Second Harmonic Generation is used to investigate both planar fused
quartz/water interface and fused quartz colloidal suspension in water for
the first time. The effect of the surface charge of quartz particles and
plate on the surface pH and adsorption of phenol is studied. These results
are then compared to those obtained by conventional analytical chemistry
methods. The intensities of Second Harmonic Generation from quartz colloids
of different sizes are also observed and evaluated.