Exchange of solubilized water and aqueous electrolyte solutions between micelles in apolar media

Eicke, Hans‐Friedrich; Shepherd, John C. W.; Steinemann, A.

doi:10.1016/0021-9797(76)90159-4

Cited by 168 publications

(69 citation statements)

References 8 publications

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“…Probably this is due to the stronger curvature of the surfactant interface at w, = 10. Experiments with a small probe (Tb3+) and a small quencher (Mn2+) [28] which do not affect the size of the micelles might confirm this view.…”

Section: Discussionmentioning

confidence: 86%

Triplet-state kinetics of Zn-porphyrin cytochrome c in micellar media. Measurement of intermicellar exchange rates

Vos¹,

Lavalette²,

Visser³

1987

Eur J Biochem

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The interactions of protein molecules with surfactant assemblies in aqueous and hydrocarbon media have been studied via the triplet-state kinetics of Zn-porphyrin cytochrome c in solutions containing an anionic [sodium bis(2-ethylhexyl)sulfosuccinate, AOT] or a cationic (cetyltrimethylammonium bromide, CTAB) surfactant.In aqueous solution, the observed triplet state decay is single exponential with a lifetime of 8 ms.In aqueous solutions of AOT and in AOT-reversed micellar solutions, biexponential triplet state decays were observed, indicating that interactions between the surfactant and the protein occur, resulting in a change in protein conformation near the porphyrin ring.In CTAB-reversed micellar solutions, quenching of the Zn-porphyrin cytochrome c triplet state by ferricyanide and methyl viologen was studied. Because the quenching is exchange-limited under the conditions used, the exchange rate constants for the water pools can be obtained from these experiments. The observed exchange rate constants are in the range of (1 -5) x lo7 M-'s-' , depending on the water content of the reversed micelles and on the type of quencher used. These values are three orders of magnitude lower than the calculated collision rate of the reversed micelles.

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Section: Discussionmentioning

confidence: 86%

Triplet-state kinetics of Zn-porphyrin cytochrome c in micellar media. Measurement of intermicellar exchange rates

Vos¹,

Lavalette²,

Visser³

1987

Eur J Biochem

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“…In water-in-oil microemulsions, the aqueous droplets continuously collide, coalesce and break apart resulting in a continuous exchange of solute content [32,56]. The collision process depends upon the diffusion of the aqueous droplets in the continuous media, i.e.…”

Section: Reactions In Microemulsionsmentioning

confidence: 99%

“…These two microemulsions are then mixed under constant stirring. Due to the frequent collisions of the aqueous cores of water-in-oil microemulsions [32,56], the reacting species in mieroemulsions I and II come in contact with each other. This leads to the precipitation of barium-ironcarbonate within the nano-size aqueous droplets of the mieroemulsion.…”

Section: A Synthesis Of Barium Ferritementioning

confidence: 99%

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Pillai

Kumar

Hou

et al. 1995

Advances in Colloid and Interface Science

249

121

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“…These two micro-emulsions were then mixed under constant stirring. Due to the frequent collisions of aqueous cores of water-in-oil micro-emulsions, the reacting species in the two micro-emulsions came in contact with each other, leading to the precipitation of Fe within the aqueous micro-droplets of the microemulsion [8]. Since the two micro-emulsions were of identical compositions, differing only in the nature of the aqueous phases, the micro-emulsion did not destabilize upon mixing.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and heating effect of iron/iron oxide composite and iron oxide nanoparticles

et al. 2007

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Fe/Fe oxide nanoparticles, in which the core consists of metallic Fe and the shell is composed of Fe oxides, were obtained by reduction of an aqueous solution of FeCl 3 within a NaBH 4 solution, or, using a water-in-oil micro-emulsion with CTAB as the surfactant. The reduction was performed either in an inert atmosphere or in air, and passivation with air was performed to produce the Fe/Fe 3 O 4 core/shell composite. Phase identification and particle size were determined by X-ray diffraction and TEM. Thermal analysis was performed using a differential scanning calorimeter. The quasistatic magnetic properties were measured using a VSM, and the specific absorption rates (SARs) of both Fe oxide and Fe/Fe 3 O 4 composite nanoparticles either dispersed in methanol or in an epoxy resin were measured by Luxtron fiber temperature sensors in an alternating magnetic field of 150 Oe at 250 kHz. It was found that the preparation conditions, including the concentrations of solutions, the mixing procedure and the heat treatment, influence the particle size, the crystal structure and consequently the magnetic properties of the particles. Compared with Fe oxides, the saturation magnetization (M S ) of Fe/Fe 3 O 4 particles (100-190 emu/g) can be twice as high, and the coercivity (H C ) can be tunable from several Oe to several hundred Oe. Hence, the SAR of Fe/Fe 3 O 4 composite nanoparticles can be much higher than that of Fe oxides, with a maximum SAR of 345 W/g. The heating behavior is related to the magnetic behavior of the nanoparticles.

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Exchange of solubilized water and aqueous electrolyte solutions between micelles in apolar media

Cited by 168 publications

References 8 publications

Triplet-state kinetics of Zn-porphyrin cytochrome c in micellar media. Measurement of intermicellar exchange rates

Triplet-state kinetics of Zn-porphyrin cytochrome c in micellar media. Measurement of intermicellar exchange rates

Preparation of nanoparticles of silver halides, superconductors and magnetic materials using water-in-oil microemulsions as nano-reactors

Synthesis and heating effect of iron/iron oxide composite and iron oxide nanoparticles

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