Nano Science (Lec4 Bottom-up Nanofabrication)

Nano Science (Lec4 Bottom-up Nanofabrication) - MAE 287/EE...

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Unformatted text preview: MAE 287/EE 257 Nanofabrication is about how to make structures at nanoscale. There are two general strategies for nanofabrication, Top-down nanofabrication starts with large structures that are subsequently reduced to nano structure by physical, chemical, and mechanical, etc. processes. Bottom-up nanofabrication starts with atoms and molecules that react under physical, chemical, or biological environment to form nano structures. Nano Science (MAE298) A nanoparticle can be defined as one having at least one dimension in the nanometre regime (1 100 nm), and can be further classified according to its chemical composition, cohesive energy, hardness, opto-electronic properties, and so on. SEM image of main-chain polyether nanoparticles ( a ); TEM image of 60-nm gold nanosphere ( b ); TEM image of Au nanorod ( c ); TEM image of cubic Pt nanocrystal oriented along [001] ( d ); SEM image of Ag bipyramids approximately 150 nm in edge length ( e ); a schematic micelle ( f ) and a cryo-TEM image of evolving vesicles ( g ). TEM image of PbSe nanowire formed in the presence of oleic acid and n-tetradecylphosphonic acid ( h ); schematics of actin ( i ) and surfactant or lipid bilayer ( j ); TEM images of microtubules. mo , Two or more components (coreshell structures and so on). Nature Materials 7 , 527 - 538 (2008) Stained glass window at church is due to embedded gold nanoparticles of different sizes. Change of the color of Au nanoparticle solution vs the nanoparticle sizes due to light scattering. As the scale of nanoparticle became nano size, outstanding optical, electrical and magnetic properties which are not known in micro scale metal materials are found. Therefore, many research groups in the world have been studying on nanoparticle projects for the application of non- volatile memory, bio material and next generation energy material. The drug is dissolved, entrapped, encapsulated or attached to a nanoparticles and depending upon the method of preparation, nanoparticles, nanospheres or nanocapsules can be obtained. Nanocapsules are vesicular systems in which the drug is confined to a cavity surrounded by a nanoscale membrane, while nanospheres are matrix systems in which the drug is physically and uniformly dispersed. In recent years, biodegradable polymeric nanoparticles have attracted considerable attention as potential drug delivery devices in view of their applications in drug targeting to particular organs/tissues, as carriers of DNA in gene therapy, and in their ability to deliver proteins, peptides and genes through a per oral route of administration. In spite of development of various synthetic and semi synthetic nanoparticles , natural polymers still enjoy their popularity in drug delivery The applications of nanocomposites are composite materials, such as carbon nanotubes, clay nanoplatelets, and graphite nanoplatelets, have extensive applications in aerospace, aircraft, automotive, marine, energy, infrastructure, armor, biomedical, and recreational (sports). 0D Nanoparticle fabrication...
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Nano Science (Lec4 Bottom-up Nanofabrication) - MAE 287/EE...

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