Reproducibility and Reliability Working Group

From canSAS
(Difference between revisions)
Jump to: navigation, search
m (Added two references to the Alumina membane, aka Al ceramics, data. I think they are good references to the use of this material.)
m (Edit Al ceramics paragraph.)
 
Line 49: Line 49:
  
 
==Al ceramics masks==
 
==Al ceramics masks==
In 2019, during CanSAS workshop, we (Anna Sokolova and Brian Pauw) have had a discussion on a potential standard for SAXS/SANS measurements.
+
In 2019, during CanSAS workshop, we (Anna Sokolova [https://www.ansto.gov.au/people/dr-anna-sokolova] and Brian Pauw [https://lookingatnothing.com/]) have had a discussion on a potential standard for SAXS/SANS measurements.
  
Al ceramics samples (masks) are purchased from here: [http://www.smartmembranes.de/]
+
Al ceramics samples (masks) have been purchased from Smart membranes [http://www.smartmembranes.de/].
This material (it is also called, Alumina membrane) has been used as an example for the SAXS/USAXS instrument testing, see B. R. Pauw, A. J. Smith, T. Snow, O. Shebanova, J. P. Sutter, J. Ilavsky, D. Hermida-Merino, G. J. Smales, N. J. Terrill, A. F. Thunemann, and W. Bras 'Extending synchrotron SAXS instrument ranges through addition of a portable, inexpensive USAXSmodule with vertical rotation axes'. Journal of Synchrotron Radiation, 28, (2021). doi: 10.1107/S1600577521003313 [https://doi.org/10.1107/S1600577521003313].
+
This material (it is also called 'Alumina membranes') has been used as an example for the SAXS/USAXS instrument testing, see B. R. Pauw, A. J. Smith, T. Snow, O. Shebanova, J. P. Sutter, J. Ilavsky, D. Hermida-Merino, G. J. Smales, N. J. Terrill, A. F. Thunemann, and W. Bras 'Extending synchrotron SAXS instrument ranges through addition of a portable, inexpensive USAXSmodule with vertical rotation axes'. Journal of Synchrotron Radiation, 28, (2021). doi: 10.1107/S1600577521003313 [https://doi.org/10.1107/S1600577521003313].
 
The material was also used in the study by A. Yildirim, K. Sentker, G. J. Smales, B. R. Pauw, P. Huberb, and A. Schonhals 'Collective orientational order and phase behavior of a discotic liquid crystal under nanoscale confinement'. Nanoscale Advances, 1, (2019). doi: 10.1039/c8na00308 [https://doi.org/10.1039/c8na00308d].
 
The material was also used in the study by A. Yildirim, K. Sentker, G. J. Smales, B. R. Pauw, P. Huberb, and A. Schonhals 'Collective orientational order and phase behavior of a discotic liquid crystal under nanoscale confinement'. Nanoscale Advances, 1, (2019). doi: 10.1039/c8na00308 [https://doi.org/10.1039/c8na00308d].
  
Line 58: Line 58:
  
 
SANS data have been collected on Bilby instrument [https://www.ansto.gov.au/our-facilities/australian-centre-for-neutron-scattering/neutron-scattering-instruments/bilby-small], ANSTO, using time-of-flight settings.
 
SANS data have been collected on Bilby instrument [https://www.ansto.gov.au/our-facilities/australian-centre-for-neutron-scattering/neutron-scattering-instruments/bilby-small], ANSTO, using time-of-flight settings.
Unfortunately, it appears that Al Ceramics is not a good material to use because of asymmetry in the membrane and massive multiple scattering, visible even at 4.5A wavelength.
+
Unfortunately, it appears that Al ceramics is not a good material to use because of asymmetry in the membrane and massive multiple scattering, visible even at 4.5A wavelength.
In any way, we found it useful to present the data here, for future reference.
+
In any way, we found it useful to present Bilby data here, for future reference.
  
 
Details and data here : [[ Al Ceramics ]]
 
Details and data here : [[ Al Ceramics ]]

Latest revision as of 02:37, 5 May 2021

Contents

Reliability and Reproducibility

The group considers the issues that relate to reliability of results from small-angle scattering experiments, both as regards measured data and the parameters derived from analysis of the data that describe the samples. It had been established originally under the name 'Standardization' but has been renamed to provide a better description of the activities.

Anybody that is interested is welcome to join the mail group associated with this topic. Past messages are available at: https://groups.google.com/forum/#!forum/cansas-rrwg and there is a button marked 'Apply to join group'.

Members

  • John Barker (NIST)
  • Peter Boesecke (ESRF Contact)
  • Rex Hjelm (LANSCE)
  • Jan Ilavsky (APS)
  • Peter Lindner (ILL)
  • Marc Malfois (Alba)
  • Adrian Rennie (Uppsala University - chair)

News/Status

Discussion_Group_B2

Plans are being made (April 2015) for further types of sample to be circulated for comparative measurements.

  • Discussion at the workshop in Uppsala has been presented on a separate page:

canSAS 2012 meeting discussions

  • Work was presented at the SAS-2012 conference (www.sas2012.com). This includes a summary of standardization in the canSAS session and a presentation on the latex round robin measurements.

canSAS at the SAS-2012 Conference

Glassy Carbon Round Robin

Two samples of glassy carbons from Jan Ilavsky have been doing the rounds. They've been to NIST, ILL, ISIS, APS, ESRF and Diamond and ANSTO.

Details and data here : Glassy Carbon Round Robin

Polystyrene Latex Round Robin

Samples of a monodisperse polystyrene latex have recently been measured at ILL (D22 and D11), ANSTO (Quokka), ISIS (SANS2D) and at NCNR (NG7). Samples are also at Diamond awaiting measurement. Details and data here : Latex Round Robin

A new series of samples designated J, K, L and that have slightly different dilution have been provided for measurements at APS, FRMII, SPRING-8 and ILL.

Results of measurements with some conclusions are described in a publication in Journal of Applied Crystallography:

A. R. Rennie, M. S. Hellsing, K. Wood, E. P. Gilbert, L. Porcar, R. Schweins, C. D. Dewhurst, P. Lindner, R. K. Heenan, S. E. Rogers, P. D. Butler, J. R. Krzywon, R. E. Ghosh, A. J. Jackson and M. Malfois 'Learning about SANS instruments and data reduction from round robin measurements on samples of polystyrene latex', Journal of Applied Crystallography, 46, (2013). doi: 10.1107/S0021889813019468 [1].

Al ceramics masks

In 2019, during CanSAS workshop, we (Anna Sokolova [2] and Brian Pauw [3]) have had a discussion on a potential standard for SAXS/SANS measurements.

Al ceramics samples (masks) have been purchased from Smart membranes [4]. This material (it is also called 'Alumina membranes') has been used as an example for the SAXS/USAXS instrument testing, see B. R. Pauw, A. J. Smith, T. Snow, O. Shebanova, J. P. Sutter, J. Ilavsky, D. Hermida-Merino, G. J. Smales, N. J. Terrill, A. F. Thunemann, and W. Bras 'Extending synchrotron SAXS instrument ranges through addition of a portable, inexpensive USAXSmodule with vertical rotation axes'. Journal of Synchrotron Radiation, 28, (2021). doi: 10.1107/S1600577521003313 [5]. The material was also used in the study by A. Yildirim, K. Sentker, G. J. Smales, B. R. Pauw, P. Huberb, and A. Schonhals 'Collective orientational order and phase behavior of a discotic liquid crystal under nanoscale confinement'. Nanoscale Advances, 1, (2019). doi: 10.1039/c8na00308 [6].

SAXS data have been collected at ... and look promising, showing several peaks.

SANS data have been collected on Bilby instrument [7], ANSTO, using time-of-flight settings. Unfortunately, it appears that Al ceramics is not a good material to use because of asymmetry in the membrane and massive multiple scattering, visible even at 4.5A wavelength. In any way, we found it useful to present Bilby data here, for future reference.

Details and data here : Al Ceramics

Calibration Procedures

We will try to gather summaries of the procedures used for calibration of small-angle scattering instruments. It has been suggested that summaries of information would benefit both users and those who run instruments and facilities. Everyone is encouraged to contribute to this work in progress. Procedures for laboratory instruments as well as synchrotron and neutron facilities are welcome.

Details are here : Calibration Procedures

Personal tools
Namespaces
Variants
Actions
canSAS Meetings
canSAS Working Groups
Navigation
Toolbox