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Introduction

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People have been studying and working with nanoparticles for centuries, but the effectiveness of their efforts has been hugely hampered by respective inability to analyze the structure of nanoparticles. In recent decades the development of novel microscopy and spectroscopy techniques capable of analyzing particles as small as atoms has enabled scientists actually to see what they are working with and thus more rational research.

Scale of things

The ability to produce and rationally modify nano-sized materials has opened up a diversity of new possibilities in almost all industries and scientific endeavors. Since nanotechnology is essentially a set of techniques that allow manipulation of properties at a very small scale, nanoparticle-based materials have many applications, such as the ones presented below.

Application of nanoparticles

As the market for nanoparticles in high-tech areas continues to expend, the demand for nanoparticles with a well-defined size and/or shape in high volumes and a low cost continues to increase. The large specific surface area of nanoparticles is the origin of a number of their unique applications. Coating or chemical modifying of variaty of nanoparticles is common practice and an area where, new, valuable, innovations are likely to be seen. The surface modification can be for purposes of:

Most commonly used surface modification methods include grafting thiolated surfactants or polymers, adsorption of charged surfactants, charged ligands or polymer brushes, attachment of biological molecules such as DNA, proteins, antigens or coating a continuous polymer film on nanoparticles.

General structure of nanoparticle

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