High-resolution x-ray scattering measurements: I. Surfaces

Daillant, Jean; Alba, M.

doi:10.1088/0034-4885/63/10/203

Cited by 84 publications

(71 citation statements)

References 267 publications

(413 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We then treat the bilayer as a weak perturbation. 53 Within this approximation, the diffuse scattering cross section ͑intensity scattered per unit solid angle ⍀ in the direction k sc per unit of incident flux in the direction k in ͒ ͑see Fig. 15͒ 20,54 This perturbation is related to the electronic density correlation function ͗␦͑r͒␦͑rЈ͒͘ and originates from electrondensity lateral heterogeneities: this can, for instance, result from the presence of pores 55 or domains after phase separation.…”

Section: Direct Study Of the Fluctuation Spectrum By X-ray Scatteringmentioning

confidence: 99%

Fluctuations and destabilization of single phospholipid bilayers

2008

View full text Add to dashboard Cite

Supported phospholipid bilayers are interesting model systems for biologists and present fascinating physical properties. The authors present an extensive experimental study of the dynamic properties of supported bilayers. The structure and the equilibrium properties of single and double supported bilayers were investigated with neutron reflectivity. The submicronic fluctuation spectrum of a nearly free "floating" bilayer was determined using off-specular x-ray scattering: the surface tension of the bilayer, its bending modulus, and the intermembrane potential could be determined. Using fluorescence microscopy, the authors showed that this well-controlled single bilayer can form vesicles. Destabilization occurred either at the main gel-fluid transition of the lipids and could be interpreted in terms of a decrease in the bending rigidity or under an ac low-frequency electric field applied in the fluid phase. In the latter case, the authors also studied the effect of the electric field at the molecular length scale by neutron reflectivity. In both cases, destabilization leads to the formation of relatively monodisperse vesicles. This could give further understanding on the vesicle formation mechanism and on the parameters that determine the vesicle size.

show abstract

Section: Direct Study Of the Fluctuation Spectrum By X-ray Scatteringmentioning

confidence: 99%

Fluctuations and destabilization of single phospholipid bilayers

2008

View full text Add to dashboard Cite

show abstract

“…In the case of GIXD, however, fewer reports exist on multiple-scattering events, although the peak positions can be significantly influenced by refraction effects of the X-rays (Breiby et al, 2008;Toney & Brennan, 1989). The theoretical treatment of X-ray scattering from thin films taking into account multiple scattering from surfaces can be performed using the distorted wave Born approximation (Daillant & Alba, 2000;Lazzari, 2009).…”

Section: Introductionmentioning

confidence: 99%

Multiple scattering in grazing-incidence X-ray diffraction: impact on lattice-constant determination in thin films

Resel

Bainschab

Pichler

et al. 2016

J Synchrotron Radiat

View full text Add to dashboard Cite

Dynamical scattering effects are observed in grazing-incidence X-ray diffraction experiments using an organic thin film of 2,2 0 :6 0 ,2 00 -ternaphthalene grown on oxidized silicon as substrate. Here, a splitting of all Bragg peaks in the out-ofplane direction (z-direction) has been observed, the magnitude of which depends both on the incidence angle of the primary beam and the out-of-plane angle of the scattered beam. The incident angle was varied between 0.09 and 0.25 for synchrotron radiation of 10.5 keV. This study reveals comparable intensities of the split peaks with a maximum for incidence angles close to the critical angle of total external reflection of the substrate. This observation is rationalized by two different scattering pathways resulting in diffraction peaks at different positions at the detector. In order to minimize the splitting, the data suggest either using incident angles well below the critical angle of total reflection or angles well above, which sufficiently attenuates the contributions from the second scattering path. This study highlights that the refraction of X-rays in (organic) thin films has to be corrected accordingly to allow for the determination of peak positions with sufficient accuracy. Based thereon, a reliable determination of the lattice constants becomes feasible, which is required for crystallographic structure solutions from thin films.

show abstract

“…[21][22][23][24][25][26][27] The vertical structure of the samples was investigated by x-ray reflectometry. All these techniques are well suited for the characterization of mesoscopic and nanoscopic structures of polymer materials at the interface [21][22][23][24][25][26][27] and will allow us to understand the basis of the excellent suitability of cellulose films as supports for native and artificial lipid membranes.…”

Section: Introductionmentioning

confidence: 99%

Structures of regenerated cellulose films revealed by grazing incidence small-angle x-ray scattering

et al. 2008

View full text Add to dashboard Cite

The characteristic in-plane length scales of ultrathin films of regenerated cellulose are measured using noncontact atomic force microscopy (NC-AFM) and grazing incidence small-angle x-ray scattering (GISAXS) in ambient atmosphere and under various humidity conditions. The aim is to elucidate the structural basis for the excellent compatibility of cellulose supports to planar lipid membranes. Films are deposited on silicon wafers by Langmuir-Blodgett (LB) transfer and spin coating. NC-AFM height profiles and the resulting calculated power spectral density functions indicate that both kinds of cellulose films have almost identical root-mean-square roughness values (0.7–0.8 nm) and very similar characteristic length scales (32 nm), respectively. GISAXS measurements, both above and below the critical angle of total external reflection, show that the dominant length scales in the bulk and near the surface of the films are comparable (∼50 nm). The origin of these length scales can be attributed to the bundle of rodlike molecules of cellulose that result during the regeneration process (i.e., as a consequence of the cleavage of the silyl side chains of trimethylsilylcellulose). Exposure of the cellulose samples to various humidities shows that above a relative humidity of 97% a significant swelling of the films occurs, which is consistent with our previous findings. The swelling of films with more than 30 LB monolayers of cellulose induces a remarkable out-of-plane rearrangement of the cellulose bundles, due to a reduced influence of the solid substrate compared to thinner films with only eight to ten LB monolayers.

show abstract

High-resolution x-ray scattering measurements: I. Surfaces

Cited by 84 publications

References 267 publications

Fluctuations and destabilization of single phospholipid bilayers

Fluctuations and destabilization of single phospholipid bilayers

Multiple scattering in grazing-incidence X-ray diffraction: impact on lattice-constant determination in thin films

Structures of regenerated cellulose films revealed by grazing incidence small-angle x-ray scattering

Contact Info

Product

Resources

About