Small Angle Scattering and the Structure and Dynamics of Filled and Unfilled Rubbers

ABSTRACTRandom cross-linking in rubbers produces local variations in the elasticity of the network. These variations, whose characteristic size lies in the range 1-100 nm, are revealed when the rubber is swollen in a low molecular weight solvent, owing to the competition between the osmotic pressure of the solvent and the local elastic constraints, which affects the local polymer concentration. Such concentration fluctuations can be measured by small angle X-ray or neutron scattering (SAXS or SANS) as well as by dynamic light scattering.In filled elastomers, the filler modifies the distribution of the polymer and of the elastic constraints. Swelling these systems in a solvent in which the deuteron/proton ratio can be varied permits the different components in the scattering function of the polymer and of the filler to be separated. Observations on silica particles in a poly(dimethyl siloxane) (PDMS) rubber yield measurements not only of the surface area of the particles but also of the fraction of the surface area occupied by the polymer. Analysis of the dynamic light scattering response of these systems gives confirmation of the validity of the procedure.Coherent X-ray scattering measurements, combined with dynamic light scattering measurements of the filled uncross-linked polymer melts in the absence of solvent reveal that the structural relaxation process that follows an external mechanical perturbation is a diffusioncontrolled process.

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Unraveling Direct Formation of Hierarchical Zeolite Beta by Dynamic Light Scattering, Small Angle X-ray Scattering, and Liquid and Solid-State NMR: Insights at the Supramolecular Level

Chemistry of Materials ◽

10.1021/acs.chemmater.8b00109 ◽

2018 ◽

Vol 30 (8) ◽

pp. 2676-2686 ◽

Cited By ~ 8

Author(s):

Maria Castro ◽

Pit Losch ◽

Woojin Park ◽

Mohamed Haouas ◽

Francis Taulelle ◽

...

Keyword(s):

Light Scattering ◽

Solid State ◽

Dynamic Light Scattering ◽

Small Angle ◽

Solid State Nmr ◽

Zeolite Beta ◽

Hierarchical Zeolite ◽

X Ray ◽

X Ray Scattering ◽

Direct Formation

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Sulfonitric Treatment of Multiwalled Carbon Nanotubes and Their Dispersibility in Water

Materials ◽

10.3390/ma11122442 ◽

2018 ◽

Vol 11 (12) ◽

pp. 2442 ◽

Cited By ~ 5

Author(s):

Hui Liu ◽

Jianfeng Wang ◽

Jiachen Wang ◽

Suping Cui

Keyword(s):

Carbon Nanotubes ◽

Light Scattering ◽

Dynamic Light Scattering ◽

Multiwalled Carbon Nanotubes ◽

Photoelectron Spectroscopy ◽

Oxidation Degree ◽

Multiwalled Carbon ◽

X Ray ◽

Scattering Measurements ◽

Ft Ir

In this study, Multiwalled carbon nanotubes (MWCNTs) were oxidized by a mixture of sulfuric acid and nitric acid (V:V = 3:1) at 70 °C for 1, 2, and 4 h, respectively. The oxidized MWCNTs were characterized by N2 adsorption, Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), thermal gravimetric analysis (TGA), and Raman spectroscopy to determine the oxidation degree. The dispersion of the MWCNTs was investigated by UV-vis-NIR, SEM, and dynamic light scattering measurements. Results show that sulfonitric treatment increased the surface area and total pore volume and reduced the average pore diameter of MWCNTs. The treatment promoted the formation of oxidized species on the surface MWCNTs, as identified by FT-IR, TGA, and X-ray photoelectron spectroscopy measurements, and more oxygen-containing functional groups were generated when treatment time was extended. Moreover, a general relationship between oxidation degree and dispersibility of MWCNTs in water was established. UV-vis-NIR and dynamic light scattering measurements and SEM images revealed that MWCNTs with higher oxidation degree showed better dispersibility in water.

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Sodium dodecyl sulfate (SDS) effect on the thermal stability of oxy-HbGp: Dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) studies

Colloids and Surfaces B Biointerfaces ◽

10.1016/j.colsurfb.2013.06.050 ◽

2013 ◽

Vol 111 ◽

pp. 561-570 ◽

Cited By ~ 9

Author(s):

José Wilson P. Carvalho ◽

Fernanda Rosa Alves ◽

Tatiana Batista ◽

Francisco Adriano O. Carvalho ◽

Patrícia S. Santiago ◽

...

Keyword(s):

Thermal Stability ◽

Light Scattering ◽

Sodium Dodecyl Sulfate ◽

Dynamic Light Scattering ◽

Small Angle ◽

Sodium Dodecyl ◽

X Ray ◽

X Ray Scattering ◽

Dodecyl Sulfate ◽

Thermal Stability Of

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Use of dynamic light scattering and small-angle X-ray scattering to characterize new surfactants in solution conditions for membrane-protein crystallization

Acta Crystallographica Section F Structural Biology Communications ◽

10.1107/s2053230x15009516 ◽

2015 ◽

Vol 71 (7) ◽

pp. 838-846 ◽

Cited By ~ 5

Author(s):

Mohamed Dahani ◽

Laurie-Anne Barret ◽

Simon Raynal ◽

Colette Jungas ◽

Pétra Pernot ◽

...

Keyword(s):

Light Scattering ◽

Dynamic Light Scattering ◽

Membrane Protein ◽

Small Angle ◽

Protein Crystallization ◽

X Ray ◽

X Ray Scattering ◽

Membrane Protein Crystallization ◽

Surfactant Phase ◽

Ray Scattering

The structural and interactive properties of two novel hemifluorinated surfactants, F2H9-β-M and F4H5-β-M, the syntheses of which were based on the structure and hydrophobicity of the well known dodecyl-β-maltoside (DD-β-M), are described. The shape of their micellar assemblies was characterized by small-angle X-ray scattering and their intermicellar interactions in crystallizing conditions were measured by dynamic light scattering. Such information is essential for surfactant phase-diagram determination and membrane-protein crystallization.

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