2005
DOI: 10.1063/1.1865952
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Temperature dependence of interfacial fluctuations of polymerized fatty acid salt multilayers

Abstract: X-ray scattering was used to study the temperature dependence of the profile structure of polymerized 10,12-tricosadiynoic acid salt multilayers. The stacking periodicity of the multilayers was found to decrease with increasing temperature due to the conformational changes of the alkyl chains. When the samples were fully hydrated in water, the reflectivity measurement showed that the thermal fluctuations of the interfaces are enhanced with temperature, resulting in reduced ordering. Meanwhile, the diffuse scat… Show more

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Cited by 10 publications
(12 citation statements)
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“…The electron density profiles (EDP) of the lipid bilayers in different phases can be reconstructed using a method proposed by Salditt et al , Briefly, the EDP of a bilayer can be refined from the X-ray diffraction data via normalρ false( z false) = 1 M f ( q m ) cos ( 2 π m z / d ) where f ( q m ) is the form factor of the bilayer, d is the interbilayer distance of the multilamellar membrane system, and m running from 1 to M is the index of the Bragg peaks. The magnitudes of f ( q m ) are determined from the intensities of the Bragg peaks, I ( q ) | 0 N f n e i q n d | 2 / q 2 where f 0 = f s is the reflection of the substrate and f n = f ( q )exp(− idq /2).…”
Section: Resultsmentioning
confidence: 99%
“…The electron density profiles (EDP) of the lipid bilayers in different phases can be reconstructed using a method proposed by Salditt et al , Briefly, the EDP of a bilayer can be refined from the X-ray diffraction data via normalρ false( z false) = 1 M f ( q m ) cos ( 2 π m z / d ) where f ( q m ) is the form factor of the bilayer, d is the interbilayer distance of the multilamellar membrane system, and m running from 1 to M is the index of the Bragg peaks. The magnitudes of f ( q m ) are determined from the intensities of the Bragg peaks, I ( q ) | 0 N f n e i q n d | 2 / q 2 where f 0 = f s is the reflection of the substrate and f n = f ( q )exp(− idq /2).…”
Section: Resultsmentioning
confidence: 99%
“…The EDP can be obtained by theoretical simulation of the diffraction data where f ( q m ) is the form factor of the bilayer, d is the period of the multilayer, and m running from 1 to M is the index of the Bragg peaks . The magnitudes of f ( q m ) are determined from the intensities at the Bragg peaks, where f 0 = f S is the reflection of the substrate and f n = f ( q ) exp(− idq /2).…”
Section: Resultsmentioning
confidence: 99%
“…The magnitudes of f ( q m ) are determined from the intensities at the Bragg peaks, where f 0 = f S is the reflection of the substrate and f n = f ( q ) exp(− idq /2). Due to the mirror plane symmetry of the bilayers, the phases of f ( q m ) are reduced to their positive/negative signs only, facilitating the phase problem enormously . The method has been widely used to refine the structure of phospholipid bilayers.…”
Section: Resultsmentioning
confidence: 99%
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“…Due to the mirror plane symmetry of the bilayers, the phases of f͑q z,m ͒ are reduced to their positive/ negative signs only, facilitating the phase problem. 13,24,25 …”
Section: Methodsmentioning
confidence: 99%