Surfaces and interfaces characterization by neutron reflectometry

Ott, F.; Cousin, Fabrice; Menelle, A.

doi:10.1016/j.jallcom.2004.05.046

Cited by 10 publications

(5 citation statements)

References 55 publications

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“…Specular neutron reflectivity (NR) experiments were carried out on the time-of-flight reflectometer EROS at the Laboratoire Léon Brillouin, CEA Saclay, France . Two different geometries were used.…”

Section: Methodsmentioning

confidence: 99%

“…Specular neutron reflectivity (NR) experiments were carried out on the time-of-flight reflectometer EROS at the Laboratoire L eon Brillouin, CEA Saclay, France. 33 Two different geometries were used. For the as-prepared and dried after swelling samples, measurements were performed at the air/silicon interface and data were collected at an angle of 0.93°(Δθ/θ = 0.05°) with a neutron white beam covering wavelengths from 3 to 25 Å (Δλ/λ = 0.07), leading to an accessible k-range of 0.004-0.034 Å -1 .…”

Section: ' Introductionmentioning

confidence: 99%

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Amorphous Characteristics of an Ultrathin Cellulose Film

et al. 2011

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Swelling behavior and rearrangements of an amorphous ultrathin cellulose film (20 nm thickness) exposed to water and subsequently dried were investigated with grazing incidence X-ray diffraction, neutron reflectivity, atomic force microscopy, and surface energy calculations obtained from contact angle measurements. The film swelled excessively in water, doubling its thickness, but shrunk back to the original thickness upon water removal. Crystallinity (or amorphousness) and morphology remained relatively unchanged after the wetting/drying cycle, but surface free energy increased considerably (ca. 15%) due to an increase in its polar component, that is, the hydrophilicity of the film, indicating that rearrangements occurred during the film's exposure to water. Furthermore, stability of the films in aqueous NaOH solution was investigated with quartz crystal microbalance with dissipation monitoring. The films were stable at 0.0001 M NaOH but already 0.001 M NaOH partially dissolved the film. The surprising susceptibility to dissolve in dilute NaOH was hypothetically attributed to the lack of hierarchical morphology in the amorphous film.

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Section: Methodsmentioning

confidence: 99%

Section: ' Introductionmentioning

confidence: 99%

Amorphous Characteristics of an Ultrathin Cellulose Film

et al. 2011

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“…Specular neutron reflectivity experiments were carried out on the time-of-flight reflectometer EROS at the Laboratoire Léon Brillouin, CEA Saclay, France . To access a broad momentum transfer range, data were collected at two different fixed angles, 0.93° and 2°, with a neutron white beam covering wavelengths from 3 to 25 Å.…”

Section: Methodsmentioning

confidence: 99%

Structural Details of Cellulose Nanocrystals/Polyelectrolytes Multilayers Probed by Neutron Reflectivity and AFM

et al. 2008

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Neutron reflectivity measurements and AFM observations were used as complementary techniques to investigate multilayered films consisting of alternating sheets of rigid cellulose nanocrystals and flexible poly(allylamine hydrochloride) (PAH) prepared by the layer-by-layer assembly technique. Both techniques showed that smooth films with a high load of cellulose could be obtained. After deposition, the cellulose component occurred as a double layer with different densities: 50% and 25% for the lower and upper layer, respectively. A linear growth of the multilayer and the presence of a Bragg peak on neutron reflectivity curves indicated the formation of a well-ordered structure resulting from entropy-driven assembly and smoothening effect of the flexible PAH macromolecules. The possible alignment of the nanocrystals when anisotropic suspensions were used is also shown and opens the route to an improved control of the architecture of these multilayers.

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“…Specular neutron reflectivity experiments were carried out on the time-of-flight reflectometer EROS at the Laboratoire Le ´on Brillouin, CEA Saclay, France. 24 To access a broad momentum transfer range, data were collected at two different fixed angles, 0.93°and 2°, with a neutron white beam covering wavelengths from 3 to 25 Å. The final accessible Q-range is 0.008-0.1 Å -1 .…”

Section: Methodsmentioning

confidence: 99%

Non-Electrostatic Building of Biomimetic Cellulose−Xyloglucan Multilayers

et al. 2008

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Layer-by-layer assembly was used to build thin films, consisting of multiple layers alternating cellulose nanocrystals and xyloglucan, benefiting from the strong non-electrostatic cellulose-xyloglucan interaction. Data from atomic force microscopy and neutron reflectivity showed that these well-defined films exhibited a thickness increasing linearly with the number of layers, without increase in surface roughness. These "green" nanocomposite films, reminiscent of plant cell wall, are composed of a regular stack of single layers of cellulose nanocrystals separated by very thin xyloglucan spacers. Such architecture differs from the one formed by cellulose/polycations multilayers, where the cellulose phase itself consists of a double layer.

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Surfaces and interfaces characterization by neutron reflectometry

Cited by 10 publications

References 55 publications

Amorphous Characteristics of an Ultrathin Cellulose Film

Amorphous Characteristics of an Ultrathin Cellulose Film

Structural Details of Cellulose Nanocrystals/Polyelectrolytes Multilayers Probed by Neutron Reflectivity and AFM

Non-Electrostatic Building of Biomimetic Cellulose−Xyloglucan Multilayers

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