of dollars. The Linux operating system is absolutely free. How can this be? What induced the thousands of Linux programmers to work without pay? It's only a matter of time until the manufacture of products becomes as cheap as the copying of files. Nanotechnology will help this process along, because the first practical self-duplicating factory will almost certainly be designed on the nanometer scale. A tabletop model might weigh two pounds, and use methanol as a raw material. The amount of methanol required to produce a new factory would cost less than a dollar, and a well-designed factory could process that much material in an hour or so. Once one such factory exists, it and its copies can be used to make an unlimited number of tabletop factories, cheap enough to give away. Building a new product would be as simple as emailing its blueprint to the factory--which might be sitting beside your computer.  Of course this would only be possible if the factories were not restricted to prevent their making free products Building a Nanotech Society: A Balance of Power As described above, nanotechnology will present a large range of new problems and new opportunities. Commercial and Information groups cannot be trusted to take appropriate precautions in every case, so a Guardian approach is sometimes necessary. Likewise, Guardian and Information ethics do not create money, so Commercial organizations must be involved to pay for large parts of the development and deployment of the technology. Finally, although Guardian ethics include "Dispense largesse," neither Guardian nor Commercial organizations can be expected to create and distribute the almost limitless benefits that will become possible from vastly improved materials and manufacturing. Ideally, each organization involved in nanotechnology would be aware of its own ethics and the ethics of the organizations it interacts with, and make good decisions about which problems to tackle and which problems to leave for someone else. In practice, of course, organizations are usually not so self-aware, and even when they are, short-sighted self interest may tempt them to expand into areas where they have no competence. In the end, an organization that overreaches itself will find that its plans don't work; it will make ineffective and antisocial decisions, and it will be out-competed by its fellow organizations and attacked by those it has encroached on. However, such a process may take much time and cause much destruction; consider the long-delayed fall of the Soviet Union, due in large part to its application of Guardian ethics to commerce and information. Nanotechnology will develop too quickly for such slow adjustments. If an organization manages to usurp power in an area where it does not belong, and hold that power for even a few years, it may create an imbalance that tempts a radical and destructive solution. The phrase, "Information economy," is a clear symptom of attempting to mix two ethical systems. Companies that tried to make money in the Information Economy were doomed from the start. One after another, they found that they could get a large number of users as long as the "customers" were not paying them any money; the customer base grew exponentially, as might be expected in an unlimited-sum system. Yet when the companies began charging fees, most of the users went elsewhere. We may suspect that many of these users felt that charging fees for what had been a free service was unethical. In terms of Information ethics, it is in fact improper to charge fees. The companies that succeeded, such as Amazon.com, were the ones that offered a traditional Commercial service, using the vast potential of the Internet simply as a communication channel.  A Specific Proposal As explained above, a tabletop factory appears to be quite possible with moderately sophisticated nanotech. Such a factory could form the core of a nanotech delivery infrastructure. Depending on the cost of the factory, it could either be available in service bureaus or in individual homes. It would be able to produce an immense range of incredibly useful products at very low cost. The benefits to society would be almost incalculable: the financial and environmental costs of manufacturing and transportation would disappear, and new products would be available far more quickly, and customized for each user. Once a nanofactory can be built, people will demand access to it; it is too useful to pass up. If a legitimate one is not provided, people will obtain black market devices of comparable functionality. Such devices would presumably be uncontrolled, short-circuiting any attempt to regulate, tax, or charge royalties on any product they produced. Since a small nanofactory can make a bigger one, and a large one can make thousands of duplicates, smuggling would be impossible to prevent. It is in the interests of both Guardian and Commercial organizations to supply nanofactories, as capable and flexible as possible, to the entire population, to minimize the black market and the illicit information distribution networks. This flexibility must include the ability to build certain products with minimal royalties or taxes--preferably zero added cost, because anything else will only encourage illicit factories. Of course, the factories cannot be completely flexible. Certain weapons, drugs, and dangerous nanobots should be prohibited, and all commercial intellectual property should be controlled according to the wishes of the owner. However, aside from these limitations, Information workers should be given free rein to design and give away any product. This will greatly reduce the pressure for illicit factories. Free availability of freely designed products will not eliminate commercial value; "Promote comfort and convenience" is a Commercial ethic, but not an Information ethic. We see this in practice--it is well known that Linux is more difficult for the average user than, say, Microsoft Windows. Products of Information are likely to be highly functional, but not especially easy to use or stylish--except for the type of people who produced them. Still, the activities of Information-producing groups will serve as a release for needs the Commercial groups are failing to fill. They will also serve as a source of innovation that will be usable by both Commercial and Guardian groups, which will certainly have their hands full trying to keep up with the rapidly advancing technology. Branding, advertising, and spreading "fear, uncertainty, and doubt" about free products are other ways that Commercial entities can make their products desirable. But even the simplest medical and hygiene products will benefit greatly from nanotech, and will need to be studied carefully to ensure their safety. Government regulatory bodies, such as the FDA, and private organizations such as Underwriters Laboratories have been performing this function for conventional products. Perhaps the biggest problem would be ensuring that Information people submitted to regulation--"Shun authority" is one of their ethics--or rather, that they did not become frustrated with the regulation and obtain (or create!) illicit factories. However, researchers running experiments on human subjects have been required for several decades to submit their experimental plans to an "Institutional Review Board," and researchers in other sensitive fields such as genetically modified bacteria face similar restrictions. Designing a functional nanotech product will require significant training, and the training period may be used to create a culture of responsibility. CONCLUSION In summary, the creation and wide distribution of nanotech factories appears to maximize the benefits of nanotechnology while providing opportunities to minimize the risks. Guardian/regulatory, Commercial, and Information/creative organizations will all be able to pursue their goals through this infrastructure, which will provide substantial benefits to society while short-circuiting many illicit uses of advanced nanotech-based manufacturing. It is not too soon to begin designing the procedures, organizations, and technologies that will be required to make this infrastructure work and give everyone access to it.