Xeuss USAXS performance

December 17, 2013

Prof. Yongfeng Men
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, China

Xenocs installed in January 2013 a Ultra Small Angle X-Ray Scattering (USAXS) equipment at the Changchun Institute of Applied Chemistry in China.

The system which is 10m long allows a Sample to Detector distance of up to 6.5meters, which enables the measurements of samples at very low qmin. This opens the door to analyses of samples having internal structures with characteristic dimensions much higher than 200 nm (500 nm for instance).

Professor Yongfeng Men of Changchun Institute of Applied Chemistry has been analyzing polystyrene spheres with his Xeuss USAXS equipment, and specifically the organization of the spheres among themselves.

Figure1. SAXS pattern of polystyrene spheres with hexagonal close pack organization. Figure 1a (on the left) shows 2D scattering pattern. Figure 1b (on the right) is a 1D representation of scattering pattern obtained by full azimuthal average. Ultimate low q achievable : qmin = 0.01nm-1. Data Courtesy of Professor Men.

Figure 1 shows one example of Professor Men’s experiment on these polystyrene spheres. Distance between first neighbors is 200 nm. The hexagonal organization of the sample can be easily seen on the 2D SAXS pattern (Figure 1a). Thanks to the extremely low qmin of the instrument, the SAXS struture can be perfectly solved (as shown on Figure 1b). Moreover, in such a long sample to detector distance configuration, the Xeuss offers the capability to analyze areas hidden by the beamstop through motorized beamstop removal providing additional resolving power if required.

Professor Yongfeng Men comments enthusiastically on his Xeuss USAXS equipment :

"It is unique! We reach minimum q of about 0.01 nm-1, which has never been achieved with a point lab source. It overwhelms most of the synchrotron based SAXS beamlines in terms of smallest q achievable. Here I should give a five star (top) for the beam delivery, focusing and collimating systems from Xenocs. We have tested various colloidal and polymeric samples. At such a long distance, we are able to perform in situ experiments provided that the electron density contrast is large enough, which is easily fulfilled by many systems we investigated.

Besides, the open sample environment with motor controls is very convenient for in situ measurements with light weighted equipments such as thermal stage covering from liquid nitrogen temperature up to 600°C, tensile stretching device and home made humidity controlled sample cell."

About Changchun Institute of Applied Chemistry, Chinese Academy of Science

Changchun Institute of Applied Chemistry (CIAC) is a multidisciplinary chemical institute involved in research on polymer science, inorganic chemistry, analytical chemistry, organic chemistry, and physical chemistry. The strategic goal of the institute is to build on its current strength in research and development of polymer materials and rare-earth materials, and grow into a top multidisciplinary chemical institute which combines fundamental research, applied research, and technology innovation.

For more information please refer to the Changchun Institute of Applied Chemistry’s website.
Contact : Professor Yongfeng Men [men@ciac.ac.cn]

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