Porous materials

Porosity

-increased surface area (BET)

-micro, meso, macro

-DDS, chromatography (filtering agencies)

Porogen

-To create prosity, porogen is utilized as sacrificial agents.

-can be a solvent or polymer (with various MW).

Surface of EDGMA-GMA beads

Toluene

Dodecanol

polystyrene

Porogen

Flory-Huggins Theory

Spinodal decomposition

Internal emulsion

-HIPE (high internal phase emulsion)

-W/O/W, O/W/O systems

HIPE

W/O/W

Solid porogen

-can be a solid (NaCl etc)

-pore size is not controllable.

Precipitation polymerization + Media surface tension control

DVB particles

Acetonitirle/toluene

80/20

Acetonitirle/toluene/dodecanol

70/15/15

Acetonitirle/toluene/cyclohexanol

70/15/15

Seeded polymerization

-self assembly by controlling wettability between particles and solvents

Pickering emulsion methods

-utilize particles as surfactants