Four-wave mixing spectroscopy of hydration layers in biopolymers and carbon nanotubes aqueous solutions
✍ Scribed by A.F. Bunkin; S.M. Pershin
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 161 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0377-0486
- DOI
- 10.1002/jrs.2212
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✦ Synopsis
Abstract
We have studied the water spectrum modification in the presence of biomolecules (protein, DNA) and single wall carbon nanotube (SWNT) at low concentration, ∼10 mg/ml and ∼0.1 µg/ml respectively, by four‐wave mixing (FWM) spectroscopy in the ranges 0.1–10 cm^−1^ and 75–95 cm^−1^. A comparison of distilled water and aqueous solutions' FWM spectra shows a considerable growth in the intensity of low wavenumber Raman modes in solution. These modes are attributed to rotational transitions of H~2~O and H~2~O~2~ molecules. It was established that in the biopolymer's aqueous solutions the ortho‐isomer rotational lines' intensity increases by a factor of ∼6. In contrast, the para‐isomer's lines are considerably suppressed. In the SWNT suspension the spin‐selective interaction was not observed. The shifting of Brillouin resonances in the opposite direction in biomolecules and SWNT suspension in comparison with water was observed and discussed. Copyright © 2009 John Wiley & Sons, Ltd.