Electrical asymmetrical flow field-flow fractionation: Fundamentals, evolution, applications, and prospects

Area of Science:

• Analytical Chemistry
• Separation Science
• Nanotechnology

Background:

• Electrical Field-Flow Fractionation (ElFFF) faced technical challenges, limiting its application.
• Asymmetrical Flow Field-Flow Fractionation (AF4) is a successful technique in the Field-Flow Fractionation (FFF) family.
• Combining ElFFF principles with AF4 led to the development of Electrical Asymmetrical Flow Field-Flow Fractionation (EAF4).

Purpose of the Study:

• To provide an overview of the novel analytical technique, Electrical Asymmetrical Flow Field-Flow Fractionation (EAF4).
• To summarize the theoretical underpinnings of EAF4.
• To discuss the capabilities and applications of EAF4 in analyzing nano- to micro-scale analytes.

Main Methods:

• EAF4 integrates electrical and asymmetrical flow fields within a single channel for analyte separation.
• The technique leverages the advantages of both ElFFF and AF4 to overcome previous limitations.
• Coupling EAF4 with various detectors allows for the acquisition of multiple data types.

Main Results:

• EAF4 enables the determination of size-resolved electrophoretic mobility, a property not easily accessible by other batch techniques.
• The technique has shown promise in studying biomolecules, nanomaterials, and their interactions.
• Applications span diverse matrices for analytes ranging from the nano to the micro scale.

Conclusions:

• EAF4 represents a significant advancement in separation science, building upon FFF principles.
• The technique offers unique capabilities for characterizing complex samples, particularly in nanotechnology and biochemistry.
• Future trends and current challenges in EAF4 are identified, paving the way for further development.