Gain in flux and flexibility with Xenocs beam delivery system and motorized variable aperture scatterless collimation
November 25, 2013
Prof. Cristiano Luis Pinto de Oliveira
Complex Fluids Group, Sao Paulo University, Brazil
The Complex Fluid Group of the Physics Institute at the University of Sao Paulo in Brazil upgraded its SAXS equipment in December 2012 with a Genix 3D Cu Ultra Low Divergence system coupled with a collimator with two motorized variable aperture scatterless slits.
The system was formally equipped with a standard sealed tube with Cross Goebel mirrors and a three pinhole collimation set-up. After eleven months of uninterrupted use, Professor Cristiano Luis Pinto de Oliveira is very enthusiastic about the upgrade:
“Our upgraded SAXS system is providing very good data. We have recently published an article on the study of lipid membranes (Langmuir 2013, 29, 13717-13722) and submitted a few others on the study of various types of systems, with the data that we collected on it. The gain in flux with the Genix is impressive! We achieved a factor 40 approximately in flux gain on sample when compared to the previous state, which is a remarkable improvement. This brings new perspectives for new types of measurements.
Besides the high flux and stability, the feature that I like the most is the flexibility that the adjustable scatterless slits provide. In other equipments with standard pinholes, in order to change the experiment set-up it is generally also necessary to change the pinholes, which might be very tedious mainly because a full alignment is necessary and also because it demands a considerable amount of time.
With the Xenocs solution, with a simple command you can change the beam size, keeping the full alignment unchanged. We use this unique feature a lot when dealing with samples in small capillaries in order to prevent scattering from the capillary borders. Also, when working with samples that provide diffraction peaks like multilamellar vesicles for example, by narrowing the slits one can decrease the effect of smearing."
The group also bought a Xeuss equipment fully motorized and equipped with a Pilatus 300K detector (Xeuss C HP300-fm model) which is installed at the Complex Fluid Laboratory of the University.
About the Complex Fluids Group at Sao Paulo University
The Complex Fluids Group studies lyotropic and thermotropic liquid crystals, lipids, proteins, surfactants, polymers and soft matter in general,using different experimental techniques: linear and non-linear optics, x-ray scattering and diffraction, static and dynamic light scattering, differential scanning calorimetry,isothermal titration calorimetry, photo-thermal spectroscopy, viscosimetry, etc. The group also develops theoretical tools for analysis and modeling of scattering data.
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Dr. José Leobardo Bañuelos
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