Correlation of nanostructural parameters and macromechanical behaviour of hyperbranched-modified polypropylene using time-resolved small-angle X-ray scattering measurements

2012 ◽  
Vol 62 (7) ◽  
pp. 1101-1111 ◽  
Author(s):  
Morteza Ganjaee Sari ◽  
Norbert Stribeck ◽  
Siamak Moradian ◽  
Ahmad Zeinolebadi ◽  
Saeed Bastani ◽  
...  
Keyword(s):  
Small Angle ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Measurements ◽  
Ray Scattering

Time-resolved small-angle x-ray scattering measurements of a polymer bicontinuous microemulsion structure factor under shear

2002 ◽  
Vol 66 (4) ◽  
Author(s):  
Franklin E. Caputo ◽  
Wesley R. Burghardt ◽  
Kasiraman Krishnan ◽  
Frank S. Bates ◽  
Timothy P. Lodge
Keyword(s):  
Small Angle ◽  
Structure Factor ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Bicontinuous Microemulsion ◽  
Scattering Measurements ◽  
Ray Scattering

First performance assessment of the small-angle X-ray scattering beamline at ELETTRA

1998 ◽  
Vol 5 (3) ◽  
pp. 506-508 ◽  
Author(s):  
H. Amenitsch ◽  
M. Rappolt ◽  
M. Kriechbaum ◽  
H. Mio ◽  
P. Laggner ◽  
...  
Keyword(s):  
Small Angle ◽  
Wide Angle ◽  
Fibrous Materials ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Scattering Measurements ◽  
Double Focusing ◽  
Ray Scattering

The double-focusing high-flux wiggler beamline dedicated to small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) at ELETTRA has gone into user operation recently. It has been designed specifically for time-resolved studies of non-crystalline and fibrous materials in the submillisecond time scale, and has been optimized for small-angle scattering measurements. An overview of the beamline status and of some representative results, highlighting the performance of the SAXS beamline, are given.

Performance and First Results of the ELETTRA High-Flux Beamline for Small-Angle X-ray Scattering

1997 ◽  
Vol 30 (5) ◽  
pp. 872-876 ◽  
Author(s):  
H. Amenitsch ◽  
S. Bernstorff ◽  
M. Kriechbaum ◽  
D. Lombardo ◽  
H. Mio ◽  
...  
Keyword(s):  
Small Angle ◽  
Small Angle Scattering ◽  
Design Parameters ◽  
High Flux ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Scattering Measurements ◽  
Ray Scattering

A new beamline for small-angle X-ray scattering (SAXS) has recently been constructed and is presently under final commissioning at the 2 GeV storage ring ELETTRA. It has been designed specifically for time-resolved studies of non-crystalline and fibrous materials and has been optimized for small-angle scattering measurements. The beamline operates with a SAXS resolution between 10 and about 1400 Å in d spacing (at 8 keV) and has been optimized with respect to high flux at the sample [of the order of 1013 photons s−1 for 8 keV photons (2 GeV, 400 mA)]. Soon it will be possible to perform simultaneously wide-angle diffraction measurements in the d-spacing range 1.2–8 Å (at 8 keV). In order to allow time-resolved (resolution ~1 ms) small-angle scattering measurements, a high-power 57-pole wiggler is used as the beamline source. From its beam, one of three discrete energies, 5.4, 8 and 16 keV, can be selected with a double-crystal monochromator, which contains three pairs of asymmetrically cut plane Si(111) crystals. Downstream, the beam is focused horizontally and vertically by a toroidal mirror. Commissioning tests of this new SAXS beamline showed that all design parameters have been realized.

In situ Time-Resolved Small-Angle X-ray Scattering Reveals the Formation Kinetics of Polyelectrolyte Complex Micelles

2019 ◽  
Author(s):  
Hao Wu ◽  
Jeffrey Ting ◽  
Siqi Meng ◽  
Matthew Tirrell
Keyword(s):  
Small Angle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Polyelectrolyte Complex ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

We have directly observed the <i>in situ</i> self-assembly kinetics of polyelectrolyte complex (PEC) micelles by synchrotron time-resolved small-angle X-ray scattering, equipped with a stopped-flow device that provides millisecond temporal resolution. This work has elucidated one general kinetic pathway for the process of PEC micelle formation, which provides useful physical insights for increasing our fundamental understanding of complexation and self-assembly dynamics driven by electrostatic interactions that occur on ultrafast timescales.

scholarly journals Osmotic shrinkage of sterically stabilized liposomes as revealed by time-resolved small-angle X-ray scattering

2014 ◽  
Vol 47 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Zoltán Varga ◽  
András Wacha ◽  
Attila Bóta
Keyword(s):  
Form Factor ◽  
Small Angle ◽  
Freeze Fracture ◽  
Initial Step ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Sterically Stabilized Liposomes ◽  
Liposome Size ◽  
Ray Scattering

Time-resolved synchrotron small-angle X-ray scattering (SAXS) was used to study the structural changes during the osmotic shrinkage of a pharmacologically relevant liposomal drug delivery system. Sterically stabilized liposomes (SSLs) with a diameter of 100 nm and composed of hydrogenated soy phosphocholine, cholesterol and distearoyl-phosphoethanolamine-PEG 2000 prepared in a salt-free buffer were mixed with a buffered 0.3 MNaCl solution using a stopped flow apparatus. The changes in the liposome size and the bilayer structure were followed by using SAXS with a time resolution of 20 ms. A linear decrease in liposome size is observed during the first ∼4 s of the osmotic shrinkage, which reveals a water permeability value of 0.215 (15) µm s−1. The change in the size of the liposomes upon the osmotic shrinkage is also confirmed by dynamic light scattering. After this initial step, broad correlation peaks appear on the SAXS curves in theqrange of the bilayer form factor, which indicates the formation of bi- or oligolamellar structures. Freeze-fracture combined with transmission electron microscopy revealed that lens-shaped liposomes are formed during the shrinkage, which account for the appearance of the quasi-Bragg peaks superimposed on the bilayer form factor. On the basis of these observations, it is proposed that the osmotic shrinkage of SSLs is a two-step process: in the initial step, the liposome shrinks in size, while the area/lipid adapts to the decreased surface area, which is then followed by the deformation of the spherical liposomes into lens-shaped vesicles.

Time-resolved isothermal crystallization of absorbable PGA-co-PLA copolymer by synchrotron small-angle X-ray scattering and wide-angle X-ray diffraction

Polymer ◽  
2001 ◽  
Vol 42 (21) ◽  
pp. 8965-8973 ◽  
Author(s):  
Zhi-Gang Wang ◽  
Xuehui Wang ◽  
Benjamin S. Hsiao ◽  
Saša Andjelić ◽  
Dennis Jamiolkowski ◽  
...  
Keyword(s):  
Small Angle ◽  
Isothermal Crystallization ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Small angle x-ray scattering measurements of lithographic patterns with sidewall roughness from vertical standing waves

2007 ◽  
Vol 90 (19) ◽  
pp. 193122 ◽  
Author(s):  
Chengqing Wang ◽  
Ronald L. Jones ◽  
Eric K. Lin ◽  
Wen-Li Wu ◽  
Jim Leu
Keyword(s):  
Small Angle ◽  
Standing Waves ◽  
Sidewall Roughness ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Measurements ◽  
Ray Scattering
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