The work described by this thesis is a comparison of pore opening geometry for true surface
microfilters. True surface microfilters can be thought of as very fine sieves, with pore sizes
less than 10 microns. All other types of so-called microfiltration membranes do not rely on
sieving, but obtain their pore retention rating by particle collection mechanisms similar to
depth filters. Particle deposition within such microfilters results in permeate flow rate dechne,
for a fixed pressure filtration, or pressure drop rise, for a fixed rate filtration. The true surface
microfilter pore geometnes considered were circular and slotted, and microfilters with
filtering dimension of less than 10 microns were used.
The slotted pore microfilters are not commercially available and had to be made in the
laboratory as part of this study. The technique used was to plate nickel onto an existing
substrate, thereby reducing the pore dimension until It was within the microfiltration range.
The plating was by electroless nickel solution and not by galvanic means. Significant
development of the electroless platmg technique led ultimately to the successful manufacture
of process scale slotted surface microfilters.....
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.