Electron spin-echo modulation of x-doxylstearic acid in nonionic surfactants

Journal Article · Thu Jul 13 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100351a048· OSTI ID:7197282

Baglioni, P ^[1]; Bongiovanni, R ^[2]; Rivara-Minten, E; Kevan, L ^[3]

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1. Univ. of Udine (Italy)
2. ENI Group, Milan (Italy)
3. Univ. of Houston, TX (USA)

Electron spin-echo studies have been carried out for a series of x-doxylstearic acid spin probes (x-DSA, x = 5, 7, 10, 12, and 16) in frozen micellar solutions of some poly(ethylene oxide) surfactants, C{sub 12}E{sub 6}, C{sub 12}E{sub 8}, C{sub 8}E{sub 6}, and C{sub 8}E{sub 8}, and in surfactants selectively deuterated along the aliphatic chain or in the poly(ethylene oxide) groups, (CD){sub 12}E{sub 6}, C{sub 12}D{sub 6}, C{sub 8}D{sub 6}, and (CD){sub 12}E{sub 8}, in D{sub 2}O and H{sub 2}O. Modulation effects due to interactions of nitroxide groups with water deuteriums or deuteriums of deuterated surfactants have been measured as a function of x. The probes are mainly located in the micelle ethylene oxide region. The average probe location in the micelle as a function of x is reported. The results obtained show that no water penetration inside the micelle core and little water penetration into the ethylene oxide region are present and do not support the current view of a fully hydrated ethylene oxide chain. It is found that only one or two ethylene oxide groups are hydrated.

• OSTI ID: 7197282
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:14; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400201 -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
DATA
DATA ANALYSIS
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
INFORMATION
ISOTOPE EFFECTS
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
RESONANCE
SURFACTANTS