Nanofabrication: Principles, Capabilities and Limits

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Nanofabrication: Principles, Capabilities and Limits presents a one-stop description at the introductory level on most technologies that have been developed which are capable of making structures below 100nm.

Principles of each technology are introduced and illustrated with minimum mathematics involved. The capabilities of each technology in making sub-100nm structures are described. The limits of preventing a technology from further going down the dimensional scale are analyzed.

Drawing upon years of practical experience and using numerous examples, Zheng Cui covers state-of-the art technologies in nanofabrication including:

• Photon-based lithography
• Charged particle beams lithography
• Nanofabrication using scanning probes
• Nanoscale replication
• Nanoscale pattern transfer
• Indirect nanofabrication
• Nanofabrication by self-assembly

Nanofabrication: Principles, Capabilities and Limits will serve as a practical guide and first-hand reference for researchers and practitioners working in nanostructure fabrication and also provides a “tool box” of various techniques that can be easily adapted in different fields of applications.

Written for: Nanoscience and nanotechnology researchers and engineers, technical professionals and academic researchers in the fields of electrtonics, mechanical engineering, and chemical engineering.

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What Is A Career In Biotechnology Like?

Biotechnology is the integration of engineering and technology to the life sciences.

Biotechnologists frequently use microorganisms or biological substances to perform specific processes or for manufacturing. Examples include the production of drugs, hormones, foods and converting waste products.

There are many sub-branches involved in the biotech industry. A few of the more common branches include; molecular biology, genetic engineering, and cell biology.

A new and exciting sub-branch requiring biotechnologists is the field of nanotechnology. Nanotechnology gives us the capability to engineer the tiniest of objects, things at the molecular level. Nano means a billionth of a specific unit in Greek. Nanotechnology includes the study and manipulation of materials between 1 and 100 nanometers.

To give you an idea, DNA is approximately 2.5 nanometers. Red blood cells are 2.5 micrometers (1,000 times larger). And a sheet of paper is about 100,000 nanometers thick!

As you can imagine, it is very difficult to scale and mass produce objects within the realm of nanotechnology. Their minute size makes them nearly impossible to manipulate. But scientists and engineers have teamed up to make the seemingly impossible a reality.

Which means those with the proper training will be highly sought after in the future. The National Science Foundation estimates that the U.S. alone will need up to 1 million nanotechnology researchers. It is estimated that the need for nanotechnology workers will reach 2 million by 2015.

Therefore, if you’re considering getting into the field of biotech, you may want to gear your background in nanotechnology if your school offers it or seek employment in this exciting new career field after graduating.

No matter what sub-branch you wind up specializing in, biotechnologists often collaborate with others in the laboratory and bounce ideas off one another. This can create a pleasant work environment; one that involves sharing with others and working together to achieve a great goal.

Dendrimer-Based Nanomedicine

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In recent decades, dendrimers — free-shaped synthetic macromolecules — have garnered a great deal of scientific interest due to their unique molecular nanostructure. Used in a variety of scientific applications, the use of dendrimers is now widely regarded as a safer, more precise, and more effective way to practice medicine.

This book compiles and details cutting-edge research in science and medicine from the interdisciplinary team of the Michigan Nanotechnology Institute for Medicine and Biological Sciences, who are currently revolutionizing drug delivery techniques through the development of engineered nanodevices. Edited by Istvan J Majoros and James Baker, Jr., two prominent nanotechnology researchers, this book will appeal to anyone involved in nanotechnology, macromolecular science, cancer therapy, or drug delivery research.

Contents: Targeted Drug Delivery in General, New Technology in Medicine (B B Ward & J R Baker, Jr.); General Carriers for Drug Delivery (T H Dunham et al.); Poly(amidoamine) Dendrimer Synthesis and Characterization (I J Majoros & D E Carter); Optical and Biophotonic Applications of Dendrimer Conjugate (J Y Ye & T B Norris); Dendrimer Conjugates for Cancer Treatment (I J Majoros et al.); Biological Application of PAMAM Dendrimer Nanodevices in vitro and in vivo (T P Thomas & J F Kukowska-Latallo); Dendrimer-based Targeted Apoptosis Sensors for Medical Application (A Myc et al.); MRI Using Targeted Dendrimer Contrast Agents (S D Swanson & C R Williams); Nanoparticle Membrane Interactions: Mechanism for Enhanced Permeability (S Hong et al.); Computer Simulations of Dendrimers (S K Kandasamy et al.); Dendrimer-Entrapped and Dendrimer-Stabilized Metal Nanoparticles for Biomedical Applications (X-Y Shi & S H Wang).

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Nanotechnology and the Emphatic Computer

People show their emotions in many diverse and specialized ways, some of which a computer can be programmed to detect. By employing nanotechnology, a camera and image analysis software, some computers are able to observe a user’s body language and, with proper programming can accurately interpret a person’s posture, restlessness and various facial expressions like grimacing, smiling or scowling. Nanotechnology advances provide onboard sensors which can monitor heartbeats, breathing rates, fluctuations in blood pressure, and other subtle body changes such as skin temperature and voice inflection.

Because human skin has the capability of transmitting electric signals which can be utilized as a method of transmission, nanotechnology researchers have already been able to develop computers that are designed with nano sensors that have the uncanny ability to actually ‘see’ and ‘hear’ the people using them. Inevitably it is only a matter of time until the technology is available to create a computer that can readily identify whether their users are in high spirits or in a bad mood.

With ever advancing nanotechnology equipped computers, scientists figure it is entirely possible to develop a computer that is able to interpret a user’s mood via input it receives based on body language, voice tone and facial expressions and that it will be programmed to adjust itself by providing images designed to provide a feeling of comfort and serenity. Since emotions are ambiguous, transient and ultimately difficult to interpret, it would be very difficult for a computer to accurately construe the many human mood variances, regardless of how advanced the nanotechnology utilized. Therefore, in order to operate with any modicum of precision, a user would have to input the required data in advance.

Nanotechnology, with its sensor based abilities, gives programmers little problem with ‘intelligence’ based activities such as diagnosing a medical condition or participating in a game of chess, yet even with the major advancements in nanotechnology in recent years it is still somewhat of a challenge to design computers that accurately simulate human sight, audio functions, language interpretation and/or motor control.

Human vision and other sensory perceptions have evolved over billions of years and the how and why of their operations are still difficult to understand and/or simulate, while things like mathematics are explicitly taught and are, therefore, easier to express in a computer program.

Programmers are also attempting to employ nanotechnology advancements into programs that they expect to be able to accurately determine a person’s innate wishes regarding resuscitation should they fall ill and not be able to make that decision for themselves. Although, theoretically this information would be beneficial to medical teams, caution should be exercised whenever we allow a machine to determine matters relative to ethics. Regardless of the technology involved, machines are not equipped to differentiate between what is intrinsically right or wrong.