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Nmr (nuclear magnetic resonance) spectroscopy
| Глоссарий терминов в нанотехнологиях |
Analytical technique used to determine the structure of molecules. in nmr, the molecule is placed within a strong magnetic field to align the atomic nuclei. an oscillating electromagnetic field is applied, and the radiation absorbed or emitted by the molecule is measured. not all atoms can be detected using nmr because the nuclei must have non-zero magnetic moments.
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Analytical, английский
Аналитический
Electromagnetic, английский
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Noncovalent interactions, английский
Interactions first recognized by j. d. van der waals in the nineteenth century. in contrast to the covalent interactions, noncovalent interactions are weak interactions that bind together different kinds of building blocks into supramolecular entities. also referred to as van der waals interactions.
Nanotubes, английский
Long, thin cylinders of carbon, discovered in 1991 by s. iijima. these large macromolecules are unique for their size, shape, and remarkable physical properties. they can be thought of as a sheet of graphite (a hexagonal lattice of carbon) rolled into a cylinder. the physical properties are still being discovered. nanotubes have a very broad range of electronic, thermal, and structural properties that change depending on the different kinds of nanotube (defined by its diameter, length, and chirality, or twist). to make things more interesting, besides having a single cylindrical wall (single walled nanotubes or swnts), nanotubes can have multiple walls (mwnts)–cylinders inside the other cylinders. usually referred to as carbon nanotubes, also known as nanorods. applications for carbon nanotubes include high-density data storage, nanoscale electronics, and flexible solar cells.
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