A new insight into the mechanical properties of nanobiofibers and vibrational behavior of atomic force microscope beam considering them as the samples

J Mech Behav Biomed Mater. 2023 Apr 5;142:105842. doi: 10.1016/j.jmbbm.2023.105842. Online ahead of print.ABSTRACTNowadays, the utilization and production of polymeric nanofibers are expanding rapidly due to their unique and exclusive properties. The current study examined silk fibroin nanofibers, poly-L lactic acid (PLLA), and polycaprolactone (PCL) as three widely-used biopolymers. In the first section, the mechanical properties of nanobiofibers, including elastic modulus as the first research variable, were investigated using atomic force microscopy (AFM)-based nanoindentation and tensile testing (through a universal testing machine). The results indicated that increasing the concentration of the biopolymer solution increased its elastic modulus. The total amount of elastic modulus for silk fibroin (SF), PCL, and PLLA nanofibers with random and aligned scaffold formats ranged from 1.207 MPa to 3.71 MPa. Based on the molecular weight and concentrations of the solutions, PLLA, PCL, and silk fibroin nanofibers yielded the highest elastic modulus, respectively. In addition, the elastic modulus was greater in an aligned scaffold as opposed to a random format and in retraction as opposed to an extended stroke. During the second section of the study, resonant frequencies as the second research variable and the amplitude of the FRF of the AFM beam's vertical movements using nanobiopolymers with various scaffolds as the samples were investigated theoretically (using the Finite Elem...
Source: Journal of the Mechanical Behavior of Biomedical Materials - Category: Materials Science Authors: Source Type: research