ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
We present the design and performance of a temperature- and pressure-controlled sample cell for the small-angle x-ray diffraction analysis of lyotropic liquid crystalline materials. The particular requirements for such a system of high resolution, high intensity, and control on sample homogeneity can be particularly well fulfilled using line-source diffraction. We thus designed a sample cell that will allow the use of a line source. Sample volume is kept small (20 μl) to keep the contained energy low. The hydrostatic system, based on beryllium x-ray windows, Bridgman type seals with lead O rings and a stainless-steel body is rated to achieve pressure control within ±3 bar between 0 and 3000 bar at ramping rates of 30–100 bar/s. Temperature control is achieved within ±0.03 K between room temperature and 180 °C. Maximum heating rates correspond to 0.8 K/s. Control algorithms are implemented on a Microrobotics K4 controller, using a modest amount of computing power. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1147573
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