GAS HYDRATE FORMATION IN COLLOIDAL MATRICES .1. A DIELECTRIC-SPECTROSCOPY AND NMR SELF-DIFFUSION STUDY OF THE MODEL SYSTEM TRICHLOROFLUOROMETHANE WATER NONIONIC SURFACTANT | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

7971306

Reference Type

Journal Article

Title

GAS HYDRATE FORMATION IN COLLOIDAL MATRICES .1. A DIELECTRIC-SPECTROSCOPY AND NMR SELF-DIFFUSION STUDY OF THE MODEL SYSTEM TRICHLOROFLUOROMETHANE WATER NONIONIC SURFACTANT

Author(s)

Fordedal, H; Holt, O; Sjoblom, J

Year

1994

Is Peer Reviewed?

Yes

Journal

Journal of Dispersion Science and Technology
ISSN: 0193-2691
EISSN: 1532-2351

Volume

Issue

Page Numbers

465-486

Language

English

DOI

10.1080/01932699408943570

Web of Science Id

WOS:A1994NQ27700005

Abstract

The hydrocarbon rich phase (L2) of the system trichlorofluoromethane CCl3F/water (electrolyte)/nonionic surfactant has been investigated by means of NMR self-diffusion measurements, and dielectric spectroscopy. The dielectric spectra were recorded between 50 MHz and 5 GHz and fitted to a Cole-Cole model function with an additional Debye term. The main relaxation was due to a polarization inside the aqueous droplets (Maxwell-Wagner-Sillars relaxation). The NMR self-diffusion data display a low molecular self-diffusion for both water and surfactant over a broad interval consistent with a droplet structure. However at the highest CCl3F concentrations the rapid diffusion of the nonionic surfactant reveals that the aqueous droplets are most likely stabilized by means of gas hydrates at the w/o microemulsion interface.