Reflectivity of Liquid Surfaces and Interfaces

Daillant, Jean

doi:10.1007/3-540-48696-8_9

Cited by 68 publications

(94 citation statements)

References 32 publications

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“…n s (z) is the distribution of surface excess ions (decaying to zero away from the surface), and n b is the bulk ionic concentration. E(z) is the electric field at depth z. t(α i ) and D(α i ) are electric field amplitude transmission coefficient at an air/water interface 27,37 and X-ray penetration depth normal to the surface, 38 respectively. For a bare surface solution, the fluorescence intensity, denoted as I b , has a contribution only from the bulk, and this expression is employed to model the fluorescence intensity from the FeCl 3 solution of bare surface.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Interfacial Properties and Iron Binding to Bacterial Proteins That Promote the Growth of Magnetite Nanocrystals: X-ray Reflectivity and Surface Spectroscopy Studies

Wang

et al. 2012

Langmuir

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Surface sensitive X-ray scattering and spectroscopic studies have been conducted to determine structural properties of Mms6, the protein in Magnetospirillum magneticum AMB-1 that is implicated as promoter of magnetite nanocrystals growth. Surface pressure versus molecular area isotherms indicate Mms6 forms stable monolayers at the aqueous/vapor interface that are strongly affected by ionic conditions of the subphase. Analysis of X-ray reflectivity from the monolayers shows that the protein conformation at the interface depends on surface pressure and on the presence of ions in the solutions, in particular of iron ions and its complexes. X-ray fluorescence at grazing angles of incidence from the same monolayers allows quantitative determination of surface bound ions to the protein showing that ferric iron binds to Mms6 at higher densities compared to other ions such as Fe 2+ or La 3+ under similar buffer conditions. ABSTRACT: Surface sensitive X-ray scattering and spectroscopic studies have been conducted to determine structural properties of Mms6, the protein in Magnetospirillum magneticum AMB-1 that is implicated as promoter of magnetite nanocrystals growth. Surface pressure versus molecular area isotherms indicate Mms6 forms stable monolayers at the aqueous/vapor interface that are strongly affected by ionic conditions of the subphase. Analysis of X-ray reflectivity from the monolayers shows that the protein conformation at the interface depends on surface pressure and on the presence of ions in the solutions, in particular of iron ions and its complexes. X-ray fluorescence at grazing angles of incidence from the same monolayers allows quantitative determination of surface bound ions to the protein showing that ferric iron binds to Mms6 at higher densities compared to other ions such as Fe 2+ or La 3+ under similar buffer conditions. Disciplines Biochemical and Biomolecular

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Section: ■ Experimental Detailsmentioning

confidence: 99%

Interfacial Properties and Iron Binding to Bacterial Proteins That Promote the Growth of Magnetite Nanocrystals: X-ray Reflectivity and Surface Spectroscopy Studies

Wang

et al. 2012

Langmuir

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“…Another discernible point observed for DPPS (Figure 4(b)) is the narrow interfacial widths both at the headgroup/tail interface and the air/tail interface; the fitting results give the interfacial width of 3.8 ± 1.1 and 4.0 ± 1.2Å, whereas that of DPPC was 6.7 ± 2.0 and 6.0 ± 1.8Å respectively. On the basis of the fact that DPPS molecules pack more densely as shown in the isotherm, we speculate that the headgroup of DPPS molecule induces tighter molecular packing, which damps the capillary fluctuation effectively [22]. The detailed fitting parameters are listed in Table 1.…”

Section: X-ray Reflectivity Of Phospholipid Monolayers On Pbsmentioning

confidence: 99%

X‐ray reflectivity study of a transcription‐activating factor‐derived peptide penetration into the model phospholipid monolayers

Tae

Yang

Shin

et al. 2007

Journal of Peptide Science

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Abstract:The penetration of a transcription-activating factor (TAT)-derived, cell-penetration peptide onto 1,2-dipalmitoyl-snglycero-3-phosphocholine (DPPC) or 1,2-dipalmitoyl-sn-glycero-3-[phospho-L-serine] (DPPS) monolayer on phosphate-buffered saline subphase was characterized. The surface area at the target pressure increased noticeably by the peptide penetration from the subphase to the phospholipid monolayer, which might suggest a direct penetration of the peptide across the pure phospholipid bilayer membrane. Interestingly, the more significant area increase at 35 mN/m was monitored from DPPC monolayer, contrary to the simple charge interaction: the net neutral DPPC, the net-negative DPPS, and the positive TAT-derived peptides (TDP). X-ray reflectivity measurements as well as the molecular area from π (surface pressure)-A (area) isotherms suggest that the packing density of DPPS at the target pressure is too high to allow the effective penetration of the peptide into the monolayer and the positively charged peptides can be entrapped at the negative electrostatic well of DPPS headgroup layer, leading to the simple adsorption on the DPPS monolayer instead of penetration into it. Thus, more penetration with less adsorption of the peptide is induced by DPPC monolayer than DPPS monolayer.

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“…19) Because the "Q z value of the type-A sample was larger than that of the type-B sample, the thickness of the SiO 2 layer in the type-A sample was determined to be lower than that of the SiO 2 layer in the type-B sample. The critical wave vector for the total external reflection (Q c ), which is defined as Q c = 4(³μ) 1/2 (μ represents the SLD), 20) was observed around Q z = 0.01 (¡…”

Section: Neutron Reflectivity Analysis Of Sio 2 (Phps)/simentioning

confidence: 99%

“…It was concluded that this change in the μ value reflected the change in the density of SiO 2 because no unreacted PHPS molecules remained in the SiO 2 (PHPS) layer. The μ value is defined as μ = μ SiO2 ·N A · i b i /M, 20) where μ SiO2 , N A , b i , and M are the density of SiO 2 , Avogadro's number, the coherent scattering length of the element, and the molecular weight, respectively. Thus, assuming that the dominant component of the SiO 2 (PHPS) layer was SiO 2 , the μ SiO2 values of the SiO 2 (PHPS) layers were estimated to be 1.33 (type-A) and 1.45 (type-B), as shown in Table 1.…”

Section: ¹1mentioning

confidence: 99%

Investigation of structure of a thin SiO<sub>2</sub> layer as an antifouling and corrosion-resistant coating

Akutsu

Niizeki

Nagayama

et al. 2016

J. Ceram. Soc. Japan

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The structures of a SiO 2 layers synthesized using perhydropolysilazane [PHPS, labeled as SiO 2 (PHPS)] on both Si and Fe/Si substrates were studied using Fourier transform infrared spectroscopy (FT-IR) and neutron reflectivity (NR) analysis. The FT-IR results revealed that no unreacted PHPS remained and that the primary component of the SiO 2 (PHPS) layer could be considered to be SiO 2 . The NR analysis suggested that a uniform SiO 2 (PHPS) layer was synthesized on the Si and Fe/Si substrate and that the density of this SiO 2 (PHPS)layer was lower than that of natural SiO 2 . In addition, the density of the SiO 2 (PHPS) layer was altered by varying both the thickness and the type of substrate used. These results indicated that the variation in the density of the SiO 2 (PHPS) layer depended on the efficiency of cross-linking reaction between the silazane oligomers in the PHPS coating.

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Reflectivity of Liquid Surfaces and Interfaces

Cited by 68 publications

References 32 publications

Interfacial Properties and Iron Binding to Bacterial Proteins That Promote the Growth of Magnetite Nanocrystals: X-ray Reflectivity and Surface Spectroscopy Studies

Interfacial Properties and Iron Binding to Bacterial Proteins That Promote the Growth of Magnetite Nanocrystals: X-ray Reflectivity and Surface Spectroscopy Studies

X‐ray reflectivity study of a transcription‐activating factor‐derived peptide penetration into the model phospholipid monolayers

Investigation of structure of a thin SiO<sub>2</sub> layer as an antifouling and corrosion-resistant coating

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