| Title | An AFM-based dynamics investigation into the size-dependent behavior of PCL nanofibers |
| Authors | Sun, Liang Wang, Jun Han, Ping-Chou |
| Affiliation | Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China Department of Material Science, Fudan University, Shanghai 200433, China Department of Advanced Materials and Nanotechnology, Peking University, Beijing 100871, China |
| Issue Date | 2009 |
| Publisher | gongcheng lixueengineering mechanics |
| Citation | Gongcheng Lixue/Engineering Mechanics.2009,26,(8),228-232. |
| Abstract | This paper presents a dynamic investigation of the polycaprolactone (PCL) nanofibers of diameters in the 100-500 nm range that were fabricated via electrospinning. We conducted AFM-based strength experiments involving a single-strand fiber and found that its elastic modulus exhibits a strong size dependency after its diameter has been reduced past a threshold size. In an attempt to explain this inverse behavior, we developed a strain gradient vibration model and used it to analyze a clamp-clamp nanofiber employed in our experimentation. As a check, our new vibration equation reverts back to the classic Euler-Bernoulli equation when strain gradient effects are neglected. To predict the onset of the inverse size-dependent response, we proposed a material length scale parameter leff and showed that at leff = 78 nm our theoretical predictions for the PCL nanofibers conform reasonably well to the experimental data. |
| URI | http://hdl.handle.net/20.500.11897/407806 |
| ISSN | 10004750 |
| Indexed | EI |
| Appears in Collections: | 待认领 |
