User:Andrew Sun/Notebook/LAOS study on physical gelation/2009/05/01

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 * style="background-color: #EEE"|[[Image:owwnotebook_icon.png|128px]] LAOS study on physical gelation
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 * style="background-color: #F2F2F2" align="center"|  |Main project page


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Objectives
Find the critical gel point

Samples
Gels from 5 wt% PAAc solution (Mv=51100): f=1.15e-3, 2.88e-3 (f=[Fe(III)]/[COOH])

Instrument
ARES Rheometer

Frequency Sweep
Frequency sweep of the two samples (Fig. 1) indicate that the critical gel point fgel lies between the f values of the two samples.

FT-Rheology
For both samples, significant signals of the 3rd harmonic were not detected under the strain range swept (50%~700%). Higher strains were not applied.


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