polyimide coating effective length total length
Figure 3.7 Schematic representation of the location of the detection window in a capillary for CE.
control of the capillary wall can be obtained by coating the silica with "modifiers," which can be physically adsorbed, chemically bound, or simply added to the running buffer (dynamic coating). The most common coatings are polyacrylamide, PEG, cellulose, PVA, amino acids, proteins (a-lactoglobulin), amines, surfactants, arylpentafluoro compounds, poly(vinylpyrrolidinone), and polyethyleneimine. Also, LC stationary phases (C2, C8, Qg) and GC-like capillary columns (PEG, phenylmethyl silicone) have been used.
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