Ink storage modulus

What is a good storage modulus for a 3D printed sample?

For example, Chen et al. found that the pumpkin puree-based inks with solid-liquid ratio of 1:1.167 had proper storage modulus (∼20000 Pa) (by frequency sweep, Fig. 2P), showing weak gelation, which was conducive to maintain the 3D printed-samples structure (Chen, Zhang, Liu, & Bhandari, 2021).

What is storage modulus & loss modulus?

The storage modulus gives information about the amount of structure present in a material. It represents the energy stored in the elastic structure of the sample. If it is higher than the loss modulus the material can be regarded as mainly elastic, i.e. the phase shift is below 45°.

What are the rheological properties of ink?

The printability has close relationship to the rheological properties of ink. Shear thinning, moderate thixotropy and storage modulus G’ are desired for a satisfactory ink. The zero shear viscosity should be in the range of 200 ∼ 500 Pa.s and the infinite viscosity greater than 0.5 Pa.s. The viscosity of ink varies with shear and temperature.

How does shear stress affect the storage modulus of sylgard184 ink?

The storage modulus increase with increasing SE1700 content in the hybrid ink, and the and for Newtonian fluid pure Sylgard184 ink are constant. Figure 2 (e) shows the characteristic parameter (equation (2)) as a function of shear stress.

Can edible ink form dimensionally stable 3D-printed food structures?

This research found that the edible ink with higher storage moduli and damping factor could form dimensionally stable 3D structures, which may apply in 3D printing to estimate suitable structural heights to ensure the dimensional stability of 3D-printed food structures (Nijdam et al., 2021).

Why do 3D structures have higher storage modulus?

In other words, a 3D structure presenting a higher storage modulus is capable of withstanding higher stress before collapsing than a structure with a lower storage modulus value at a fixed nozzle diameter. Hence, it is possible to stack more layers before the structure breakdown with a higher value of G '.