NDLI: Digitally controlled high-precision thermostat for X-ray investigations on lyotropic and thermotropic liquid crystals

Content Provider	Springer Nature Link
Author	Hieke, A. Dörfler, H. D.
Copyright Year	1999
Abstract	The construction of a special hot air generation system for X-ray diffraction investigations of lyotropic and thermotropic mesophases at different temperatures is described. The sample is positioned at the center of the X-ray diffractometer contained in a long cylindrical capillary, and resides at a small goniometer head used to adjust the precise position and inclination of the sample. It was decided to use air as the medium and initially the medium was intended to flow axially. A stream of air is blown from a small and high rectangular opening sideways toward the sample. The gas streaming out of the vessel has to pass through a vortex cell. The air leaving the vortex cell forms a core of whirling gas with constant temperature. A temperature sensor is mounted longitudinally above the sample and is positioned inside the same airflow core. The sensor provides the input signal for a microprocessor-based controller which regulates the power of the heating or cooling system in the inlet tube providing constant temperature in the gas core.
Starting Page	494
Ending Page	498
Page Count	5
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	277
Issue Number	5
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-05-03
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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