The Static and Dynamic Structure Factor of a Diblock Copolymer Melt via Small-Angle X-ray Scattering and X-ray Photon Correlation Spectroscopy

2013 ◽  
Vol 46 (21) ◽  
pp. 8628-8637 ◽  
Author(s):  
Woo-Sik Jang ◽  
Peter Koo ◽  
Marcin Sykorsky ◽  
Suresh Narayanan ◽  
Alec Sandy ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Small Angle ◽  
Structure Factor ◽  
Photon Correlation Spectroscopy ◽  
Dynamic Structure ◽  
Correlation Spectroscopy ◽  
Dynamic Structure Factor ◽  
Photon Correlation ◽  
X Ray ◽  
X Ray Scattering

Surface Diffusion and Island Growth

2007 ◽  
Vol 263 ◽  
pp. 177-182 ◽  
Author(s):  
Rüdiger Reitinger ◽  
B. Pfau ◽  
L.M. Stadler ◽  
S. Stankov ◽  
M. Zajac ◽  
...  
Keyword(s):  
Small Angle ◽  
Photon Correlation Spectroscopy ◽  
Grazing Incidence ◽  
Correlation Spectroscopy ◽  
Island Growth ◽  
Conducting Surface ◽  
Photon Correlation ◽  
X Ray ◽  
X Ray Scattering ◽  
Coarsening Dynamics

Grazing-Incidence Small Angle X-ray Scattering (GISAXS) and X-Ray Photon Correlation Spectroscopy (XPCS) studies of island growth in two different systems are presented: 5 ML of iron on MgO(001) and 10 ML of iron on Au(001). Due to a missing conducting surface Fe/MgO thinner than approximately 20 ML could not be studied previously by common methods like STM. Fe/Au(001) is interesting as atoms of gold diffuse easily through iron layers and form precipitates. The coarsening dynamics of these precipitates is investigated by XPCS in GISAXS geometry. Their growth depends on the crystallographic directions of the substrate and correlates with the morphology measured by STM microscopy. Measurements were performed at the ESRF in Grenoble.

Rich Dynamics in Diblock Copolymers

2004 ◽  
Vol 856 ◽  
Author(s):  
G. Fytas
Keyword(s):  
Phase Diagram ◽  
Structure Factor ◽  
Diblock Copolymers ◽  
Photon Correlation Spectroscopy ◽  
Dynamic Structure ◽  
High Molecular Mass ◽  
Correlation Spectroscopy ◽  
Dynamic Structure Factor ◽  
Photon Correlation ◽  
Composition Fluctuations

ABSTRACTThe dynamic structure factor S(q, t) of ultra-high molecular mass diblock copolymers BC in a common solvent was systematically investigated by photon correlation spectroscopy in different regimes of the phase diagram. Through proper probing of the composition fluctuations in symmetric and asymmetric BC the different relaxation mechanisms were identified and the influence of the disorder to order (ODT) transition was assessed. In the disordered regime, S(q, t) sensitively depends on the composition polydispersity of BC and the proximity to ODT complementing the real phase morphology of BC. The dynamic response of BC is therefore predictable.

Development of ultra-small-angle X-ray scattering–X-ray photon correlation spectroscopy

2011 ◽  
Vol 44 (1) ◽  
pp. 200-212 ◽  
Author(s):  
F. Zhang ◽  
A. J. Allen ◽  
L. E. Levine ◽  
J. Ilavsky ◽  
G. G. Long ◽  
...  
Keyword(s):  
Small Angle ◽  
Photon Correlation Spectroscopy ◽  
Coherent Scattering ◽  
Correlation Spectroscopy ◽  
Photon Correlation ◽  
X Ray ◽  
Equilibrium Dynamics ◽  
X Ray Scattering ◽  
Non Equilibrium ◽  
Ray Scattering

This paper describes the development of ultra-small-angle X-ray scattering–X-ray photon correlation spectroscopy (USAXS–XPCS). This technique takes advantage of Bonse–Hart crystal optics and is capable of probing the long-time-scale equilibrium and non-equilibrium dynamics of optically opaque materials with prominent features in a scattering vector range between those of dynamic light scattering and conventional XPCS. Instrumental parameters for optimal coherent-scattering operation are described. Two examples are offered to illustrate the applicability and capability of USAXS–XPCS. The first example concerns the equilibrium dynamics of colloidal dispersions of polystyrene microspheres in glycerol at 10, 15 and 20% volume concentrations. The temporal intensity autocorrelation analysis shows that the relaxation time of the microspheres decays monotonically as the scattering vector increases. The second example concerns the non-equilibrium dynamics of a polymer nanocomposite, for which it is demonstrated that USAXS–XPCS can reveal incipient dynamical changes not observable by other techniques.

Sign in / Sign up

Export Citation Format

Share Document