Surfactant Adsorption at the Metal-Oil Interface

被引：27

作者：

Campana, Mario ^{[1
]}

Teichert, Anke ^{[2
,5
,6
,7
]}

Clarke, Stuart ^{[3
]}

Steitz, Roland ^{[2
]}

Webster, John. R. P. ^{[4
]}

Zarbakhsh, Ali ^{[1
]}

机构：

[1] Univ London, Sch Biol & Chem Sci, London E1 4NS, England

[2] Helmholtz Zentrum Berlin Mat & Energie GmbH, D-14109 Berlin, Germany

[3] BP Inst, Bullard Labs, Cambridge CB3 0EZ, England

[4] Rutherford Appleton Lab, ISIS Neutron Facil, Sci & Technol Facil Council, Didcot OX11 0QX, Oxon, England

[5] Katholieke Univ Leuven, Inst Kern Stralingsfys, B-3001 Louvain, Belgium

[6] Katholieke Univ Leuven, INPAC, B-3001 Louvain, Belgium

[7] Katholieke Univ Leuven, Lab Vaste Stoffys Magnetisme, B-3001 Louvain, Belgium

来源：

LANGMUIR | 2011年 / 27卷 / 10期

关键词：

AIR/WATER INTERFACE; ADDITIVES; ANTIWEAR;

D O I：

10.1021/la200670w

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

The structure of the adsorbed palmitic acid at the iron oxide/oil interface has been investigated using polarized neutron reflectometry. The palmitic acid was found to be strongly adsorbed at the oxide/oil interface resulting in a monolayer of thickness 16 +/- 4 angstrom for 150 and 500 ppm palmitic acid concentrations (16 +/- 5 angstrom for the 1000 ppm solution). These layer thicknesses suggest tilt for the palmitic acid molecules with respect to the interface. The model also requires a second diffuse layer extending in the bulk oil. The thickness of this diffuse layer was 35 +/- 17 angstrom for the 150 ppm solution and 45 +/- 22 angstrom for 500 and 1000 ppm solution. The composition profiles at the interface suggest a depletion of the oil in the vicinity of the interface as the concentration of palmitic acid increases.

引用

页码：6085 / 6090

页数：6

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