Dma q800 v20

Small-amplitude compression oscillatory tests were performed to measure the storage modulus E′ and the loss modulus E″ by means of DMA Q800 V20.9 (TA Instruments, New Castle, DE, USA). The strain amplitude was 0.5% and frequency f was between 0.1 and 60 Hz at room temperature (T = 22 °C).
The DMA Q800 V20.9 (TA Instruments, New Castle, DE, USA) was employed to evaluate the storage modulus (E′) and loss modulus (E″) through small-amplitude compression oscillatory tests. These tests involved a strain amplitude of 0.5% and a frequency (f) ranging from 0.1 to 60 Hz, conducted at room temperature (22 °C).
First, the gels immersed in an aqueous solution with pH = 7 were assessed by measuring their storage modulus (E′) and loss modulus (E″). Then, the samples were immersed into an aqueous solution with pH = 2 for 2 days (to reach equilibrium, Figure S1) [14 (link)], and the DMA tests were repeated.

The DMA Q800 V20.9 (TA Instruments, New Castle, DE, USA) was used to measure the storage modulus $E^{\prime }$ and the loss modulus $E^{″}$ in small-amplitude compressive oscillatory tests at temperature T = 22 °C with strain amplitude of 0.5% and frequency f ranged from 0.1 to 60 Hz. The measurements were conducted three times on disc-shape samples with a diameter of 8.5 mm and height of 4.5 mm. The standard deviations of the data did not exceed 5% of their mean values.