Structure and temperature dependence of fatty acid Langmuir-Blodgett films studied by neutron and X-ray scattering

Buhaenko, M.R.; Grundy, M.J.; Richardson, Robert M.; Roser, Stephen J.

doi:10.1016/0040-6090(88)90637-2

Cited by 70 publications

(20 citation statements)

References 5 publications

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“…Small variations in the effective pH of the subphase lead to changes in the concentration of the cations on the liquid surface which in turn affects the structure of the deposited film. 37 The observation that different substrates lead to different structural arrangements under identical deposition conditions can only be understood by assuming that the nature of the substrate surface has a strong influence on the local pH of the sub- FIG. 6.…”

Section: Discussionmentioning

confidence: 99%

Structural assembly of Cd-arachidate molecules in multilayers

Vitta

Metzger

Major

1999

The Journal of Chemical Physics

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The three-dimensional ͑vertical and lateral͒ structure of Cd-arachidate multilayers prepared on two different substrates, glass and silicon, is studied simultaneously by grazing incidence x-ray reflection/diffraction. The grazing incidence reflectivity studies indicate the formation of a well-ordered layered structure on both the substrates. The reflectivity simulations show that the bilayer spacing in the case of a glass substrate is 5.54 nm while that on a silicon substrate is only 5.44 nm, indicating a vertical tilt of the Cd-arachidate molecules on a glass substrate by about 9.5°. The interface roughness is found to be 0.3 nm for multilayers on a glass substrate and 0.4 nm on the silicon substrate. The interface topography, determined by studying the nonspecular scattering behavior, is found to be replicated between the various interfaces in the multilayers, independent of the type of substrate. The lateral topography of the interfaces in multilayers on a glass substrate shows a self-affine nature with no lateral length limit for the roughness fluctuations. The interfaces in multilayers on a silicon substrate, however, exhibit a saturation behavior for the roughness fluctuations. In the plane of the multilayers the Cd-arachidate molecules on a glass substrate have a centered rectangular lattice arrangement while they have a distorted hexagonal lattice arrangement on a silicon substrate.

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Section: Discussionmentioning

confidence: 99%

Structural assembly of Cd-arachidate molecules in multilayers

Vitta

Metzger

Major

1999

The Journal of Chemical Physics

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“…In addition, stabilization of the mixed 2-DCPP/AA LB films can be enhanced by the addition of divalent ions in the subphase. It has also been reported that the divalent cations dramatically improve the film stability during deposition because they interact with arachidic acid to form a "di-soap," which enhances the film stability [17,[26][27][28][29][30]. Chen and Liu [17] studied the effects of the addition of cations in AA LB films.…”

Section: Resultsmentioning

confidence: 96%

Dicyanopyrazine-linked porphyrin Langmuir–Blodgett films

Kang

Ahn

2008

Journal of Colloid and Interface Science

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“…The mean molecular area increases by about 10-20% with the addition of ions compared to the solution of AA in de-ionized water; whereas the increase in the "collapse pressure" is not as dramatic. Previous studies [16][17][18][19][20][21][22][23] have attributed the lowering of transition pressure with added salt to the so-called "soap effect." When barium ions are added to the acid, they interact with the fatty acid through electrostatic attraction.…”

Section: Resultsmentioning

confidence: 98%

“…It has been observed that the transfer of Langmuir film from the gas-liquid interface onto a solid substrate is dependent on the characteristics of the sub-phase, solid substrate and deposition speed [12][13][14][15]. Previous studies [16][17][18][19][20][21][22][23] have revealed that divalent ions interact with arachidic acid (AA) and stearic acid (SA) in each layer to form "di-soap," which could enhance film stability. Petrov et al [24] found that the LB film deposition speed of arachidic acid could be improved with the presence of cadmium ions.…”

Section: Introductionmentioning

confidence: 98%