Abstract
We studied the properties of surface waves during the gelation process of tungstic acid and gelatin and silica gel by the time resolved surface wave measurements. The anomaly is clearly shown in the change of the wave number exponent x ( ω∼ k x , the values 1.5 and 1.0 indicate surface tension and elastic wave, respectively). x of the tungstic acid was about 1.4 in the sol state and rapidly decreased to 1.0 at the gelation point. x of gelatin was about 1.4 (same as tungstic acid) in the sol state and decreased gradually after the gelation point. On the other hand, x of silica gel remained near 1.5 after the gelation point.
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