Page 128 - Illustrated Pocket Dictionary of Chromatography

MICROPOROUS 127

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Micelle

microbore Columns that have inner diameters (ID) <2mm are
considered microbore columns. The packing material used in these
columns is usually £3mm in diameter. Flow rates are typically
£0.2mL/min (because of the very high backpressure generated in the
system). These systems are especially suited for LC/MS work, limited
sample situations, or separations requiring high peak capacities. From
an operation point of view, as the inner diameter and column length
decrease, the sensitivity of the method increases (less dilution of the
sample) but the difficulty of normal maintenance increases (easy to
damage or contaminate).
microporous Refers to polymerized resins (e.g., polystyrene-
divinylbenzene) that form particles of a size and shape that are
dependent on the rate of polymerization (controlled by concentration,
addition rate, temperature, etc). The result is a porous, pressure-
sensitive, irregularly shaped particle.