Page 283 - IJB-9-3

International Journal of Bioprinting 3D-printed thermosensitive hydrogel based microrobots

Figure 1. 3D printing (two-photon polymerization) process of PNAGA microstructures.

Figure 2. (a) Chemical structure of PNAGA-PEGDA. (b) Optical image of PNAGA hydrogel-based cubic microstructures.

Table 1. Recipes of PNAGA thermosensitive hydrogels topography [40,41] . To our knowledge, the swelling and
bending performance of hydrogels under light stimuli
Sample name Recipe are mainly influenced by light conditions, shape/size,
PNAGA-50 NAGA 50 mg; PEDGA 200 μL; P2CK 1 mg; and mechanical properties of the hydrogels [42,43] . The
H O 0.8 mL
2 variation of storage modulus G′ and loss modulus G″ for
PNAGA-100 NAGA 100 mg; PEDGA 200 μL; P2CK 1 mg; PNAGA-200 and PNAGA-300 (Figure S4), as compared
H O 0.8 mL
2 to PNAGA-100, may lead to wider deformation 3D
PNAGA-200 NAGA 200 mg; PEDGA 200 μL; P2CK 1 mg; printing window.
H O 0.8 mL
2
PNAGA-300 NAGA 300 mg; PEDGA 200 μL; P2CK 1 mg; 3.3. Characterization
H O 0.8 mL 3.3.1. FTIR
2
To confirm the structure of PNAGA-100 synthesized by
to the increase in polymer chain density with increasing 3D printing technology via the 2PP method, the micro
NAGA monomer concentration, the degree of expansion infrared spectroscopy of PNAGA-100 was conducted. As
for each layer is different and the interaction between shown in Figure 4, the characteristic peak at 2923 cm
−1
branches is more complex, resulting in a diverse bending is attributed to the symmetric stretching vibrations of

Volume 9 Issue 3 (2023) 275 https://doi.org/10.18063/ijb.709