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Klgn
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Untersuchte Arbeit:
Seite: 63, Zeilen: 1-17
Quelle: Bhattacharya et al. 2008
Seite(n): 307; 308, Zeilen: 307: 9 ff.; 308: 1 ff.
5.4. Spectroscopic technique [240, 241]

Spectral techniques are generally used to probe the chemical make-up of macromolecular materials such as functional groups, structural conformation and component concentration. The main spectral techniques applied in polymer nanocomposite research are Fourier transform infra-red spectroscopy (FTIR), nuclear magnetic resonance (NMR) and ultraviolet (UV) spectroscopy.

[Figure]

Figure 5.3 EM Spectrum showing the range of frequencies and wavelength of radiation.

Spectral techniques involve the interaction of molecules of a specimen or sample with electromagnetic (EM) radiation. It essentially monitors changes in energy states of molecules in response to EM radiation. Figure 5.3 shows the EM spectrum and the corresponding wavelength of the various radiations. Important is to understand the energy state of molecules when EM radiation is observed. Basically, when an atom or a molecule absorbs energy, it proceeds from the initial or ground state to a higher or excited state. These energy states are said to be quantumized and a particular value exists for each state. This could be related to the “spinning” of the sub-atomic particles, vibration of the chemical bonds, and so on.

Fourier transform infra-red spectroscopy (FTIR)

FTIR is a technique that utilizes the vibration response of molecules when exposed to infrared (IR) radiation.

[page 307]

6.4 Spectroscopic Techniques

Spectral techniques are generally used to probe the chemical make-up of macromolecular materials, such as functional groups, structural conformation, and component concentrations. The main spectral techniques applied in polymer nanocomposite research are Fourier

[page 308]

transform infra-red spectroscopy (FTIR), nuclear magnetic resonance (NMR), and ultraviolet (UV) spectroscopy. This section will outline these methods and review some studies from literature.

[Figure]

Figure 6.46: EM spectrum showing the range of frequencies and wavelength of radiation. The shaded region is that of visible light

Spectral techniques involve the interaction of molecules of a specimen or sample with electromagnetic (EM) radiation. It essentially monitors changes in energy states of molecules in response to EM radiation. Figure 6.46 shows the EM spectrum and the corresponding wavelengths of the various radiations. Of particular importance is to understand the energy “states” of molecules when EM radiation is absorbed. Basically, when an atom or molecule absorbs energy, it proceeds from the initial or ground state to a higher or excited state. These energy states are said to be quantized and a particular value exists for each state. This could be related to the “spinning” of the nucleus, vibration of the bonds, and so on. [...]

6.4.1 Fourier Transform Infra-Red (FTIR) Spectroscopy

FTIR is a technique that utilizes the vibrational response of molecules when exposed to infrared (IR) radiation.

Anmerkungen

The text and the figures are from different sources: The text is from Bhattacharya et al. 2008, the figures in the dissertation are edited versions of figures from the Wikimedia Commons http://commons.wikimedia.org/wiki/File:EM_spectrum.svg?uselang=en. There is no source for either the text or the figures given.

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(Klgn), SleepyHollow02

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