Calcium surfactants: a review

Zapf, A; Beck, R.; Platz, G.; Hoffmann, H.

doi:10.1016/s0001-8686(02)00065-9

Cited by 57 publications

(54 citation statements)

References 94 publications

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“…The structures of anionic surfactant gels have been studied by SEM, XRD, and optical microscopy in the presence of metal ions [15,[28][29][30][31]. The lamellar structure was reported for divalent metal ions such as copper, which was a counter ion to DS -in the metal extraction method.…”

Section: Discussionmentioning

confidence: 99%

“…The Krafft temperature of 50°C for calcium dodecyl sulfate gave an insoluble precipitate with a solubility product of only 3.7 × 10 -10 at ambient temperature [15]. Therefore, when calcium nitrate (0.035 mol dm…”

Section: Separation Of Copper and Zinc In A Brass Alloymentioning

confidence: 99%

“…In concentrated solutions, amphiphilic molecules such as ionic surfactants can form a bilayer, which consist of a flat phase that includes some solvent in the interior [15]. The micellar solution exhibits the property of being separated into two phases upon cooling below the Krafft temperature or upon the addition of salts.…”

Section: Saxrd Analysis Of the Surfactant Phases With Nacl Or Kcl As mentioning

confidence: 99%

“…The layer distance calculated from the Bragg [17,18]. These temperatures are dependent on the conditions; for example, the Krafft temperature has been reported in the range 7-17°C for SDS [15,19,20]. Since the Krafft temperature of SDS is lower than room temperature, SDS melted and KDS deposited in the solution.…”

Section: Saxrd Analysis Of the Surfactant Phases With Nacl Or Kcl As mentioning

confidence: 99%

See 3 more Smart Citations

Surfactant Gel Extraction of Metal Ammine Complexes using SDS and KCl at Room Temperature, and a Small-angle X-ray Diffraction Study of the Surfactant Phase

Shoji

Ichimaru

Nozaki

et al. 2013

SERDJ

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Section: Discussionmentioning

confidence: 99%

Section: Separation Of Copper and Zinc In A Brass Alloymentioning

confidence: 99%

Section: Saxrd Analysis Of the Surfactant Phases With Nacl Or Kcl As mentioning

confidence: 99%

Section: Saxrd Analysis Of the Surfactant Phases With Nacl Or Kcl As mentioning

confidence: 99%

See 2 more Smart Citations

Surfactant Gel Extraction of Metal Ammine Complexes using SDS and KCl at Room Temperature, and a Small-angle X-ray Diffraction Study of the Surfactant Phase

Shoji

Ichimaru

Nozaki

et al. 2013

SERDJ

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“…This behaviour closely resembles the formation of visco-elastic films at the crude oil/brine interfaces. The physical properties of calcium surfactants are the topics of a recent review article (Zapf et al, 2003). There have been many studies of the effect of interfacial film properties on the snap-off of oil blobs in porous media during the course of water-flooding (Chatzis et al, 1983;Laidlaw & Wardlaw, 1983;Yu & Wardlaw, 1986).…”

Section: Introductionmentioning

confidence: 99%

Spreading and Retraction of Spilled Crude Oil on Sea Water

Takamura¹,

Loahardjo²,

Winoto³

et al. 2012

Crude Oil Exploration in the World

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Metal Soap Membranes for Gas Separation

Liu

Babu

Hao

et al. 2020

Adv Funct Materials

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Metal soaps or metal alkanoates are metal–organic complexes held together with metal cations and the functional groups of hydrocarbon chains. They can be synthesized at a high yield by simply mixing the metal and organic sources, forming crystalline frameworks with diverse topology, and have been studied in the past because of their rich polymorphism‐like liquid crystals. Their ability to melt while retaining the crystalline properties upon cooling is unique among nanoporous materials and is especially attractive for membrane fabrication. Herein, metal soaps as a new class of material for molecular separation are reported. Three metal soaps, Ca(SO4C12H25)2, Zn(COOC6H13)2, and Cu(COOC9H19)2, hosting lamellar structure with molecular‐sized channels are synthesized. They are processed in thin, intergrown, polycrystalline films on porous substrates by two scalable methods, interfacial crystallization and melting with an extremely small processing time (a minute to an hour). The resulting crystalline films are oriented with the alkyl chains perpendicular to the porous substrate which favors molecular transport. The prepared membranes demonstrate attractive gas separation behavior, e.g., 300‐nm‐thick Ca(SO4C12H25)2 membrane prepared in a minute using interfacial crystallization yields H2 permeance of 6.1 × 10−7 mol m−2 s−1 Pa−1 with H2/CO2 selectivity of 10.5.

show abstract

Calcium surfactants: a review

Cited by 57 publications

References 94 publications

Surfactant Gel Extraction of Metal Ammine Complexes using SDS and KCl at Room Temperature, and a Small-angle X-ray Diffraction Study of the Surfactant Phase

Surfactant Gel Extraction of Metal Ammine Complexes using SDS and KCl at Room Temperature, and a Small-angle X-ray Diffraction Study of the Surfactant Phase

Spreading and Retraction of Spilled Crude Oil on Sea Water

Metal Soap Membranes for Gas Separation

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