On the possibility of shear-driven chromatography: a theoretical performance analysis

Area of Science:

• Analytical Chemistry
• Separation Science

Background:

• Conventional chromatography relies on pressure-driven flow, leading to limitations imposed by pressure drop.
• Existing methods like gas chromatography (GC), liquid chromatography (LC), and supercritical fluid chromatography (SFC) face inherent pressure constraints.
• Operational flexibility in chromatography can be restricted by the need for high pressures.

Purpose of the Study:

• To introduce and define a novel chromatographic operating principle: shear-driven chromatography (SDC).
• To theoretically establish the height equivalent to a theoretical plate (HETP) for SDC in a rectangular channel.
• To demonstrate the potential for increased analysis speed in various chromatographic techniques using SDC.

Main Methods:

• Development of a theoretical expression for HETP specifically for SDC.
• Application of the SDC principle to conditions relevant to LC, GC, and SFC.
• Mathematical modeling and analysis of flow dynamics in a channel with a flat rectangular cross-section.

Main Results:

• SDC effectively circumvents the pressure-drop limitations inherent in traditional chromatography.
• The derived HETP expression provides a basis for understanding SDC performance.
• Significant gains in analysis speed are predicted for LC, GC, and SFC under SDC conditions.
• Operational flexibility, including phase selection and programming, is maintained.

Conclusions:

• Shear-driven chromatography presents a viable alternative to pressure-driven systems.
• SDC offers a pathway to dramatically faster chromatographic separations.
• This principle holds broad applicability across different chromatographic modes (LC, GC, SFC).