An event at London’s Institute of Contemporary Arts next Tuesday, 23 November, promises an inter-disciplinary panel discussion to imagine the possibilities of nanotechnology for life and art. Nano: the science of small things will be chaired by James Wilsdon, from the think-tank Demos. James is one of the authors of the pamphlet See-Through Science that I mentioned below. On the panel are the science fiction writer Paul McAuley, Tom Feilden, the science and environment correspondent for BBC Radio 4’s Today programme, Philip Moriarty, an outstanding young nanoscientist from the University of Nottingham, and myself.
A debate about nanotechnology last Monday at the Royal Institution was run in association with a project called Small Talk, which is planning to run dialogue events about nanotechnology across the UK. This project is a collaboration between the leading organisations in science communication in the UK, The Royal Institution, the British Association, a group of science centres and the Cheltenham Festival of Science. For a science communication organisation they are being a bit reticent, in that they haven’t yet got a web-site up, but I guess we can take this as evidence that nanotechnology has come to the top of the agenda of the science communication professionals.
To be honest, I thought that last Monday’s event actually highlighted some of the problems that this enterprise faces. There are a number of different levels at which one can talk about nanotechnology. You can have a straight discussion about what the technology actually is and what it is likely to become in the near future. At this level, there’s going to be some work to do explaining the basic science, as well as some mentions of the traditional exhibits of contemporary nano-business: tennis rackets, sun-cream, stain resistant trousers etc. You can discuss the debate about what the future holds for the technology, and what the prospects are for the Drexlerian visions. And you can also discuss how one ought to run debates about science and technology and what the right relationship between the public and scientists should be. It’s easy to end up trying to talk about all three, and the result of this is confusion and an unfocused discussion.
While I do applaud James Wilsdon’s notion of an upstream debate, in which people get to discuss technology before it actually arrives, it does take for granted that there are some common assumptions about what the technology actually is. We don’t yet have that common ground when we talk about nanotechnology.
Here I continue my attempt to define what is meant by the term nanotechnology. In Part 1 I tried to define the relevant length-scale, the nanoscale, and in Part 2 I made the distinction between nanoscience and nanotechnology. This leaves us with a definition of nanotechnology that includes any branch of technology that results from our ability to control and manipulate matter on the nanoscale.
This is impossibly broad, and a lot of trouble continues to be caused by people confusing the many very different technologies that are grouped together in this word nanotechnology. I’ve found it useful to break the definition up in the following way (of course the boundaries between the categories are porous and arbitrary):
At the Royal Institution debate on nanotechnology this evening (about which I’ll write more later) one comment by James Wilsdon, of the think-tank Demos, stuck in my mind:
“Richard Jones’s work, in Soft Machines, has complexified and problemetised the debate about radical nanotechnology.”
He assured me afterwards that this was a good thing.
Soft Machines: nanotechnology and life , by Richard A.L. Jones, is at last published in the USA on October 31 by Oxford University Press. The book is aimed at the general reader, and it explains why things behave differently at the nanoscale to the way they behave at familiar human scales. The book argues that the design principles used by cell biology – the best example we have of a sophisticated working nanotechnology – are particularly well suited to the unfamiliar way physics works at the nanoscale, and that we should try to use the same principles in nanotechnology. Topics discussed include self-assembly in biological and non-biological systems, natural and synthetic molecular motors, molecular electronics and chemical computing.
For anyone in London and at a loose end next Monday, 1 November, there’s an event on at the Royal Institution from 7 pm to 8.30 pm: Nanotechnology: can something so tiny promise something so big?. It’s a debate about nanotechnology and its potential, chaired by the science writer Philip Ball, and featuring myself, Ray Oliver, an industrial nanotechnologist and one of the authors of the recent Royal Society report, and James Wilsdon, from the thinktank Demos, whose recent pamphlet about ways to engage the public about new technologies such as nanotechnology, See-through Science, I wrote about below. It should be an interesting evening.
A suite of refurbished laboratories in my department (Physics and Astronomy, University of Sheffield) was formally opened yesterday by Dame Julia Higgins, chair of EPSRC and Vice President of the Royal Society. The labs were refurbished with money from the Wolfson Foundation and the Royal Society and now house Maurice Skolnick’s work in semiconductor nanotechnology, as well as my own group’s labs. We marked the occasion with a set of scientific seminars.
It’s always interesting to get an update on what one’s colleagues are up to, and Maurice’s talk had some stunning examples of recent progress in semiconductor nanotechnology. I’ll show just one example.
The picture shows (left) a very small diameter photonic micropillar – one can make out a central enclosure, the cavity, sandwiched between two distributed Bragg reflectors (DBRs). These are multilayers of different semiconductors which behave as near-perfect mirrors for light; photons generated inside the cavity are essentially trapped by the mirrors and the edge of the pillar.
Simply to make these intricately structured micropillars is enough of an achievement (these were made at Sheffield by A Tahraoui and P W Fry). But within the cavity there is a further level of control. The pictures on the right show individual quantum dots, grown by self-assembly. These are incorporated within the cavity of the structure on the left (the transmission electron micrograph, labelled TEM, comes from Hopkinson and Cullis at Sheffield, the scanning tunelling micrograph, labelled STM, from Skolnick’s collaborator P.M. Koenraad at Eindhoven). The resulting structure simultaneously exploits the quantum effects that occur when electrons are confined within the quantum dots, with the optical confinement effects that occur when photons are trapped within the cavity. This allows simultaneous control both of the energies of electronic states in the quantum dot and of the way transitions between electronic states are coupled to the emission of light.
Quantum dots of this kind are already used to make solid state lasers for use in optical communications. What is really exciting Maurice and his colleagues, though, is the possibility that this kind of structure might be used as the basis for a quantum computer. Quantum computers, if one could get them to work, offer the possibility of massively parallel computing of a power unparalleled with our current CMOS technologies. The problem is that one has to keep quantum states isolated from the environment enough to work their quantum magic, but one still has to retain the ability to interact with the states enough to provide some kind of input and output to the computations. This kind of structure, with its very close control both of the states themselves, and, via the photonic control, of their interactions with the outside world, may just possibly do the trick.
I had a late night in the prosperous, liberal, Yorkshire town of Ilkley last night, doing a talk and question and answer session on nanotechnology at the local Cafe Philosophique. An engaged and eclectic audience kept the discussion going well past the scheduled finish time. Two points particularly struck me. One recurring question was whether it was ever realistic to imagine that we can relinquish technological developments with negative consequences – “if it can be done, it will be done” was the comment made more than once. I really don’t like this conclusion, but I’m struggling to find convincing arguments against it. A more positive comment concerned the idea of regulation; we are used to thinking of this idea entirely in terms of narrow prohibitions – don’t release these nanoparticles into the environment, for example. But we need to work out how to make regulation a positive force that steers the technology in a desirable direction, rather than simply trying to sit on it.
(Non British readers may need to know that the headline is a line from a rather odd and morbid folk-song called “On Ilkley Moor baht hat”, sung mostly by drunken Yorkshiremen.)
In the first part of my attempt to define nanotechnology terms, I discussed definitions of the nanoscale. Now I come to the important and underappreciated distinction between nanoscience and nanotechnology.
Nanoscience describes the convergence of physics, chemistry, materials science and biology to deal with the manipulation and characterisation of matter on the nanoscale.
Many subfields of these disciplines have been dealing with nanoscale phenomena for many years. A very non-exhaustive list of relevant sub-fields, with examples of topics in nanoscience, would include:
The distinguishing feature of nanoscience is that increasingly we find methods and techniques from more than one of these existing subfields combined in novel ways.
Nanotechnology is an engineering discipline which combines methods from nanoscience with the disciplines of economics and the market to create usable and economically viable products.
Nanoscience and nanotechnology need to be distinguished. Without nanoscience, nanotechnology will not be possible. On the other hand, if you invest money in a nanoscience venture under the impression that it is nanotechnology, you are sure to be disappointed.
In the next installment, I’ll discuss the various kinds of nanotechnology, from incremental technologies such as shampoos and textile treatments to the more radical visions.
It’s that time of year when academic corridors are brightened by the influx of students, new and returning. I’m particularly pleased to see here at Sheffield the new intake for the Masters course in Nanoscale Science and Technology that we run jointly with the University of Leeds.
We’ve got 29 students starting this year; it’s the fourth year that the course has been running and over that time we’ve seen a steady growth in demand. I hope that reflects an appreciation of our approach to teaching the subject.
My view is that to work effectively in nanotechnology you need two things, First comes the in depth knowledge and problem-solving ability you get from studying a traditional discpline, whether that’s a pure science, like physics and chemistry, or an applied science, like materials science, chemical engineering or electrical engineering. But then you need to learn the languages of many other disciplines, because no physicist or chemist, no matter how talented at their own subject, will be able to make much of a contribution in this area unless they are able to collaborate effectively with people with very different sets of skills. That’s why to teach our course we’ve assembled a team from many different departments and backgrounds; physicists, chemists, materials scientists, electrical engineers and molecular biologists are all represented.
Of course, the nature of nanotechnology is such that there’s no universally accepted curriculum, no huge textbook of the kind that beginning physicists and chemists are used to. The speed of development of the subject is such that we’ve got to make much more use of the primary research literature than one would for, say, a Masters course in physics. And because nanotechnology should be about practise and commercialisation as well as theory we also refer to the patent literature, something that’s, I think, pretty uncommon in academia.
In terms of choice of subjects, we’re trying to find a balance between the hard nanotechnology of lithography and molecular beam epitaxy and the soft nanotechnology of self-assembly and bionanotechnology. The book of the course, “Nanoscale Science and Technology”, edited by my colleagues Rob Kelsall, Ian Hamley and Mark Geoghegan, will be published in January next year.