Characterization of Polyquinoline Blends Using Small Angle Scattering

1989 ◽  
Vol 171 ◽  
Author(s):  
Wen-Li Wu ◽  
John K. Stille ◽  
Joseph W. Tsang ◽  
Alex J. Parker
Keyword(s):  
Small Angle ◽  
Quantitative Information ◽  
Flexible Chain ◽  
X Ray ◽  
Molecular Dispersion ◽  
Angle Scattering ◽  
Scattering Measurements ◽  
Rigid Rod ◽  
Scattering Contribution

ABSTRACTTo determine the compatibility between the rigid rod and the flexible chain polyquinolines, both small angle x-ray and neutron scattering measurements were conducted on blends containing deuterated flexible chains. The scattering intensities from both x-ray and neutron were reduced to their absolute scales in order to remove the scattering contribution from microvoids which tended to overshadow the signal of molecular origin. Quantitative information regarding the molecular dispersion in a 50/50 rigid rod and flexible chain blend was obtained. The result indicated that this material was partially segregated but not to the point of single component phases.

Characterization of Polyquinoline Block Copolymer Using Small Angle Scattering

1988 ◽  
Vol 134 ◽  
Author(s):  
Wen-Li Wu ◽  
John K. Stille ◽  
Joseph W. Tsang ◽  
Alex J. Parker
Keyword(s):  
Block Copolymer ◽  
Small Angle ◽  
Quantitative Information ◽  
Flexible Chain ◽  
X Ray ◽  
Angle Scattering ◽  
Scattering Measurements ◽  
Rigid Rod ◽  
Scattering Contribution

ABSTRACTTo determine the compatibility between the rigid rod and the flexible chain polyquinolines, both small angle x-ray and neutron scattering measurements were conducted on a sample containing deuterated flexible components. The scattering intensities from both x-ray and neutron were reduced to absolute scale in order to remove the scattering contribution from microvoids which tended to overshadow the signal of molecular origin. Quantitative information regarding the extent of molecular segregation in a polyquinoline multi-block copolymer was obtained, the result indicated that the material was strongly associated but not segregated into single component phases.

Dimensions de micelles mixtes de p-alkylbenzènesulfonates par diffusion central des rayons X

1977 ◽  
Vol 10 (1) ◽  
pp. 37-44 ◽  
Author(s):  
C. Cabos ◽  
P. Delord ◽  
J. Rouviere
Keyword(s):  
Small Angle ◽  
Small Angle Scattering ◽  
Micellar Solutions ◽  
Probable Structure ◽  
X Ray ◽  
Absolute Scale ◽  
Angle Scattering ◽  
Scattering Measurements ◽  
Two Component ◽  
Most Probable Structure

The structure of micellar solutions is determined from X-ray small-angle scattering measurements on an absolute scale. The most probable structure is chosen by comparison with spherical cylindrical and lamellar models. This method is applied to two-component micelles and it is possible to follow the variation of micellar dimensions when the concentration of each component is varying.

scholarly journals Hierarchical architecture of spider attachment setae reconstructed from scanning nanofocus X-ray diffraction data

2019 ◽  
Vol 16 (150) ◽  
pp. 20180692 ◽  
Author(s):  
Clemens F. Schaber ◽  
Silja Flenner ◽  
Anja Glisovic ◽  
Igor Krasnov ◽  
Martin Rosenthal ◽  
...  
Keyword(s):  
Small Angle ◽  
Adhesive Contact ◽  
Quantitative Information ◽  
Hair Shaft ◽  
Hierarchical Architecture ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dry Adhesion ◽  
Angle Scattering ◽  
Diffraction Patterns

When sitting and walking, the feet of wandering spiders reversibly attach to many surfaces without the use of gluey secretions. Responsible for the spiders' dry adhesion are the hairy attachment pads that are built of specially shaped cuticular hairs (setae) equipped with approximately 1 µm wide and 20 nm thick plate-like contact elements (spatulae) facing the substrate. Using synchrotron-based scanning nanofocus X-ray diffraction methods, combining wide-angle X-ray diffraction/scattering and small-angle X-ray scattering, allowed substantial quantitative information to be gained about the structure and materials of these fibrous adhesive structures with 200 nm resolution. The fibre diffraction patterns showed the crystalline chitin chains oriented along the long axis of the attachment setae and increased intensity of the chitin signal dorsally within the seta shaft. The small-angle scattering signals clearly indicated an angular shift by approximately 80° of the microtrich structures that branch off the bulk hair shaft and end as the adhesive contact elements in the tip region of the seta. The results reveal the specific structural arrangement and distribution of the chitin fibres within the attachment hair's cuticle preventing material failure by tensile reinforcement and proper distribution of stresses that arise upon attachment and detachment.

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.

scholarly journals Structural Analysis of DDS Nanocarriers by Neutron and X-ray Small-angle Scattering Measurements

hamon ◽  
2020 ◽  
Vol 30 (2) ◽  
pp. 102-105
Author(s):  
Tomoki Nishimura ◽  
Kazunari Akiyoshi ◽  
Yurina Sekine
Keyword(s):  
Structural Analysis ◽  
Small Angle ◽  
Small Angle Scattering ◽  
X Ray ◽  
Angle Scattering ◽  
Scattering Measurements

scholarly journals A combined characterization of clusters in naturally aged Al–Cu–(Li, Mg) alloys using small-angle neutron and X-ray scattering and atom probe tomography

2017 ◽  
Vol 50 (6) ◽  
pp. 1725-1734 ◽  
Author(s):  
R. Ivanov ◽  
A. Deschamps ◽  
F. De Geuser
Keyword(s):  
Small Angle ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
X Rays ◽  
Contrast Variation ◽  
X Ray ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Aged State

A new methodology for the characterization of solute clusters leading to compositional fluctuations is presented and discussed. The methodology makes use of contrast variation arising from a combination of small-angle scattering using neutrons and X-rays, and adapts a model for solute correlation to extract the chemistry and length scale of clustered states after quench and after natural ageing. In three subsets of the Al–Cu system, Cu-rich clusters are reported for all cases. The presence of Mg strongly enhances Cu clustering in the naturally aged state and results in more than double the number of clusters in the complex Al–Cu–Li–Mg system. The results are compared with those obtained using atom probe tomography.

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