- Nanofabrication: Techniques and Principles - PDF Free Download
- Top-down versus bottom-up nanofabrication
- Nanofabrication: Techniques and Principles / Edition 1
- Electrochemical Nanofabrication: Principles and Applications, Second Edition
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Sitemap Studying Manage your studies Assessment and examination Develop your skills Graduation University card Work, volunteering and career planning Get ideas Look for work Get skills and experience If things go wrong. Website feedback Online Form - Staff and student feedback. The key to using self-assembly as a controlled and directed fabrication process lies in designing the components that are required to self-assemble into desired patterns and functions.
Self-assembly reflects information coded — as shape, surface properties, charge, polarizability, magnetic dipole, mass, etc.
Nanofabrication: Techniques and Principles - PDF Free Download
Unfortunately, spontaneous self-assembly relies heavily on the particles' characteristics. Use different particles, and self-assembly will either form different structures or not occur at all.
On a very small scale you wouldn't even use the term self-assembly but rather chemical synthesis — the processes chemists have refined over many years. However, the stability of covalent bonds enables the synthesis of almost arbitrary configurations of only up to atoms.
Top-down versus bottom-up nanofabrication
Larger molecules, molecular aggregates, and forms of organized matter more extensive than molecules cannot be synthesized bond-by-bond. Self-assembly is one strategy for organizing matter on these larger scales.
This technique can be summarized as follows: We have no clue why certain atoms and molecules self-assemble the way they do, but once we can initiate and control the process we can use it to build structures from the bottom-up — atom by atom. Self-assembly has become an especially important concept in nanotechnology.
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As miniaturization reaches the nanoscale, conventional manufacturing technologies fail because it has not been possible yet to build machinery that assembles nanoscale components into functional devices. Until robotic assemblers capable of nanofabrication can be built, self-assembly — together with chemical synthesis — will be the necessary technology to develop for bottom-up fabrication read: "Mind the gap - nanotechnology robotics vision versus lab reality". Exploiting nature's self-assembly tricks is real science and it's happening in labs already. As a matter of fact, it's actually about to lead to real world products.
A recent example is IBM's announcement of self-assembling structures in their airgap processors. Self-assembly is also the reason why nanotechnologies have such a profound impact on the chemical industry.
Nanofabrication: Techniques and Principles / Edition 1
One example is the huge area of polymers used for industrial products think plastics. Chemists are using molecules' tendency to self-align to design molecular structures with specific properties. Once you know how certain nanoparticles behave and what properties they possess you can use this knowledge to deliberately create structures with desired properties.
This is a much more efficient way than the cement mixer chemistry of old where you mix compounds in a more or less arbitrary way based on best guesses and see what materials you get and then try figure out what you could do with them. The two major self-assembly techniques are colloidal self-assembly, which has exciting possibilities in terms of generating novel materials by combining nanoparticles with different properties into well-defined crystalline structures, and DNA, which is the archetypal self-assembling system.
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- Micro- and nanofabrication methods in nanotechnological medical and pharmaceutical devices.
- Top-down versus bottom-up nanofabrication.
DNA-based self-assembly offers flexibility in the types of structures that can be produced, based on single-stranded, double-stranded or duplex, and more complex supra-molecular assemblies. One-, two-, and three-dimensional structures can be made, and the ability of other nanoscale objects to be functionalized with DNA, combined with the specificity conferred by complementary sequence recognition, means that DNA can connect and organize disparate nanostructures to make relatively complex constructs, including well-controlled nanoparticle crystal lattices, and even active systems.
Electrochemical Nanofabrication: Principles and Applications, Second Edition
Engineering Teams: The fabrication projects are performed with minimum two students in a group. The students interact at each step of the design and fabrication process in order to achieve high performance of the device. The students also work together during experimentation and solving assigned problems. Contemporary Issues: The lithography limits, dry etching vs. Professional and Ethical Responsibility: A discussion of acceptable practices in studying and in doing other work within the course helps students reflect on the ethical standards of professional work.
Some ethical problems are addressed through the Engineering Handbook. Effective Communication: Emphasis is given to effective communication skills required for this class that include learning the correct terminology and vocabulary pertinent to fab and clean-room environment, process tools and equipment and technology. Progress of design and fabrication is presented and discussed among students and between students and instructor for review and improvement.