The Experts below are selected from a list of 86559 Experts worldwide ranked by ideXlab platform
Anthony J Ryan - One of the best experts on this subject based on the ideXlab platform.
-
recent experiments on a small angle wide angle x ray Scattering beam line at the esrf
Journal of Applied Crystallography, 2003Co-Authors: Wim Bras, Anthony J Ryan, I P Dolbnya, Dirk Detollenaere, R Van Tol, M Malfois, G N Greaves, Ellen L HeeleyAbstract:Recent results using a new combined small-angle/Wide-Angle X-Ray Scattering (SAXS/WAXS) beam line at the European Synchrotron Radiation Source (ESRF) will be presented. This beam line is specifically designed to be able to handle complicated sample environments required to perform time-resolved experiments mimicking processing conditions used in material science. Besides the attention that has been given to the interfacing of these sample environments to the beam line data acquisition system also the developments in detector technology will be discussed. The influence that a high count rate and low noise WAXS detector can have on the accuracy of experimental results in polymer crystallisation will be shown. It is shown that it is feasible to detect crystalline volume fractions as low as 10 -3 -10 -4 in polymeric systems.
-
Recent experiments on a small-angle/Wide-Angle X-Ray Scattering beam line at the ESRF
Journal of Applied Crystallography, 2003Co-Authors: Wim Bras, Anthony J Ryan, I P Dolbnya, Dirk Detollenaere, R Van Tol, M Malfois, G N Greaves, Ellen L HeeleyAbstract:Recent results using a new combined small-angle/Wide-Angle X-Ray Scattering (SAXS/WAXS) beam line at the European Synchrotron Radiation Source (ESRF) will be presented. This beam line is specifically designed to be able to handle complicated sample environments required to perform time-resolved experiments mimicking processing conditions used in material science. Besides the attention that has been given to the interfacing of these sample environments to the beam line data acquisition system also the developments in detector technology will be discussed. The influence that a high count rate and low noise WAXS detector can have on the accuracy of experimental results in polymer crystallisation will be shown. It is shown that it is feasible to detect crystalline volume fractions as low as 10 -3 -10 -4 in polymeric systems.
-
time resolved simultaneous small and wide angle x ray Scattering during polyethylene deformation ii cold drawing of linear polyethylene
Polymer, 1998Co-Authors: Michael F Butler, A M Donald, Anthony J RyanAbstract:The cold drawing behaviour of a range of unoriented linear polyethylenes was investigated using the technique of simultaneous small- and Wide-Angle X-Ray Scattering during deformation. The influences of molecular weight and thermal history were studied. The role of both variables was found to be highly important since by altering the percentage crystallinity they influenced the relative amounts of inter- and intra-lamellar deformation. The micromechanical deformation processes governing the different regions of the load-extension curve were found to be the same as for cold-drawn ethylene-α-olefin copolymers, demonstrating the fundamental similarity between all types of unoriented polyethylene PE.
-
Raman spectroscopy combined with small angle X-Ray Scattering and wide angle X-Ray Scattering as a tool for the study of phase transitions in polymers
Review of Scientific Instruments, 1998Co-Authors: G. K. Bryant, Anthony J Ryan, J.p.a. Fairclough, Helen F. Gleeson, D. Bogg, J. G. P. Goossens, Wim BrasAbstract:A novel combination of simultaneous experimental techniques has been developed as a tool for the study of phase transitions in polymers. Based upon a small angle X-Ray Scattering (SAXS) synchrotron radiation beamline it has been shown to be feasible to collect, in addition to the time-resolved SAXS data, wide angle X-Ray Scattering and Raman spectroscopy data with a time resolution of a few seconds.
-
Time resolved simultaneous small- and Wide-Angle X-Ray Scattering during polyethylene deformation 3. Compression of polyethylene
Polymer, 1998Co-Authors: Michael F Butler, Athene M. Donald, Anthony J RyanAbstract:The compression behaviour of a range of unoriented linear and branched polyethylenes was investigated using the technique of simultaneous small- and Wide-Angle X-Ray Scattering during deformation. Interlamellar deformation mechanisms, including simultaneous shear and rotation of lamellar stacks, were followed by crystallographic deformation mechanisms, including (100)[001] chain slip and a martensitic transformation. Immediate post-yield deformation behaviour involved a reconstruction of the lamellar microstructure, the deformation of which was responsible for strain hardening. The reconstruction process, which involved extensive lamellar rearrangement, was aided by the increased amount of amorphous material in the less crystalline linear low density branched polyethylenes. Branch length, however, was found to be unimportant.
Wim Bras - One of the best experts on this subject based on the ideXlab platform.
-
recent experiments on a small angle wide angle x ray Scattering beam line at the esrf
Journal of Applied Crystallography, 2003Co-Authors: Wim Bras, Anthony J Ryan, I P Dolbnya, Dirk Detollenaere, R Van Tol, M Malfois, G N Greaves, Ellen L HeeleyAbstract:Recent results using a new combined small-angle/Wide-Angle X-Ray Scattering (SAXS/WAXS) beam line at the European Synchrotron Radiation Source (ESRF) will be presented. This beam line is specifically designed to be able to handle complicated sample environments required to perform time-resolved experiments mimicking processing conditions used in material science. Besides the attention that has been given to the interfacing of these sample environments to the beam line data acquisition system also the developments in detector technology will be discussed. The influence that a high count rate and low noise WAXS detector can have on the accuracy of experimental results in polymer crystallisation will be shown. It is shown that it is feasible to detect crystalline volume fractions as low as 10 -3 -10 -4 in polymeric systems.
-
Recent experiments on a small-angle/Wide-Angle X-Ray Scattering beam line at the ESRF
Journal of Applied Crystallography, 2003Co-Authors: Wim Bras, Anthony J Ryan, I P Dolbnya, Dirk Detollenaere, R Van Tol, M Malfois, G N Greaves, Ellen L HeeleyAbstract:Recent results using a new combined small-angle/Wide-Angle X-Ray Scattering (SAXS/WAXS) beam line at the European Synchrotron Radiation Source (ESRF) will be presented. This beam line is specifically designed to be able to handle complicated sample environments required to perform time-resolved experiments mimicking processing conditions used in material science. Besides the attention that has been given to the interfacing of these sample environments to the beam line data acquisition system also the developments in detector technology will be discussed. The influence that a high count rate and low noise WAXS detector can have on the accuracy of experimental results in polymer crystallisation will be shown. It is shown that it is feasible to detect crystalline volume fractions as low as 10 -3 -10 -4 in polymeric systems.
-
Raman spectroscopy combined with small angle X-Ray Scattering and wide angle X-Ray Scattering as a tool for the study of phase transitions in polymers
Review of Scientific Instruments, 1998Co-Authors: G. K. Bryant, Anthony J Ryan, J.p.a. Fairclough, Helen F. Gleeson, D. Bogg, J. G. P. Goossens, Wim BrasAbstract:A novel combination of simultaneous experimental techniques has been developed as a tool for the study of phase transitions in polymers. Based upon a small angle X-Ray Scattering (SAXS) synchrotron radiation beamline it has been shown to be feasible to collect, in addition to the time-resolved SAXS data, wide angle X-Ray Scattering and Raman spectroscopy data with a time resolution of a few seconds.
-
Small-angle X-Ray Scattering and Wide-Angle X-Ray Scattering experiments combined with thermal and spectroscopic analysis techniques
Journal of Molecular Structure, 1996Co-Authors: Wim Bras, Anthony J RyanAbstract:Abstract Time resolved simultaneous small-angle X-Ray Scattering (SAXS) and Wide-Angle X-Ray Scattering (WAXS) experiments can provide structural information on the changes in different levels of organisation in a system when it is subjected to a perturbation. These perturbations can be chemical, thermodynamic or physical. However, often there is a desire to gain insights into the mechanism of phase transitions beyond the purely structural information. This can be achieved by combining SAXS and WAXS experiments with thermal analysis or spectroscopic methods. In order to be able to accurately correlate the results from these techniques with the evolution in the structure it is desirable to perform these experiments simultaneously and on the same sample. The higher the time resolution the greater the importance of technique combinations.
-
Simultaneous monitoring of amorphous and crystalline phases in silicalite precursor gels. An in situ hydrothermal and time-resolved small- and Wide-Angle X-Ray Scattering study
Journal of Applied Crystallography, 1994Co-Authors: Wh Wim Dokter, Wim Bras, Tpm Theo Beelen, Van Hf Garderen, Van Ra Rutger Santen, Gareth E. Derbyshire, G.r. MantAbstract:The gel transformations and subsequent crystallization that occur in the precursor reaction mixture of silicalite were investigated using simultaneous small- and Wide-Angle X-Ray Scattering (SAXS–WAXS). The SAXS–WAXS measurements, together with the use of a high flux of synchrotron radiation and a newly developed high-pressure reaction cell, provide the possibility of in situ hydrothermal and time-resolved monitoring of amorphous gel transformations and crystallization.
Theyencheri Narayanan - One of the best experts on this subject based on the ideXlab platform.
-
Combined small‐ and wide‐angle X‐ray Scattering study of early stages of polymer crystallization
Journal of Applied Crystallography, 2003Co-Authors: Pierre Panine, Peter Boesecke, Volker S. Urban, Theyencheri NarayananAbstract:The early stage of melt crystallization in low-density polyethylene was investigated by simultaneous time-resolved small-angle and Wide-Angle X-Ray Scattering (SAXS/WAXS) techniques. The high detectivity of the two-dimensional detectors together with the large photon flux of an undulator source permitted the collection of SAXS and WAXS patterns with nearly single-photon sensitivity and sub-second time resolution. As a result, the crystalline fraction well below 0.001 can be reliably detected and the apparent induction time is considerably reduced (
-
Two-dimensional camera for millisecond range time-resolved small- and Wide-Angle X-Ray Scattering
Journal of Applied Crystallography, 2003Co-Authors: Volker S. Urban, Peter Boesecke, Pierre Panine, C. Ponchut, Theyencheri NarayananAbstract:A combined small-angle and Wide-Angle X-Ray Scattering (SAXS/WAXS) camera has been implemented using area detectors suitable for real time experiments down to millisecond time range. The design is based on the existing high brilliance SAXS camera with a sample-to-detector distance variable from 1 m to 10 m and to which a two-dimensional WAXS detector is coupled. Two independent image intensified CCD detectors allow simultaneous real-time SAXS/WAXS experiments on oriented samples down to the millisecond time range. A wide Scattering vector range spanning from 0.001 A-1 to 6 A-1 is covered by this combined setup. Both detectors have single photon sensitivity and the spatial resolution is about 200 m. The WAXS detector is mounted at an angle inclined to the primary beam and the process of image transformation into non-arbitrary Scattering vector coordinates is demonstrated for a standard p-bromobenzoic acid sample.
Pierre Panine - One of the best experts on this subject based on the ideXlab platform.
-
A microfluidic cell for studying the formation of regenerated silk by synchrotron radiation small- and Wide-Angle X-Ray Scattering
Biomicrofluidics, 2008Co-Authors: Anne Martel, Pierre Panine, Manfred Burghammer, Richard J. Davies, Emanuela Dicola, Jean-baptiste Salmon, Christian RiekelAbstract:A tube-in-square-pipe microfluidic glass cell has been developed for studying the aggregation and fiber formation from regenerated silk solution by in-situ small-angle X-Ray Scattering using synchrotron radiation. Acidification-induced aggregation has been observed close to the mixing point of the fibroin and buffer solution. The fibrous, amorphous material is collected in a water bath. Micro-Wide-Angle X-Ray Scattering of the dried material confirms its β-sheet nature.
-
Combined small‐ and wide‐angle X‐ray Scattering study of early stages of polymer crystallization
Journal of Applied Crystallography, 2003Co-Authors: Pierre Panine, Peter Boesecke, Volker S. Urban, Theyencheri NarayananAbstract:The early stage of melt crystallization in low-density polyethylene was investigated by simultaneous time-resolved small-angle and Wide-Angle X-Ray Scattering (SAXS/WAXS) techniques. The high detectivity of the two-dimensional detectors together with the large photon flux of an undulator source permitted the collection of SAXS and WAXS patterns with nearly single-photon sensitivity and sub-second time resolution. As a result, the crystalline fraction well below 0.001 can be reliably detected and the apparent induction time is considerably reduced (
-
Two-dimensional camera for millisecond range time-resolved small- and Wide-Angle X-Ray Scattering
Journal of Applied Crystallography, 2003Co-Authors: Volker S. Urban, Peter Boesecke, Pierre Panine, C. Ponchut, Theyencheri NarayananAbstract:A combined small-angle and Wide-Angle X-Ray Scattering (SAXS/WAXS) camera has been implemented using area detectors suitable for real time experiments down to millisecond time range. The design is based on the existing high brilliance SAXS camera with a sample-to-detector distance variable from 1 m to 10 m and to which a two-dimensional WAXS detector is coupled. Two independent image intensified CCD detectors allow simultaneous real-time SAXS/WAXS experiments on oriented samples down to the millisecond time range. A wide Scattering vector range spanning from 0.001 A-1 to 6 A-1 is covered by this combined setup. Both detectors have single photon sensitivity and the spatial resolution is about 200 m. The WAXS detector is mounted at an angle inclined to the primary beam and the process of image transformation into non-arbitrary Scattering vector coordinates is demonstrated for a standard p-bromobenzoic acid sample.
Peter Boesecke - One of the best experts on this subject based on the ideXlab platform.
-
Reduction of two-dimensional small- and Wide-Angle X-Ray Scattering data
Journal of Applied Crystallography, 2007Co-Authors: Peter BoeseckeAbstract:At the beamlines ID01 and ID02 of the European Synchrotron Radiation Facility in Grenoble, France, position-sensitive detectors for time-resolved small- and Wide-Angle X-Ray Scattering experiments are in use. The applied data reduction method has never been described comprehensively. This article outlines the parametrization of the raw data and introduces the programs developed for this purpose. Data reduction in the sense of this article means all steps between detector readout and normalization to absolute Scattering intensities. This includes all corrections that can be made without any specific knowledge of the sample, e.g. detector dark-image correction, division by a flat-field and intensity normalization. Processed data are either two- or one-dimensional. Optionally, statistical errors can be propagated through the calculations.
-
Combined small‐ and wide‐angle X‐ray Scattering study of early stages of polymer crystallization
Journal of Applied Crystallography, 2003Co-Authors: Pierre Panine, Peter Boesecke, Volker S. Urban, Theyencheri NarayananAbstract:The early stage of melt crystallization in low-density polyethylene was investigated by simultaneous time-resolved small-angle and Wide-Angle X-Ray Scattering (SAXS/WAXS) techniques. The high detectivity of the two-dimensional detectors together with the large photon flux of an undulator source permitted the collection of SAXS and WAXS patterns with nearly single-photon sensitivity and sub-second time resolution. As a result, the crystalline fraction well below 0.001 can be reliably detected and the apparent induction time is considerably reduced (
-
Two-dimensional camera for millisecond range time-resolved small- and Wide-Angle X-Ray Scattering
Journal of Applied Crystallography, 2003Co-Authors: Volker S. Urban, Peter Boesecke, Pierre Panine, C. Ponchut, Theyencheri NarayananAbstract:A combined small-angle and Wide-Angle X-Ray Scattering (SAXS/WAXS) camera has been implemented using area detectors suitable for real time experiments down to millisecond time range. The design is based on the existing high brilliance SAXS camera with a sample-to-detector distance variable from 1 m to 10 m and to which a two-dimensional WAXS detector is coupled. Two independent image intensified CCD detectors allow simultaneous real-time SAXS/WAXS experiments on oriented samples down to the millisecond time range. A wide Scattering vector range spanning from 0.001 A-1 to 6 A-1 is covered by this combined setup. Both detectors have single photon sensitivity and the spatial resolution is about 200 m. The WAXS detector is mounted at an angle inclined to the primary beam and the process of image transformation into non-arbitrary Scattering vector coordinates is demonstrated for a standard p-bromobenzoic acid sample.
