0162270 - UIACH-O 20010015 RIV NL eng J - Journal Article
Plocková, Jana - Chmelík, Josef
Different elution modes and field programming in gravitational field-flow fractionation. III. Field programming by flow-rate gradient generated by a programmable pump.
Journal of Chromatography A. Roč. 918, č. 2 (2001), s. 361-370. ISSN 0021-9673. E-ISSN 1873-3778
R&D Projects: GA AV ČR IAA4031805
Institutional research plan: CEZ:AV0Z4031919
Keywords : field-flow fractionation * field programming * flow-rate gradients
Subject RIV: CB - Analytical Chemistry, Separation
Impact factor: 2.793, year: 2001

Gravitational field-flow fractionation (GFFF) utilizes the Earth's gravitational field as an external force that causes the settlement of particles towards the channel accumulation wall. Hydrodynamic lift forces oppose this action by elevating particles away from the channel accumulation wall. These two counteracting forces enable modulation of the resulting force field acting on particles n GFFF. In this work, force-field programming based on modulating the magnitude of hydrodynamic lift forces was implemented via changes of flow-rate, which was accomplished by a programmable pump. Several flow-rate gradients (step gradients, Linear gradients, parabolic, and combined gradients) were tested and evaluated as tools for optimization of the separation of a silica gel particle mixture. The influence of increasing amount of sample injected on the peak resolution under flow-rate gradient conditions was also investigated. This is the first time that flow-rate gradients have been implemented for programming of the resulting force field acting on particles in GFFF
Permanent Link: http://hdl.handle.net/11104/0059589