Mobility Measurements in Microemulsion Gels (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Mobility Measurements in Microemulsion Gels (Articolo in rivista) (literal)

Anno

• 1988-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1021/j100323a036 (literal)

Alternative label

• D. Capitani, A. L. Segre, G. Hearing, P.L. Luisi (1988)
  Mobility Measurements in Microemulsion Gels
  in Journal of Physical Chemistry; American Chemical Society, Washington (Stati Uniti d'America)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• D. Capitani, A. L. Segre, G. Hearing, P.L. Luisi (literal)

Pagina inizio

• 3500 (literal)

Pagina fine

• 3504 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 92 (literal)

Rivista

• Journal of Physical Chemistry (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 5 (literal)

Note

• Scopus, ISI Web of Science (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Istituto di Metodologie Chimiche Institut fur Polymere, ETH-Zentrum, Zurich, Switzerland (literal)

Titolo

• Mobility Measurements in Microemulsion Gels (literal)

Abstract

• Gelatin can be solubilized in the water pool of water-in-oil microemulsions formed by AOT (bis(2-ethylhexyl) sodium sulfosuccinate) in isooctane and, under certain conditions, the whole system can be transformed in a transparent, stable gel. A partial physical chemical characterization of these gels is presented, based mostly on viscosity (energy dissipation) and NMR relaxation time measurements, with the aim of investigating the mobility and, more generally, the structure of these novel materials. The viscosity is very high, typical values ranging around 1000 P. However, when the molecular mobility is investigated by pulsed NMR spectroscopy, it is found that isooctane is characterized by TI ca. 1.695 s, a value which is very close to the value of the neat solvent. As far as the surfactant is concerned, NMR spectra are characterized by a very high resolution with relaxation times close to those found for AOT in liquid reverse micelles. 13C resonances of AOT suggest a picture of the surfactant in the gel phase, according to which the two ester moieties of the molecules assume a closed form. Gelatin, conversely, is highly rigid and cannot be properly studied by NMR spectroscopy. The chemical shift of the water signal is very similar to data previously published on micelles at very high water content (4.8 ppm); however, the line width in gels is larger by an order of magnitude and increases linearly with an increase in the gelatin content in the water phase. From all of these data taken together, in particular from the apparent contradiction between the high viscosity of the gel and the high mobility of the major component (hydrocarbon), a picture for these gels emerges, according to which very large droplets of organic solvents (400-2000 A in diameter in the rough assumption of spherical droplets) are entrapped by rigid gelatin networks. (literal)

Editore

• American Chemical Society (Editore)

Prodotto di

• Metodologie NMR per lo studio delle scienze omiche (PM.P06.019.003) (Modulo)
• Istituto di metodologie chimiche (IMC) (Istituto)

Autore CNR

• ANNA LAURA SEGRE (Unità di personale interno)
• DONATELLA CAPITANI (Unità di personale interno)

Incoming links:

Autore CNR di

• DONATELLA CAPITANI (Unità di personale interno)
• ANNA LAURA SEGRE (Unità di personale interno)

Prodotto

• Istituto di metodologie chimiche (IMC) (Istituto)
• Metodologie NMR per lo studio delle scienze omiche (PM.P06.019.003) (Modulo)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Journal of Physical Chemistry (Rivista)

Editore di

• American Chemical Society (Editore)